microsoft
diff --git a/‎src/compiler/commandLineParser.ts
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+122-139Lines changed: 122 additions & 139 deletions b/‎src/compiler/commandLineParser.ts
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+122-139Lines changed: 122 additions & 139 deletions
diff --git a/‎src/compiler/diagnosticMessages.json
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+36Lines changed: 36 additions & 0 deletions b/‎src/compiler/diagnosticMessages.json
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+36Lines changed: 36 additions & 0 deletions
diff --git a/‎src/compiler/executeCommandLine.ts
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+3-6Lines changed: 3 additions & 6 deletions b/‎src/compiler/executeCommandLine.ts
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+3-6Lines changed: 3 additions & 6 deletions
diff --git a/‎src/testRunner/unittests/config/initializeTSConfig.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/testRunner/unittests/config/initializeTSConfig.ts
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+1-1Lines changed: 1 addition & 1 deletion
@@ -44,7 +44,6 @@ import {
     filterMutate,
     find,
     findIndex,
-    firstOrUndefinedIterator,
     flatten,
     forEach,
     forEachEntry,
@@ -2789,140 +2788,146 @@ function serializeOptionBaseObject(
     return result;
 }
 
-/**
- * Generate a list of the compiler options whose value is not the default.
- * @param options compilerOptions to be evaluated.
-/** @internal */
-export function getCompilerOptionsDiffValue(options: CompilerOptions, newLine: string): string {
-    const compilerOptionsMap = getSerializedCompilerOption(options);
-    return getOverwrittenDefaultOptions();
-
-    function makePadding(paddingLength: number): string {
-        return Array(paddingLength + 1).join(" ");
-    }
-
-    function getOverwrittenDefaultOptions() {
-        const result: string[] = [];
-        const tab = makePadding(2);
-        commandOptionsWithoutBuild.forEach(cmd => {
-            if (!compilerOptionsMap.has(cmd.name)) {
-                return;
-            }
-
-            const newValue = compilerOptionsMap.get(cmd.name);
-            const defaultValue = getDefaultValueForOption(cmd);
-            if (newValue !== defaultValue) {
-                result.push(`${tab}${cmd.name}: ${newValue}`);
-            }
-            else if (hasProperty(defaultInitCompilerOptions, cmd.name)) {
-                result.push(`${tab}${cmd.name}: ${defaultValue}`);
-            }
-        });
-        return result.join(newLine) + newLine;
-    }
-}
-
-/**
- * Get the compiler options to be written into the tsconfig.json.
- * @param options commandlineOptions to be included in the compileOptions.
- */
-function getSerializedCompilerOption(options: CompilerOptions): Map<string, CompilerOptionsValue> {
-    const compilerOptions = extend(options, defaultInitCompilerOptions);
-    return serializeCompilerOptions(compilerOptions);
-}
 /**
  * Generate tsconfig configuration when running command line "--init"
  * @param options commandlineOptions to be generated into tsconfig.json
- * @param fileNames array of filenames to be generated into tsconfig.json
- *
  * @internal
  */
-export function generateTSConfig(options: CompilerOptions, fileNames: readonly string[], newLine: string): string {
-    const compilerOptionsMap = getSerializedCompilerOption(options);
-    return writeConfigurations();
+export function generateTSConfig(options: CompilerOptions, newLine: string): string {
+    type PresetValue = string | number | boolean | (string | number | boolean)[];
+
+    const tab = "  ";
+    const result: string[] = [];
+    const allSetOptions = Object.keys(options).filter(k => k !== "init" && k !== "help" && k !== "watch");
+
+    result.push(`{`);
+    result.push(`${tab}// ${getLocaleSpecificMessage(Diagnostics.Visit_https_Colon_Slash_Slashaka_ms_Slashtsconfig_to_read_more_about_this_file)}`);
+    result.push(`${tab}"compilerOptions": {`);
+
+    emitHeader(Diagnostics.File_Layout);
+    emitOption("rootDir", "./src", "optional");
+    emitOption("outDir", "./dist", "optional");
+
+    newline();
+
+    emitHeader(Diagnostics.Environment_Settings);
+    emitHeader(Diagnostics.See_also_https_Colon_Slash_Slashaka_ms_Slashtsconfig_Slashmodule);
+    emitOption("module", ModuleKind.NodeNext);
+    emitOption("target", ScriptTarget.ESNext);
+    emitOption("types", []);
+    if (options.lib) {
+        emitOption("lib", options.lib);
+    }
+    emitHeader(Diagnostics.For_nodejs_Colon);
+    result.push(`${tab}${tab}// "lib": ["esnext"],`);
+    result.push(`${tab}${tab}// "types": ["node"],`);
+    emitHeader(Diagnostics.and_npm_install_D_types_Slashnode);
+
+    newline();
+
+    emitHeader(Diagnostics.Other_Outputs);
+    emitOption("sourceMap", /*defaultValue*/ true);
+    emitOption("declaration", /*defaultValue*/ true);
+    emitOption("declarationMap", /*defaultValue*/ true);
+
+    newline();
+
+    emitHeader(Diagnostics.Stricter_Typechecking_Options);
+    emitOption("noUncheckedIndexedAccess", /*defaultValue*/ true);
+    emitOption("exactOptionalPropertyTypes", /*defaultValue*/ true);
+
+    newline();
+
+    emitHeader(Diagnostics.Style_Options);
+    emitOption("noImplicitReturns", /*defaultValue*/ true, "optional");
+    emitOption("noImplicitOverride", /*defaultValue*/ true, "optional");
+    emitOption("noUnusedLocals", /*defaultValue*/ true, "optional");
+    emitOption("noUnusedParameters", /*defaultValue*/ true, "optional");
+    emitOption("noFallthroughCasesInSwitch", /*defaultValue*/ true, "optional");
+    emitOption("noPropertyAccessFromIndexSignature", /*defaultValue*/ true, "optional");
+
+    newline();
+
+    emitHeader(Diagnostics.Recommended_Options);
+    emitOption("strict", /*defaultValue*/ true);
+    emitOption("jsx", JsxEmit.ReactJSX);
+    emitOption("verbatimModuleSyntax", /*defaultValue*/ true);
+    emitOption("isolatedModules", /*defaultValue*/ true);
+    emitOption("noUncheckedSideEffectImports", /*defaultValue*/ true);
+    emitOption("moduleDetection", ModuleDetectionKind.Force);
+    emitOption("skipLibCheck", /*defaultValue*/ true);
+
+    // Write any user-provided options we haven't already
+    if (allSetOptions.length > 0) {
+        newline();
+        while (allSetOptions.length > 0) {
+            emitOption(allSetOptions[0], options[allSetOptions[0]]);
+        }
+    }
 
