Migrate repo to TypeScript 7 by jakebailey · Pull Request #63763 · microsoft/TypeScript

Jake Bailey (jakebailey) · 2026-08-20T00:09:42Z

This brings over the entirety of https://github.com/microsoft/typescript-go, returning main TypeScript development to the repo. See also: microsoft/typescript-go#4876

The entire typescript-go repo commit history has been replayed into this repo, preserving full git history, blame, authorship credit, the works. Repo references in commit messages have been rewritten to point to the correct repo, e.g. microsoft/typescript-go#1234.

To avoid incompatibility with our existing git tags, all of the code from that repo was replayed into a tsc subdirectory, which is now the main Go module. This nested module remains unversioned for the time being, and does not yet export any API.

The replayed history is then "merged" with main, deleting all of the old Strada code, save for files we want to keep like licenses, scripts, GHA workflows, and so on.

Then, on top of that merge commit, a few fixup commits rename imports, move files around, etc, to get things working again.

Most things should work the same, but some packages and tasks have been renamed.

This PR MUST be merged with a merge commit, otherwise all of the work to keep the history alive will be gone!

…t side (microsoft/typescript-go#4312)

…4326)

…o#4348)

…escript-go#4351)

…/typescript-go#4356)

…typescript-go#4377)

… across 1 directory (microsoft/typescript-go#4390) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

…soft/typescript-go#4355)

…ypescript-go#4394)

…n't `<` (microsoft/typescript-go#4234)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

…t/typescript-go#4063)

… to `bigint` in the API (microsoft/typescript-go#4344) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

…crosoft/typescript-go#4384)

…escript-go#4308)

…n types and signatures (microsoft/typescript-go#4341)

…ft/typescript-go#4367)

…script-go#4419) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com> Co-authored-by: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>

…typescript-go#4414)

…ipt-go#4402) Co-authored-by: Piotr Tomiak <piotr.tomiak@jetbrains.com>

…#4413)

…script-go#4360) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

…ft/typescript-go#4362) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

…oft/typescript-go#4389)

…pescript-go#4345) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

…-go#4421)

…onfig (microsoft/typescript-go#4429) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com>

Co-authored-by: Cold Fry <coldfry.business@gmail.com>

…cript-go#4889) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: weswigham <2932786+weswigham@users.noreply.github.com> Co-authored-by: Wesley Wigham <wwigham@gmail.com>

…script-go#4909) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com> Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

…t/typescript-go#4723) Co-authored-by: Jake Bailey <5341706+jakebailey@users.noreply.github.com> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Co-authored-by: Michael Arnaldi <michael.arnaldi@effectful.co>

…go#4900) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com> Co-authored-by: weswigham <2932786+weswigham@users.noreply.github.com>

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Andrew Branch (andrewbranch)

Welcome home, everyone 🚀

Piotr Tomiak (piotrtomiak) and others added 30 commits June 16, 2026 16:21

API: add Signature implementation and improve object caching on clien…

7c439dc

…t side (microsoft/typescript-go#4312)

Note tsc for RC and above in README.me (microsoft/typescript-go#4340)

2a49cdd

Rebuilt build mode around fswatch package (microsoft/typescript-go#…

48531e9

…4326)

Update NOTICE and ensure it's inside packages (microsoft/typescript-g…

1662314

…o#4348)

Deduplicate declaration emit for this-assigned methods (microsoft/typ…

99e5a1a

…escript-go#4351)

Re-allow nested cjs export assignments in declaration emit (microsoft…

706e876

…/typescript-go#4356)

Fix nil pointer panic when extending an empty config file (microsoft/…

4d44e1c

…typescript-go#4377)

Bump actions/checkout from 6.0.3 to 7.0.0 in the github-actions group…

ea0a252

… across 1 directory (microsoft/typescript-go#4390) Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

fix(4354): add tsconfig option errors from project diagnostics (micro…

436560c

…soft/typescript-go#4355)

Fix generated Is* guards for type-parameter-kinded nodes (microsoft/t…

82e8092

…ypescript-go#4394)

Skip mark/rewind in tryParseTypeArgumentsInExpression when token is…

fd13c05

…n't `<` (microsoft/typescript-go#4234)

Fix watches on symlinked directories (microsoft/typescript-go#4376)

