feat(jsii-config): introducing jsii-config (#981)

Defines jsii-config CLI application for configuring a jsii package's jsii options inside package.json. These options dictate what target languages and language specific packaging options jsii uses when building.

The application uses inquirer for interactive prompts and yargs for argument parsing.

jsii-config will help configure packages with or without an existing jsii configuration in package.json. If the object does exist, the default values of fields that are prompted will be the existing values. This allows users to just hit 'enter' until they get to the options they wish to change and modify only those.

After the user inputs all of the values for the relevant prompts, they are asked to confirm the config. If the user selects 'yes', the config is written to package.json, if they select 'no', they will be prompted to fill out the fields again, however, the default values will now be what they previously entered. This is done so the user will only need to change the specific fields that need it.

Fixes #904

docs/configuration.md

@@ -6,6 +6,10 @@ constraints and extensions `jsii` adds to the [package.json schema].
 
 [package.json schema]: https://docs.npmjs.com/files/package.json
 
+## jsii-config
+
+Use [jsii-config](https://github.com/aws/jsii/blob/master/jsii-config) to aid in configuring a new jsii module.
+
 ## Additional Requirements & Extensions
 
 In order to be able to generate valid packages for all the supported target

packages/jsii-config/.eslintrc.yaml

@@ -0,0 +1,2 @@
+---
+extends: ../../eslint-config.yaml

packages/jsii-config/.gitignore

@@ -0,0 +1,4 @@
+*.js
+*.d.ts
+node_modules/
+coverage/

packages/jsii-config/.npmignore

@@ -0,0 +1,13 @@
+*
+
+!**/*.js
+!**/*.d.ts
+!bin/jsii-config
+
+coverage
+
+# Don't include various configuration & state information
+coverage
+.eslintrc.*
+tsconfig.json
+*.tsbuildinfo

packages/jsii-config/LICENSE

@@ -0,0 +1,202 @@
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packages/jsii-config/README.md

@@ -0,0 +1,27 @@
+# ![jsii-config](./demo.gif)
+
+jsii-config is a command line utility for configuring [jsii enabled modules](https://github.com/aws/jsii). It is useful to help convert an existing typescript module to a jsii module. It can also be used to revise existing jsii compiler configuration optiions, such as adding a new language target.
+
+[See the jsii documentation](https://github.com/aws/jsii/blob/master/docs/configuration.md) for more information on how the configuration options affect jsii's output.
+
+## Usage
+
+jsii-config requires an existing package.json with the following fields:
+
+- name
+- version
+- repository
+- main
+- author
+
+For details on the content of these fields, [see the jsii documentation](https://github.com/aws/jsii/blob/master/docs/configuration.md#additional-requirements--extensions).
+
+jsii-config can be called via npx.
+
+`npx jsii-config`
+
+When called without arguments, the resulting jsii-config will be written to the package.json in the current working directory. To specify a package.json file in another location, use the `--package-json` or `-p` option.
+
+`npx jsii-config -p ./some-dir/package.json`
+
+jsii-config can be run with the `--dry-run` or `-d` option to print the resulting config to stdout instead of writing to package.json. This can be useful for viewing the tool's output withou changing your package.json.

packages/jsii-config/bin/jsii-config

@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+require('./jsii-config.js');

packages/jsii-config/bin/jsii-config.ts

@@ -0,0 +1,46 @@
+import * as yargs from 'yargs';
+import { promisify } from 'util';
+import { writeFile } from 'fs';
+import jsiiConfig from '../lib';
+
+const writeFilePromise = promisify(writeFile);
+/*
+ * Read package.json and prompt user for new or revised jsii config values.
+ */
+async function main() {
+  const argv = yargs
+    .command('$0 [args]', 'configure jsii compilation options in package.json')
+    .option('package-json', {
+      alias: 'p',
+      type: 'string',
+      description: 'location of module\'s package.json file',
+      default: './package.json'
+    })
+    .option('dry-run', {
+      alias: 'd',
+      type: 'boolean',
+      description: 'print output to stdout, don\'t write to package.json',
+      default: false
+    })
+    .help()
+    .argv;
+
+  const packageJsonLocation = argv.packageJson as string;
+  const output = await jsiiConfig(packageJsonLocation);
+
+  if (argv.dryRun) {
+    console.log(output);
+  } else {
+    await writeFilePromise(packageJsonLocation, JSON.stringify(output, null, 2));
+  }
+}
+
+main()
+  .then(() => {
+    console.log('Success!');
+    process.exit(0);
+  })
+  .catch(err => {
+    console.error(err.message);
+    process.exit(100);
+  });

packages/jsii-config/lib/index.ts

@@ -0,0 +1,14 @@
+import { readFilePromise } from './util';
+import prompt from './prompt';
+import validatePackageJson from './validate';
+
+export default async function jsiiConfig(packageJsonLocation: string) {
+  const manifest = await readFilePromise(packageJsonLocation);
+  const packageJson = validatePackageJson(JSON.parse(manifest.toString()));
+
+  const answers = await prompt(packageJson);
+  return {
+    ...packageJson,
+    ...answers
+  };
+}

packages/jsii-config/lib/prompt.ts

@@ -0,0 +1,45 @@
+import * as inquirer from 'inquirer';
+import { PackageJson } from 'jsii-spec';
+import getQuestions from './questions';
+import { BasePackageJson } from './schema';
+import { getNestedValue } from './util';
+
+interface PromptAnswers extends PackageJson {
+  jsiiTargets: string[];
+}
+
+function getPassThroughValues(current: BasePackageJson): object {
+  const metadata = getNestedValue(['jsii', 'metadata'], current);
+  return {
+    ...metadata ? { metadata } : {}
+  };
+}
+
+/*
+ * Takes current config and prompts for new values
+ *
+ * Uses any values already present as defaults for the prompt
+ */
+export default async function getAnswers(current: BasePackageJson): Promise<PackageJson> {
+  const answers = await inquirer.prompt(getQuestions(current)) as PromptAnswers;
+  const { jsiiTargets: _, ...config } = answers;
+  const confirmInput = await inquirer.prompt({
+    type: 'confirm',
+    message: `Confirm Jsii Config\n${JSON.stringify(config, null, 2)}\nSelect no to revise`,
+    name: 'confirm'
+  });
+
+  const newConfig = {
+    ...config,
+    jsii: {
+      ...config.jsii,
+      ...getPassThroughValues(current)
+    }
+  };
+
+  if (confirmInput.confirm) {
+    return newConfig;
+  }
+
+  return getAnswers(newConfig);
+}