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Remove no-default-lib #62435

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c04133d
Remove no-default-lib support
jakebailey Sep 12, 2025
db2decd
Update baselines
jakebailey Sep 12, 2025
7675ba5
Move libFiles.add
jakebailey Sep 12, 2025
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2 changes: 1 addition & 1 deletion Herebyfile.mjs
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,7 @@ const libs = memoize(() => {
/** @type {{ libs: string[]; paths: Record<string, string | undefined>; }} */
const libraries = readJson("./src/lib/libs.json");
const libs = libraries.libs.map(lib => {
const relativeSources = ["header.d.ts", lib + ".d.ts"];
const relativeSources = [lib + ".d.ts"];
const relativeTarget = libraries.paths && libraries.paths[lib] || ("lib." + lib + ".d.ts");
const sources = relativeSources.map(s => path.posix.join("src/lib", s));
const target = `built/local/${relativeTarget}`;
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2 changes: 1 addition & 1 deletion src/compiler/builder.ts
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Expand Up @@ -412,7 +412,7 @@ function createBuilderProgramState(

if (canCopySemanticDiagnostics) {
if (sourceFile.isDeclarationFile && !copyDeclarationFileDiagnostics) return;
if (sourceFile.hasNoDefaultLib && !copyLibFileDiagnostics) return;
if (newProgram.isSourceFileDefaultLibrary(sourceFile) && !copyLibFileDiagnostics) return;

// Unchanged file copy diagnostics
const diagnostics = oldState!.semanticDiagnosticsPerFile.get(sourceFilePath);
Expand Down
4 changes: 2 additions & 2 deletions src/compiler/checker.ts
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Expand Up @@ -21504,15 +21504,15 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
let issuedElaboration = false;
if (!targetProp) {
const indexInfo = getApplicableIndexInfo(target, nameType);
if (indexInfo && indexInfo.declaration && !getSourceFileOfNode(indexInfo.declaration).hasNoDefaultLib) {
if (indexInfo && indexInfo.declaration && !host.isSourceFileDefaultLibrary(getSourceFileOfNode(indexInfo.declaration))) {
issuedElaboration = true;
addRelatedInfo(reportedDiag, createDiagnosticForNode(indexInfo.declaration, Diagnostics.The_expected_type_comes_from_this_index_signature));
}
}

if (!issuedElaboration && (targetProp && length(targetProp.declarations) || target.symbol && length(target.symbol.declarations))) {
const targetNode = targetProp && length(targetProp.declarations) ? targetProp.declarations![0] : target.symbol.declarations![0];
if (!getSourceFileOfNode(targetNode).hasNoDefaultLib) {
if (!host.isSourceFileDefaultLibrary(getSourceFileOfNode(targetNode))) {
addRelatedInfo(
reportedDiag,
createDiagnosticForNode(
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10 changes: 3 additions & 7 deletions src/compiler/emitter.ts
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Expand Up @@ -4286,18 +4286,14 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
}

function emitSyntheticTripleSlashReferencesIfNeeded(node: Bundle) {
emitTripleSlashDirectives(!!node.hasNoDefaultLib, node.syntheticFileReferences || [], node.syntheticTypeReferences || [], node.syntheticLibReferences || []);
emitTripleSlashDirectives(node.syntheticFileReferences || [], node.syntheticTypeReferences || [], node.syntheticLibReferences || []);
}

function emitTripleSlashDirectivesIfNeeded(node: SourceFile) {
if (node.isDeclarationFile) emitTripleSlashDirectives(node.hasNoDefaultLib, node.referencedFiles, node.typeReferenceDirectives, node.libReferenceDirectives);
if (node.isDeclarationFile) emitTripleSlashDirectives(node.referencedFiles, node.typeReferenceDirectives, node.libReferenceDirectives);
}

