diff --git a/build-tests/ts-command-line-test/.vscode/launch.json b/build-tests/ts-command-line-test/.vscode/launch.json
new file mode 100644
index 0000000000..ac7c0efca9
--- /dev/null
+++ b/build-tests/ts-command-line-test/.vscode/launch.json
@@ -0,0 +1,15 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "node",
+      "request": "launch",
+      "name": "Widget CLI",
+      "program": "${workspaceFolder}/lib/start.js",
+      "args": [ "run", "1", "2", "3" ]
+    }
+  ]
+}
\ No newline at end of file
diff --git a/build-tests/ts-command-line-test/README.md b/build-tests/ts-command-line-test/README.md
new file mode 100644
index 0000000000..c85f938dbd
--- /dev/null
+++ b/build-tests/ts-command-line-test/README.md
@@ -0,0 +1,139 @@
+# ts-command-line-test
+
+This project folder is a minimal code sample illustrating how to make a command-line tool
+using the [@rushstack/ts-command-line](https://www.npmjs.com/package/@rushstack/ts-command-line) library.
+Building this project is one of the CI tests for the library.
+
+## Trying the demo
+
+Compile the project:
+```sh
+# clone the repo
+$ git clone https://github.com/microsoft/rushstack
+$ cd rushstack
+
+# build the code
+$ rush install
+$ rush rebuild
+
+# run the demo using Bash
+$ cd build_tests/ts-command-line-test
+$ ./widget.sh --help
+
+# OR, run the demo using Windows shell
+$ cd build_tests\ts-command-line-test
+$ widget --help
+```
+
+You should see something like this:
+
+```
+usage: widget [-h] [-v] <command> ...
+
+The "widget" tool is a code sample for using the @rushstack/ts-command-line
+library.
+
+Positional arguments:
+  <command>
+    push         Pushes a widget to the service
+    run          This action (hypothetically) passes its command line
+                 arguments to the shell to be executed.
+
+Optional arguments:
+  -h, --help     Show this help message and exit.
+  -v, --verbose  Show extra logging detail
+
+For detailed help about a specific command, use: widget <command> -h
+```
+
+This top-level command line is defined in [WidgetCommandLine.ts](./src/WidgetCommandLine.ts).
+
+## Command line "actions"
+
+Actions are an optional feature of **ts-command-line**.  They work like Git subcommands.
+Our `widget` demo supports two actions, `push` and `run`.  For example, if you type this:
+
+```sh
+$ ./widget.sh push --help
+```
+
+...then you should see specialized help for the "push" action:
+
+```
+usage: widget push [-h] [-f] [--protocol {ftp,webdav,scp}]
+
+Here we provide a longer description of how our action works.
+
+Optional arguments:
+  -h, --help            Show this help message and exit.
+  -f, --force           Push and overwrite any existing state
+  --protocol {ftp,webdav,scp}
+                        Specify the protocol to use. This parameter may
+                        alternatively specified via the WIDGET_PROTOCOL
+                        environment variable. The default value is "scp".
+```
+
+The "push" action is defined in [PushAction.ts](./src/PushAction.ts).
+
+
+The demo prints its command line arguments when you invoke the action:
+
+```sh
+$ ./widget.sh push --protocol webdav --force
+
+Business logic configured the logger: verbose=false
+Received parameters: force=true, protocol="webdav"
+Business logic did the work.
+```
+
+## Some advanced features
+
+The `run` command illustrates a couple other interesting features.  It shows how to
+use `defineCommandLineRemainder()` to capture the remainder of the command line arguments.
+
+```
+usage: widget run [-h] [--title TITLE] ...
+
+This demonstrates how to use the defineCommandLineRemainder() API.
+
+Positional arguments:
+  "..."          The remaining arguments are passed along to the command
+                 shell.
+
+Optional arguments:
+  -h, --help     Show this help message and exit.
+  --title TITLE  An optional title to show in the console window. This
+                 parameter may alternatively specified via the WIDGET_TITLE
+                 environment variable.
+```
+
+The "run" action is defined in [RunAction.ts](./src/RunAction.ts).
+
+Example invocation:
+
+```sh
+$ ./widget.sh run --title "Hello" 1 2 3
+
+Business logic configured the logger: verbose=false
+Console Title: Hello
+Arguments to be executed: ["1","2","3"]
+```
+
+Also, notice that `environmentVariable: 'WIDGET_TITLE'` allows the title to be specified using a
+Bash environment variable:
+
+```sh
+$ export WIDGET_TITLE="Default title"
+$ ./widget.sh run 1 2 3
+
+Business logic configured the logger: verbose=false
+Console Title: Default title
+Arguments to be executed: ["1","2","3"]
+```
+
+For more about environment variables, see the [IBaseCommandLineDefinition.environmentVariable](https://rushstack.io/pages/api/ts-command-line.ibasecommandlinedefinition.environmentvariable/) documentation.
+
+## More information
+
+See [@rushstack/ts-command-line](https://www.npmjs.com/package/@rushstack/ts-command-line) for details.
+
diff --git a/build-tests/ts-command-line-test/build.js b/build-tests/ts-command-line-test/build.js
new file mode 100644
index 0000000000..1de2bf979c
--- /dev/null
+++ b/build-tests/ts-command-line-test/build.js
@@ -0,0 +1,20 @@
+const fsx = require('fs-extra');
+const child_process = require('child_process');
+const path = require('path');
+const process = require('process');
+
+function executeCommand(command) {
+  console.log('---> ' + command);
+  child_process.execSync(command, { stdio: 'inherit' });
+}
+
+// Clean the old build outputs
+console.log(`==> Starting build.js for ${path.basename(process.cwd())}`);
+fsx.emptyDirSync('dist');
+fsx.emptyDirSync('lib');
+fsx.emptyDirSync('temp');
+
+// Run the TypeScript compiler
+executeCommand('node node_modules/typescript/lib/tsc');
+
+console.log(`==> Finished build.js for ${path.basename(process.cwd())}`);
diff --git a/build-tests/ts-command-line-test/package.json b/build-tests/ts-command-line-test/package.json
new file mode 100644
index 0000000000..1c31260b8e
--- /dev/null
+++ b/build-tests/ts-command-line-test/package.json
@@ -0,0 +1,16 @@
+{
+  "name": "ts-command-line-test",
+  "description": "Building this project is a regression test for ts-command-line",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "build": "node build.js",
+    "start": "node ./lib/start.js"
+  },
+  "devDependencies": {
+    "@rushstack/ts-command-line": "4.3.14",
+    "@types/node": "10.17.13",
+    "fs-extra": "~7.0.1",
+    "typescript": "~3.7.2"
+  }
+}
diff --git a/build-tests/ts-command-line-test/src/BusinessLogic.ts b/build-tests/ts-command-line-test/src/BusinessLogic.ts
new file mode 100644
index 0000000000..2607ee8067
--- /dev/null
+++ b/build-tests/ts-command-line-test/src/BusinessLogic.ts
@@ -0,0 +1,13 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+export class BusinessLogic {
+  public static async doTheWork(force: boolean, protocol: string): Promise<void> {
+    console.log(`Received parameters: force=${force}, protocol="${protocol}"`);
+    console.log(`Business logic did the work.`);
+  }
+
+  public static configureLogger(verbose: boolean): void {
+    console.log(`Business logic configured the logger: verbose=${verbose}`);
+  }
+}
diff --git a/build-tests/ts-command-line-test/src/PushAction.ts b/build-tests/ts-command-line-test/src/PushAction.ts
new file mode 100644
index 0000000000..a8ac4ae392
--- /dev/null
+++ b/build-tests/ts-command-line-test/src/PushAction.ts
@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import { CommandLineFlagParameter, CommandLineAction, CommandLineChoiceParameter } from '@rushstack/ts-command-line';
+import { BusinessLogic } from './BusinessLogic';
+
+export class PushAction extends CommandLineAction {
+  private _force: CommandLineFlagParameter;
+  private _protocol: CommandLineChoiceParameter;
+
+  public constructor() {
+    super({
+      actionName: 'push',
+      summary: 'Pushes a widget to the service',
+      documentation: 'Here we provide a longer description of how our action works.'
+    });
+  }
+
+  protected onExecute(): Promise<void> { // abstract
+    return BusinessLogic.doTheWork(this._force.value, this._protocol.value || "(none)");
+  }
+
+  protected onDefineParameters(): void { // abstract
+    this._force = this.defineFlagParameter({
+      parameterLongName: '--force',
+      parameterShortName: '-f',
+      description: 'Push and overwrite any existing state'
+    });
+
+    this._protocol = this.defineChoiceParameter({
+      parameterLongName: '--protocol',
+      description: 'Specify the protocol to use',
+      alternatives: ['ftp', 'webdav', 'scp'],
+      environmentVariable: 'WIDGET_PROTOCOL',
+      defaultValue: 'scp'
+    });
+  }
+}
diff --git a/build-tests/ts-command-line-test/src/RunAction.ts b/build-tests/ts-command-line-test/src/RunAction.ts
new file mode 100644
index 0000000000..a4fb5a1ecc
--- /dev/null
+++ b/build-tests/ts-command-line-test/src/RunAction.ts
@@ -0,0 +1,37 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import { CommandLineAction, CommandLineStringParameter } from '@rushstack/ts-command-line';
+
+
+export class RunAction extends CommandLineAction {
+  private _title: CommandLineStringParameter;
+
+  public constructor() {
+    super({
+      actionName: 'run',
+      summary: 'This action (hypothetically) passes its command line arguments to the shell to be executed.',
+      documentation: 'This demonstrates how to use the defineCommandLineRemainder() API.'
+    });
+  }
+
+  protected onExecute(): Promise<void> { // abstract
+    console.log(`Console Title: ${this._title.value || '(none)'}`);
+    console.log('Arguments to be executed: ' + JSON.stringify(this.remainder!.values));
+
+    return Promise.resolve();
+  }
+
+  protected onDefineParameters(): void { // abstract
+    this._title = this.defineStringParameter({
+      parameterLongName: '--title',
+      argumentName: 'TITLE',
+      environmentVariable: 'WIDGET_TITLE',
+      description: 'An optional title to show in the console window'
+    });
+
+    this.defineCommandLineRemainder({
+      description: 'The remaining arguments are passed along to the command shell.'
+    });
+  }
+}
diff --git a/build-tests/ts-command-line-test/src/WidgetCommandLine.ts b/build-tests/ts-command-line-test/src/WidgetCommandLine.ts
new file mode 100644
index 0000000000..fc21ea2e22
--- /dev/null
+++ b/build-tests/ts-command-line-test/src/WidgetCommandLine.ts
@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import { CommandLineParser, CommandLineFlagParameter } from '@rushstack/ts-command-line';
+import { PushAction } from './PushAction';
+import { RunAction } from './RunAction';
+import { BusinessLogic } from './BusinessLogic';
+
+export class WidgetCommandLine extends CommandLineParser {
+  private _verbose: CommandLineFlagParameter;
+
+  public constructor() {
+    super({
+      toolFilename: 'widget',
+      toolDescription: 'The "widget" tool is a code sample for using the @rushstack/ts-command-line library.'
+    });
+
+    this.addAction(new PushAction());
+    this.addAction(new RunAction());
+  }
+
+  protected onDefineParameters(): void { // abstract
+    this._verbose = this.defineFlagParameter({
+      parameterLongName: '--verbose',
+      parameterShortName: '-v',
+      description: 'Show extra logging detail'
+    });
+  }
+
+  protected onExecute(): Promise<void> { // override
+    BusinessLogic.configureLogger(this._verbose.value);
+    return super.onExecute();
+  }
+}
\ No newline at end of file
diff --git a/build-tests/ts-command-line-test/src/start.ts b/build-tests/ts-command-line-test/src/start.ts
new file mode 100644
index 0000000000..b914fed926
--- /dev/null
+++ b/build-tests/ts-command-line-test/src/start.ts
@@ -0,0 +1,7 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import { WidgetCommandLine } from './WidgetCommandLine';
+
+const commandLine: WidgetCommandLine = new WidgetCommandLine();
+commandLine.execute();
diff --git a/build-tests/ts-command-line-test/tsconfig.json b/build-tests/ts-command-line-test/tsconfig.json
new file mode 100644
index 0000000000..6b91bd7ea4
--- /dev/null
+++ b/build-tests/ts-command-line-test/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "es6",
+    "forceConsistentCasingInFileNames": true,
+    "module": "commonjs",
+    "declaration": true,
+    "sourceMap": true,
+    "experimentalDecorators": true,
+    "strictNullChecks": true,
+    "types": [
+      "node"
+    ],
+    "lib": [
+      "es5",
+      "scripthost",
+      "es2015.collection",
+      "es2015.promise",
+      "es2015.iterable",
+      "dom"
+    ],
+    "outDir": "lib"
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}
\ No newline at end of file
diff --git a/build-tests/ts-command-line-test/widget.cmd b/build-tests/ts-command-line-test/widget.cmd
new file mode 100644
