Describe defaults of more options

src/compiler/types.ts

@@ -6335,7 +6335,7 @@ namespace ts {
         isFilePath?: boolean;                                   // True if option value is a path or fileName
         shortName?: string;                                     // A short mnemonic for convenience - for instance, 'h' can be used in place of 'help'
         description?: DiagnosticMessage;                        // The message describing what the command line switch does.
-        defaultValueDescription?: string | DiagnosticMessage;   // The message describing what the dafault value is. string type is prepared for fixed chosen like "false" which do not need I18n.
+        defaultValueDescription?: string | number | boolean | DiagnosticMessage;   // The message describing what the dafault value is. string type is prepared for fixed chosen like "false" which do not need I18n.
         paramType?: DiagnosticMessage;                          // The name to be used for a non-boolean option's parameter
         isTSConfigOnly?: boolean;                               // True if option can only be specified via tsconfig.json file
         isCommandLineOnly?: boolean;
@@ -6355,23 +6355,25 @@ namespace ts {
     /* @internal */
     export interface CommandLineOptionOfStringType extends CommandLineOptionBase {
         type: "string";
+        defaultValueDescription?: string | undefined | DiagnosticMessage;
     }
 
     /* @internal */
     export interface CommandLineOptionOfNumberType extends CommandLineOptionBase {
         type: "number";
-        defaultValueDescription: `${number | undefined}` | DiagnosticMessage;
+        defaultValueDescription: number | undefined | DiagnosticMessage;
     }
 
     /* @internal */
     export interface CommandLineOptionOfBooleanType extends CommandLineOptionBase {
         type: "boolean";
-        defaultValueDescription: `${boolean | undefined}` | DiagnosticMessage;
+        defaultValueDescription: boolean | undefined | DiagnosticMessage;
     }
 
     /* @internal */
     export interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
         type: ESMap<string, number | string>;  // an object literal mapping named values to actual values
+        defaultValueDescription: number | string | undefined | DiagnosticMessage;
     }
 
     /* @internal */

src/executeCommandLine/executeCommandLine.ts

@@ -160,7 +160,13 @@ namespace ts {
 
         // value type and possible value
         const valueCandidates = getValueCandidate(option);
-        const defaultValueDescription = typeof option.defaultValueDescription === "object" ? getDiagnosticText(option.defaultValueDescription) : option.defaultValueDescription;
+        const defaultValueDescription =
+            typeof option.defaultValueDescription === "object"
+                ? getDiagnosticText(option.defaultValueDescription)
+                : formatDefaultValue(
+                      option.defaultValueDescription,
+                      option.type === "list" ? option.element.type : option.type
+                  );
         const terminalWidth = sys.getWidthOfTerminal?.() ?? 0;
 
         // Note: child_process might return `terminalWidth` as undefined.
@@ -203,6 +209,19 @@ namespace ts {
         }
         return text;
 
+        function formatDefaultValue(
+            defaultValue: CommandLineOption["defaultValueDescription"],
+            type: CommandLineOption["type"]
+        ) {
+            return defaultValue !== undefined && typeof type === "object"
+                // e.g. ScriptTarget.ES2015 -> "es6/es2015"
+                ? arrayFrom(type.entries())
+                      .filter(([, value]) => value === defaultValue)
+                      .map(([name]) => name)
+                      .join("/")
+                : String(defaultValue);
+        }
+
         function showAdditionalInfoOutput(valueCandidates: ValueCandidate | undefined, option: CommandLineOption): boolean {
             const ignoreValues = ["string"];
             const ignoredDescriptions = [undefined, "false", "n/a"];
@@ -286,8 +305,14 @@ namespace ts {
                         break;
                     default:
                         // ESMap<string, number | string>
-                        const keys = arrayFrom(option.type.keys());
-                        possibleValues = keys.join(", ");
+                        // Group synonyms: es6/es2015
+                        const inverted: { [value: string]: string[] } = {};
+                        option.type.forEach((value, name) => {
+                            (inverted[value] ||= []).push(name);
+                        });
+                        return getEntries(inverted)
+                            .map(([, synonyms]) => synonyms.join("/"))
+                            .join(", ");
                 }
                 return possibleValues;
             }

