Function resolve

packages/jest-haste-map/src/lib/fast_path.ts:21–25

(rootDir: string, relativeFilename: string)

// rootDir must be an absolute path and relativeFilename must be simple
// (e.g.: foo/bar or ../foo/bar, but never ./foo or foo/../bar)
export function resolve(rootDir: string, relativeFilename: string): string {
  return relativeFilename.startsWith(INDIRECTION_FRAGMENT)
    ? path.resolve(rootDir, relativeFilename)
    : rootDir + path.sep + relativeFilename;
}