index 0000000000..413bf5ae5c
--- /dev/null
+++ b/build-tests/ts-command-line-test/widget.cmd
@@ -0,0 +1,2 @@
+@echo off
+node .\lib\start.js %*
diff --git a/build-tests/ts-command-line-test/widget.sh b/build-tests/ts-command-line-test/widget.sh
new file mode 100644
index 0000000000..aab14bc914
--- /dev/null
+++ b/build-tests/ts-command-line-test/widget.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exec node ./lib/start.js "$@"
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-44.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-44.json
new file mode 100644
index 0000000000..612e9c3bd1
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-44.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Add a new feature defineCommandLineRemainder() which allows additional unvalidated CLI arguments, e.g. to pass along to another tool",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-45.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-45.json
new file mode 100644
index 0000000000..3632081d81
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-45.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Fix a bug with environmentVariable mapping for CommandLineFlagParameter",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-46.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-46.json
new file mode 100644
index 0000000000..74790ab735
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-46.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Add the ability for an environment variable to specify multiple values for CommandLineStringListParameter, encoded as a JSON array",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-47.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-47.json
new file mode 100644
index 0000000000..b4cec86c16
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-47.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Use API Extractor to trim internal APIs from the .d.ts rollup",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-48.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-48.json
new file mode 100644
index 0000000000..4aa54e5f19
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-48.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Fix some bugs that prevented a CommandLineParser from being defined without any actions",
+      "type": "minor"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-49.json b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-49.json
new file mode 100644
index 0000000000..dc1b0f0dc6
--- /dev/null
+++ b/common/changes/@rushstack/ts-command-line/octogonz-tsc-improvements_2020-05-14-09-49.json
@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@rushstack/ts-command-line",
+      "comment": "Improve the README.md and API documentation",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@rushstack/ts-command-line",
+  "email": "4673363+octogonz@users.noreply.github.com"
+}
\ No newline at end of file
diff --git a/common/config/rush/nonbrowser-approved-packages.json b/common/config/rush/nonbrowser-approved-packages.json
index c4cb485101..71bd192959 100644
--- a/common/config/rush/nonbrowser-approved-packages.json
+++ b/common/config/rush/nonbrowser-approved-packages.json
@@ -2,6 +2,10 @@
 {
   "$schema": "https://developer.microsoft.com/json-schemas/rush/v5/approved-packages.schema.json",
   "packages": [
+    {
+      "name": "@microsoft/ts-command-line",
+      "allowedCategories": [ "tests" ]
+    },
     {
       "name": "@jest/core",
       "allowedCategories": [ "libraries" ]
@@ -176,7 +180,7 @@
     },
     {
       "name": "@rushstack/ts-command-line",
-      "allowedCategories": [ "libraries" ]
+      "allowedCategories": [ "libraries", "tests" ]
     },
     {
       "name": "@rushstack/typings-generator",
diff --git a/common/config/rush/pnpm-lock.yaml b/common/config/rush/pnpm-lock.yaml
index d422ee7612..df902caee4 100644
--- a/common/config/rush/pnpm-lock.yaml
+++ b/common/config/rush/pnpm-lock.yaml
@@ -74,10 +74,11 @@ dependencies:
   '@rush-temp/set-webpack-public-path-plugin': 'file:projects/set-webpack-public-path-plugin.tgz'
   '@rush-temp/stream-collator': 'file:projects/stream-collator.tgz'
   '@rush-temp/ts-command-line': 'file:projects/ts-command-line.tgz'
+  '@rush-temp/ts-command-line-test': 'file:projects/ts-command-line-test.tgz'
   '@rush-temp/typings-generator': 'file:projects/typings-generator.tgz'
   '@rush-temp/web-library-build': 'file:projects/web-library-build.tgz'
   '@rush-temp/web-library-build-test': 'file:projects/web-library-build-test.tgz'
-  '@types/argparse': 1.0.33
+  '@types/argparse': 1.0.38
   '@types/chai': 3.4.34
   '@types/chalk': 0.4.31
   '@types/clean-css': 4.2.1
@@ -227,16 +228,16 @@ packages:
     dev: false
     resolution:
       integrity: sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==
-  /@babel/core/7.9.0:
+  /@babel/core/7.9.6:
     dependencies:
       '@babel/code-frame': 7.8.3
-      '@babel/generator': 7.9.5
+      '@babel/generator': 7.9.6
       '@babel/helper-module-transforms': 7.9.0
-      '@babel/helpers': 7.9.2
-      '@babel/parser': 7.9.4
+      '@babel/helpers': 7.9.6
+      '@babel/parser': 7.9.6
       '@babel/template': 7.8.6
-      '@babel/traverse': 7.9.5
-      '@babel/types': 7.9.5
+      '@babel/traverse': 7.9.6
+      '@babel/types': 7.9.6
       convert-source-map: 1.7.0
       debug: 4.1.1
       gensync: 1.0.0-beta.1
@@ -249,57 +250,57 @@ packages:
     engines:
       node: '>=6.9.0'
     resolution:
-      integrity: sha512-kWc7L0fw1xwvI0zi8OKVBuxRVefwGOrKSQMvrQ3dW+bIIavBY3/NpXmpjMy7bQnLgwgzWQZ8TlM57YHpHNHz4w==
-  /@babel/generator/7.9.5:
+      integrity: sha512-nD3deLvbsApbHAHttzIssYqgb883yU/d9roe4RZymBCDaZryMJDbptVpEpeQuRh4BJ+SYI8le9YGxKvFEvl1Wg==
+  /@babel/generator/7.9.6:
     dependencies:
-      '@babel/types': 7.9.5
+      '@babel/types': 7.9.6
       jsesc: 2.5.2
       lodash: 4.17.15
       source-map: 0.5.7
     dev: false
     resolution:
-      integrity: sha512-GbNIxVB3ZJe3tLeDm1HSn2AhuD/mVcyLDpgtLXa5tplmWrJdF/elxB56XNqCuD6szyNkDi6wuoKXln3QeBmCHQ==
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       '@istanbuljs/schema': 0.1.2
-      istanbul-lib-instrument: 4.0.1
+      istanbul-lib-instrument: 4.0.3
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-      safe-buffer: 5.2.0
+      safe-buffer: 5.2.1
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-      safe-buffer: 5.2.0
+      safe-buffer: 5.2.1
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@@ -2586,18 +2614,19 @@ packages:
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-  /browserify-sign/4.0.4:
+  /browserify-sign/4.1.0:
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+      bn.js: 5.1.1
       browserify-rsa: 4.0.1
       create-hash: 1.2.0
       create-hmac: 1.1.7
       elliptic: 6.5.2
       inherits: 2.0.4
       parse-asn1: 5.1.5
+      readable-stream: 3.6.0
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     resolution:
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-      electron-to-chromium: 1.3.422
-      node-releases: 1.1.53
+      caniuse-lite: 1.0.30001058
+      electron-to-chromium: 1.3.437
+      node-releases: 1.1.55
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-  /caniuse-lite/1.0.30001048:
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@@ -2873,7 +2902,7 @@ packages:
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     dev: false
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   /chokidar/3.3.1:
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   /chrome-trace-event/1.0.2:
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-      tslib: 1.11.1
+      tslib: 1.13.0
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@@ -2915,7 +2944,7 @@ packages:
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-      safe-buffer: 5.2.0
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-      safe-buffer: 5.2.0
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     dependencies:
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-      browserify-sign: 4.0.4
+      browserify-sign: 4.1.0
       create-ecdh: 4.0.3
       create-hash: 1.2.0
       create-hmac: 1.1.7
@@ -3421,14 +3450,14 @@ packages:
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-  /cssstyle/2.2.0:
+  /cssstyle/2.3.0:
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     dev: false
     engines:
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-      safe-buffer: 5.2.0
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@@ -3804,7 +3833,7 @@ packages:
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     dependencies:
       domelementtype: 2.0.1
-      entities: 2.0.0
+      entities: 2.0.2
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@@ -3893,10 +3922,10 @@ packages:
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-  /electron-to-chromium/1.3.422:
+  /electron-to-chromium/1.3.437:
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     resolution:
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   /elliptic/6.5.2:
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-  /entities/2.0.0:
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-      acorn: 7.1.1
-      acorn-jsx: 5.2.0_acorn@7.1.1
+      acorn: 7.2.0
+      acorn-jsx: 5.2.0_acorn@7.2.0
       eslint-visitor-keys: 1.1.0
     dev: false
     engines:
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-  /eventemitter3/4.0.0:
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     dependencies:
       md5.js: 1.3.5
-      safe-buffer: 5.2.0
+      safe-buffer: 5.2.1
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     resolution:
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+  /foreach/2.0.5:
+    dev: false
+    resolution:
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   /forever-agent/0.6.1:
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   /fs-minipass/2.1.0:
     dependencies:
-      minipass: 3.1.1
+      minipass: 3.1.3
     dev: false
     engines:
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@@ -5037,9 +5070,7 @@ packages:
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-  /fsevents/1.2.12:
-    bundledDependencies:
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+  /fsevents/1.2.13:
     dependencies:
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       nan: 2.14.1
@@ -5052,7 +5083,7 @@ packages:
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   /fsevents/2.1.3:
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     engines:
@@ -5578,7 +5609,7 @@ packages:
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     hasBin: true
     optionalDependencies:
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+      uglify-js: 3.9.3
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-  /hash-base/3.0.4:
+  /hash-base/3.1.0:
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-      safe-buffer: 5.2.0
+      readable-stream: 3.6.0
+      safe-buffer: 5.2.1
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     engines:
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     resolution:
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-      eventemitter3: 4.0.0
+      eventemitter3: 4.0.4
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@@ -6254,6 +6286,13 @@ packages:
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+  /is-docker/2.0.0:
+    dev: false
+    engines:
+      node: '>=8'
+    optional: true
+    resolution:
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+  /is-typed-array/1.1.3:
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+      available-typed-arrays: 1.0.2
+      es-abstract: 1.17.5
+      foreach: 2.0.5
+      has-symbols: 1.0.1
+    dev: false
+    engines:
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-  /is-wsl/2.1.1:
+  /is-wsl/2.2.0:
+    dependencies:
+      is-docker: 2.0.0
     dev: false
     engines:
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     optional: true
     resolution:
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-      '@babel/parser': 7.9.4
-      '@babel/template': 7.8.6
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@@ -6880,7 +6929,7 @@ packages:
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-      '@jest/test-sequencer': 25.5.0
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       jest-environment-node: 25.5.0
       jest-get-type: 25.2.6
-      jest-jasmine2: 25.5.0
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+      jest-resolve: 25.5.1_jest-resolve@25.5.1
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   /jest-diff/22.4.3:
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-  /jest-haste-map/25.5.0:
+  /jest-haste-map/25.5.1:
     dependencies:
       '@jest/types': 25.5.0
+      '@types/graceful-fs': 4.1.3
       anymatch: 3.1.1
