Function updateFile

packages/plugin-vite/tests/test_utils.ts:12–25

(
  filePath: string,
  fn: (text: string) => string | Promise<string>,
)

export const FIXTURE_DIR = path.join(import.meta.dirname!, "fixtures");

export async function updateFile(
  filePath: string,
  fn: (text: string) => string | Promise<string>,
) {
  const original = await Deno.readTextFile(filePath);
  const result = await fn(original);
  await Deno.writeTextFile(filePath, result);

  return {
    async [Symbol.asyncDispose]() {
      await Deno.writeTextFile(filePath, original);
    },
  };
}

async function copyDir(from: string, to: string) {
  const entries = walk(from, {