Method insert

deps/undici/undici.js:1552–1558

* @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
       * @returns {any}