       fb-watchman: 2.0.1
       graceful-fs: 4.2.4
@@ -7144,7 +7194,7 @@ packages:
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@@ -14181,7 +14246,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.1-library-test'
     resolution:
-      integrity: sha512-62jlk+ZoHcBDtDNqCAji+GsMoVcQWasjb2og5qC/5LvZ/8nxmV4ekKLD6YN5wZqkb+NzKFvEzHZtQhVzVMf6Pw==
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       tarball: 'file:projects/rush-stack-compiler-3.1-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.1.tgz':
@@ -14197,7 +14262,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.1'
     resolution:
-      integrity: sha512-Z1uZZ7KN+oW4JdvEhUfFWCQ/q/aw0rNdweWpPFRZ94bsgNIBVLxnN/ndJJbCv+PpngUUo2NLjqyMdMaB7hXodw==
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       tarball: 'file:projects/rush-stack-compiler-3.1.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.2-library-test.tgz':
@@ -14207,7 +14272,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.2-library-test'
     resolution:
-      integrity: sha512-U/JaZ/x9W5i2ajcDvcBEA+WbWWsFLUehO49J/wJDgQTwpeoRAFAkBNurG30ANkQsJKslvDXaQrArpgl55YOkkQ==
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       tarball: 'file:projects/rush-stack-compiler-3.2-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.2.tgz':
@@ -14223,7 +14288,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.2'
     resolution:
-      integrity: sha512-nd3LkKZsFtxAscL1VE/Zu67gUucMwHkx3Pftsxkt0hMux4l/B/VqWNLiQfxbA1vk91zXQXslaF5LS2X1i9QuXg==
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       tarball: 'file:projects/rush-stack-compiler-3.2.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.3-library-test.tgz':
@@ -14233,7 +14298,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.3-library-test'
     resolution:
-      integrity: sha512-k9daB27Q5QpmoC80T29ZyYKk6kwJDDIOFWAaKxxQZAwXXJw84KoKXgnIFiojRLPXgULqWoNIMUxDE9YqGgR1qw==
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       tarball: 'file:projects/rush-stack-compiler-3.3-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.3.tgz':
@@ -14249,7 +14314,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.3'
     resolution:
-      integrity: sha512-GTh/BuujaqppKU+ovXWXcwDwHgrp6EWW0AltrxhPzH62qGIzlGmmyr7YQ6bJXePG8ftP35PvlV+7U5LUa6TsUw==
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       tarball: 'file:projects/rush-stack-compiler-3.3.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.4-library-test.tgz':
@@ -14259,7 +14324,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.4-library-test'
     resolution:
-      integrity: sha512-xFLOsfIzyjnFORdxRYeOGwNLVA+9g8HNGgFaoJmDTq9n8Ei/mqC1UEJS4174vX4Vd8DVnY6lW7lJ1eRdvvDyRA==
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       tarball: 'file:projects/rush-stack-compiler-3.4-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.4.tgz':
@@ -14275,7 +14340,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.4'
     resolution:
-      integrity: sha512-3Lbv6WLILhnBqIZMBFdJ2qb3y45t2H3sDNOQlofh99tVRLjRX8nE0JLxXhirydb/Xg3SqF8AjuN6zTGvSv2UWA==
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       tarball: 'file:projects/rush-stack-compiler-3.4.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.5-library-test.tgz':
@@ -14285,7 +14350,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.5-library-test'
     resolution:
-      integrity: sha512-kdbkfwjHzZj1qx2qYu+eXhkD8B6FFoixuP7hZAY57nG05wo9T2oCadnWlD4iUcHY2JZR+roTcXntUXbFf/TCMA==
+      integrity: sha512-j8nx4dEQJ+cHUKIXKApxNxXCITHKq62HCN6wwLEJm76j2k7XWq4tn5tPZ1r+4mGOa7FkDV90LTLDc/QKPMYlRA==
       tarball: 'file:projects/rush-stack-compiler-3.5-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.5.tgz':
@@ -14301,7 +14366,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.5'
     resolution:
-      integrity: sha512-Xm1pjuydLB1GKZ0v4maGlu5WykkTNxcm8P3Lwa7Pkrtslq6Ow6Vfc1Ctt99xgN5BU+lhYeddlziclO3MB4YvZA==
+      integrity: sha512-kGRFRZyv7d5vdmJWSqaEyJCB3zvRTUgO5/Lj1tKbfCFjfzVRRCpCLRJ03Wvbv0MBpK5FyqMtqqLNt953r1udMg==
       tarball: 'file:projects/rush-stack-compiler-3.5.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.6-library-test.tgz':
@@ -14311,7 +14376,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.6-library-test'
     resolution:
-      integrity: sha512-+MEDSSSG0EJaPeuRSp7t9YRuJU0w6ihjmP8Yg/H+dqfOmFygZuihyN8aHoPq9Nk7mFfqeK8WLrrCgZVWpn4Z1w==
+      integrity: sha512-p5gIy7U1p/j94dlgescLQRacSNbIUs6v0t8j9g3pVKMhDJTa0E4Da8aD0aSjeNzpOIOphbOoQ83XhnycOhAUKw==
       tarball: 'file:projects/rush-stack-compiler-3.6-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.6.tgz':
@@ -14327,7 +14392,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.6'
     resolution:
-      integrity: sha512-7Gzu73qlYgCa6TflWdowSphIxQUsVUc/QT+zVx4kQsaZ943IkdxdmhLAv2oVJ2pYk8UIfjGPfAe8E0H9uFJAcw==
+      integrity: sha512-CBDHX8PLKn0aHNEhR+Qp/kgdKHe18zjjFDcRYVmvTWlobrlNjbQoFoIOs9HrUO64jB55+8dkhX4mcv8yNBMDNA==
       tarball: 'file:projects/rush-stack-compiler-3.6.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.7-library-test.tgz':
@@ -14337,7 +14402,7 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.7-library-test'
     resolution:
-      integrity: sha512-oxt85yUsMbmwysrjhgDKQlABlea5CFpu5I1zhFzjGFSWirRrfsXwyYNTKmqFX96zYQqHveuE4zXGZWOZRlyZQg==
+      integrity: sha512-4I+KKmmTEypdtKlE6lR3lPuDs6yvv4hrAtiDMIFMusleXjoiZWoiwGGmRGPgBfmjTQHHLYPU2elJe7VLeoEs1Q==
       tarball: 'file:projects/rush-stack-compiler-3.7-library-test.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-3.7.tgz':
@@ -14353,14 +14418,14 @@ packages:
     dev: false
     name: '@rush-temp/rush-stack-compiler-3.7'
     resolution:
-      integrity: sha512-/jOMQFhXU/LDGwR1ZpCSDGONBwMAiPSF+bnkZZ/lSxGDdnpUVJnfSapMjWjnkRciaYhNY2zXjuNaGQwogGcbfQ==
+      integrity: sha512-MMXO4i4Drl9Ekrhm9txH1W2KTQSj7wUWAFv7t/WrFMrViFzXtHJmTTanP9Ul9D/O58dte0+yIXZwrMI/864LCA==
       tarball: 'file:projects/rush-stack-compiler-3.7.tgz'
     version: 0.0.0
   'file:projects/rush-stack-compiler-shared.tgz':
     dev: false
     name: '@rush-temp/rush-stack-compiler-shared'
     resolution:
-      integrity: sha512-8KfLRm2K7HWMf+rDHlrc6Cbh628QWsVznJyaP1UzvJ6s1TXVfFWcVdj/LB/iUI83CQOhRa2vNcQeMgfXk/25mw==
+      integrity: sha512-3DA+ZdhWSjTNrAVaC6G9AizudJaiO82PoNgCTQ/3PQ4g4J9xx6BrNv+sVPv/4h5ST2WQhdHiY9OW0/2xWDWY/A==
       tarball: 'file:projects/rush-stack-compiler-shared.tgz'
     version: 0.0.0
   'file:projects/rush.tgz':
@@ -14378,7 +14443,7 @@ packages:
     dev: false
     name: '@rush-temp/rush'
     resolution:
-      integrity: sha512-MmgVLG1uXAsHELhVO6qZX/57JqEI7P3U4BuCKCs4n2LE9Gp6FLnON42Nkz5ZJGC+H8B7b5M1rBBpBKVvBtawUw==
+      integrity: sha512-wuP8hWVzKGT9b2BIFnNinpBdr3ynBNdPsjaM/quBP2QTvkBRWPK8cLCFG9x7WIlzlTSc9Dj0pOsa/xgNsBfjLQ==
       tarball: 'file:projects/rush.tgz'
     version: 0.0.0
   'file:projects/rushell.tgz':
@@ -14391,7 +14456,7 @@ packages:
     dev: false
     name: '@rush-temp/rushell'
     resolution:
-      integrity: sha512-Zh/uEnfTGShWZLbEy9Tevw/zoJc8ee+I4+VWa1dvZbMxRHjPbXAsV7FFf9qGojkyQ1e6Ys/S0ugkGpagUJHfdg==
+      integrity: sha512-/HNMu/bKv7n1vOBNyP9J5z+FOi6RzXn1PNlLujEBr/OTbML8tcoiUypw33pBrcbZXOW2ATcPb+S5A0re4NPS3g==
       tarball: 'file:projects/rushell.tgz'
     version: 0.0.0
   'file:projects/set-webpack-public-path-plugin.tgz':
@@ -14410,7 +14475,7 @@ packages:
     dev: false
     name: '@rush-temp/set-webpack-public-path-plugin'
     resolution:
-      integrity: sha512-3f+Rwf1iIoOUbRxDKN6/Nip91wg5y5Zq7Sfr8E4K4/viImq1hiaUXNtivDNz1JOzjaul1Ti1Irb4HmGaPr9UMw==
+      integrity: sha512-4MhdIOeCEaxg6oKu9QfQ3pjOe07wsQHZ7CqLVgQqfS30tQwBEMUoBGTIvA1qzxC6nWgFwDUVY2kfbqWgLJ4FCg==
       tarball: 'file:projects/set-webpack-public-path-plugin.tgz'
     version: 0.0.0
   'file:projects/stream-collator.tgz':
@@ -14425,14 +14490,25 @@ packages:
     dev: false
     name: '@rush-temp/stream-collator'
     resolution:
-      integrity: sha512-bsfTbXH+l0NfQ78HG0hq/zH6c0ZjIkO6LG/xNdgs6AnBQIrMk/LFCcjVATLrpvg720aFrOGMv3VPM9opBIaD3w==
+      integrity: sha512-sY/+uOObJrCYLyR8ASW0pUOdHNmDWvf5vKibV6KKSBQNEc/Dm886bZCZeon3PB/d1pJ12y3zTRnvxMhFmFJWPg==
       tarball: 'file:projects/stream-collator.tgz'
     version: 0.0.0
+  'file:projects/ts-command-line-test.tgz':
+    dependencies:
+      '@types/node': 10.17.13
+      fs-extra: 7.0.1
+      typescript: 3.7.5
+    dev: false
+    name: '@rush-temp/ts-command-line-test'
+    resolution:
+      integrity: sha512-+P9UKbuFfKegAUZE68u+hj5oAGF6Hdam/6heQhJt4eP8g5HTAZ1twKgdmJ7LH2S7pBLqDgWYfQhh2Fi1TgDmSA==
+      tarball: 'file:projects/ts-command-line-test.tgz'
+    version: 0.0.0
   'file:projects/ts-command-line.tgz':
     dependencies:
       '@microsoft/node-library-build': 6.4.10
       '@microsoft/rush-stack-compiler-3.5': 0.4.4
-      '@types/argparse': 1.0.33
+      '@types/argparse': 1.0.38
       '@types/jest': 25.2.1
       '@types/node': 10.17.13
       argparse: 1.0.10
@@ -14441,7 +14517,7 @@ packages:
     dev: false
     name: '@rush-temp/ts-command-line'
     resolution:
-      integrity: sha512-/T+WJRo57XEB7mmFKPIIDz6MA5PolAiLrG5f89nUYWt3w7N7gXhEyXp01g0URbhz+wQqsywhtfSFzewJ1l3lgQ==
+      integrity: sha512-iEB5Zg57Gc3Sy8h1RYKdtq9AwrqMLQ/Mv+dPTANV30XAPIqjrSGtJDDQ3CSk08WPjdgd53sWvn9o82BsSZHtqg==
       tarball: 'file:projects/ts-command-line.tgz'
     version: 0.0.0
   'file:projects/typings-generator.tgz':
@@ -14454,7 +14530,7 @@ packages:
     dev: false
     name: '@rush-temp/typings-generator'
     resolution:
-      integrity: sha512-1YIwqWWhCZAFAKlmJ8rhottPLsPljlj5sACxb0rfrdNmf9vpJgOM13AdhDh7JdJQIPwQ5AL1aW+6kj+o2QkT8Q==
+      integrity: sha512-zynEIFyxhhEwlFOyIvfizg3JQdUoCix2XKtEeWpJe4oNI/aOhhpRiRNw8TezPLpHUzbKg8zvOIBLD+9QYf2gNg==
       tarball: 'file:projects/typings-generator.tgz'
     version: 0.0.0
   'file:projects/web-library-build-test.tgz':
@@ -14466,7 +14542,7 @@ packages:
     dev: false
     name: '@rush-temp/web-library-build-test'
     resolution:
-      integrity: sha512-KITKza+8eUwx4C5m1s4B4v+EBJHbgNwKQgW+E1KOIalaoo17N2dfV1Zrt03aYzp89a+KXjOKqGDM43cxsOvOhw==
+      integrity: sha512-K4ofDlL/e9IzAcoBBRYLGUl6pRt64YJy2JB1zB/qJwYmazR17sMcKzhMMXnuGa4ejBV4IMbkV2dQrxmpmJXysg==
       tarball: 'file:projects/web-library-build-test.tgz'
     version: 0.0.0
   'file:projects/web-library-build.tgz':
@@ -14478,7 +14554,7 @@ packages:
     dev: false
     name: '@rush-temp/web-library-build'
     resolution:
-      integrity: sha512-HrHXxtTKKxrnzvKf5cWg/jOIq2zAqTgDjxZ6Cr5PXLywLf3ps07eKy4P7BgwjSoA+bwQS2JeH6Gejh9apP27fg==
+      integrity: sha512-Cb6Twy2fWmpyHQXakYyg4DrQFFMr6UTMCPizlamZF8nwczDn1biTxk+qIjVLjxs0Q2/0l70VhZJj3cSI/19WuA==
       tarball: 'file:projects/web-library-build.tgz'
     version: 0.0.0
 registry: ''
@@ -14558,10 +14634,11 @@ specifiers:
   '@rush-temp/set-webpack-public-path-plugin': 'file:./projects/set-webpack-public-path-plugin.tgz'
   '@rush-temp/stream-collator': 'file:./projects/stream-collator.tgz'
   '@rush-temp/ts-command-line': 'file:./projects/ts-command-line.tgz'
+  '@rush-temp/ts-command-line-test': 'file:./projects/ts-command-line-test.tgz'
   '@rush-temp/typings-generator': 'file:./projects/typings-generator.tgz'
   '@rush-temp/web-library-build': 'file:./projects/web-library-build.tgz'
   '@rush-temp/web-library-build-test': 'file:./projects/web-library-build-test.tgz'
-  '@types/argparse': 1.0.33
+  '@types/argparse': 1.0.38
   '@types/chai': 3.4.34
   '@types/chalk': 0.4.31
   '@types/clean-css': 4.2.1
@@ -14703,4 +14780,4 @@ specifiers:
   xmldoc: ~1.1.2
   yargs: ~4.6.0
   z-schema: ~3.18.3
-# shrinkwrap hash: 8964abb813549be4416a5e9f51b777f1e811c0b1
+# shrinkwrap hash: a9bb050d045e2e102f8f5c5824ef3e899ca98bd2
diff --git a/common/reviews/api/ts-command-line.api.md b/common/reviews/api/ts-command-line.api.md
index 090c711c46..d07d9de07a 100644
--- a/common/reviews/api/ts-command-line.api.md
+++ b/common/reviews/api/ts-command-line.api.md
@@ -103,6 +103,7 @@ export abstract class CommandLineParameterProvider {
     // @internal
     constructor();
     defineChoiceParameter(definition: ICommandLineChoiceDefinition): CommandLineChoiceParameter;
+    defineCommandLineRemainder(definition: ICommandLineRemainderDefinition): CommandLineRemainder;
     defineFlagParameter(definition: ICommandLineFlagDefinition): CommandLineFlagParameter;
     defineIntegerParameter(definition: ICommandLineIntegerDefinition): CommandLineIntegerParameter;
     defineStringListParameter(definition: ICommandLineStringListDefinition): CommandLineStringListParameter;
@@ -118,6 +119,7 @@ export abstract class CommandLineParameterProvider {
     readonly parameters: ReadonlyArray<CommandLineParameter>;
     // @internal (undocumented)
     protected _processParsedData(data: _ICommandLineParserData): void;
+    readonly remainder: CommandLineRemainder | undefined;
     renderHelpText(): string;
 }
 
