feat: add es2026 as a valid target and lib - #64096
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Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
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feat: add es2026 as a valid target and lib#64096Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
Oleksandr Tarasiuk (a-tarasyuk) wants to merge 2 commits into
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Oleksandr Tarasiuk (a-tarasyuk)
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August 31, 2026 21:27
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Pull request overview
Adds ES2026 compiler-target and standard-library support, including the APIs requested by #63704.
Changes:
- Registers
es2026as a target, default standard target, and library. - Adds ES2026 API declarations and preserves
esnext.*aliases. - Adds conformance tests and refreshes generated baselines.
Reviewed changes
Copilot reviewed 136 out of 540 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
packages/typescript/src/enums/scriptTarget*.ts |
Exposes ES2026 publicly. |
packages/typescript/test/{async,sync}/api.test.ts |
Updates target diagnostics. |
tsc/internal/core/{compileroptions,scripttarget_stringer_generated}.go |
Defines and formats the target. |
tsc/internal/tsoptions/enummaps.go |
Registers target, libraries, and compatibility aliases. |
tsc/internal/transformers/estransforms/definitions.go |
Selects the ES2026 transform pipeline. |
tsc/internal/checker/utilities.go |
Adds ES2026 library suggestions. |
tsc/internal/bundled/libs/lib.es2026*.d.ts |
Defines the ES2026 library and APIs. |
tsc/internal/bundled/libs/lib.esnext.d.ts |
Makes ESNext inherit ES2026. |
tsc/internal/bundled/{embed_generated,libs_generated}.go |
Embeds and registers new libraries. |
tsc/internal/compiler/program_test.go |
Updates expected ESNext library ordering. |
tsc/testdata/fixtures/compiler/*.ts |
Synchronizes compiler fixtures. |
tsc/testdata/tests/cases/conformance/es2026/*.ts |
Tests ES2026 APIs and diagnostics. |
tsc/testdata/baselines/reference/** |
Refreshes generated compiler, build, watch, API, and conformance baselines. |
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Fixes #63704