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chore: bump TypeScript from 5 to 7, and add TypeScript 6 side by side#9518

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chore: bump TypeScript from 5 to 7, and add TypeScript 6 side by side#9518
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@Mrtenz

@Mrtenz Mrtenz commented Jul 15, 2026

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Explanation

The monorepo was previously on TypeScript 5 (~5.3.3). This PR bumps it to TypeScript 7 by aliasing typescript to npm:typescript@^7.0.2 (via @typescript/native) in all package.json files.

TypeScript 7.0 does not ship a JavaScript API (it uses a native Go binary instead), so tools that depend on the TypeScript JS API — such as ESLint — cannot use it directly. TypeScript 7.1 will restore the JS API, but until then TypeScript 6 is installed alongside TypeScript 7 under the @typescript/typescript6 alias so these tools continue to work in the interim.

Yarn is bumped from 4.16.0 to 4.17.1 because the previous version broke when applying the built-in TypeScript patch.

References

https://consensyssoftware.atlassian.net/browse/WPC-1158

Checklist

  • I've updated the test suite for new or updated code as appropriate
  • I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
  • I've communicated my changes to consumers by updating changelogs for packages I've changed
  • I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

Pin the `typescript` dev dependency to TypeScript 6 via the
`@typescript/typescript6` package alias, and add `@typescript/native`
as an alias for TypeScript 7. This allows incremental testing against
TypeScript 7 without disrupting the current TypeScript 6 build.

Also bump Yarn from 4.16.0 to 4.17.1 — the previous version
broke when applying the built-in TypeScript patch.
@socket-security

socket-security Bot commented Jul 15, 2026

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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security
Vulnerability Quality Maintenance License
Added@​typescript/​typescript6@​6.0.2621005592100
Updatedtypescript@​5.3.3 ⏵ 7.0.294 -610089 -1100 +5100 +10
Updatedtypescript@​5.3.3 ⏵ 6.0.310010090100 +590

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socket-security Bot commented Jul 15, 2026

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Caution

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Publisher changed: npm @typescript/typescript-aix-ppc64 is now published by microsoft1es

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Publisher changed: npm @typescript/typescript-netbsd-arm64 is now published by microsoft1es

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From: ?npm/typescript@7.0.2npm/@typescript/typescript-freebsd-x64@7.0.2

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Mrtenz added 2 commits July 15, 2026 13:39
Apply a Yarn patch to `@typescript/old` (TypeScript 6) so that `tsc`
resolves to TypeScript 7 and `tsc6` resolves to TypeScript 6. Without
the patch, a Yarn bug causes `tsc` to resolve to TypeScript 6.
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