@@ -145,6 +147,18 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
     tryGetAction(actionName: string): CommandLineAction | undefined;
 }
 
+// @public
+export class CommandLineRemainder {
+    // @internal
+    constructor(definition: ICommandLineRemainderDefinition);
+    // @override
+    appendToArgList(argList: string[]): void;
+    readonly description: string;
+    // @internal
+    _setValue(data: any): void;
+    readonly values: ReadonlyArray<string>;
+    }
+
 // @public
 export class CommandLineStringListParameter extends CommandLineParameterWithArgument {
     // @internal
@@ -236,6 +250,11 @@ export interface ICommandLineParserOptions {
     toolFilename: string;
 }
 
+// @public
+export interface ICommandLineRemainderDefinition {
+    description: string;
+}
+
 // @public
 export interface ICommandLineStringDefinition extends IBaseCommandLineDefinitionWithArgument {
     defaultValue?: string;
diff --git a/libraries/ts-command-line/README.md b/libraries/ts-command-line/README.md
index 011ae298b7..bee030e054 100644
--- a/libraries/ts-command-line/README.md
+++ b/libraries/ts-command-line/README.md
@@ -1,17 +1,22 @@
 # ts-command-line
 
-This library helps you create professional command-line tools for Node.js. By "professional", we mean:
+This library helps you create professional command-line tools using TypeScript.  By "professional", we mean:
 
-- **no gotchas for users**:  Seems obvious, but try typing "`npm install --save-dex`" instead of "`npm install --save-dev`" sometime.  The command seems to execute successfully, but it doesn't save anything! The misspelled flag was silently ignored.  This lack of rigor plagues many familiar NodeJS tools and can be confusing and frustrating.  For a great user experience, a command line tool should always be strict about its syntax.
+- **no gotchas for users**:  Seems obvious, but try typing "`npm install --save-dex`" instead of "`npm install --save-dev`" sometime.  The command seems to execute successfully, but it doesn't save anything! The misspelled flag was silently ignored. This lack of rigor plagues many familiar Node.js tools and can be confusing and frustrating. For a great user experience, a command line tool should always be strict about its syntax.
 
-- **no gotchas for developers**:  Many command-line libraries store their parsed data in a simple JavaScript hash object.  This is convenient for small projects. But suppose a large project has many different source files that define and read parameters. If you try to read `data['output-dir']` when it wasn't defined, or if you misspell the key name, your tool will silently behave as if the parameter was omitted.  And is `data['max-count']` a string or a number? Hard to tell! We solve this by modeling each parameter kind as a real TypeScript class.
+- **no gotchas for developers**:  Many command-line libraries store their parsed data in a simple JavaScript object. This is convenient for small projects. But suppose a large project has many different source files that define and read parameters. If you try to read `data['output-dir']` when it wasn't defined, or if you misspell the key name, your tool will silently behave as if the parameter was omitted. And is `data['max-count']` a string or a number? Hard to tell! We solve this by modeling each parameter kind as a real TypeScript class.
 
-- **automatic documentation**: Some command-line libraries treat the `--help` docs as someone else's job.  **ts-command-line** requires each every parameter to have a documentation string, and will automatically generate the `--help` docs for you.  If you like to write long paragraphs, no problem -- they will be word-wrapped correctly.   *[golf clap]*
+- **simple by design**:  Making a CLI is similar to making a graphical UI -- some people have a knack for clean and intuitive designs, but your average developer... needs some help.  :-)  Keeping things simple is the best help.  **ts-command-line** intentionally provides a minimalist set of CLI building blocks that encourage simple designs.  If your app has lots of knobs and switches, we recommend NOT to design a complex CLI with hundreds of parameters.  Move those options into a commented config file with a published JSON schema.
 
-- **structure and extensibility**: Instead of a simple function chain, **ts-command-line** provides a  "scaffold" pattern that makes it easy to find and understand the command-line implementation for any tool project.  The scaffold model is generally recommended, but there's also a "dynamic" model if you need it.  See below for examples.
+- **automatic documentation**: Some command-line libraries treat the `--help` docs as someone else's job.  **ts-command-line** requires each every parameter to follow a standardized naming pattern and have a documentation string.  It will automatically generate the `--help` docs for you.  If you like to write long paragraphs, no problem -- they will be word-wrapped correctly. *[golf clap]*
 
-Internally, the implementation is based on [argparse](https://www.npmjs.com/package/argparse) and the Python approach to command-lines.  Compared to other libraries, **ts-command-line** doesn't provide zillions of custom syntaxes and bells and whistles.  Instead it aims to be a simple, consistent, and professional solution for your command-line tool.  Give it a try!
+- **structure and extensibility**: Instead of a simple function chain, **ts-command-line** provides a "scaffold" pattern that makes it easy to find and understand the command-line implementation for any tool project.  The scaffold model is generally recommended, but there's also a "dynamic" model if you need it.  See below for examples.
 
