Fix --showConfig to show transitively implied options that vary from the default config

src/compiler/commandLineParser.ts

@@ -1,4 +1,5 @@
 import {
+    addToSeen,
     AlternateModeDiagnostics,
     append,
     arrayFrom,
@@ -2629,7 +2630,7 @@ export function convertToTSConfig(configParseResult: ParsedCommandLine, configFi
     const providedKeys = new Set(optionMap.keys());
     const impliedCompilerOptions: Record<string, CompilerOptionsValue> = {};
     for (const option in computedOptions) {
-        if (!providedKeys.has(option) && some(computedOptions[option].dependencies, dep => providedKeys.has(dep))) {
+        if (!providedKeys.has(option) && optionDependsOn(option, providedKeys)) {
             const implied = computedOptions[option].computeValue(configParseResult.options);
             const defaultValue = computedOptions[option].computeValue({});
             if (implied !== defaultValue) {
@@ -2641,6 +2642,18 @@ export function convertToTSConfig(configParseResult: ParsedCommandLine, configFi
     return config;
 }
 
+function optionDependsOn(option: string, dependsOn: Set<string>): boolean {
+    const seen = new Set<string>();
+    return optionDependsOnRecursive(option);
+
+    function optionDependsOnRecursive(option: string): boolean {
+        if (addToSeen(seen, option)) {
+            return some(computedOptions[option]?.dependencies, dep => dependsOn.has(dep) || optionDependsOnRecursive(dep));
+        }
+        return false;
+    }
+}
+
 /** @internal */
 export function optionMapToObject(optionMap: Map<string, CompilerOptionsValue>): object {
     return Object.fromEntries(optionMap);

src/compiler/utilities.ts

@@ -8193,15 +8193,11 @@ export function getLastChild(node: Node): Node | undefined {
  *
  * @internal
  */
-export function addToSeen<K>(seen: Map<K, true>, key: K): boolean;
-/** @internal */
-export function addToSeen<K, T>(seen: Map<K, T>, key: K, value: T): boolean;
-/** @internal */
-export function addToSeen<K, T>(seen: Map<K, T>, key: K, value: T = true as any): boolean {
+export function addToSeen<K>(seen: Set<K>, key: K): boolean {
     if (seen.has(key)) {
         return false;
     }
-    seen.set(key, value);
+    seen.add(key);
     return true;
 }
 

src/server/editorServices.ts

@@ -1297,7 +1297,7 @@ export class ProjectService {
      */
     private readonly filenameToScriptInfoVersion = new Map<Path, number>();
     // Set of all '.js' files ever opened.
-    private readonly allJsFilesForOpenFileTelemetry = new Map<string, true>();
+    private readonly allJsFilesForOpenFileTelemetry = new Set<string>();
 
     /**
      * Map to the real path of the infos

src/services/codefixes/convertConstToLet.ts

@@ -36,7 +36,7 @@ registerCodeFix({
     },
     getAllCodeActions: context => {
         const { program } = context;
-        const seen = new Map<number, true>();
+        const seen = new Set<number>();
 
         return createCombinedCodeActions(textChanges.ChangeTracker.with(context, changes => {
             eachDiagnostic(context, errorCodes, diag => {

src/services/codefixes/convertToTypeOnlyExport.ts

@@ -36,7 +36,7 @@ registerCodeFix({
     },
     fixIds: [fixId],
     getAllCodeActions: function getAllCodeActionsToConvertToTypeOnlyExport(context) {
-        const fixedExportDeclarations = new Map<number, true>();
+        const fixedExportDeclarations = new Set<number>();
         return codeFixAll(context, errorCodes, (changes, diag) => {
             const exportSpecifier = getExportSpecifierForDiagnosticSpan(diag, context.sourceFile);
             if (exportSpecifier && addToSeen(fixedExportDeclarations, getNodeId(exportSpecifier.parent.parent))) {

src/services/codefixes/fixAddMissingConstraint.ts

@@ -63,7 +63,7 @@ registerCodeFix({
     fixIds: [fixId],
     getAllCodeActions: context => {
         const { program, preferences, host } = context;
-        const seen = new Map<number, true>();
+        const seen = new Set<number>();
 
         return createCombinedCodeActions(textChanges.ChangeTracker.with(context, changes => {
             eachDiagnostic(context, errorCodes, diag => {

src/services/codefixes/fixAddMissingMember.ts

@@ -182,7 +182,7 @@ registerCodeFix({
     getAllCodeActions: context => {
         const { program, fixId } = context;
         const checker = program.getTypeChecker();
-        const seen = new Map<string, true>();
+        const seen = new Set<string>();
         const typeDeclToMembers = new Map<ClassLikeDeclaration | InterfaceDeclaration | TypeLiteralNode, TypeLikeDeclarationInfo[]>();
 
