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1. Commits on Oct 18, 2026

   • Cache undefined widening properties per symbol, not per name (#64728)

     Max Schwenk (maschwenk)

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2. Commits on Oct 17, 2026

   • Reduce the last ~2 years of uncovered top1000 repo failures into local tests (#64850)

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     Ryan Cavanaugh (RyanCavanaugh)

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3. Commits on Oct 16, 2026

   • Ensure `pathsBasePath` is correctly forwarded from the API (#64843)

     Titian Cernicova-Dragomir (dragomirtitian)

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   • [api] Add timing collection and dump via environment variable (#64846)

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     Andrew Branch (andrewbranch)

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   • Fix incremental diagnostics after global file deletion (#64845)

     John Favret (johnfav03)

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   • Allow CRLF line endings in release workflow whitespace checks (#64840)

     Jake Bailey (jakebailey)

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4. Commits on Oct 15, 2026

   • Escape quotes in synthesized module specifiers (#64839)

     Ryan Cavanaugh (RyanCavanaugh)

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   • Disable ATA when no user cache is available (#64836)

     Jake Bailey (jakebailey)

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   • Ban network paths wholesale (#64832)

     Jake Bailey (jakebailey)

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   • Fix release pipeline tests and workflow (#64831)

     Jake Bailey (jakebailey)

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   • Avoid weakset for executed generators (#64830)

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     Titian Cernicova-Dragomir (dragomirtitian)

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     Claude (claude)

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5. Commits on Oct 14, 2026

   • [api] Fix named pipe / UDS creation (#64818)

     Andrew Branch (andrewbranch)

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   • perf(checker): fast-path compareNodes for identical AST parent containers and use cmp.Compare (#64551)

     HazyLab (hazyhaar)

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   • Update localization files (#64764)

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     typescript-automation[bot]

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   • fix(64058): fix reparse jsdoc @extends type arguments for call expressions (#64072)

     Oleksandr Tarasiuk (a-tarasyuk)

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   • Reuse ordered property counts during intersection reduction (#64804)

     Jake Bailey (jakebailey)

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   • Use paged indexes for type-node and signature caches (#64803)

     Jake Bailey (jakebailey)

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   • Bound arena retention by bytes instead of object count (#64802)

     Jake Bailey (jakebailey)

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   • Keep optional type-node and signature state out of hot records (#64801)

     Jake Bailey (jakebailey)

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   • Move optional structured type shape into cold storage (#64800)

     Jake Bailey (jakebailey)

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   • Keep optional symbol tables out of hot symbol records (#64799)

     Jake Bailey (jakebailey)

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   • Recover concrete AST nodes from their embedded headers (#64798)

     Jake Bailey (jakebailey)

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   • Move cold value-symbol links out of the hot records (#64797)

     Jake Bailey (jakebailey)

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   • Compact type mappers and coallocate inference mapper storage (#64796)

     Jake Bailey (jakebailey)

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   • Avoid allocating normalized types on interning cache hits (#64795)

     Jake Bailey (jakebailey)

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   • Presize checker type-list cache keys (#64794)

     Jake Bailey (jakebailey)

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   • Batch allocations of common checker types (#64793)

     Jake Bailey (jakebailey)

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   • Compact checker type metadata (#64774)

     Jake Bailey (jakebailey)

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   • Replace nodeData interface with generated AST accessors (#64773)

     Jake Bailey (jakebailey)

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   • Add cache to `getSimplifiedConditionalType` (#64648)

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     Anders Hejlsberg (ahejlsberg)

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6. Commits on Oct 13, 2026

   • [api] Leave a config out of its own extended source files (#64755)

     Christopher Plieger (cplieger)

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   • Fix crash on decorated anonymous class declaration (#63971)

     Mateusz Burzyński (Andarist)

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   • Match Strada and don't resolve imports of ambient modules declared in the same file (#64491)

     Mateusz Burzyński (Andarist)

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   • Add content mapper output extensions (#64581)

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     Andrew Branch (andrewbranch)

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   • Bump the github-actions group across 1 directory with 6 updates (#64741)

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     dependabot[bot]

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