Malte UblandClaude Opus 5.5 c294d129d0 Filter a union of arrays arm by arm ...

`.filter` on `A[] | B[]` refused with SC2020: `lowerArrayUnionHofCall`
admitted only `map` and `forEach`. Under TS 5.2's callable-union rule the
predicate runs over `A | B`, and the result element is the one the
predicate names — `(b): b is TextContent` over a union of block arrays
answers `TextContent[]` — which no single arm's element need equal.

`filter` joins the same arm dispatch: each arm filters its own concrete
array through the existing per-arm helper, and its survivors then pass
through the checked conversion to the checker's result element, so a
predicate that kept an element it does not describe throws instead of
reinterpreting a value. An arm with no such conversion (a boolean
predicate that names no narrower element) leaves the SC2020 fence in place.

Typed programs are untouched: the gate only widens, and `map`/`forEach`
keep their exact helper key, so the helpers a program already emitted stay
byte-identical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-29 19:11:10 -07:00

..

lowering

Filter a union of arrays arm by arm

2026-10-29 19:11:10 -07:00

shape-inference

Keep undefined out of the shape overlay's set of constructed functions

2026-10-28 06:40:50 -05:00

ts7

Reuse lib diagnostics across options that cannot change them

2026-10-28 08:56:40 -05:00

type-patches

Address review feedback

2026-10-25 19:42:02 -05:00

analysis.ts

Hold locals and module globals whose declared type does not compile as checked dynamic slots

2026-10-25 18:35:38 -07:00

arguments-usage.test.ts

Merge main and count declaration writes to parameters

2026-10-20 21:05:19 -05:00

arguments-usage.ts

Merge main and count declaration writes to parameters

2026-10-20 21:05:19 -05:00

binding-source.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

builtin-modules.ts

Merge main

2026-10-20 17:56:44 -05:00

builtin-package-aliases.test.ts

Compile readable-stream 3.x as Node's stream module too

2026-10-20 07:22:27 -07:00

builtin-package-aliases.ts

Compile readable-stream 3.x as Node's stream module too

2026-10-20 07:22:27 -07:00

canon-map.ts

Degrade a canonical form whose union mapped to the checked dynamic

2026-10-27 10:32:32 -05:00

canon.ts

Merge remote-tracking branch 'origin/main' into lf/n2-fallback

2026-10-27 05:40:00 -07:00

cjs-lexer.ts

feat(compiler): compile CommonJS syntax passes with the native client

2026-09-28 12:02:00 -05:00

cjs-resolve.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

cjs-syntax.ts

Merge main

2026-10-20 17:56:44 -05:00

comptime-node.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

comptime-node.ts

Use plain wording in docs, comments and test names

2026-10-14 11:43:44 -05:00

contract-types.ts

Keep the elements of InlineArray fields in their instances

2026-10-26 22:38:40 -05:00

decl-projection.test.ts

Move adoption into its own runtime unit behind the declAdopt feature

2026-10-22 19:35:40 -07:00

decl-projection.ts

Name the package declaration and its patch when a declared-type check fails

2026-10-25 15:06:50 -07:00

dispose-hook.ts

Collect the frontend's cycles when the native compiler disposes it

2026-10-21 09:09:19 -05:00

dts-paths.ts

Reuse lib diagnostics across options that cannot change them

2026-10-28 08:56:40 -05:00

early-errors.test.ts

Scope early errors to function bodies and class strictness, and match the upstream compareArray reads

2026-10-29 08:37:25 -05:00

early-errors.ts

Scope early errors to function bodies and class strictness, and match the upstream compareArray reads

