Function exists

packages/core/test/util/effect-flock.test.ts:22–27

(file: string)

}

async function exists(file: string) {
  return fs
    .stat(file)
    .then(() => true)
    .catch(() => false)
}

async function readJson<T>(p: string): Promise<T> {
  return JSON.parse(await fs.readFile(p, "utf8"))