Method prepend

benchmark/data.js:554–558

(content)

		return this;
	}
	prepend(content) {
		if (typeof content !== 'string') throw new TypeError('outro content must be a string');
		this.intro = content + this.intro;
		return this;
	}
	prependLeft(index, content) {
		if (typeof content !== 'string') throw new TypeError('inserted content must be a string');
		this._split(index);