src/harness/harnessIO.ts

@@ -304,21 +304,21 @@ namespace Harness {
 
         // Additional options not already in ts.optionDeclarations
         const harnessOptionDeclarations: ts.CommandLineOption[] = [
-            { name: "allowNonTsExtensions", type: "boolean", defaultValueDescription: "false" },
-            { name: "useCaseSensitiveFileNames", type: "boolean", defaultValueDescription: "false" },
+            { name: "allowNonTsExtensions", type: "boolean", defaultValueDescription: false },
+            { name: "useCaseSensitiveFileNames", type: "boolean", defaultValueDescription: false },
             { name: "baselineFile", type: "string" },
             { name: "includeBuiltFile", type: "string" },
             { name: "fileName", type: "string" },
             { name: "libFiles", type: "string" },
-            { name: "noErrorTruncation", type: "boolean", defaultValueDescription: "false" },
-            { name: "suppressOutputPathCheck", type: "boolean", defaultValueDescription: "false" },
-            { name: "noImplicitReferences", type: "boolean", defaultValueDescription: "false" },
+            { name: "noErrorTruncation", type: "boolean", defaultValueDescription: false },
+            { name: "suppressOutputPathCheck", type: "boolean", defaultValueDescription: false },
+            { name: "noImplicitReferences", type: "boolean", defaultValueDescription: false },
             { name: "currentDirectory", type: "string" },
             { name: "symlink", type: "string" },
             { name: "link", type: "string" },
-            { name: "noTypesAndSymbols", type: "boolean", defaultValueDescription: "false" },
+            { name: "noTypesAndSymbols", type: "boolean", defaultValueDescription: false },
             // Emitted js baseline will print full paths for every output file
-            { name: "fullEmitPaths", type: "boolean", defaultValueDescription: "false" }
+            { name: "fullEmitPaths", type: "boolean", defaultValueDescription: false },
         ];
 
         let optionsIndex: ts.ESMap<string, ts.CommandLineOption>;

src/testRunner/unittests/config/commandLineParsing.ts

@@ -534,7 +534,7 @@ namespace ts {
                                 isTSConfigOnly: true,
                                 category: Diagnostics.Backwards_Compatibility,
                                 description: Diagnostics.Enable_project_compilation,
-                                defaultValueDescription: "undefined",
+                                defaultValueDescription: undefined,
                             }
                         ];
                         return {

tests/baselines/reference/tsc/runWithoutArgs/initial-build/does-not-add-color-when-NO_COLOR-is-set.js

@@ -68,16 +68,18 @@ default: true
 
 --target, -t
 Set the JavaScript language version for emitted JavaScript and include compatible library declarations.
-one of: es3, es5, es6, es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
-default: ES3
+one of: es3, es5, es6/es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
+default: es3
 
 --module, -m
 Specify what module code is generated.
-one of: none, commonjs, amd, system, umd, es6, es2015, es2020, es2022, esnext, node12, nodenext
+one of: none, commonjs, amd, umd, system, es6/es2015, es2020, es2022, esnext, node12, nodenext
+default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6, es2015, es7, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol, es2020.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise, es2021.string, es2021.weakref, es2021.intl, es2022.array, es2022.error, es2022.object, es2022.string, esnext.array, esnext.symbol, esnext.asynciterable, esnext.intl, esnext.bigint, esnext.string, esnext.promise, esnext.weakref
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2020.bigint/esnext.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise/esnext.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array/esnext.array, es2022.error, es2022.object, es2022.string/esnext.string, esnext.intl
+default: undefined
 
 --allowJs
 Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files.
@@ -91,7 +93,7 @@ default: false
 
 --jsx
 Specify what JSX code is generated.
-one of: preserve, react-native, react, react-jsx, react-jsxdev
+one of: preserve, react, react-native, react-jsx, react-jsxdev
 default: undefined
 
 --declaration, -d

tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped-when-host-can't-provide-terminal-width.js