         return createCombinedCodeActions(textChanges.ChangeTracker.with(context, changes => {

src/services/codefixes/fixAwaitInSyncFunction.ts

@@ -44,7 +44,7 @@ registerCodeFix({
     },
     fixIds: [fixId],
     getAllCodeActions: function getAllCodeActionsToFixAwaitInSyncFunction(context) {
-        const seen = new Map<number, true>();
+        const seen = new Set<number>();
         return codeFixAll(context, errorCodes, (changes, diag) => {
             const nodes = getNodes(diag.file, diag.start);
             if (!nodes || !addToSeen(seen, getNodeId(nodes.insertBefore))) return;

src/services/codefixes/fixClassDoesntImplementInheritedAbstractMember.ts

@@ -44,7 +44,7 @@ registerCodeFix({
     },
     fixIds: [fixId],
     getAllCodeActions: function getAllCodeActionsToFixClassDoesntImplementInheritedAbstractMember(context) {
-        const seenClassDeclarations = new Map<number, true>();
+        const seenClassDeclarations = new Set<number>();
         return codeFixAll(context, errorCodes, (changes, diag) => {
             const classDeclaration = getClass(diag.file, diag.start);
             if (addToSeen(seenClassDeclarations, getNodeId(classDeclaration))) {

src/services/codefixes/fixClassIncorrectlyImplementsInterface.ts

@@ -55,7 +55,7 @@ registerCodeFix({
     },
     fixIds: [fixId],
     getAllCodeActions(context) {
-        const seenClassDeclarations = new Map<number, true>();
+        const seenClassDeclarations = new Set<number>();
         return codeFixAll(context, errorCodes, (changes, diag) => {
             const classDeclaration = getClass(diag.file, diag.start);
             if (addToSeen(seenClassDeclarations, getNodeId(classDeclaration))) {

src/services/codefixes/fixClassSuperMustPrecedeThisAccess.ts

@@ -38,7 +38,7 @@ registerCodeFix({
     fixIds: [fixId],
     getAllCodeActions(context) {
         const { sourceFile } = context;
-        const seenClasses = new Map<number, true>(); // Ensure we only do this once per class.
+        const seenClasses = new Set<number>(); // Ensure we only do this once per class.
         return codeFixAll(context, errorCodes, (changes, diag) => {
             const nodes = getNodes(diag.file, diag.start);
             if (!nodes) return;

src/services/completions.ts

@@ -3585,7 +3585,7 @@ function getCompletionData(
     let importSpecifierResolver: codefix.ImportSpecifierResolver | undefined;
     const symbolToOriginInfoMap: SymbolOriginInfoMap = [];
     const symbolToSortTextMap: SymbolSortTextMap = [];
-    const seenPropertySymbols = new Map<SymbolId, true>();
+    const seenPropertySymbols = new Set<SymbolId>();
     const isTypeOnlyLocation = isTypeOnlyCompletion();
     const getModuleSpecifierResolutionHost = memoizeOne((isFromPackageJson: boolean) => {
         return createModuleSpecifierResolutionHost(isFromPackageJson ? host.getPackageJsonAutoImportProvider!()! : program, host);
@@ -6051,14 +6051,14 @@ function isArrowFunctionBody(node: Node) {
 }
 
 /** True if symbol is a type or a module containing at least one type. */
-function symbolCanBeReferencedAtTypeLocation(symbol: Symbol, checker: TypeChecker, seenModules = new Map<SymbolId, true>()): boolean {
+function symbolCanBeReferencedAtTypeLocation(symbol: Symbol, checker: TypeChecker, seenModules = new Set<Symbol>()): boolean {
     // Since an alias can be merged with a local declaration, we need to test both the alias and its target.
     // This code used to just test the result of `skipAlias`, but that would ignore any locally introduced meanings.
     return nonAliasCanBeReferencedAtTypeLocation(symbol) || nonAliasCanBeReferencedAtTypeLocation(skipAlias(symbol.exportSymbol || symbol, checker));
 
     function nonAliasCanBeReferencedAtTypeLocation(symbol: Symbol): boolean {
         return !!(symbol.flags & SymbolFlags.Type) || checker.isUnknownSymbol(symbol) ||
-            !!(symbol.flags & SymbolFlags.Module) && addToSeen(seenModules, getSymbolId(symbol)) &&
+            !!(symbol.flags & SymbolFlags.Module) && addToSeen(seenModules, symbol) &&
                 checker.getExportsOfModule(symbol).some(e => symbolCanBeReferencedAtTypeLocation(e, checker, seenModules));
     }
 }

