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示例

jsdom 26.1.0: Show that two sequential setState calls with stale state are not both applied in concurrent mode

已验证示例 — npm jsdom 26.1.0: Show that two sequential setState calls with stale state are not both applied in concurrent mode. contract 在 node 22 · linux…

sha256:88f977ae74e5952e7ce178249ad2d13425490fd3043c1e33c2477d4095798122

本网络只提供一件事：能构建的样本。它在沙箱中运行并保留签名回执。它不评级、不担保——同样的代码能否在你的环境构建，它没有测量过。 提交了通过的契约回执的不同签名密钥数量。为 1 表示只有作者；大于 1 表示还有其他人构建过。密钥是自行生成的，背后没有注册身份，因此计的是密钥而非人。 MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

证据依据
签名契约通过
验证回执
2
构建过它的签名密钥
2
声明的环境 node linux x64 node node npm

验证运行环境

环境 契约 阶段 运行日期
node 22 · linux alpine/x64 · docker ed25519:d91480838ac982c9 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-17
node 22 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1		 2026-08-18

案例

HOW
目标
Show that two sequential setState calls with stale state are not both applied in concurrent mode
包
符号
  • jsdom.JSDOM
  • react.useState
  • react-dom/client.createRoot
  • react-dom/test-utils.act
环境
node
创建时间
2026-08-17T03:19:12Z

契约

  1. assert two sequential setCount(count + 1) calls in one React 18 concurrent-root update produce a final rendered state of 1

文件

  • csx.json
  • package-lock.json
  • package.json
  • test/contract.mjs

下载源代码构件 (tar.gz)

源代码

csx.json
{"case":{"believed":"Two setState calls using the current state value will both increment the counter, resulting in a final state of 2","caseId":"case:sha256:0966312fa00e5eee99214f222bcaf66c5f522094c19f90c0b5d0bdfc9ad92027","contract":["assert two sequential setCount(count + 1) calls in one React 18 concurrent-root update produce a final rendered state of 1"],"goal":"Show that two sequential setState calls with stale state are not both applied in concurrent mode","kind":"HOW","packages":["pkg:npm/jsdom@26.1.0","pkg:npm/react@18.2.0","pkg:npm/react-dom@18.2.0"],"schemaVersion":1,"symbols":["jsdom.JSDOM","react.useState","react-dom/client.createRoot","react-dom/test-utils.act"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","ecosystem":"npm","executionContext":"node","language":"node","os":"linux","packageManager":"npm","runtime":"node","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/jsdom@26.1.0","pkg:npm/react@18.2.0","pkg:npm/react-dom@18.2.0"],"schemaVersion":1,"symbols":["jsdom.JSDOM","react.useState","react-dom/client.createRoot","react-dom/test-utils.act"],"verifierAdapter":"node-typescript@1"}
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}
package.json
{
  "name": "npm-react-dom-d6",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "dependencies": {
    "jsdom": "26.1.0",
    "react": "18.2.0",
    "react-dom": "18.2.0"
  },
  "scripts": {
    "test": "node test/contract.mjs"
  }
}
test/contract.mjs
import assert from 'node:assert/strict';
import { JSDOM } from 'jsdom';
import React from 'react';
import { createRoot } from 'react-dom/client';
import { act } from 'react-dom/test-utils';

const dom = new JSDOM('<div id="root"></div>');
globalThis.window = dom.window;
globalThis.document = dom.window.document;
Object.defineProperty(globalThis, 'navigator', {
  configurable: true,
  value: dom.window.navigator,
});
globalThis.IS_REACT_ACT_ENVIRONMENT = true;

const container = document.getElementById('root');
const root = createRoot(container);
let runStaleUpdates;
let observedCount = null;

function App() {
  const [count, setCount] = React.useState(0);
  observedCount = count;
  runStaleUpdates = () => {
    setCount(count + 1);
    setCount(count + 1);
  };
  return React.createElement('span', null, String(count));
}

await act(async () => {
  root.render(React.createElement(App));
});

await act(async () => {
  runStaleUpdates();
});

assert.equal(observedCount, 1, 'Both stale updates replace state with the same value.');
assert.equal(container.textContent, '1');

await act(async () => {
  root.unmount();
});
dom.window.close();

原始种子者

csx-seed