@@ -68,16 +68,18 @@ default: true
 
 --target, -t
 Set the JavaScript language version for emitted JavaScript and include compatible library declarations.
-one of: es3, es5, es6, es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
-default: ES3
+one of: es3, es5, es6/es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
+default: es3
 
 --module, -m
 Specify what module code is generated.
-one of: none, commonjs, amd, system, umd, es6, es2015, es2020, es2022, esnext, node12, nodenext
+one of: none, commonjs, amd, umd, system, es6/es2015, es2020, es2022, esnext, node12, nodenext
+default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6, es2015, es7, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol, es2020.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise, es2021.string, es2021.weakref, es2021.intl, es2022.array, es2022.error, es2022.object, es2022.string, esnext.array, esnext.symbol, esnext.asynciterable, esnext.intl, esnext.bigint, esnext.string, esnext.promise, esnext.weakref
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2020.bigint/esnext.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise/esnext.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array/esnext.array, es2022.error, es2022.object, es2022.string/esnext.string, esnext.intl
+default: undefined
 
 --allowJs
 Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files.
@@ -91,7 +93,7 @@ default: false
 
 --jsx
 Specify what JSX code is generated.
-one of: preserve, react-native, react, react-jsx, react-jsxdev
+one of: preserve, react, react-native, react-jsx, react-jsxdev
 default: undefined
 
 --declaration, -d

tests/baselines/reference/tsc/runWithoutArgs/initial-build/show-help-with-ExitStatus.DiagnosticsPresent_OutputsSkipped.js

@@ -68,16 +68,18 @@ default: true
 
 --target, -t
 Set the JavaScript language version for emitted JavaScript and include compatible library declarations.
-one of: es3, es5, es6, es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
-default: ES3
+one of: es3, es5, es6/es2015, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext
+default: es3
 
 --module, -m
 Specify what module code is generated.
-one of: none, commonjs, amd, system, umd, es6, es2015, es2020, es2022, esnext, node12, nodenext
+one of: none, commonjs, amd, umd, system, es6/es2015, es2020, es2022, esnext, node12, nodenext
+default: undefined
 
 --lib
 Specify a set of bundled library declaration files that describe the target runtime environment.
-one or more: es5, es6, es2015, es7, es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol, es2020.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise, es2021.string, es2021.weakref, es2021.intl, es2022.array, es2022.error, es2022.object, es2022.string, esnext.array, esnext.symbol, esnext.asynciterable, esnext.intl, esnext.bigint, esnext.string, esnext.promise, esnext.weakref
+one or more: es5, es6/es2015, es7/es2016, es2017, es2018, es2019, es2020, es2021, es2022, esnext, dom, dom.iterable, webworker, webworker.importscripts, webworker.iterable, scripthost, es2015.core, es2015.collection, es2015.generator, es2015.iterable, es2015.promise, es2015.proxy, es2015.reflect, es2015.symbol, es2015.symbol.wellknown, es2016.array.include, es2017.object, es2017.sharedmemory, es2017.string, es2017.intl, es2017.typedarrays, es2018.asyncgenerator, es2018.asynciterable/esnext.asynciterable, es2018.intl, es2018.promise, es2018.regexp, es2019.array, es2019.object, es2019.string, es2019.symbol/esnext.symbol, es2020.bigint/esnext.bigint, es2020.promise, es2020.sharedmemory, es2020.string, es2020.symbol.wellknown, es2020.intl, es2021.promise/esnext.promise, es2021.string, es2021.weakref/esnext.weakref, es2021.intl, es2022.array/esnext.array, es2022.error, es2022.object, es2022.string/esnext.string, esnext.intl
+default: undefined
 
 --allowJs
 Allow JavaScript files to be a part of your program. Use the `checkJS` option to get errors from these files.
@@ -91,7 +93,7 @@ default: false
 
 --jsx
 Specify what JSX code is generated.
-one of: preserve, react-native, react, react-jsx, react-jsxdev
+one of: preserve, react, react-native, react-jsx, react-jsxdev
 default: undefined
 
 --declaration, -d