+- **environment variable mappings**: Any CLI parameter can be associated with an environment variable.  If the parameter is not explicitly provided, the value from the environment will be used.  The associated environment variables are automatically documented in the `--help`.
+
+Internally, the implementation is based on [argparse](https://www.npmjs.com/package/argparse) and the Python approach to command-lines.
+
+Compared to other libraries, **ts-command-line** doesn't provide zillions of custom syntaxes and bells and whistles.  Instead it aims to be a simple, consistent, and professional solution for your command-line tool.  Give it a try!
 
 ### Some Terminology
 
@@ -25,13 +30,27 @@ In this example, we can identify the following components:
 
 - The **tool name** in this example is `widget`.  This is the name of your Node.js bin script.
 - The **parameters** are  `--verbose`, `--force`, and `--max-count`.
-- The currently supported **parameter kinds** include: **flag** (i.e. boolean), **integer**, **string**, **choice** (i.e. enums), and **string list**.
 - The value "123" is the **argument** for the `--max-count` integer parameter.  (Flags don't have arguments, because their value is determined by whether the flag was provided or not.)
 - Similar to Git's command-line, the `push` token is called an **action**.  It acts as sub-command with its own unique set of parameters.
 - The `--verbose` flag is a **global parameter** because it precedes the action name.  It affects all actions.
 - The `--force` flag is an **action parameter** because it comes after the action name.  It only applies to that action.
 
 
+### Parameter Kinds
+
+Several different kinds of parameters are supported:
+
+| Parameter Kind | Example | Data Type | Description |
+| --- | --- | --- | --- |
+| flag | `--verbose` | `boolean` | Value is `true` if the flag was specified on the command line, `false` otherwise. |
+| integer | `--max-retry 3` | `int` | The argument is an integer number |
+| string | `--title "Hello, world"` | `string` | The argument is a text string. |
+| choice | `--color red` | `string` | The argument is must be a string from a list of allowed choices (similar to an enum). |
+| string list | `-o file1.txt -o file2.txt` | `string[]` | The argument is a text string. The parameter can be specified multiple times to build a list. |
+
+Other parameter kinds could be implemented if requested.  That said, keeping your CLI grammar simple and systematic makes it easier for users to learn.
+
+
 ## Scaffold Model
 
 If your tool uses the scaffold model, you will create subclasses of two abstract base classes:  `CommandLineParser` for the overall command-line, and `CommandLineAction` for each action.
@@ -45,19 +64,20 @@ widget --verbose push --force
 We could define our subclass for the "`push`" action like this:
 
 ```typescript
-class PushAction extends CommandLineAction {
+export class PushAction extends CommandLineAction {
   private _force: CommandLineFlagParameter;
+  private _protocol: CommandLineChoiceParameter;
 
   public constructor() {
     super({
       actionName: 'push',
       summary: 'Pushes a widget to the service',
-      documentation: 'Your long description goes here.'
+      documentation: 'Here we provide a longer description of how our action works.'
     });
   }
 
   protected onExecute(): Promise<void> { // abstract
-    return BusinessLogic.doTheWork(this._force.value);
+    return BusinessLogic.doTheWork(this._force.value, this._protocol.value || "(none)");
   }
 
   protected onDefineParameters(): void { // abstract
@@ -66,6 +86,14 @@ class PushAction extends CommandLineAction {
       parameterShortName: '-f',
       description: 'Push and overwrite any existing state'
     });
+
+    this._protocol = this.defineChoiceParameter({
+      parameterLongName: '--protocol',
+      description: 'Specify the protocol to use',
+      alternatives: ['ftp', 'webdav', 'scp'],
+      environmentVariable: 'WIDGET_PROTOCOL',
+      defaultValue: 'scp'
+    });
   }
 }
 ```
@@ -73,13 +101,13 @@ class PushAction extends CommandLineAction {
 Then we might define the parser subclass like this:
 
 ```typescript
-class WidgetCommandLine extends CommandLineParser {
+export class WidgetCommandLine extends CommandLineParser {
   private _verbose: CommandLineFlagParameter;
 
   public constructor() {
     super({
       toolFilename: 'widget',
-      toolDescription: 'The widget tool is really great.'
+      toolDescription: 'The "widget" tool is a code sample for using the @rushstack/ts-command-line library.'
     });
 
     this.addAction(new PushAction());
@@ -109,6 +137,11 @@ commandLine.execute();
 
 When we run `widget --verbose push --force`, the `PushAction.onExecute()` method will get invoked and then your business logic takes over.
 
+---
+
+**For a more complete example, take a look at the [ts-command-line-test](https://github.com/microsoft/rushstack/tree/master/build-tests/ts-command-line-test) sample project.**
+
+---
 
 #### Testing out the docs
 
@@ -117,7 +150,8 @@ If you invoke the tool as "`widget --help`", the docs are automatically generate
 ```
 usage: widget [-h] [-v] <command> ...
 
-The widget tool is really great.
+The "widget" tool is a code sample for using the @rushstack/ts-command-line
+library.
 
 Positional arguments:
   <command>
@@ -133,13 +167,17 @@ For detailed help about a specific command, use: widget <command> -h
 For help about the `push` action, the user can type "`widget push --help`", which shows this output:
 
 ```
-usage: widget push [-h] [-f]
+usage: widget push [-h] [-f] [--protocol {ftp,webdav,scp}]
 
-Your long description goes here.
+Here we provide a longer description of how our action works.
 
 Optional arguments:
-  -h, --help   Show this help message and exit.
-  -f, --force  Push and overwrite any existing state
+  -h, --help            Show this help message and exit.
+  -f, --force           Push and overwrite any existing state
+  --protocol {ftp,webdav,scp}
+                        Specify the protocol to use. This parameter may
+                        alternatively specified via the WIDGET_PROTOCOL
+                        environment variable. The default value is "scp".
 ```
 
 ## Dynamic Model
@@ -155,8 +193,9 @@ In this case, you can use the `DynamicCommandLineAction` and `DynamicCommandLine
 // Define the parser
 const commandLineParser: DynamicCommandLineParser = new DynamicCommandLineParser({
   toolFilename: 'widget',
-  toolDescription: 'The widget tool is really great.'
+  toolDescription: 'The "widget" tool is a code sample for using the @rushstack/ts-command-line library.'
 });
+
 commandLineParser.defineFlagParameter({
   parameterLongName: '--verbose',
   parameterShortName: '-v',
@@ -167,8 +206,9 @@ commandLineParser.defineFlagParameter({
 const action: DynamicCommandLineAction = new DynamicCommandLineAction({
   actionName: 'push',
   summary: 'Pushes a widget to the service',
-  documentation: 'More detail about the "push" action'
+  documentation: 'Here we provide a longer description of how our action works.'
 });
+
 commandLineParser.addAction(action);
 
 action.defineFlagParameter({
@@ -177,6 +217,14 @@ action.defineFlagParameter({
   description: 'Push and overwrite any existing state'
 });
 
+action.defineChoiceParameter({
+  parameterLongName: '--protocol',
+  description: 'Specify the protocol to use',
+  alternatives: ['ftp', 'webdav', 'scp'],
+  environmentVariable: 'WIDGET_PROTOCOL',
+  defaultValue: 'scp'
+});
+
 // Parse the command line
 commandLineParser.execute(process.argv).then(() => {
   console.log('The action is: ' + commandLineParser.selectedAction!.actionName);
diff --git a/libraries/ts-command-line/config/api-extractor.json b/libraries/ts-command-line/config/api-extractor.json
index 996e271d3d..7454dd5c1d 100644
--- a/libraries/ts-command-line/config/api-extractor.json
+++ b/libraries/ts-command-line/config/api-extractor.json
@@ -14,6 +14,8 @@
   },
 
   "dtsRollup": {
-    "enabled": true
+    "enabled": true,
+    "untrimmedFilePath": "",
+    "publicTrimmedFilePath": "<projectFolder>/dist/<unscopedPackageName>.d.ts"
   }
 }
diff --git a/libraries/ts-command-line/package.json b/libraries/ts-command-line/package.json
index 6463a9f542..ed1275dfbb 100644
--- a/libraries/ts-command-line/package.json
+++ b/libraries/ts-command-line/package.json
@@ -13,7 +13,7 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@types/argparse": "1.0.33",
+    "@types/argparse": "1.0.38",
     "argparse": "~1.0.9",
     "colors": "~1.2.1"
   },
diff --git a/libraries/ts-command-line/src/CommandLineDefinition.ts b/libraries/ts-command-line/src/CommandLineDefinition.ts
index 8c42a5f6f8..485474f78a 100644
--- a/libraries/ts-command-line/src/CommandLineDefinition.ts
+++ b/libraries/ts-command-line/src/CommandLineDefinition.ts
@@ -18,7 +18,7 @@ export interface IBaseCommandLineDefinition {
   parameterShortName?: string;
 
   /**
-   * Documentation for the flag, that will be shown when invoking the tool with "--help"
+   * Documentation for the parameter that will be shown when invoking the tool with "--help"
    */
   description: string;
 
@@ -31,12 +31,35 @@ export interface IBaseCommandLineDefinition {
    * The name of an environment variable that the parameter value will be read from,
    * if it was omitted from the command-line.  An error will be reported if the
    * environment value cannot be parsed.
+   *
    * @remarks
    * The environment variable name must consist only of upper-case letters, numbers,
    * and underscores. It may not start with a number.
    *
    * This feature cannot be used when {@link IBaseCommandLineDefinition.required} is true,
    * because in that case the environmentVariable would never be used.
+   *
+   * Syntax notes for environment variable values:
+   *
+   * - Choice Parameter: The value must match one of the defined choices,
+   *   otherwise a validation error is reported.
+   *   An empty string causes the environment variable to be ignored.
+   *
+   * - Flag Parameter: The value must be `1` for true, or `0` for false,
+   *   otherwise a validation error is reported.
+   *   An empty string causes the environment variable to be ignored.
+   *
+   * - Integer Parameter: The value must be an integer number,
+   *   otherwise a validation error is reported.
+   *   An empty string causes the environment variable to be ignored.
+   *
+   * - String Parameter: Any value is accepted, including an empty string.
+   *
+   * - String List Parameter: If the string starts with `[` (ignoring whitespace)
+   *   then it will be parsed as a JSON array, whose elements must be strings,
+   *   numbers, or boolean values.
+   *   If the string does not start with `[`, then it behaves like an
+   *   ordinary String Parameter:  Any value is accepted, including an empty string.
    */
   environmentVariable?: string;
 }
@@ -80,16 +103,16 @@ export interface ICommandLineChoiceDefinition extends IBaseCommandLineDefinition
 }
 
 /**
- * For use with CommandLineParser, this interface represents a command line parameter
- * that is a boolean flag.
+ * For use with {@link CommandLineParameterProvider.defineFlagParameter},
+ * this interface defines a command line parameter that is a boolean flag.
  *
  * @public
  */
 export interface ICommandLineFlagDefinition extends IBaseCommandLineDefinition { }
 
 /**
- * For use with CommandLineParser, this interface represents a command line parameter
- * whose argument is an integer value.
+ * For use with {@link CommandLineParameterProvider.defineIntegerParameter},
+ * this interface defines a command line parameter whose argument is an integer value.
  *
  * @public
  */
@@ -101,8 +124,8 @@ export interface ICommandLineIntegerDefinition extends IBaseCommandLineDefinitio
 }
 
 /**
- * For use with CommandLineParser, this interface represents a command line parameter
- * whose argument is a string value.
+ * For use with {@link CommandLineParameterProvider.defineStringParameter},
+ * this interface defines a command line parameter whose argument is a string value.
  *
  * @public
  */
@@ -119,9 +142,24 @@ export interface ICommandLineStringDefinition extends IBaseCommandLineDefinition
 }
 