src/services/exportInfoMap.ts

@@ -555,7 +555,7 @@ export function getExportInfoMap(importingFile: SourceFile | FutureSourceFile, h
     try {
         forEachExternalModuleToImportFrom(program, host, preferences, /*useAutoImportProvider*/ true, (moduleSymbol, moduleFile, program, isFromPackageJson) => {
             if (++moduleCount % 100 === 0) cancellationToken?.throwIfCancellationRequested();
-            const seenExports = new Map<__String, true>();
+            const seenExports = new Set<__String>();
             const checker = program.getTypeChecker();
             const defaultInfo = getDefaultLikeExportInfo(moduleSymbol, checker);
             // Note: I think we shouldn't actually see resolved module symbols here, but weird merges
@@ -634,7 +634,7 @@ function getNamesForExportedSymbol(defaultExport: Symbol, checker: TypeChecker,
 export function forEachNameOfDefaultExport<T>(defaultExport: Symbol, checker: TypeChecker, scriptTarget: ScriptTarget | undefined, cb: (name: string, capitalizedName?: string) => T | undefined): T | undefined {
     let chain: Symbol[] | undefined;
     let current: Symbol | undefined = defaultExport;
-    const seen = new Map<Symbol, true>();
+    const seen = new Set<Symbol>();
 
     while (current) {
         // The predecessor to this function also looked for a name on the `localSymbol`

src/services/findAllReferences.ts

@@ -251,7 +251,6 @@ import {
     SymbolDisplayPart,
     SymbolDisplayPartKind,
     SymbolFlags,
-    SymbolId,
     symbolName,
     SyntaxKind,
     textPart,
@@ -544,7 +543,7 @@ export function getImplementationsAtPosition(program: Program, cancellationToken
     }
     else if (entries) {
         const queue = createQueue(entries);
-        const seenNodes = new Map<number, true>();
+        const seenNodes = new Set<number>();
         while (!queue.isEmpty()) {
             const entry = queue.dequeue() as NodeEntry;
             if (!addToSeen(seenNodes, getNodeId(entry.node))) {
@@ -2666,15 +2665,15 @@ export namespace Core {
      *                                The value of previousIterationSymbol is undefined when the function is first called.
      */
     function getPropertySymbolsFromBaseTypes<T>(symbol: Symbol, propertyName: string, checker: TypeChecker, cb: (symbol: Symbol) => T | undefined): T | undefined {
-        const seen = new Map<SymbolId, true>();
+        const seen = new Set<Symbol>();
         return recur(symbol);
 
         function recur(symbol: Symbol): T | undefined {
             // Use `addToSeen` to ensure we don't infinitely recurse in this situation:
             //      interface C extends C {
             //          /*findRef*/propName: string;
             //      }
-            if (!(symbol.flags & (SymbolFlags.Class | SymbolFlags.Interface)) || !addToSeen(seen, getSymbolId(symbol))) return;
+            if (!(symbol.flags & (SymbolFlags.Class | SymbolFlags.Interface)) || !addToSeen(seen, symbol)) return;
 
             return firstDefined(symbol.declarations, declaration =>
                 firstDefined(getAllSuperTypeNodes(declaration), typeReference => {

src/services/refactors/extractType.ts

@@ -247,7 +247,7 @@ function flattenTypeLiteralNodeReference(checker: TypeChecker, selection: TypeNo
     }
     if (isIntersectionTypeNode(selection)) {
         const result: TypeElement[] = [];
-        const seen = new Map<string, true>();
+        const seen = new Set<string>();
         for (const type of selection.types) {
             const flattenedTypeMembers = flattenTypeLiteralNodeReference(checker, type);
             if (!flattenedTypeMembers || !flattenedTypeMembers.every(type => type.name && addToSeen(seen, getNameFromPropertyName(type.name) as string))) {

src/services/stringCompletions.ts

@@ -555,7 +555,7 @@ function getAlreadyUsedTypesInStringLiteralUnion(union: UnionTypeNode, current:
 
 function getStringLiteralCompletionsFromSignature(call: CallLikeExpression, arg: StringLiteralLike, argumentInfo: SignatureHelp.ArgumentInfoForCompletions, checker: TypeChecker): StringLiteralCompletionsFromTypes | undefined {
     let isNewIdentifier = false;
-    const uniques = new Map<string, true>();
+    const uniques = new Set<string>();
     const editingArgument = isJsxOpeningLikeElement(call) ? Debug.checkDefined(findAncestor(arg.parent, isJsxAttribute)) : arg;
     const candidates = checker.getCandidateSignaturesForStringLiteralCompletions(call, editingArgument);
     const types = flatMap(candidates, candidate => {
@@ -600,7 +600,7 @@ function stringLiteralCompletionsForObjectLiteral(checker: TypeChecker, objectLi
     };
 }
 
