Performance

Diagnose

• Latest version for TypeScript, dependencies, editor, plugins and extensions.
• Disable all editor extensions.
• No other hogging resources.
• Use strict compilation.

Fixing TypeScript performance problems:

tsc --listFilesOnly
tsc --explainFiles > explanations.md
tsc --extendedDiagnostics
tsc --generateTrace <output_dir>

node --max-old-space-size=8192 ./node_modules/.bin/tsc -b --extendedDiagnostics --generateTrace ./ts-trace
pnpm dlx analyze-trace ./ts-trace

Compiler

• Faster tools: swc/rome.
• Multithread: ts-loader + fork-ts-checker-plugin.
• Project references (tsc -b build mode):
  • Find tsconfig referenced projects.
  • Detect if they are up-to-date.
  • Build out-of-date projects in correct order.
  • Build provided tsconfig if itself or any dependencies have changed.
• Skip type checking (sometimes).
• Load @types/ by need (include/exclude/compilerOptions.types).
• tsc --listFiles 列出编译时包含文件列表, tsc --traceResolution 列出编译时包含文件原因.