2026-10-29 08:37:25 -05:00

experimental-import.ts

Merge main

2026-10-20 17:56:44 -05:00

fork-target.test.ts

Load a Node module's fallback declarations only when the program names it

2026-10-25 15:36:08 -05:00

fork-target.ts

Load a Node module's fallback declarations only when the program names it

2026-10-25 15:36:08 -05:00

function-completion.ts

Read AST lists through their nodes

2026-10-19 06:33:33 -05:00

helper-tokens.test.ts

Merge main

2026-10-20 17:56:44 -05:00

helper-tokens.ts

Merge main

2026-10-20 17:56:44 -05:00

heritage-elements.test.ts

Read TypeScript 7.1's heritage clause elements beside 7.0's

2026-10-26 14:09:17 -05:00

heritage-elements.ts

Read TypeScript 7.1's heritage clause elements beside 7.0's

2026-10-26 14:09:17 -05:00

inferred-js-diagnostics.test.ts

Relax the async-iterator protocol demand in untyped JavaScript

2026-10-29 05:34:46 -07:00

inferred-js-diagnostics.ts

Merge main

2026-10-20 17:56:44 -05:00

input-tracker.test.ts

Skip the helper version probe and unchanged files' digests on rebuilds

2026-10-27 03:24:16 -05:00

input-tracker.ts

Merge main

2026-10-27 19:47:24 -05:00

jsx-entities.ts

Compile JSX with the classic runtime

2026-10-22 04:27:35 -05:00

jsx-source.test.ts

Compile JSX with the classic runtime

2026-10-22 04:27:35 -05:00

jsx-source.ts

Compile JSX with the classic runtime

2026-10-22 04:27:35 -05:00

lib-contract.ts

Merge main

2026-10-20 17:56:44 -05:00

lib-exports.ts

Merge main

2026-10-20 17:56:44 -05:00

literal-values.test.ts

Answer binary requests in the literal-values test transport

2026-10-22 07:20:38 -05:00

literal-values.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

mock-shapes.ts

Merge main

2026-10-20 17:56:44 -05:00

module-source-candidates.test.ts

Merge main

2026-10-20 17:56:44 -05:00

module-source-candidates.ts

Read AST lists through their nodes

2026-10-19 06:33:33 -05:00

module-syntax.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

module-syntax.ts

Read AST lists through their nodes

2026-10-19 06:33:33 -05:00

node-api-import.ts

Pass native closures, promises and objects into Node islands by reference (NI-5)

2026-10-22 18:49:52 -07:00

npm-node.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

npm-static-builtin-aliases.ts

Merge main

2026-10-20 18:21:35 -05:00

npm-static-bundled-chunks.test.ts

Recognize esbuild's __commonJS helper under a minified name

2026-10-23 06:20:02 -05:00

npm-static-bundled-chunks.ts

Recognize esbuild's __commonJS helper under a minified name

2026-10-23 06:20:02 -05:00

npm-static-bundled-cjs.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-bundled-cjs.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-bundled-esm.test.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-bundled-esm.ts

Merge main

2026-10-20 18:21:35 -05:00

npm-static-cjs-exports-alias.test.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-cjs-exports-alias.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-cjs-exports-var.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-declaration-syntax.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-declarations.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-declarations.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-enum-iife.test.ts

Keep export on ES module enums the enum rewrite respells

2026-10-20 08:29:06 -05:00

npm-static-enum-iife.ts

Merge main

2026-10-20 18:21:35 -05:00

npm-static-namespace-defaults.test.ts

Keep CommonJS wrapper names and redeclared exports out of namespace rewrites

2026-10-25 01:04:55 -05:00

npm-static-namespace-defaults.ts

Keep CommonJS wrapper names and redeclared exports out of namespace rewrites

2026-10-25 01:04:55 -05:00

npm-static-prune.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-prune.ts

Resolve each package file's module edges once when pruning npm re-exports

2026-10-24 15:20:53 -05:00

npm-static-rewrite-host.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-rewrite-syntax.ts

Recognize esbuild's __commonJS helper under a minified name

2026-10-23 06:20:02 -05:00

npm-static-rewrite.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-subtyping.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

npm-static-subtyping.ts

Merge main

2026-10-20 17:56:44 -05:00

npm-static-tsc-helpers.test.ts

Unwrap tsc's interop helpers around builtin modules in packages

2026-10-21 08:11:47 -07:00

npm-static-tsc-helpers.ts

Unwrap tsc's interop helpers around builtin modules in packages

2026-10-21 08:11:47 -07:00

npm-static-type-exports-host.test.ts

Check every type a package type reaches before re-exporting it as a data shape

2026-10-22 00:34:51 -05:00

npm-static-type-exports-host.ts

Fix wrong npm declarations locally with type patches

2026-10-25 10:27:52 -07:00

npm-static-type-exports.test.ts

Re-export only data shapes from package declarations, through imports and .mjs entries

