Method hasChanged

src/MagicString.ts:1323–1358

* Indicates if the string has been changed.

()

   * Indicates if the string has been changed.
   */
  hasChanged(): boolean {
    if (this.intro || this.outro)
      return true

    // How much of `original` the chunks visited so far reproduce, which is not
    // the same as how much of it they span: an overwrite covering several
    // chunks stores the whole replacement on the first of them and empties the
    // rest, so a chunk's content has to be compared against the original text
    // at the offset it is emitted at rather than against its own start and end
    let outputIndex = 0
    let chunk: Chunk | null = this.firstChunk

    while (chunk) {
      // Any intro/outro on a chunk means content was inserted
      if (chunk.intro || chunk.outro)
        return true

      if (!chunk.edited && chunk.start === outputIndex) {
        // An untouched chunk still at its original offset reproduces the
        // original exactly, so it needs no comparison
        outputIndex = chunk.end
      }
      else {
        // `startsWith` with an offset compares in place, where slicing the
        // original first would allocate on every edited chunk
        if (!this.original.startsWith(chunk.content, outputIndex))
          return true

        outputIndex += chunk.content.length
      }

      chunk = chunk.next
    }

    return outputIndex !== this.original.length
  }

  /** @internal */
  _replaceRegexp(searchValue: RegExp, replacement: string | ReplacementFunction): this {