CodeSampleX

Ejemplo

babel-plugin-polyfill-corejs3 0.11.1: exclude

Muestra verificada para npm babel-plugin-polyfill-corejs3 0.11.1: exclude. El contrato se ejecutó en node 22 · linux debian/x64 · docker y pasó.

sha256:1371347a8cdcedc78d45294dfe15a8409e628db30cc19bf6387bc0665f92200a

Esta red ofrece una sola cosa: una muestra que compila. La ejecutó en un sandbox y guardó el recibo firmado. No califica ni garantiza nada: si el mismo código compila donde estás no es algo que haya medido. Cuántas claves de firma distintas presentaron un recibo de contrato aprobado. Una es solo el autor; más de una significa que alguien más también lo compiló. Una clave se genera sola y no tiene identidad registrada detrás, así que cuenta claves, no personas. MIT-0

Evidencia de ejecución

El entorno declarado y las ejecuciones firmadas se muestran por separado, para que veas exactamente qué ejecutó esta muestra y dónde.

Base de evidencia
Contrato firmado aprobado
Recibos de verificación
1
Claves de firma que lo compilaron
1
Entorno declarado node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

Entornos de las ejecuciones de verificación

Entorno Contrato Etapas Ejecución
node 22 · linux debian/x64 · docker ed25519:c1973797be207ac4 PASS compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS
CONTAINER_RUN · node-typescript@1node:22@sha256:8a34c4ab3ea2…		 2026-09-05

Caso

HOW
Objetivo
verify exclude in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Paquetes
Símbolos
  • exclude
Entorno
node 22.23.2
Creado
2026-09-05T02:11:48Z

Contrato

  1. The exclude option suppresses polyfill injection for specified modules when targeting environments requiring polyfills
  2. Regular expression patterns in exclude options filter out entire matching namespaces of polyfills
  3. Multiple exclude patterns specified as an array suppress all matching polyfills simultaneously
  4. The entry-global method omits excluded polyfill modules from expanded core-js bundle imports
  5. The usage-pure method respects exclude options by omitting pure helper rewriting for excluded APIs
  6. Specifying a non-matching polyfill module pattern in exclude throws an option validation error
  7. Specifying conflicting polyfills in both include and exclude options throws a configuration error
  8. An empty exclude array is accepted without error and preserves default polyfill injection behavior

Archivos

  • PROMPT.md
  • csx.json
  • package-lock.json
  • package.json
  • spec.json
  • src/index.mjs
  • test/contract.mjs

Descargar el artefacto de código fuente (tar.gz)

Código fuente

PROMPT.md
Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify exclude in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/babel-plugin-polyfill-corejs3@0.11.1
Demonstrate these symbols/APIs:
  - exclude

