示例
Demonstrate that core-js polyfilled Object.groupBy returns a null-prototype object rather than a standard Object instance.
sha256:94ecf6a51292da84f82ff7f1f2b8cb3ab6b763507c9dd919398f8a0f581b31dd
PUBLISHED
L3_CONTRACT_PASS
MIT-0
案例
- 目标
- Demonstrate that core-js polyfilled Object.groupBy returns a null-prototype object rather than a standard Object instance. HOW
- 包
- core-js 3.40.0
- 环境
- node
- 创建时间
- 2026-08-16T18:09:03Z
常见的想当然
Object.groupBy returns a plain Object instance inheriting from Object.prototype with standard methods such as toString and hasOwnProperty.
这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。
契约
- Object.groupBy returns an object with a null prototype rather than Object.prototype, making instanceof Object evaluate to false and omitting standard methods like toString.
- Object.getPrototypeOf(Object.groupBy([1], x => 'key')) is null
- Object.groupBy([1], x => 'key') instanceof Object is false
- Object.groupBy([1], x => 'key').toString throws a TypeError
文件
- NOTES.md
- csx.json
- package-lock.json
- package.json
- test/contract.mjs
下载已验证的构件 (tar.gz) — 契约实际运行的那些字节
原始种子者
验证回执
- node 22 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-16 · ed25519:d91480838ac982c9