 /**
- * For use with CommandLineParser, this interface represents a command line parameter
- * whose argument is a list of strings.
+ * For use with {@link CommandLineParameterProvider.defineStringListParameter},
+ * this interface defines a command line parameter whose argument is a single text string.
+ * The parameter can be specified multiple times to build a list.
  *
  * @public
  */
 export interface ICommandLineStringListDefinition extends IBaseCommandLineDefinitionWithArgument { }
+
+/**
+ * For use with {@link CommandLineParameterProvider.defineCommandLineRemainder},
+ * this interface defines a rule that captures any remaining command line arguments after the recognized portion.
+ *
+ * @public
+ */
+export interface ICommandLineRemainderDefinition {
+  /**
+   * Documentation for how the remaining arguments will be used.  This will be shown when invoking
+   * the tool with "--help".
+   */
+  description: string;
+}
diff --git a/libraries/ts-command-line/src/CommandLineParameter.ts b/libraries/ts-command-line/src/CommandLineParameter.ts
index b010812d00..8bf561a525 100644
--- a/libraries/ts-command-line/src/CommandLineParameter.ts
+++ b/libraries/ts-command-line/src/CommandLineParameter.ts
@@ -8,6 +8,7 @@ import {
   ICommandLineStringListDefinition,
   ICommandLineIntegerDefinition,
   ICommandLineChoiceDefinition,
+  ICommandLineRemainderDefinition,
   IBaseCommandLineDefinitionWithArgument
 } from './CommandLineDefinition';
 
@@ -88,6 +89,8 @@ export abstract class CommandLineParameter {
 
     if (this.environmentVariable) {
       if (this.required) {
+        // TODO: This constraint is imposed only because argparse enforces "required" parameters, but
+        // it does not know about ts-command-line environment variable mappings.  We should fix this.
         throw new Error(`An "environmentVariable" cannot be specified for "${this.longName}"`
           + ` because it is a required parameter`);
       }
@@ -321,8 +324,14 @@ export class CommandLineFlagParameter extends CommandLineParameter {
       if (typeof data !== 'boolean') {
         this.reportInvalidData(data);
       }
-      this._value = data;
-      return;
+
+      // If the flag is omitted, then argparse sets the data to "false" instead of "undefined".
+      // This design prevents a syntax such as "--flag=false", probably because argparse prefers "--no-flag".
+      // If we switch to a new CLI parser, we should try to add support for "--flag=false".
+      if (data) {
+        this._value = data;
+        return;
+      }
     }
 
     if (this.environmentVariable !== undefined) {
@@ -582,12 +591,32 @@ export class CommandLineStringListParameter extends CommandLineParameterWithArgu
         // NOTE: If the environment variable is defined as an empty string,
         // here we will accept the empty string as our value.  (For number/flag we don't do that.)
 
-        // In the current implementation, the environment variable for a "string list" can only
-        // store a single item.  If we wanted to allow multiple items (and still have a conventional-seeming
-        // environment), we would ask the caller to provide an appropriate delimiter.  Getting involved
-        // with escaping here seems unwise, since there are so many shell escaping mechanisms that could
-        // potentially confuse the experience.
-        this._values = [ environmentValue ];
+        if (environmentValue.trimLeft()[0] === '[') {
+          // Specifying multiple items in an environment variable is a somewhat rare case.  But environment
+          // variables are actually a pretty reliable way for a tool to avoid shell escaping problems
+          // when spawning another tool.  For this case, we need a reliable way to pass an array of strings
+          // that could contain any character.  For example, if we simply used ";" as the list delimiter,
+          // then what to do if a string contains that character?  We'd need to design an escaping mechanism.
+          // Since JSON is simple and standard and can escape every possible string, it's a better option
+          // than a custom delimiter.
+          try {
+            const parsedJson: unknown = JSON.parse(environmentValue);
+            if (!Array.isArray(parsedJson)
+              || !parsedJson.every(x => typeof x === 'string' || typeof x === "boolean" || typeof x === "number")) {
+              throw new Error(`The ${environmentValue} environment variable value must be a JSON `
+                + ` array containing only strings, numbers, and booleans.`);
+            }
+            this._values = parsedJson.map(x => x.toString());
+          } catch (ex) {
+            throw new Error(`The ${environmentValue} environment variable value looks like a JSON array`
+              + ` but failed to parse: ` + ex.message);
+          }
+        } else {
+          // As a shorthand, a single value may be specified without JSON encoding, as long as it does not
+          // start with the "[" character.
+          this._values = [ environmentValue ];
+        }
+
         return;
       }
     }
@@ -618,3 +647,52 @@ export class CommandLineStringListParameter extends CommandLineParameterWithArgu
     }
   }
 }
+
+/**
+ * The data type returned by {@link CommandLineParameterProvider.defineCommandLineRemainder}.
+ * @public
+ */
+export class CommandLineRemainder {
+  private _values: string[] = [];
+
+  /** {@inheritDoc IBaseCommandLineDefinition.description} */
+  public readonly description: string;
+
+  /** @internal */
+  public constructor(definition: ICommandLineRemainderDefinition) {
+    this.description = definition.description;
+  }
+
+  /**
+   * Returns any remaining command line arguments after the recognized portion
+   * that was parsed from the command line.
+   *
+   * @remarks
+   * The array will be empty if the command-line has not been parsed yet.
+   */
+  public get values(): ReadonlyArray<string> {
+    return this._values;
+  }
+
+  /**
+   * {@inheritDoc CommandLineParameter._setValue}
+   * @internal
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  public _setValue(data: any): void { // abstract
+    if (!Array.isArray(data) || !data.every(x => typeof x === 'string')) {
+      throw new Error(`Unexpected data object for remainder: ` + JSON.stringify(data));
+    }
+
+    this._values.push(...data);
+  }
+
+  /** {@inheritDoc CommandLineParameter.appendToArgList} @override */
+  public appendToArgList(argList: string[]): void {
+    if (this.values.length > 0) {
+      for (const value of this.values) {
+        argList.push(value);
+      }
+    }
+  }
+}
diff --git a/libraries/ts-command-line/src/CommandLineParameterProvider.ts b/libraries/ts-command-line/src/CommandLineParameterProvider.ts
index 89234fcadb..798924728d 100644
--- a/libraries/ts-command-line/src/CommandLineParameterProvider.ts
+++ b/libraries/ts-command-line/src/CommandLineParameterProvider.ts
@@ -7,7 +7,8 @@ import {
   ICommandLineStringDefinition,
   ICommandLineStringListDefinition,
   ICommandLineIntegerDefinition,
-  ICommandLineChoiceDefinition
+  ICommandLineChoiceDefinition,
+  ICommandLineRemainderDefinition
 } from './CommandLineDefinition';
 
 import {
@@ -18,7 +19,8 @@ import {
   CommandLineStringListParameter,
   CommandLineIntegerParameter,
   CommandLineChoiceParameter,
-  CommandLineParameterKind
+  CommandLineParameterKind,
+  CommandLineRemainder
 } from './CommandLineParameter';
 
 /**
@@ -42,6 +44,8 @@ export abstract class CommandLineParameterProvider {
   private _parameters: CommandLineParameter[];
   private _parametersByLongName: Map<string, CommandLineParameter>;
 
+  private _remainder: CommandLineRemainder | undefined;
+
   /** @internal */
   // Third party code should not inherit subclasses or call this constructor
   public constructor() {
@@ -56,12 +60,23 @@ export abstract class CommandLineParameterProvider {
     return this._parameters;
   }
 
+  /**
+   * If {@link CommandLineParameterProvider.defineCommandLineRemainder} was called,
+   * this object captures any remaining command line arguments after the recognized portion.
+   */
+  public get remainder(): CommandLineRemainder | undefined {
+    return this._remainder;
+  }
+
   /**
    * Defines a command-line parameter whose value must be a string from a fixed set of
    * allowable choices (similar to an enum).
    *
    * @remarks
-   * Example:  example-tool --log-level warn
+   * Example of a choice parameter:
+   * ```
+   * example-tool --log-level warn
+   * ```
    */
   public defineChoiceParameter(definition: ICommandLineChoiceDefinition): CommandLineChoiceParameter {
     const parameter: CommandLineChoiceParameter = new CommandLineChoiceParameter(definition);
@@ -83,7 +98,10 @@ export abstract class CommandLineParameterProvider {
    * and false otherwise.
    *
    * @remarks
-   * Example:  example-tool --debug
+   * Example usage of a flag parameter:
+   * ```
+   * example-tool --debug
+   * ```
    */
   public defineFlagParameter(definition: ICommandLineFlagDefinition): CommandLineFlagParameter {
     const parameter: CommandLineFlagParameter = new CommandLineFlagParameter(definition);
@@ -101,10 +119,13 @@ export abstract class CommandLineParameterProvider {
   }
 
   /**
-   * Defines a command-line parameter whose value is an integer.
+   * Defines a command-line parameter whose argument is an integer.
    *
    * @remarks
-   * Example:  example-tool --max-attempts 5
+   * Example usage of an integer parameter:
+   * ```
+   * example-tool --max-attempts 5
+   * ```
    */
   public defineIntegerParameter(definition: ICommandLineIntegerDefinition): CommandLineIntegerParameter {
     const parameter: CommandLineIntegerParameter = new CommandLineIntegerParameter(definition);
@@ -122,10 +143,13 @@ export abstract class CommandLineParameterProvider {
   }
 
   /**
-   * Defines a command-line parameter whose value is a single text string.
+   * Defines a command-line parameter whose argument is a single text string.
    *
    * @remarks
-   * Example:  example-tool --message "Hello, world!"
+   * Example usage of a string parameter:
+   * ```
+   * example-tool --message "Hello, world!"
+   * ```
    */
   public defineStringParameter(definition: ICommandLineStringDefinition): CommandLineStringParameter {
     const parameter: CommandLineStringParameter = new CommandLineStringParameter(definition);
@@ -143,10 +167,14 @@ export abstract class CommandLineParameterProvider {
   }
 
   /**
-   * Defines a command-line parameter whose value is one or more text strings.
+   * Defines a command-line parameter whose argument is a single text string.  The parameter can be
+   * specified multiple times to build a list.
    *
    * @remarks
-   * Example:  example-tool --add file1.txt --add file2.txt --add file3.txt
+   * Example usage of a string list parameter:
+   * ```
+   * example-tool --add file1.txt --add file2.txt --add file3.txt
+   * ```
    */
   public defineStringListParameter(definition: ICommandLineStringListDefinition): CommandLineStringListParameter {
     const parameter: CommandLineStringListParameter = new CommandLineStringListParameter(definition);
@@ -154,6 +182,38 @@ export abstract class CommandLineParameterProvider {
     return parameter;
   }
 
