fix(tsconfig): resolve extends-inherited include/exclude/files relative to the declaring config

[webpro]

Summary

include / exclude / files inherited via extends are resolved relative to the extending config's directory instead of the config that declared them. rootDirs is already normalized at parse time relative to its declaring config (src/tsconfig.rs), but include / exclude / files were normalized later in build() relative to the root config.

TypeScript resolves these relative to the file they originate in:

All relative paths found in the configuration file will be resolved relative to the configuration file they originated in.

— https://www.typescriptlang.org/tsconfig/#extends

Why it matters

An inherited relative include such as ../src/** is resolved against the wrong directory, so claims_ownership_of returns false and tsconfig: 'auto' walks up to an ancestor tsconfig.json — silently dropping the inherited paths and rootDirs.

This is SvelteKit in a monorepo: the app's tsconfig.json has "extends": "./.svelte-kit/tsconfig.json" (which maps ./$types via rootDirs and $lib via paths), and the monorepo root tsconfig.json is the ancestor. tsc / typescript-go resolve it; oxc-resolver did not.

Reproduction (added as a fixture)

extends-root-dirs-with-ancestor/
  tsconfig.json            // { "files": [] }   -- any ancestor tsconfig
  pkg/
    tsconfig.json          // { "extends": "./gen/tsconfig.json" }
    gen/tsconfig.json      // { "compilerOptions": { "rootDirs": ["..", "./types"] },
                           //   "include": ["./types/**/*.ts", "../src/**/*.ts"] }
    gen/types/src/data.ts  // export type Data = number
    src/consumer.ts        // import type { Data } from './data'

tsgo --noEmit -p pkg/tsconfig.json resolves ./data (no TS2307). resolve_file("pkg/src/consumer.ts", "./data") with tsconfig: 'auto' returned NotFound before this change — because the inherited ../src/** was resolved relative to pkg/ instead of pkg/gen/, so pkg/tsconfig.json failed to claim pkg/src/consumer.ts and discovery fell through to the ancestor.

Fix

Normalize include / exclude / files at parse time relative to the config that declared them — mirroring how rootDirs is already handled. build() now only resolves the {configDir} template (plain relative paths are already absolute).

Test

extends_root_dirs_with_ancestor_tsconfig — fails before, passes after. The full tsconfig suite stays green.

Distinct from #1185 (unresolvable extends → TsconfigNotFound).

[Boshen]

@shulaoda can you help with review

[shulaoda]

@shulaoda can you help with review

Got it, leave it to me. I’ll take a look.