feat: typescript support#19
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Run TypeScript files directly through the runtime, mirroring Node.js's
native type-stripping (stable since Node 23.6). `node app.ts`,
`require('./mod.ts')`, and `index.ts` directory resolution now work out
of the box.
Implemented with `acorn-typescript`, a pure-JS acorn plugin — no
`typescript` compiler dependency and no wasm. This keeps stripping
synchronous (required for `require()`) and adds minimal bundle weight
(index.mjs stays ~1.2MB rather than ballooning to ~10MB as it would by
pulling in the full typescript package).
Type-only syntax is replaced with whitespace, preserving source
positions: annotations, interfaces, type aliases, generics,
`import type`/`export type`, `as`/`satisfies`, non-null `!`, definite
assignment, `declare`, class member modifiers, and `implements`.
Details:
- New `src/frameworks/strip-types.ts`: parses with acorn-typescript and
blanks TS-only AST node ranges, then the existing ESM→CJS pipeline runs.
- runtime.ts: strip types before the ESM→CJS transform in loadModule and
execute; .cts treated as CommonJS, .mts/.ts as ESM-capable; added
.ts/.mts/.cts (and index.* variants) to module resolution.
- child_process.ts: `node` command resolves .ts files, including the
extensionless `node app` -> app.ts case.
Matches Node's strip-only mode: constructs needing code generation
(enums, namespaces, parameter-property assignment) are not emitted.
Only .ts/.mts/.cts are handled; .tsx/JSX continues to go through the
Vite/Next dev servers via esbuild.
Adds tests/typescript-files.test.ts and `node app.ts` coverage in
tests/child_process.test.ts. Full suite (2261) green, tsc clean.
…local binding preservation for named exports
…nment compatibility
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