+  /**
+   * Defines a rule that captures any remaining command line arguments after the recognized portion.
+   *
+   * @remarks
+   * This feature is useful for commands that pass their arguments along to an external tool, relying on
+   * that tool to perform validation.  (It could also be used to parse parameters without any validation
+   * or documentation, but that is not recommended.)
+   *
+   * Example of capturing the remainder after an optional flag parameter.
+   * ```
+   * example-tool --my-flag this is the remainder
+   * ```
+   *
+   * In the "--help" documentation, the remainder rule will be represented as "...".
+   */
+  public defineCommandLineRemainder(definition: ICommandLineRemainderDefinition): CommandLineRemainder {
+    if (this._remainder) {
+      throw new Error('defineRemainingArguments() has already been called for this provider');
+    }
+    this._remainder = new CommandLineRemainder(definition);
+
+    const argparseOptions: argparse.ArgumentOptions = {
+      help: this._remainder.description,
+      nargs: argparse.Const.REMAINDER,
+      metavar: '"..."'
+    };
+
+    this._getArgumentParser().addArgument(argparse.Const.REMAINDER, argparseOptions);
+
+    return this._remainder;
+  }
+
   /**
    * Returns the CommandLineStringListParameter with the specified long name.
    * @remarks
@@ -189,6 +249,10 @@ export abstract class CommandLineParameterProvider {
       const value: any = data[parameter._parserKey]; // eslint-disable-line @typescript-eslint/no-explicit-any
       parameter._setValue(value);
     }
+
+    if (this.remainder) {
+      this.remainder._setValue(data[argparse.Const.REMAINDER]);
+    }
   }
 
   private _generateKey(): string {
@@ -210,6 +274,11 @@ export abstract class CommandLineParameterProvider {
   }
 
   private _defineParameter(parameter: CommandLineParameter): void {
+    if (this._remainder) {
+      throw new Error('defineCommandLineRemainder() was already called for this provider;'
+        + ' no further parameters can be defined');
+    }
+
     const names: string[] = [];
     if (parameter.shortName) {
       names.push(parameter.shortName);
diff --git a/libraries/ts-command-line/src/CommandLineParser.ts b/libraries/ts-command-line/src/CommandLineParser.ts
index 3f9bf13aef..70c339514c 100644
--- a/libraries/ts-command-line/src/CommandLineParser.ts
+++ b/libraries/ts-command-line/src/CommandLineParser.ts
@@ -79,7 +79,7 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
   public selectedAction: CommandLineAction | undefined;
 
   private _argumentParser: argparse.ArgumentParser;
-  private _actionsSubParser: argparse.SubParser;
+  private _actionsSubParser: argparse.SubParser | undefined;
   private _options: ICommandLineParserOptions;
   private _actions: CommandLineAction[];
   private _actionsByName: Map<string, CommandLineAction>;
@@ -100,11 +100,6 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
         + ` ${this._options.toolFilename} <command> -h`)
     });
 
-    this._actionsSubParser = this._argumentParser.addSubparsers({
-      metavar: '<command>',
-      dest: 'action'
-    });
-
     this.onDefineParameters();
   }
 
@@ -119,6 +114,13 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
    * Defines a new action that can be used with the CommandLineParser instance.
    */
   public addAction(action: CommandLineAction): void {
+    if (!this._actionsSubParser) {
+      this._actionsSubParser = this._argumentParser.addSubparsers({
+        metavar: '<command>',
+        dest: 'action'
+      });
+    }
+
     action._buildParser(this._actionsSubParser);
     this._actions.push(action);
     this._actionsByName.set(action.actionName, action);
@@ -198,6 +200,9 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
         throw new Error('execute() was already called for this parser instance');
       }
       this._executed = true;
+
+      this._validateDefinitions();
+
       if (!args) {
         // 0=node.exe, 1=script name
         args = process.argv.slice(2);
@@ -217,8 +222,9 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
           break;
         }
       }
-      if (!this.selectedAction) {
-        throw new Error('Unrecognized action');
+      if (this.actions.length > 0 && !this.selectedAction) {
+        const actions: string[] = this.actions.map(x => x.actionName);
+        throw new Error(`An action must be specified (${actions.join(', ')})`);
       }
 
       return this.onExecute();
@@ -236,6 +242,13 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
     }
   }
 
+  private _validateDefinitions(): void {
+    if (this.remainder && this.actions.length > 0) {
+      // This is apparently not supported by argparse
+      throw new Error('defineCommandLineRemainder() cannot be called for a CommandLineParser with actions');
+    }
+  }
+
   /**
    * {@inheritDoc CommandLineParameterProvider._getArgumentParser}
    * @internal
@@ -249,6 +262,9 @@ export abstract class CommandLineParser extends CommandLineParameterProvider {
    * the chosen action is executed.
    */
   protected onExecute(): Promise<void> {
-    return this.selectedAction!._execute();
+    if (!this.selectedAction) {
+      return Promise.resolve();
+    }
+    return this.selectedAction._execute();
   }
 }
diff --git a/libraries/ts-command-line/src/index.ts b/libraries/ts-command-line/src/index.ts
index eabad8a0ec..11d4214cf0 100644
--- a/libraries/ts-command-line/src/index.ts
+++ b/libraries/ts-command-line/src/index.ts
@@ -19,7 +19,8 @@ export {
   ICommandLineStringDefinition,
   ICommandLineStringListDefinition,
   ICommandLineIntegerDefinition,
-  ICommandLineChoiceDefinition
+  ICommandLineChoiceDefinition,
+  ICommandLineRemainderDefinition
 } from './CommandLineDefinition';
 
 export {
@@ -30,7 +31,8 @@ export {
   CommandLineStringListParameter,
   CommandLineFlagParameter,
   CommandLineIntegerParameter,
-  CommandLineChoiceParameter
+  CommandLineChoiceParameter,
+  CommandLineRemainder
 } from './CommandLineParameter';
 
 export {
diff --git a/libraries/ts-command-line/src/test/ActionlessParser.test.ts b/libraries/ts-command-line/src/test/ActionlessParser.test.ts
new file mode 100644
index 0000000000..34687a2dc2
--- /dev/null
+++ b/libraries/ts-command-line/src/test/ActionlessParser.test.ts
@@ -0,0 +1,51 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import { CommandLineParser } from '../CommandLineParser';
+import { CommandLineFlagParameter } from '../CommandLineParameter';
+
+
+class TestCommandLine extends CommandLineParser {
+  public flag: CommandLineFlagParameter;
+
+  public constructor() {
+    super({
+      toolFilename: 'example',
+      toolDescription: 'An example project'
+    });
+  }
+
+  protected onDefineParameters(): void {
+    this.flag = this.defineFlagParameter({
+      parameterLongName: '--flag',
+      description: 'The flag'
+    });
+  }
+}
+
+describe('Actionless CommandLineParser', () => {
+
+  it('parses a flag', () => {
+    const commandLineParser: TestCommandLine = new TestCommandLine();
+
+    return commandLineParser.execute(['--flag']).then(() => {
+      expect(commandLineParser.selectedAction).toBeUndefined();
+      expect(commandLineParser.flag.value).toBe(true);
+    });
+  });
+
+  it('parses a flag and remainder', () => {
+    const commandLineParser: TestCommandLine = new TestCommandLine();
+
+    commandLineParser.defineCommandLineRemainder({
+      description: 'remainder description'
+    });
+
+    return commandLineParser.execute(['--flag', 'the', 'remaining', 'args']).then(() => {
+      expect(commandLineParser.selectedAction).toBeUndefined();
+      expect(commandLineParser.flag.value).toBe(true);
+      expect(commandLineParser.remainder!.values).toEqual(['the', 'remaining', 'args']);
+    });
+  });
+
+});
diff --git a/libraries/ts-command-line/src/test/CommandLineParameter.test.ts b/libraries/ts-command-line/src/test/CommandLineParameter.test.ts
index dae0ecfeab..bf63afc03b 100644
--- a/libraries/ts-command-line/src/test/CommandLineParameter.test.ts
+++ b/libraries/ts-command-line/src/test/CommandLineParameter.test.ts
@@ -40,7 +40,7 @@ function createParser(): DynamicCommandLineParser {
     parameterLongName: '--choice-with-default',
     description: 'A choice with a default',
     alternatives: [ 'one', 'two', 'three', 'default' ],
-    environmentVariable: 'ENV_CHOICE',
+    environmentVariable: 'ENV_CHOICE2',
     defaultValue: 'default'
   });
 
@@ -64,13 +64,15 @@ function createParser(): DynamicCommandLineParser {
     parameterLongName: '--integer-with-default',
     description: 'An integer with a default',
     argumentName: 'NUMBER',
-    environmentVariable: 'ENV_INTEGER',
+    environmentVariable: 'ENV_INTEGER2',
     defaultValue: 123
   });
   action.defineIntegerParameter({
     parameterLongName: '--integer-required',
     description: 'An integer',
     argumentName: 'NUMBER',
+    // Not yet supported
+    // environmentVariable: 'ENV_INTEGER_REQUIRED',
     required: true
   });
 
@@ -80,13 +82,13 @@ function createParser(): DynamicCommandLineParser {
     parameterShortName: '-s',
     description: 'A string',
     argumentName: 'TEXT',
-    environmentVariable: 'ENV_INTEGER'
+    environmentVariable: 'ENV_STRING'
   });
   action.defineStringParameter({
     parameterLongName: '--string-with-default',
     description: 'A string with a default',
     argumentName: 'TEXT',
-    environmentVariable: 'ENV_INTEGER',
+    environmentVariable: 'ENV_STRING2',
     defaultValue: '123'
   });
 