2026-10-21 22:23:04 -05:00

npm-static-type-exports.ts

Re-export only data shapes from package declarations, through imports and .mjs entries

2026-10-21 22:23:04 -05:00

npm-static-umd.test.ts

Unwrap a UMD wrapper only when its body is exactly TypeScript's emit

2026-10-21 19:20:54 -05:00

npm-static-umd.ts

Unwrap a UMD wrapper only when its body is exactly TypeScript's emit

2026-10-21 19:20:54 -05:00

npm-static.test.ts

Make selected npm packages join the type-checked program

2026-10-18 13:40:18 -07:00

npm-static.ts

Replace a package's declaration files or supply its declarations with type patches

2026-10-25 12:05:52 -07:00

npm.test.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

npm.ts

Map npm packages to built-in implementations and mark optional dependencies unloaded

2026-10-19 17:31:38 -07:00

package-shims.ts

Merge main

2026-10-25 05:15:58 -05:00

pipeline-native.ts

Merge main

2026-10-24 20:06:31 -05:00

pipeline.test.ts

Read AST lists through their nodes

2026-10-19 06:33:33 -05:00

pipeline.ts

Islands: CommonJS island requires, builtin-class handles, JavaScript widened bindings (#1907)

2026-10-29 15:27:09 -05:00

process-fork.ts

Keep emission's workers busy

2026-10-27 21:43:36 -05:00

program-analysis.ts

Cut repeated work in the lowering prelude's whole-program passes

2026-10-25 20:42:25 -05:00

program-node.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

program.test.ts

Reach a class's methods from 'this' in its static initializers

2026-10-22 20:01:47 -05:00

program.ts

Test262: String/Number/Boolean wrapper objects in JavaScript sources (#2550)

2026-10-29 15:24:04 -05:00

provenance-core.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

provenance-registry.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

provenance.ts

feat: ship the self-hosted native scriptc CLI (#585)

2026-09-30 02:17:56 -05:00

resolve.test.ts

Compile chalk 5 through the dynamic object model

2026-10-18 08:57:56 -07:00

resolve.ts

Merge main

2026-10-26 00:51:51 -05:00

runtime-resolve.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

runtime-resolve.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

services-node.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

services-node.ts

Make scriptc compilation native-only

2026-10-12 12:25:30 -05:00

services.test.ts

Merge main

2026-10-20 17:56:44 -05:00

services.ts

Undo the main merge on a stacked branch

2026-10-25 05:03:57 -05:00

threads-import.ts

Read declarations from symbols and signatures

2026-10-19 07:41:28 -05:00

tier-analysis.ts

Report which type failures localized failure would turn into dynamic slots

2026-10-25 16:16:41 -07:00

token-equivalence.test.ts

Reuse dev builds' frontend output after edits that keep token positions

2026-10-24 12:22:19 -05:00

token-equivalence.ts

Reuse dev builds' frontend output after edits that keep token positions

2026-10-24 12:22:19 -05:00

tsc-codes.test.ts

Optimize literal dispatch and source processing

2026-10-06 04:19:01 -05:00

tsc-codes.ts

Islands: CommonJS island requires, builtin-class handles, JavaScript widened bindings (#1907)

2026-10-29 15:27:09 -05:00

type-mapper.test.ts

Leave withUnitArm unchanged for pending placeholders

2026-10-25 12:41:21 -07:00

type-mapper.ts

Host stdio: typed process.stdout.write slot, write-callback errors, drain, run-time-typed chunks (#2546)

2026-10-29 15:59:21 -05:00

type-only-imports.ts

Read AST lists through their nodes

2026-10-19 06:33:33 -05:00

union-discriminants.test.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

union-discriminants.ts

Enforce linting and consistent source formatting

2026-10-05 17:51:24 -05:00

worker-target.test.ts

Load a Node module's fallback declarations only when the program names it

2026-10-25 15:36:08 -05:00

worker-target.ts

Merge main

2026-10-20 17:56:44 -05:00

workspace-registry.ts

refactor: clarify compiler module boundaries (#232)

2026-08-23 20:16:13 -05:00