Function cacheForDirs

src/utils.ts:163–180

(
  cache: { set(key: string, value: V): void; get(key: string): V | undefined },
  inputDir: string,
  value: V,
  targetDir: string,
  makeKey: (dir: string) => string = (dir) => dir,
)

 * - '/repo'                 -> '/repo/package.json'
 */
export function cacheForDirs<V>(
  cache: { set(key: string, value: V): void; get(key: string): V | undefined },
  inputDir: string,
  value: V,
  targetDir: string,
  makeKey: (dir: string) => string = (dir) => dir,
): void {
  let dir = inputDir
  while (dir !== path.dirname(dir) && dir.length >= targetDir.length) {
    const key = makeKey(dir)
    // Stop caching if we hit an existing entry
    if (cache.get(key) !== undefined) break

    cache.set(key, value)
    if (dir === targetDir) break
    dir = path.dirname(dir)
  }
}