Method prepend

src/MagicString.ts:686–693

* Prepends the string with the specified content.

(content: string)

   * Prepends the string with the specified content.
   */
  prepend(content: string): this {
    if (typeof content !== 'string') {
      throw new MagicStringError(`content must be a string, got ${typeof content}`)
    }

    this.intro = content + this.intro
    return this
  }

  /**
   * Same as `s.appendLeft(...)`, except that the inserted content will go *before* any previous appends or prepends at index