Build Tools: Update TypeScript to 6.0.2#77010
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manzoorwanijk merged 7 commits intotrunkfrom Apr 2, 2026
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Add generic `*.css` and `*.scss` ambient module declarations alongside the existing `*.module.css` and `*.module.scss` declarations. TypeScript 6 introduces TS2882 which errors on side-effect imports of stylesheets without type declarations. Also update all tsconfig references to use the new name.
TypeScript 6 includes proper typings for `Intl.Locale.getTextInfo()`, making the `@ts-expect-error` directive unused (TS2578). Use optional chaining as a runtime fallback for older browsers.
Add --ignoreConfig flag (TS6 errors when tsconfig.json exists and files are passed on CLI) and switch --moduleResolution from deprecated node10 to bundler.
The esModuleInterop option is deprecated in TypeScript 6. The default value is already false, so removing it preserves existing behavior.
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Size Change: -2 B (0%) Total Size: 7.74 MB
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Flaky tests detected in 0735e45. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/23916347646
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Auto-generated docs reflect minor type signature differences in TS6 (e.g. parenthesized function types, explicit null/undefined unions).
aduth
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Co-authored-by: Andrew Duthie <1779930+aduth@users.noreply.github.com>
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* Build Tools: Update TypeScript from 5.9.3 to 6.0.2 * Build Tools: Rename typings/css-modules to typings/style-imports Add generic `*.css` and `*.scss` ambient module declarations alongside the existing `*.module.css` and `*.module.scss` declarations. TypeScript 6 introduces TS2882 which errors on side-effect imports of stylesheets without type declarations. Also update all tsconfig references to use the new name. * Components: Remove @ts-expect-error for Intl.Locale.getTextInfo TypeScript 6 includes proper typings for `Intl.Locale.getTextInfo()`, making the `@ts-expect-error` directive unused (TS2578). Use optional chaining as a runtime fallback for older browsers. * Build Tools: Fix type declaration check script for TypeScript 6 Add --ignoreConfig flag (TS6 errors when tsconfig.json exists and files are passed on CLI) and switch --moduleResolution from deprecated node10 to bundler. * Build Tools: Remove deprecated esModuleInterop from tsconfig The esModuleInterop option is deprecated in TypeScript 6. The default value is already false, so removing it preserves existing behavior. * Components: Regenerate README docs for TypeScript 6 type changes Auto-generated docs reflect minor type signature differences in TS6 (e.g. parenthesized function types, explicit null/undefined unions). * Remove unnecessary optional chaining --------- Co-authored-by: manzoorwanijk <manzoorwanijk@git.wordpress.org> Co-authored-by: aduth <aduth@git.wordpress.org>
jsnajdr
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Apr 7, 2026
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| declare module '*.css'; | ||
| declare module '*.scss'; |
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| "moduleResolution": "bundler", | ||
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| /* This needs to be false so our types are possible to consume without setting this */ | ||
| "esModuleInterop": false, |
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We still have some esModuleInterop: true declaration in a few tsconfig.base.json. If this option is going to be completely removed in TS 7.0, we should remove them, too. So that we are prepared.
adamsilverstein
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Apr 7, 2026
* Build Tools: Update TypeScript from 5.9.3 to 6.0.2 * Build Tools: Rename typings/css-modules to typings/style-imports Add generic `*.css` and `*.scss` ambient module declarations alongside the existing `*.module.css` and `*.module.scss` declarations. TypeScript 6 introduces TS2882 which errors on side-effect imports of stylesheets without type declarations. Also update all tsconfig references to use the new name. * Components: Remove @ts-expect-error for Intl.Locale.getTextInfo TypeScript 6 includes proper typings for `Intl.Locale.getTextInfo()`, making the `@ts-expect-error` directive unused (TS2578). Use optional chaining as a runtime fallback for older browsers. * Build Tools: Fix type declaration check script for TypeScript 6 Add --ignoreConfig flag (TS6 errors when tsconfig.json exists and files are passed on CLI) and switch --moduleResolution from deprecated node10 to bundler. * Build Tools: Remove deprecated esModuleInterop from tsconfig The esModuleInterop option is deprecated in TypeScript 6. The default value is already false, so removing it preserves existing behavior. * Components: Regenerate README docs for TypeScript 6 type changes Auto-generated docs reflect minor type signature differences in TS6 (e.g. parenthesized function types, explicit null/undefined unions). * Remove unnecessary optional chaining --------- Co-authored-by: manzoorwanijk <manzoorwanijk@git.wordpress.org> Co-authored-by: aduth <aduth@git.wordpress.org>
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What?
Supersedes #77009
Update TypeScript from 5.9.3 to 6.0.2 and fix all resulting build issues.
Why?
TypeScript 6 is the latest stable major version, bringing improved type checking (e.g. proper
Intl.Locale.getTextInfo()typings), stricter side-effect import validation, and deprecation of legacy options.How?
package.json.typings/css-modules→typings/style-imports— add generic*.cssand*.scssambient module declarations alongside the existing*.module.css/*.module.scssdeclarations. TS6 introduces TS2882 which errors on side-effect stylesheet imports without type declarations. Updated all tsconfig references.use-localization-props.ts— TS6 now typesIntl.Locale.getTextInfo(), making the@ts-expect-errordirective unused (TS2578). Use optional chaining as a runtime fallback.check-build-type-declaration-files.js— add--ignoreConfigflag (TS6 TS5112) and switch--moduleResolutionfrom deprecatednode10tobundler.esModuleInterop: falsefromtsconfig.base.json— deprecated in TS6, default is alreadyfalse.Testing Instructions
npm run build— should complete successfully.npx tsc --noEmit— zero errors.tsconfig.jsonin an IDE — no deprecation warnings.Testing Instructions for Keyboard
N/A — no UI changes.
Use of AI Tools
This PR was authored with the assistance of Claude Code (claude-opus-4-6).