@@ -94,9 +96,9 @@ function createParser(): DynamicCommandLineParser {
   action.defineStringListParameter({
     parameterLongName: '--string-list',
     parameterShortName: '-l',
-    description: 'A string list',
-    argumentName: 'LIST',
-    environmentVariable: 'ENV_INTEGER'
+    description: 'This parameter be specified multiple times to make a list of strings',
+    argumentName: 'LIST_ITEM',
+    environmentVariable: 'ENV_STRING_LIST'
   });
   return commandLineParser;
 }
@@ -265,4 +267,40 @@ describe('CommandLineParameter', () => {
       expect(copiedArgs).toMatchSnapshot();
     });
   });
+
+  it('parses each parameter from an environment variable', () => {
+    const commandLineParser: CommandLineParser = createParser();
+    const action: CommandLineAction = commandLineParser.getAction('do:the-job');
+
+    action.defineStringListParameter({
+      parameterLongName: '--json-string-list',
+      description: 'Test JSON parsing',
+      argumentName: 'LIST_ITEM',
+      environmentVariable: 'ENV_JSON_STRING_LIST'
+    });
+
+    const args: string[] = [ 'do:the-job', '--integer-required', '1' ];
+
+    process.env.ENV_CHOICE = 'one';
+    process.env.ENV_CHOICE2 = 'two';
+    process.env.ENV_FLAG = '1';
+    process.env.ENV_INTEGER = '111';
+    process.env.ENV_INTEGER2 = '222';
+    process.env.ENV_INTEGER_REQUIRED = '333';
+    process.env.ENV_STRING = 'Hello, world!';
+    process.env.ENV_STRING2 = 'Hello, world!';
+    process.env.ENV_STRING_LIST = 'simple text';
+    process.env.ENV_JSON_STRING_LIST = ' [ 1, true, "Hello, world!" ] ';
+
+    return commandLineParser.execute(args).then(() => {
+      expect(commandLineParser.selectedAction).toBe(action);
+
+      const copiedArgs: string[] = [];
+      for (const parameter of action.parameters) {
+        copiedArgs.push(`### ${parameter.longName} output: ###`);
+        parameter.appendToArgList(copiedArgs);
+      }
+      expect(copiedArgs).toMatchSnapshot();
+    });
+  });
 });
diff --git a/libraries/ts-command-line/src/test/CommandLineRemainder.test.ts b/libraries/ts-command-line/src/test/CommandLineRemainder.test.ts
new file mode 100644
index 0000000000..b29891b7a8
--- /dev/null
+++ b/libraries/ts-command-line/src/test/CommandLineRemainder.test.ts
@@ -0,0 +1,78 @@
+// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
+// See LICENSE in the project root for license information.
+
+import * as colors from 'colors';
+
+import { CommandLineAction } from '../CommandLineAction';
+import { CommandLineParser } from '../CommandLineParser';
+import { DynamicCommandLineParser } from '../DynamicCommandLineParser';
+import { DynamicCommandLineAction } from '../DynamicCommandLineAction';
+
+function createParser(): DynamicCommandLineParser {
+  const commandLineParser: DynamicCommandLineParser = new DynamicCommandLineParser(
+    {
+      toolFilename: 'example',
+      toolDescription: 'An example project'
+    }
+  );
+  commandLineParser.defineFlagParameter({
+    parameterLongName: '--verbose',
+    description: 'A flag that affects all actions'
+  });
+
+  const action: DynamicCommandLineAction = new DynamicCommandLineAction({
+    actionName: 'run',
+    summary: 'does the job',
+    documentation: 'a longer description'
+  });
+  commandLineParser.addAction(action);
+
+  action.defineStringParameter({
+    parameterLongName: '--title',
+    description: 'A string',
+    argumentName: 'TEXT'
+  });
+
+  // Although this is defined BEFORE the parameter, but it should still capture the end
+  action.defineCommandLineRemainder({
+    description: 'The action remainder'
+  });
+
+  return commandLineParser;
+}
+
+describe('CommandLineRemainder', () => {
+  it('prints the global help', () => {
+    const commandLineParser: CommandLineParser = createParser();
+    const helpText: string = colors.stripColors(commandLineParser.renderHelpText());
+    expect(helpText).toMatchSnapshot();
+  });
+
+  it('prints the action help', () => {
+    const commandLineParser: CommandLineParser = createParser();
+    const helpText: string = colors.stripColors(commandLineParser.getAction('run').renderHelpText());
+    expect(helpText).toMatchSnapshot();
+  });
+
+  it('parses an action input with remainder', () => {
+    const commandLineParser: CommandLineParser = createParser();
+    const action: CommandLineAction = commandLineParser.getAction('run');
+    const args: string[] = [ 'run', '--title', 'The title', 'the', 'remaining', 'args'];
+
+    return commandLineParser.execute(args).then(() => {
+      expect(commandLineParser.selectedAction).toBe(action);
+
+      const copiedArgs: string[] = [];
+      for (const parameter of action.parameters) {
+        copiedArgs.push(`### ${parameter.longName} output: ###`);
+        parameter.appendToArgList(copiedArgs);
+      }
+
+      copiedArgs.push(`### remainder output: ###`);
+      action.remainder!.appendToArgList(copiedArgs);
+
+      expect(copiedArgs).toMatchSnapshot();
+    });
+  });
+
+});
diff --git a/libraries/ts-command-line/src/test/__snapshots__/CommandLineParameter.test.ts.snap b/libraries/ts-command-line/src/test/__snapshots__/CommandLineParameter.test.ts.snap
index adf118c17d..959d1fc95e 100644
--- a/libraries/ts-command-line/src/test/__snapshots__/CommandLineParameter.test.ts.snap
+++ b/libraries/ts-command-line/src/test/__snapshots__/CommandLineParameter.test.ts.snap
@@ -35,7 +35,7 @@ Object {
   "argumentName": undefined,
   "defaultValue": "default",
   "description": "A choice with a default",
-  "environmentVariable": "ENV_CHOICE",
+  "environmentVariable": "ENV_CHOICE2",
   "kind": 0,
   "longName": "--choice-with-default",
   "required": false,
@@ -80,7 +80,7 @@ Object {
   "argumentName": "NUMBER",
   "defaultValue": 123,
   "description": "An integer with a default",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_INTEGER2",
   "kind": 2,
   "longName": "--integer-with-default",
   "required": false,
@@ -110,7 +110,7 @@ Object {
   "argumentName": "TEXT",
   "defaultValue": undefined,
   "description": "A string",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_STRING",
   "kind": 3,
   "longName": "--string",
   "required": false,
@@ -125,7 +125,7 @@ Object {
   "argumentName": "TEXT",
   "defaultValue": "123",
   "description": "A string with a default",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_STRING2",
   "kind": 3,
   "longName": "--string-with-default",
   "required": false,
@@ -137,10 +137,10 @@ Object {
 
 exports[`CommandLineParameter parses an input with ALL parameters 10`] = `
 Object {
-  "argumentName": "LIST",
+  "argumentName": "LIST_ITEM",
   "defaultValue": undefined,
-  "description": "A string list",
-  "environmentVariable": "ENV_INTEGER",
+  "description": "This parameter be specified multiple times to make a list of strings",
+  "environmentVariable": "ENV_STRING_LIST",
   "kind": 4,
   "longName": "--string-list",
   "required": false,
@@ -221,7 +221,7 @@ Object {
   "argumentName": undefined,
   "defaultValue": "default",
   "description": "A choice with a default",
-  "environmentVariable": "ENV_CHOICE",
+  "environmentVariable": "ENV_CHOICE2",
   "kind": 0,
   "longName": "--choice-with-default",
   "required": false,
@@ -266,7 +266,7 @@ Object {
   "argumentName": "NUMBER",
   "defaultValue": 123,
   "description": "An integer with a default",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_INTEGER2",
   "kind": 2,
   "longName": "--integer-with-default",
   "required": false,
@@ -296,7 +296,7 @@ Object {
   "argumentName": "TEXT",
   "defaultValue": undefined,
   "description": "A string",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_STRING",
   "kind": 3,
   "longName": "--string",
   "required": false,
@@ -311,7 +311,7 @@ Object {
   "argumentName": "TEXT",
   "defaultValue": "123",
   "description": "A string with a default",
-  "environmentVariable": "ENV_INTEGER",
+  "environmentVariable": "ENV_STRING2",
   "kind": 3,
   "longName": "--string-with-default",
   "required": false,
@@ -323,10 +323,10 @@ Object {
 
 exports[`CommandLineParameter parses an input with NO parameters 10`] = `
 Object {
-  "argumentName": "LIST",
+  "argumentName": "LIST_ITEM",
   "defaultValue": undefined,
-  "description": "A string list",
-  "environmentVariable": "ENV_INTEGER",
+  "description": "This parameter be specified multiple times to make a list of strings",
+  "environmentVariable": "ENV_STRING_LIST",
   "kind": 4,
   "longName": "--string-list",
   "required": false,
@@ -358,12 +358,50 @@ Array [
 ]
 `;
 
+exports[`CommandLineParameter parses each parameter from an environment variable 1`] = `
+Array [
+  "### --choice output: ###",
+  "--choice",
+  "one",
+  "### --choice-with-default output: ###",
+  "--choice-with-default",
+  "two",
+  "### --flag output: ###",
+  "--flag",
+  "### --integer output: ###",
+  "--integer",
+  "111",
+  "### --integer-with-default output: ###",
+  "--integer-with-default",
+  "222",
+  "### --integer-required output: ###",
+  "--integer-required",
+  "1",
+  "### --string output: ###",
+  "--string",
+  "Hello, world!",
+  "### --string-with-default output: ###",
+  "--string-with-default",
+  "Hello, world!",
+  "### --string-list output: ###",
+  "--string-list",
+  "simple text",
+  "### --json-string-list output: ###",
+  "--json-string-list",
+  "1",
+  "--json-string-list",
+  "true",
+  "--json-string-list",
+  "Hello, world!",
+]
+`;
+
 exports[`CommandLineParameter prints the action help 1`] = `
 "usage: example do:the-job [-h] [-c {one,two,three,default}]
                           [--choice-with-default {one,two,three,default}] [-f]
                           [-i NUMBER] [--integer-with-default NUMBER]
                           --integer-required NUMBER [-s TEXT]
-                          [--string-with-default TEXT] [-l LIST]
+                          [--string-with-default TEXT] [-l LIST_ITEM]
                           
 
 a longer description
@@ -375,7 +413,7 @@ Optional arguments:
                         via the ENV_CHOICE environment variable.
   --choice-with-default {one,two,three,default}
                         A choice with a default. This parameter may 
-                        alternatively specified via the ENV_CHOICE 
+                        alternatively specified via the ENV_CHOICE2 
                         environment variable. The default value is \\"default\\".
   -f, --flag            A flag. This parameter may alternatively specified 
                         via the ENV_FLAG environment variable.
@@ -384,20 +422,22 @@ Optional arguments:
                         specified via the ENV_INTEGER environment variable.
   --integer-with-default NUMBER
                         An integer with a default. This parameter may 
-                        alternatively specified via the ENV_INTEGER 
+                        alternatively specified via the ENV_INTEGER2 
                         environment variable. The default value is 123.
   --integer-required NUMBER
                         An integer
   -s TEXT, --string TEXT
                         A string. This parameter may alternatively specified 
-                        via the ENV_INTEGER environment variable.
+                        via the ENV_STRING environment variable.
   --string-with-default TEXT
                         A string with a default. This parameter may 
-                        alternatively specified via the ENV_INTEGER 
+                        alternatively specified via the ENV_STRING2 
                         environment variable. The default value is \\"123\\".
-  -l LIST, --string-list LIST
-                        A string list. This parameter may alternatively 
-                        specified via the ENV_INTEGER environment variable.
+  -l LIST_ITEM, --string-list LIST_ITEM
+                        This parameter be specified multiple times to make a 
+                        list of strings. This parameter may alternatively 
+                        specified via the ENV_STRING_LIST environment 
+                        variable.
 "
 `;
 
diff --git a/libraries/ts-command-line/src/test/__snapshots__/CommandLineRemainder.test.ts.snap b/libraries/ts-command-line/src/test/__snapshots__/CommandLineRemainder.test.ts.snap
new file mode 100644
index 0000000000..e11dc7a569
--- /dev/null
+++ b/libraries/ts-command-line/src/test/__snapshots__/CommandLineRemainder.test.ts.snap
@@ -0,0 +1,44 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`CommandLineRemainder parses an action input with remainder 1`] = `
+Array [
+  "### --title output: ###",
+  "--title",
+  "The title",
+  "### remainder output: ###",
+  "the",
+  "remaining",
+  "args",
+]
+`;
+
+exports[`CommandLineRemainder prints the action help 1`] = `
+"usage: example run [-h] [--title TEXT] ...
+
+a longer description
+
+Positional arguments:
+  \\"...\\"         The action remainder
+
+Optional arguments:
+  -h, --help    Show this help message and exit.
+  --title TEXT  A string
+"
+`;
+
+exports[`CommandLineRemainder prints the global help 1`] = `
+"usage: example [-h] [--verbose] <command> ...
+
+An example project
+
+Positional arguments:
+  <command>
+    run       does the job
+
+Optional arguments:
+  -h, --help  Show this help message and exit.
+  --verbose   A flag that affects all actions
+
+For detailed help about a specific command, use: example <command> -h
+"
+`;
diff --git a/rush.json b/rush.json
index 9d7dfd39e4..3c2f721ee4 100644
--- a/rush.json
+++ b/rush.json
@@ -597,6 +597,12 @@
       "reviewCategory": "tests",
       "shouldPublish": false
     },
+    {
+      "packageName": "ts-command-line-test",
+      "projectFolder": "build-tests/ts-command-line-test",
+      "reviewCategory": "tests",
+      "shouldPublish": false
+    },
     {
       "packageName": "web-library-build-test",
       "projectFolder": "build-tests/web-library-build-test",