샘플

Demonstrate that core-js/configurator overrides polyfill aggressiveness via usePolyfill, useNative, and useFeatureDetection, and that useNative still installs polyfills for undefined features.

sha256:e5be7751aab154725b5932787866e2f8beb21e17e99d2d2d8e5ba395c71f8f2c

케이스

목표

Demonstrate that core-js/configurator overrides polyfill aggressiveness via usePolyfill, useNative, and useFeatureDetection, and that useNative still installs polyfills for undefined features. HOW

패키지

core-js 3.42.0

환경

node

생성일

2026-08-18T00:52:08Z

흔히 이렇게 알고 있다

Configuring core-js with useNative prevents polyfills from being installed even when the target feature is completely missing from the environment.

이 샘플의 작성자가 여기서 개발자나 모델이 기대할 법한 내용으로 적어둔 것이다. 아래 계약이 실제로 실행된 것이다.

컨트랙트

• Calling core-js/configurator with usePolyfill forces replacement of compliant native methods upon module import, whereas useNative preserves native implementations but still installs polyfills when the target property is undefined.
• usePolyfill with Array.prototype.toReversed replaces the native implementation.
• Normalization accepts Array#findLast and array.findlastindex interchangeably.
• useNative with structuredClone preserves the native structuredClone implementation.
• useFeatureDetection resets earlier forced aggressiveness overrides back to feature detection.
• useNative with Iterator.range installs the polyfill when the native property is absent.
• Calling configurator after a module has already been imported does not retroactively replace already-evaluated methods.

파일

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

소스 아티팩트 내려받기 (tar.gz)

오리진 시더

csx-seed

검증 영수증

• node 22 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · node-typescript@1 · 2026-08-18 · ed25519:d91480838ac982c9