-    function makePadding(paddingLength: number): string {
-        return Array(paddingLength + 1).join(" ");
+    function newline() {
+        result.push("");
     }
 
-    function isAllowedOptionForOutput({ category, name, isCommandLineOnly }: CommandLineOption): boolean {
-        // Skip options which do not have a category or have categories which are more niche
-        const categoriesToSkip = [Diagnostics.Command_line_Options, Diagnostics.Editor_Support, Diagnostics.Compiler_Diagnostics, Diagnostics.Backwards_Compatibility, Diagnostics.Watch_and_Build_Modes, Diagnostics.Output_Formatting];
-        return !isCommandLineOnly && category !== undefined && (!categoriesToSkip.includes(category) || compilerOptionsMap.has(name));
+    function emitHeader(header: DiagnosticMessage) {
+        result.push(`${tab}${tab}// ${getLocaleSpecificMessage(header)}`);
     }
 
-    function writeConfigurations() {
-        // Filter applicable options to place in the file
-        const categorizedOptions = new Map<DiagnosticMessage, CommandLineOption[]>();
-        // Set allowed categories in order
-        categorizedOptions.set(Diagnostics.Projects, []);
-        categorizedOptions.set(Diagnostics.Language_and_Environment, []);
-        categorizedOptions.set(Diagnostics.Modules, []);
-        categorizedOptions.set(Diagnostics.JavaScript_Support, []);
-        categorizedOptions.set(Diagnostics.Emit, []);
-        categorizedOptions.set(Diagnostics.Interop_Constraints, []);
-        categorizedOptions.set(Diagnostics.Type_Checking, []);
-        categorizedOptions.set(Diagnostics.Completeness, []);
-        for (const option of optionDeclarations) {
-            if (isAllowedOptionForOutput(option)) {
-                let listForCategory = categorizedOptions.get(option.category!);
-                if (!listForCategory) categorizedOptions.set(option.category!, listForCategory = []);
-                listForCategory.push(option);
-            }
+    // commented = 'always': Always comment this out, even if it's on commandline
+    // commented = 'optional': Comment out unless it's on commandline
+    // commented = 'never': Never comment this out
+    function emitOption<K extends string & keyof CompilerOptions>(setting: K, defaultValue: CompilerOptions[K], commented: "always" | "optional" | "never" = "never") {
+        const existingOptionIndex = allSetOptions.indexOf(setting);
+        if (existingOptionIndex >= 0) {
+            allSetOptions.splice(existingOptionIndex, 1);
         }
 