function emitTripleSlashDirectives(hasNoDefaultLib: boolean, files: readonly FileReference[], types: readonly FileReference[], libs: readonly FileReference[]) {
if (hasNoDefaultLib) {
writeComment(`/// <reference no-default-lib="true"/>`);
writeLine();
}
function emitTripleSlashDirectives(files: readonly FileReference[], types: readonly FileReference[], libs: readonly FileReference[]) {
if (currentSourceFile && currentSourceFile.moduleName) {
writeComment(`/// <amd-module name="${currentSourceFile.moduleName}" />`);
writeLine();
Expand Down
6 changes: 2 additions & 4 deletions src/compiler/factory/nodeFactory.ts
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Expand Up @@ -6181,16 +6181,15 @@ export function createNodeFactory(flags: NodeFactoryFlags, baseFactory: BaseNode
isDeclarationFile = node.isDeclarationFile,
referencedFiles = node.referencedFiles,
typeReferenceDirectives = node.typeReferenceDirectives,
hasNoDefaultLib = node.hasNoDefaultLib,
_hasNoDefaultLib = false,
libReferenceDirectives = node.libReferenceDirectives,
) {
return node.statements !== statements
|| node.isDeclarationFile !== isDeclarationFile
|| node.referencedFiles !== referencedFiles
|| node.typeReferenceDirectives !== typeReferenceDirectives
|| node.hasNoDefaultLib !== hasNoDefaultLib
|| node.libReferenceDirectives !== libReferenceDirectives
? update(cloneSourceFileWithChanges(node, statements, isDeclarationFile, referencedFiles, typeReferenceDirectives, hasNoDefaultLib, libReferenceDirectives), node)
? update(cloneSourceFileWithChanges(node, statements, isDeclarationFile, referencedFiles, typeReferenceDirectives, /*hasNoDefaultLib*/ false, libReferenceDirectives), node)
: node;
}

Expand All @@ -6201,7 +6200,6 @@ export function createNodeFactory(flags: NodeFactoryFlags, baseFactory: BaseNode
node.syntheticFileReferences = undefined;
node.syntheticTypeReferences = undefined;
node.syntheticLibReferences = undefined;
node.hasNoDefaultLib = undefined;
return node;
}

Expand Down
3 changes: 1 addition & 2 deletions src/compiler/parser.ts
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Expand Up @@ -10617,7 +10617,6 @@ export function processPragmasIntoFields(context: PragmaContext, reportDiagnosti
context.typeReferenceDirectives = [];
context.libReferenceDirectives = [];
context.amdDependencies = [];
context.hasNoDefaultLib = false;
context.pragmas!.forEach((entryOrList, key) => { // TODO: GH#18217
// TODO: The below should be strongly type-guarded and not need casts/explicit annotations, since entryOrList is related to
// key and key is constrained to a union; but it's not (see GH#21483 for at least partial fix) :(
Expand All @@ -10630,7 +10629,7 @@ export function processPragmasIntoFields(context: PragmaContext, reportDiagnosti
const { types, lib, path, ["resolution-mode"]: res, preserve: _preserve } = arg.arguments;
const preserve = _preserve === "true" ? true : undefined;
if (arg.arguments["no-default-lib"] === "true") {
context.hasNoDefaultLib = true;
// This has been removed; parse but ignore it.
}
else if (types) {
const parsed = parseResolutionMode(res, types.pos, types.end, reportDiagnostic);
Expand Down
50 changes: 18 additions & 32 deletions src/compiler/program.ts
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Expand Up @@ -1577,7 +1577,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
const host = createProgramOptionsHost || createCompilerHost(options);
const configParsingHost = parseConfigHostFromCompilerHostLike(host);

let skipDefaultLib = options.noLib;
const getDefaultLibraryFileName = memoize(() => host.getDefaultLibFileName(options));
const defaultLibraryPath = host.getDefaultLibLocation ? host.getDefaultLibLocation() : getDirectoryPath(getDefaultLibraryFileName());

Expand Down Expand Up @@ -1708,6 +1707,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
* - undefined otherwise
*/
const filesByName = new Map<Path, SourceFile | false | undefined>();
const libFiles = new Set<Path>();
let missingFileNames = new Map<Path, string>();
// stores 'filename -> file association' ignoring case
// used to track cases when two file names differ only in casing
Expand Down Expand Up @@ -1779,7 +1779,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
}

tracing?.push(tracing.Phase.Program, "processRootFiles", { count: rootNames.length });
forEach(rootNames, (name, index) => processRootFile(name, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, { kind: FileIncludeKind.RootFile, index }));
forEach(rootNames, (name, index) => processRootFile(name, /*isDefaultLib*/ false, { kind: FileIncludeKind.RootFile, index }));
tracing?.pop();

// load type declarations specified via 'types' argument or implicitly from types/ and node_modules/@types folders
Expand Down Expand Up @@ -1808,20 +1808,16 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
tracing?.pop();
}

