Method _split

src/MagicString.ts:977–1000

@internal

(index: number)

  /** @internal */
  _split(index: number): boolean | void {
    if (this.byStart.get(index) || this.byEnd.get(index))
      return

    if (DEBUG)
      this.stats.time('_split')

    let chunk = this.lastSearchedChunk
    let previousChunk = chunk
    const searchForward = index > chunk.end

    while (chunk) {
      if (chunk.contains(index))
        return this._splitChunk(chunk, index)

      chunk = searchForward ? this.byStart.get(chunk.end) : this.byEnd.get(chunk.start)

      // Prevent infinite loop (e.g. via empty chunks, where start === end)
      if (chunk === previousChunk)
        return

      previousChunk = chunk
    }
  }

  /** @internal */
  _splitChunk(chunk: Chunk, index: number): true {