481beae

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

Warn on TSServer Plugin Contributions from other extensions (microsof…

b709ea5

…t/typescript-go#4063)

Fix panic on non-string include/exclude/files in extended configs (mi…

c685966

…crosoft/typescript-go#4384)

API: add the missing position and text getters to Node (microsoft/typ…

85d76b1

…escript-go#4308)

API: make object registries project-specific to avoid id collisions o…

2e2c5a0

…n types and signatures (microsoft/typescript-go#4341)

Allow parameter type reuse even when return type is inferred (microso…

dd773ef

…ft/typescript-go#4367)

API: cache SourceFile text to heavily improve performance (microsoft/…

29537e3

…typescript-go#4414)

[api] Flesh out project/file open state management (microsoft/typescr…

7f8ee13

…ipt-go#4402) Co-authored-by: Piotr Tomiak <piotr.tomiak@jetbrains.com>

[api] Add missing program diagnostic getters (microsoft/typescript-go…

416baf9

…#4413)

Fix non-ASCII detection for source file position maps (microsoft/type…

85b1533

…script-go#4360) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

Fix ${configDir} path candidate resolving in extended config (microso…

5f7bf1b

…ft/typescript-go#4362) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

Prefer covariant inferences with deeper type argument nesting (micros…

3739854

…oft/typescript-go#4389)

Fix getBaseTypes panic on type reference instantiations (microsoft/ty…

c788c0d

…pescript-go#4345) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: andrewbranch <3277153+andrewbranch@users.noreply.github.com>

Add arguments inference removal to CHANGES.md (microsoft/typescript…

0def7df

…-go#4421)

Fix js/ts.reportStyleChecksAsWarnings not being read from VS Code c…

e31fb96

…onfig (microsoft/typescript-go#4429) Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: DanielRosenwasser <972891+DanielRosenwasser@users.noreply.github.com>

[api] Add missing checker methods (microsoft/typescript-go#4424)

409f598

Co-authored-by: Cold Fry <coldfry.business@gmail.com>

Fix CommonJS export destructuring emit (microsoft/typescript-go#4404)

9b047bf

Copilot AI and others added 7 commits August 18, 2026 23:44

Preserve comments when downleveling arrow expression bodies (microsof…

48be7ae

…t/typescript-go#4723) Co-authored-by: Jake Bailey <5341706+jakebailey@users.noreply.github.com> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

Content mappers (microsoft/typescript-go#4712)

57791fb

Co-authored-by: Michael Arnaldi <michael.arnaldi@effectful.co>

Generate TS API from Go source (microsoft/typescript-go#4915)

8d411ad

Fix test:api on windows (microsoft/typescript-go#4917)

51c91ec

Copilot AI lite review requested due to automatic review settings August 20, 2026 00:09

github-project-automation Bot added this to PR Backlog Aug 20, 2026

github-project-automation Bot moved this to Not started in PR Backlog Aug 20, 2026

typescript-automation Bot assigned Jake Bailey (jakebailey) Aug 20, 2026

typescript-automation Bot added Author: Team For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Aug 20, 2026

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Jake Bailey (jakebailey) requested a review from Ryan Cavanaugh (RyanCavanaugh) August 20, 2026 00:15

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Jake Bailey (jakebailey) requested review from Daniel Rosenwasser (DanielRosenwasser) and Anders Hejlsberg (ahejlsberg) August 20, 2026 00:25

Andrew Branch (andrewbranch) approved these changes Aug 20, 2026

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github-project-automation Bot moved this from Not started to Needs merge in PR Backlog Aug 20, 2026

Jake Bailey (jakebailey) added 4 commits August 19, 2026 18:20

Remove the historical TypeScript submodule

a78be1b

Rename the Go module to github.com/microsoft/TypeScript/tsc

28c68f4

Apply the TypeScript 7 repository layout

5f647a8

Ignore mechanical TypeScript 7 migration commits in blame

1ca4b27

Jake Bailey (jakebailey) force-pushed the main-ts7 branch from 01aa914 to 1ca4b27 Compare August 20, 2026 01:38

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Jake Bailey (jakebailey) requested a review from Andrew Branch (andrewbranch) August 20, 2026 02:12

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Migrate repo to TypeScript 7 - #63763

Migrate repo to TypeScript 7#63763
Jake Bailey (jakebailey) wants to merge 2495 commits into
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