// Do not process the default library if:
// - The '--noLib' flag is used.
// - A 'no-default-lib' reference comment is encountered in
// processing the root files.
if (rootNames.length && !skipDefaultLib) {
if (rootNames.length && !options.noLib) {
// If '--lib' is not specified, include default library file according to '--target'
// otherwise, using options specified in '--lib' instead of '--target' default library file
const defaultLibraryFileName = getDefaultLibraryFileName();
if (!options.lib && defaultLibraryFileName) {
processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false, { kind: FileIncludeKind.LibFile });
processRootFile(defaultLibraryFileName, /*isDefaultLib*/ true, { kind: FileIncludeKind.LibFile });
}
else {
forEach(options.lib, (libFileName, index) => {
processRootFile(pathForLibFile(libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ false, { kind: FileIncludeKind.LibFile, index });
processRootFile(pathForLibFile(libFileName), /*isDefaultLib*/ true, { kind: FileIncludeKind.LibFile, index });
});
}
}
Expand Down Expand Up @@ -2453,11 +2449,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
// 'lib' references has changed. Matches behavior in changesAffectModuleResolution
structureIsReused = StructureIsReused.SafeModules;
}
else if (oldSourceFile.hasNoDefaultLib !== newSourceFile.hasNoDefaultLib) {
// value of no-default-lib has changed
// this will affect if default library is injected into the list of files
structureIsReused = StructureIsReused.SafeModules;
}
// check tripleslash references
else if (!arrayIsEqualTo(oldSourceFile.referencedFiles, newSourceFile.referencedFiles, fileReferenceIsEqualTo)) {
// tripleslash references has changed
Expand Down Expand Up @@ -2687,7 +2678,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
return false;
}

if (file.hasNoDefaultLib) {
if (libFiles.has(file.path)) {
return true;
}

Expand All @@ -2703,7 +2694,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
}
else {
return some(options.lib, libFileName => {
// We might not have resolved lib if one of the root file included contained no-default-lib = true
const resolvedLib = resolvedLibReferences!.get(libFileName);
return !!resolvedLib && equalityComparer(file.fileName, resolvedLib.actual);
});
Expand Down Expand Up @@ -3317,8 +3307,8 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
return configFileParsingDiagnostics || emptyArray;
}

function processRootFile(fileName: string, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, reason: FileIncludeReason) {
processSourceFile(normalizePath(fileName), isDefaultLib, ignoreNoDefaultLib, /*packageId*/ undefined, reason);
function processRootFile(fileName: string, isDefaultLib: boolean, reason: FileIncludeReason) {
processSourceFile(normalizePath(fileName), isDefaultLib, /*packageId*/ undefined, reason);
}

function fileReferenceIsEqualTo(a: FileReference, b: FileReference): boolean {
Expand Down Expand Up @@ -3512,17 +3502,17 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
}

/** This has side effects through `findSourceFile`. */
function processSourceFile(fileName: string, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, packageId: PackageId | undefined, reason: FileIncludeReason): void {
function processSourceFile(fileName: string, isDefaultLib: boolean, packageId: PackageId | undefined, reason: FileIncludeReason): void {
getSourceFileFromReferenceWorker(
fileName,
fileName => findSourceFile(fileName, isDefaultLib, ignoreNoDefaultLib, reason, packageId), // TODO: GH#18217
fileName => findSourceFile(fileName, isDefaultLib, reason, packageId), // TODO: GH#18217
(diagnostic, ...args) => addFilePreprocessingFileExplainingDiagnostic(/*file*/ undefined, reason, diagnostic, args),
reason,
);
}

function processProjectReferenceFile(fileName: string, reason: ProjectReferenceFile) {
return processSourceFile(fileName, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, /*packageId*/ undefined, reason);
return processSourceFile(fileName, /*isDefaultLib*/ false, /*packageId*/ undefined, reason);
}

function reportFileNamesDifferOnlyInCasingError(fileName: string, existingFile: SourceFile, reason: FileIncludeReason): void {
Expand All @@ -3548,13 +3538,13 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
}