-function getStringLiteralTypes(type: Type | undefined, uniques = new Map<string, true>()): readonly StringLiteralType[] {
+function getStringLiteralTypes(type: Type | undefined, uniques = new Set<string>()): readonly StringLiteralType[] {
     if (!type) return emptyArray;
     type = skipConstraint(type);
     return type.isUnion() ? flatMap(type.types, t => getStringLiteralTypes(t, uniques)) :

src/services/textChanges.ts

@@ -1,5 +1,4 @@
 import {
-    addToSeen,
     ArrowFunction,
     BindingElement,
     CharacterCodes,
@@ -493,7 +492,7 @@ export function isThisTypeAnnotatable(containingFunction: SignatureDeclaration):
 export class ChangeTracker {
     private readonly changes: Change[] = [];
     private newFileChanges?: MultiMap<string, NewFileInsertion>;
-    private readonly classesWithNodesInsertedAtStart = new Map<number, { readonly node: ClassLikeDeclaration | InterfaceDeclaration | ObjectLiteralExpression; readonly sourceFile: SourceFile; }>(); // Set<ClassDeclaration> implemented as Map<node id, ClassDeclaration>
+    private readonly classesWithNodesInsertedAtStart = new Map<number, { readonly node: ClassLikeDeclaration | InterfaceDeclaration | ObjectLiteralExpression | TypeLiteralNode | EnumDeclaration; readonly sourceFile: SourceFile; }>(); // Set<ClassDeclaration> implemented as Map<node id, ClassDeclaration>
     private readonly deletedNodes: { readonly sourceFile: SourceFile; readonly node: Node | NodeArray<TypeParameterDeclaration>; }[] = [];
 
     public static fromContext(context: TextChangesContext): ChangeTracker {
@@ -903,7 +902,10 @@ export class ChangeTracker {
 
         const members = getMembersOrProperties(node);
         const isEmpty = members.length === 0;
-        const isFirstInsertion = addToSeen(this.classesWithNodesInsertedAtStart, getNodeId(node), { node, sourceFile });
+        const isFirstInsertion = !this.classesWithNodesInsertedAtStart.has(getNodeId(node));
+        if (isFirstInsertion) {
+            this.classesWithNodesInsertedAtStart.set(getNodeId(node), { node, sourceFile });
+        }
         const insertTrailingComma = isObjectLiteralExpression(node) && (!isJsonSourceFile(sourceFile) || !isEmpty);
         const insertLeadingComma = isObjectLiteralExpression(node) && isJsonSourceFile(sourceFile) && isEmpty && !isFirstInsertion;
         return {
@@ -1246,7 +1248,7 @@ function endPositionToDeleteNodeInList(sourceFile: SourceFile, node: Node, prevN
     return end;
 }
 
-function getClassOrObjectBraceEnds(cls: ClassLikeDeclaration | InterfaceDeclaration | ObjectLiteralExpression, sourceFile: SourceFile): [number | undefined, number | undefined] {
+function getClassOrObjectBraceEnds(cls: ClassLikeDeclaration | InterfaceDeclaration | ObjectLiteralExpression | TypeLiteralNode | EnumDeclaration, sourceFile: SourceFile): [number | undefined, number | undefined] {
     const open = findChildOfKind(cls, SyntaxKind.OpenBraceToken, sourceFile);
     const close = findChildOfKind(cls, SyntaxKind.CloseBraceToken, sourceFile);
     return [open?.end, close?.end];

src/testRunner/unittests/config/showConfig.ts

@@ -57,6 +57,8 @@ describe("unittests:: config:: showConfig", () => {
 
     showTSConfigCorrectly("Show TSConfig with advanced options", ["--showConfig", "--declaration", "--declarationDir", "lib", "--skipLibCheck", "--noErrorTruncation"]);
 
+    showTSConfigCorrectly("Show TSConfig with transitively implied options", ["--showConfig", "--module", "nodenext"]);
+
     showTSConfigCorrectly("Show TSConfig with compileOnSave and more", ["-p", "tsconfig.json"], {
         compilerOptions: {
             esModuleInterop: true,

tests/baselines/reference/config/showConfig/Show TSConfig with transitively implied options/tsconfig.json

@@ -0,0 +1,13 @@
+{
+    "compilerOptions": {
+        "module": "nodenext",
+        "target": "esnext",
+        "moduleResolution": "nodenext",
+        "moduleDetection": "force",
+        "esModuleInterop": true,
+        "allowSyntheticDefaultImports": true,
+        "resolvePackageJsonExports": true,
+        "resolvePackageJsonImports": true,
+        "useDefineForClassFields": true
+    }
+}