-        // Serialize all options and their descriptions
-        let marginLength = 0;
-        let seenKnownKeys = 0;
-        const entries: { value: string; description?: string; }[] = [];
-        categorizedOptions.forEach((options, category) => {
-            if (entries.length !== 0) {
-                entries.push({ value: "" });
-            }
-            entries.push({ value: `/* ${getLocaleSpecificMessage(category)} */` });
-            for (const option of options) {
-                let optionName;
-                if (compilerOptionsMap.has(option.name)) {
-                    optionName = `"${option.name}": ${JSON.stringify(compilerOptionsMap.get(option.name))}${(seenKnownKeys += 1) === compilerOptionsMap.size ? "" : ","}`;
-                }
-                else {
-                    optionName = `// "${option.name}": ${JSON.stringify(getDefaultValueForOption(option))},`;
-                }
-                entries.push({
-                    value: optionName,
-                    description: `/* ${option.description && getLocaleSpecificMessage(option.description) || option.name} */`,
-                });
-                marginLength = Math.max(optionName.length, marginLength);
-            }
-        });
-
-        // Write the output
-        const tab = makePadding(2);
-        const result: string[] = [];
-        result.push(`{`);
-        result.push(`${tab}"compilerOptions": {`);
-        result.push(`${tab}${tab}/* ${getLocaleSpecificMessage(Diagnostics.Visit_https_Colon_Slash_Slashaka_ms_Slashtsconfig_to_read_more_about_this_file)} */`);
-        result.push("");
-        // Print out each row, aligning all the descriptions on the same column.
-        for (const entry of entries) {
-            const { value, description = "" } = entry;
-            result.push(value && `${tab}${tab}${value}${description && (makePadding(marginLength - value.length + 2) + description)}`);
+        let comment: boolean;
+        if (commented === "always") {
+            comment = true;
         }
-        if (fileNames.length) {
-            result.push(`${tab}},`);
-            result.push(`${tab}"files": [`);
-            for (let i = 0; i < fileNames.length; i++) {
-                result.push(`${tab}${tab}${JSON.stringify(fileNames[i])}${i === fileNames.length - 1 ? "" : ","}`);
-            }
-            result.push(`${tab}]`);
+        else if (commented === "never") {
+            comment = false;
         }
         else {
-            result.push(`${tab}}`);
+            comment = !hasProperty(options, setting);
         }
-        result.push(`}`);
 
-        return result.join(newLine) + newLine;
+        const value = (options[setting] ?? defaultValue) as PresetValue;
+        if (comment) {
+            result.push(`${tab}${tab}// "${setting}": ${formatValueOrArray(setting, value)},`);
+        }
+        else {
+            result.push(`${tab}${tab}"${setting}": ${formatValueOrArray(setting, value)},`);
+        }
     }
+
+    function formatValueOrArray(settingName: string, value: PresetValue): string {
+        const option = optionDeclarations.filter(c => c.name === settingName)[0];
+        if (!option) Debug.fail(`No option named ${settingName}?`);
+        const map = (option.type instanceof Map) ? option.type : undefined;
+        if (isArray(value)) {
+            // eslint-disable-next-line local/no-in-operator
+            const map = ("element" in option && (option.element.type instanceof Map)) ? option.element.type : undefined;
+            return `[${value.map(v => formatSingleValue(v, map)).join(", ")}]`;
+        }
+        else {
+            return formatSingleValue(value, map);
+        }
+    }
+
+    function formatSingleValue(value: PresetValue, map: Map<string, string | number> | undefined) {
+        if (map) {
+            value = getNameOfCompilerOptionValue(value as string | number, map) ?? Debug.fail(`No matching value of ${value}`);
+        }
+        return JSON.stringify(value);
+    }
+
+    result.push(`${tab}}`);
+    result.push(`}`);
+    result.push(``);
+
+    return result.join(newLine);
 }
 
