JSTests/microbenchmarks/define-properties-simple.js

const properties = {
  closed: {
    get() {
      return this._writableState ? this._writableState.closed : false;
    },
  },
  destroyed: {
    get() {
      return this._writableState ? this._writableState.destroyed : false;
    },
    set(value) {
      if (this._writableState) {
        this._writableState.destroyed = value;
      }
    },
  },
  writable: {
    get() {
      const w = this._writableState;
      return (
        !!w &&
        w.writable !== false &&
        !w.destroyed &&
        !w.errored &&
        !w.ending &&
        !w.ended
      );
    },
    set(val) {
      if (this._writableState) {
        this._writableState.writable = !!val;
      }
    },
  },
  writableFinished: {
    get() {
      return this._writableState ? this._writableState.finished : false;
    },
  },
  writableObjectMode: {
    get() {
      return this._writableState ? this._writableState.objectMode : false;
    },
  },
  writableBuffer: {
    get() {
      return this._writableState && this._writableState.getBuffer();
    },
  },
  writableEnded: {
    get() {
      return this._writableState ? this._writableState.ending : false;
    },
  },
  writableNeedDrain: {
    get() {
      const wState = this._writableState;
      if (!wState) return false;
      return !wState.destroyed && !wState.ending && wState.needDrain;
    },
  },
  writableHighWaterMark: {
    get() {
      return this._writableState && this._writableState.highWaterMark;
    },
  },
  writableCorked: {
    get() {
      return this._writableState ? this._writableState.corked : 0;
    },
  },
  writableLength: {
    get() {
      return this._writableState && this._writableState.length;
    },
  },
  errored: {
    enumerable: false,
    get() {
      return this._writableState ? this._writableState.errored : null;
    },
  },
  writableAborted: {
    enumerable: false,
    get: function () {
      return !!(
        this._writableState.writable !== false &&
        (this._writableState.destroyed || this._writableState.errored) &&
        !this._writableState.finished
      );
    },
  },
};

var count = 10_000;

function test() {
  for (let i = 0; i < count; i++) {
    function Hey() {
      return this;
    }
    Object.defineProperties(Hey.prototype, properties);
  }
}

test();