Function rustCrateRootDir

src/resolution/import-resolver.ts:1845–1859

The crate-root directory (holds `lib.rs`/`main.rs`), walking up from a file.

(fromFileAbs: string, context: ResolutionContext)

/** The crate-root directory (holds `lib.rs`/`main.rs`), walking up from a file. */
function rustCrateRootDir(fromFileAbs: string, context: ResolutionContext): string | null {
  const projectRoot = context.getProjectRoot();
  const toRel = (p: string) => path.relative(projectRoot, p).replace(/\\/g, '/');
  let dir = path.dirname(fromFileAbs);
  for (let i = 0; i < 64; i++) {
    if (context.fileExists(toRel(path.join(dir, 'lib.rs'))) ||
        context.fileExists(toRel(path.join(dir, 'main.rs')))) {
      return dir;
    }
    const parent = path.dirname(dir);
    if (parent === dir) return null;
    dir = parent;
  }
  return null;
}

/** Directory under which the current file's module declares its SUBMODULES. */
function rustSelfModuleDir(fromFileAbs: string): string {