 /** @internal */
@@ -4256,25 +4261,3 @@ function getOptionValueWithEmptyStrings(value: any, option: CommandLineOption):
             });
     }
 }
-
-function getDefaultValueForOption(option: CommandLineOption): {} {
-    switch (option.type) {
-        case "number":
-            return 1;
-        case "boolean":
-            return true;
-        case "string":
-            const defaultValue = option.defaultValueDescription;
-            return option.isFilePath ? `./${defaultValue && typeof defaultValue === "string" ? defaultValue : ""}` : "";
-        case "list":
-            return [];
-        case "listOrElement":
-            return getDefaultValueForOption(option.element);
-        case "object":
-            return {};
-        default:
-            const value = firstOrUndefinedIterator(option.type.keys());
-            if (value !== undefined) return value;
-            return Debug.fail("Expected 'option.type' to have entries.");
-    }
-}
@@ -5702,6 +5702,42 @@
         "category": "Message",
         "code": 6283
     },
+    "File Layout": {
+        "category": "Message",
+        "code": 6284
+    },
+    "Environment Settings": {
+        "category": "Message",
+        "code": 6285
+    },
+    "See also https://aka.ms/tsconfig/module": {
+        "category": "Message",
+        "code": 6286
+    },
+    "For nodejs:": {
+        "category": "Message",
+        "code": 6287
+    },
+    "and npm install -D @types/node": {
+        "category": "Message",
+        "code": 6290
+    },
+    "Other Outputs": {
+        "category": "Message",
+        "code": 6291
+    },
+    "Stricter Typechecking Options": {
+        "category": "Message",
+        "code": 6292
+    },
+    "Style Options": {
+        "category": "Message",
+        "code": 6293
+    },
+    "Recommended Options": {
+        "category": "Message",
+        "code": 6294
+    },
 
     "Enable project compilation": {
         "category": "Message",
 
@@ -48,7 +48,6 @@ import {
     formatMessage,
     generateTSConfig,
     getBuildOrderFromAnyBuildOrder,
-    getCompilerOptionsDiffValue,
     getConfigFileParsingDiagnostics,
     getDiagnosticText,
     getErrorSummaryText,
@@ -574,7 +573,7 @@ function executeCommandLineWorker(
     }
 
     if (commandLine.options.init) {
-        writeConfigFile(sys, reportDiagnostic, commandLine.options, commandLine.fileNames);
+        writeConfigFile(sys, reportDiagnostic, commandLine.options);
         return sys.exit(ExitStatus.Success);
     }
 
@@ -1277,17 +1276,15 @@ function writeConfigFile(
     sys: System,
     reportDiagnostic: DiagnosticReporter,
     options: CompilerOptions,
-    fileNames: string[],
 ) {
     const currentDirectory = sys.getCurrentDirectory();
     const file = normalizePath(combinePaths(currentDirectory, "tsconfig.json"));
     if (sys.fileExists(file)) {
         reportDiagnostic(createCompilerDiagnostic(Diagnostics.A_tsconfig_json_file_is_already_defined_at_Colon_0, file));
     }
     else {
-        sys.writeFile(file, generateTSConfig(options, fileNames, sys.newLine));
-        const output: string[] = [sys.newLine, ...getHeader(sys, "Created a new tsconfig.json with:")];
-        output.push(getCompilerOptionsDiffValue(options, sys.newLine) + sys.newLine + sys.newLine);
+        sys.writeFile(file, generateTSConfig(options, sys.newLine));
+        const output: string[] = [sys.newLine, ...getHeader(sys, "Created a new tsconfig.json")];
         output.push(`You can learn more at https://aka.ms/tsconfig` + sys.newLine);
         for (const line of output) {
             sys.write(line);
 
@@ -5,7 +5,7 @@ describe("unittests:: config:: initTSConfig", () => {
     function initTSConfigCorrectly(name: string, commandLinesArgs: string[]) {
         describe(name, () => {
             const commandLine = ts.parseCommandLine(commandLinesArgs);
-            const initResult = ts.generateTSConfig(commandLine.options, commandLine.fileNames, "\n");
+            const initResult = ts.generateTSConfig(commandLine.options, "\n");
             const outputFileName = `config/initTSConfig/${name.replace(/[^a-z0-9\-. ]/gi, "")}/tsconfig.json`;
 
             it(`Correct output for ${outputFileName}`, () => {