Function editFile

playground/test-utils.ts:181–205

(
  filename: string,
  encodingOrReplacer: BufferEncoding | null | ((content: string) => string),
  maybeReplacer?: ((content: Buffer) => Buffer) | ((content: string) => string),
)

  replacer: ((content: Buffer) => Buffer) | ((content: string) => string),
): void
export function editFile(
  filename: string,
  encodingOrReplacer: BufferEncoding | null | ((content: string) => string),
  maybeReplacer?: ((content: Buffer) => Buffer) | ((content: string) => string),
): void {
  filename = path.resolve(testDir, filename)
  const [encoding, replacer] = maybeReplacer
    ? [encodingOrReplacer as BufferEncoding | null, maybeReplacer]
    : [class="st">'utf-8' as const, encodingOrReplacer as (content: string) => string]
  const content: string | Buffer = fs.readFileSync(filename, encoding)
  const modified = (replacer as (content: string | Buffer) => string | Buffer)(
    content,
  )
  if (Buffer.byteLength(modified) === Buffer.byteLength(content)) {
    const e = new Error(
      `editFile(class="st">"${filename}") did not change the file size. The polling ` +
        `watcher used in tests may miss same-length edits and cause flaky ` +
        `failures; change the edit so the file's byte length changes. See ` +
        `https:class="cm">//github.com/vitejs/vite/blob/main/CONTRIBUTING.md#test-env-and-helpers`,
    )
    Error.captureStackTrace(e, editFile)
    throw e
  }
  fs.writeFileSync(filename, modified)
}

export function addFile(filename: string, content: string): void {
  const resolvedFilename = path.resolve(testDir, filename)