Simple JS Buffer implementation to easily read and write Uint8Arrays

Buffer.js

export default class Buffer extends Uint8Array {
    /**
     * @param {number} length
     */
    constructor(length) {
        super(length);
        this._cursor = 0;
    }

    /**
     * @param {number} length
     * @returns {Uint8Array}
     */
    read(length) {
        if (this._cursor + length > this.length) {
            throw new Error(`Buffer overflow: ${this._cursor} + ${length} > ${this.length}`);
        }
        const result = this.slice(this._cursor, this._cursor + length);
        this._cursor += length;
        return result;
    }

    /**
     * @returns {number}
     */
    readUint8() {
        return this.read(1)[0];
    }

    /**
     * @param {ArrayLike<number>} data
     * @returns {number}
     */
    write(data) {
        if (this._cursor + data.length > this.length) {
            throw new Error(`Buffer overflow: ${this._cursor} + ${data.length} > ${this.length}`);
        }
        this.set(data, this._cursor);
        return this._cursor += data.length;
    }

    /**
     * @param {number} byte
     * @returns {number}
     */
    writeUint8(byte) {
        return this.write([byte]);
    }

    resetCursor() {
        this._cursor = 0;
    }
}