Method insert

lib/core/tree.js:133–139

* @param {string} key * @param {any} value * @returns {void} *

(key, value)

   * @returns {void}
   * */
  insert (key, value) {
    if (this.node === null) {
      this.node = new TstNode(key, value, 0)
    } else {
      this.node.add(key, value)
    }
  }

  /**
   * @param {Uint8Array} key