perf(@angular/build): optimize incremental watch rebuilds in AOT compilation

[alan-agius4]

Optimizes incremental watch rebuilds in AotCompilation:

• Pre-populate .d.ts shape signatures on the previous BuilderProgram for modified files prior to diffing when type-checking or TypeScript transpilation is active, preventing false-positive .d.ts cascades on incremental watch edits.
• Synchronize typeScriptProgram with Angular's template type-checking program (angularCompiler.getCurrentProgram()) after collectDiagnostics() and clear uncommitted changedFilesSet and oldSignatures entries so subsequent incremental builds preserve .d.ts signatures and do not treat .ngtypecheck.ts shims as newly added files.
• Detect affected dependent .ngtypecheck.ts shims in isolatedModules / verbatimModuleSyntax mode via TypeScript's state.hasCalledUpdateShapeSignature, ensuring cross-component template diagnostics are re-evaluated when a dependency's .d.ts shape changes without cascading on private edits.
• Avoid filter().flatMap() allocations and skip getResourceDependencies() for declaration files when collecting referencedFiles.

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[gemini-code-assist]

Code Review

This pull request optimizes incremental builds in the Angular compilation pipeline by caching the tsconfig configuration and managing the internal state of the TypeScript BuilderProgram to prevent false-positive .d.ts cascades during watch rebuilds. It also refactors file reference collection to be more efficient. The feedback highlights a critical issue where the newly added builder program synchronization and state-committing logic is placed at the end of a generator function. Since generator execution can terminate early, this logic should be wrapped in a try...finally block to guarantee it runs.

[gemini-code-assist]

Code Review

This pull request optimizes incremental builds in the Angular compilation pipeline by caching the parsed TypeScript configuration and introducing state synchronization to prevent false-positive .d.ts cascades. It also refactors resource dependency handling during file reference collection. The review feedback suggests making the .json file extension check case-insensitive to ensure robust cache invalidation across different filesystems.