// Get source file from normalized fileName
function findSourceFile(fileName: string, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, reason: FileIncludeReason, packageId: PackageId | undefined): SourceFile | undefined {
function findSourceFile(fileName: string, isDefaultLib: boolean, reason: FileIncludeReason, packageId: PackageId | undefined): SourceFile | undefined {
tracing?.push(tracing.Phase.Program, "findSourceFile", {
fileName,
isDefaultLib: isDefaultLib || undefined,
fileIncludeKind: (FileIncludeKind as any)[reason.kind],
});
const result = findSourceFileWorker(fileName, isDefaultLib, ignoreNoDefaultLib, reason, packageId);
const result = findSourceFileWorker(fileName, isDefaultLib, reason, packageId);
tracing?.pop();
return result;
}
Expand All @@ -3571,7 +3561,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
{ languageVersion, impliedNodeFormat: result, setExternalModuleIndicator, jsDocParsingMode: host.jsDocParsingMode };
}

function findSourceFileWorker(fileName: string, isDefaultLib: boolean, ignoreNoDefaultLib: boolean, reason: FileIncludeReason, packageId: PackageId | undefined): SourceFile | undefined {
function findSourceFileWorker(fileName: string, isDefaultLib: boolean, reason: FileIncludeReason, packageId: PackageId | undefined): SourceFile | undefined {
const path = toPath(fileName);
if (useSourceOfProjectReferenceRedirect) {
let source = getRedirectFromOutput(path);
Expand All @@ -3590,7 +3580,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
if (realPath !== path) source = getRedirectFromOutput(realPath);
}
if (source?.source) {
const file = findSourceFile(source.source, isDefaultLib, ignoreNoDefaultLib, reason, packageId);
const file = findSourceFile(source.source, isDefaultLib, reason, packageId);
if (file) addFileToFilesByName(file, path, fileName, /*redirectedPath*/ undefined);
return file;
}
Expand Down Expand Up @@ -3712,8 +3702,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
}
}

skipDefaultLib = skipDefaultLib || (file.hasNoDefaultLib && !ignoreNoDefaultLib);

if (!options.noResolve) {
processReferencedFiles(file, isDefaultLib);
processTypeReferenceDirectives(file);
Expand Down Expand Up @@ -3793,7 +3781,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
processSourceFile(
resolveTripleslashReference(ref.fileName, file.fileName),
isDefaultLib,
/*ignoreNoDefaultLib*/ false,
/*packageId*/ undefined,
{ kind: FileIncludeKind.ReferenceFile, file: file.path, index },
);
Expand Down Expand Up @@ -3846,7 +3833,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
if (resolvedTypeReferenceDirective.isExternalLibraryImport) currentNodeModulesDepth++;

// resolved from the primary path
processSourceFile(resolvedTypeReferenceDirective.resolvedFileName!, /*isDefaultLib*/ false, /*ignoreNoDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, reason); // TODO: GH#18217
processSourceFile(resolvedTypeReferenceDirective.resolvedFileName!, /*isDefaultLib*/ false, resolvedTypeReferenceDirective.packageId, reason); // TODO: GH#18217

if (resolvedTypeReferenceDirective.isExternalLibraryImport) currentNodeModulesDepth--;
}
Expand All @@ -3860,6 +3847,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
if (existing) return existing.actual;
const result = pathForLibFileWorker(libFileName);
(resolvedLibReferences ??= new Map()).set(libFileName, result);
libFiles.add(toPath(result.actual));
return result.actual;
}

Expand Down Expand Up @@ -3924,8 +3912,7 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
forEach(file.libReferenceDirectives, (libReference, index) => {
const libFileName = getLibFileNameFromLibReference(libReference);
if (libFileName) {
// we ignore any 'no-default-lib' reference set on this file.
processRootFile(pathForLibFile(libFileName), /*isDefaultLib*/ true, /*ignoreNoDefaultLib*/ true, { kind: FileIncludeKind.LibReferenceDirective, file: file.path, index });
processRootFile(pathForLibFile(libFileName), /*isDefaultLib*/ true, { kind: FileIncludeKind.LibReferenceDirective, file: file.path, index });
}
else {
programDiagnostics.addFileProcessingDiagnostic({
Expand Down Expand Up @@ -3995,7 +3982,6 @@ export function createProgram(_rootNamesOrOptions: readonly string[] | CreatePro
findSourceFile(
resolvedFileName,
/*isDefaultLib*/ false,
/*ignoreNoDefaultLib*/ false,
{ kind: FileIncludeKind.Import, file: file.path, index },
resolution.packageId,
);
Expand Down
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