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.
csx.json
{"case":{"caseId":"case:sha256:74f8fff3f321f6d4b3d8ba92c9110a3c978319af08e777e0a129b6bae63e38d5","contract":["The exclude option suppresses polyfill injection for specified modules when targeting environments requiring polyfills","Regular expression patterns in exclude options filter out entire matching namespaces of polyfills","Multiple exclude patterns specified as an array suppress all matching polyfills simultaneously","The entry-global method omits excluded polyfill modules from expanded core-js bundle imports","The usage-pure method respects exclude options by omitting pure helper rewriting for excluded APIs","Specifying a non-matching polyfill module pattern in exclude throws an option validation error","Specifying conflicting polyfills in both include and exclude options throws a configuration error","An empty exclude array is accepted without error and preserves default polyfill injection behavior"],"goal":"verify exclude in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1","kind":"HOW","packages":["pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"],"schemaVersion":1,"symbols":["exclude"]},"contractCommand":["node","test/contract.mjs"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"npm","executionContext":"node","language":"javascript","libc":"glibc","libcVersion":"2.39","moduleSystem":"esm","os":"linux","osVersionBucket":"24","packageManager":"npm","packageManagerVersion":"10.9.8","runtime":"node","runtimeVersion":"22.23.2","schemaVersion":1},"license":"MIT-0","packages":["pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"],"schemaVersion":1,"subject":"pkg:npm/babel-plugin-polyfill-corejs3@0.11.1","symbols":["exclude"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-babel-plugin-polyfill-corejs3",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-plugin-polyfill-corejs3",
      "version": "1.0.0",
      "dependencies": {
        "babel-plugin-polyfill-corejs3": "0.11.1"
      }
    },
    "node_modules/@babel/code-frame": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-8.0.0.tgz",
      "integrity": "sha512-dYYg153EyN2Ekbqw2zAsbd6/JR+9N2SEoC7YV2GyyqMM7x9bLDTjBD6XBhSMLH0wtIVyJj03jWNriQhaN+eoCw==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/helper-validator-identifier": "^8.0.0",
        "js-tokens": "^10.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/compat-data": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-8.0.0.tgz",
      "integrity": "sha512-DOjnob/cXOUgDOozCDeq/aK2p5y8dUIVdf6tNhEV1HQRd6I8aQ4f4fbtHRVEvb6lP3BGomrKHiS8ICAASSVQSw==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/core": {
      "version": "8.0.0-rc.6",
      "resolved": "https://registry.npmjs.org/@babel/core/-/core-8.0.0-rc.6.tgz",
      "integrity": "sha512-89SVbTu7p+M/W052SFC7R5QuQYgypfuO6HmBBbhA/Kzl6gME8Ly2QrVpIegvTxmcQKOzAPIxiEIfNk+Jxd26mw==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/code-frame": "^8.0.0-rc.6",
        "@babel/generator": "^8.0.0-rc.6",
        "@babel/helper-compilation-targets": "^8.0.0-rc.6",
        "@babel/helpers": "^8.0.0-rc.6",
        "@babel/parser": "^8.0.0-rc.6",
        "@babel/template": "^8.0.0-rc.6",
        "@babel/traverse": "^8.0.0-rc.6",
        "@babel/types": "^8.0.0-rc.6",
        "@types/gensync": "^1.0.5",
        "convert-source-map": "^2.0.0",
        "find-up-simple": "^1.0.1",
        "gensync": "^1.0.0-beta.2",
        "import-meta-resolve": "^4.2.0",
        "json5": "^2.2.3",
        "obug": "^2.1.1",
        "semver": "^7.7.3"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      },
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/babel"
      }
    },
    "node_modules/@babel/generator": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-8.0.0.tgz",
      "integrity": "sha512-NT9NrVwJsbSV6Y2FSstWa71EETOnzrjkL5/wX3D2mYHtKM+qvqB1DvR4D0Setb/gDBsHzRICifwEWMO8CnTF6g==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/parser": "^8.0.0",
        "@babel/types": "^8.0.0",
        "@jridgewell/gen-mapping": "^0.3.12",
        "@jridgewell/trace-mapping": "^0.3.28",
        "@types/jsesc": "^2.5.0",
        "jsesc": "^3.0.2"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-compilation-targets": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-8.0.0.tgz",
      "integrity": "sha512-JwculLABZvyPvyLBpwU/E/IbH2uM3mnxNtIJpxnIfb24y1PrdVxK5Dqjle4DpgqpGRnwgC7G8IkzPdSXZrO1Ew==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/compat-data": "^8.0.0",
        "@babel/helper-validator-option": "^8.0.0",
        "browserslist": "^4.24.0",
        "lru-cache": "^11.0.0",
        "semver": "^7.7.3"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider": {
      "version": "0.6.8",
      "resolved": "https://registry.npmjs.org/@babel/helper-define-polyfill-provider/-/helper-define-polyfill-provider-0.6.8.tgz",
      "integrity": "sha512-47UwBLPpQi1NoWzLuHNjRoHlYXMwIJoBf7MFou6viC/sIHWYygpvr0B6IAyh5sBdA2nr2LPIRww8lfaUVQINBA==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-compilation-targets": "^7.28.6",
        "@babel/helper-plugin-utils": "^7.28.6",
        "debug": "^4.4.3",
        "lodash.debounce": "^4.0.8",
        "resolve": "^1.22.11"
      },
      "peerDependencies": {
        "@babel/core": "^7.4.0 || ^8.0.0-0 <8.0.0"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider/node_modules/@babel/compat-data": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.29.7.tgz",
      "integrity": "sha512-locTkQyKvwIEgBzVrn8693ebc97F2U8ZHjbXwDXJ5Fn2TCpNwTlKcaKLkdHop5c/icOFE7qt7Q9JC5hnKNa6Gg==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider/node_modules/@babel/helper-compilation-targets": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-compilation-targets/-/helper-compilation-targets-7.29.7.tgz",
      "integrity": "sha512-wem6WaBj4NaVYVdNhLPPVacES6ZJ+KBBfSkTMD3YZxbP3rm3Di85tJU5ljaUNhaOynt+Aj0xruhYuzQBt8n71g==",
      "license": "MIT",
      "dependencies": {
        "@babel/compat-data": "^7.29.7",
        "@babel/helper-validator-option": "^7.29.7",
        "browserslist": "^4.24.0",
        "lru-cache": "^5.1.1",
        "semver": "^6.3.1"
      },
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider/node_modules/@babel/helper-validator-option": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-validator-option/-/helper-validator-option-7.29.7.tgz",
      "integrity": "sha512-N9ZErrD+yW5geCDtBqnOoxmR8+tNKiGuxKlDpuJxfsqpa2dFcexaziGAE/qoHLiDDreVNMupxGmSoNlyvsA3gw==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider/node_modules/lru-cache": {
      "version": "5.1.1",
      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-5.1.1.tgz",
      "integrity": "sha512-KpNARQA3Iwv+jTA0utUVVbrh+Jlrr1Fv0e56GGzAFOXN7dk/FviaDW8LHmK52DlcH4WP2n6gI8vN1aesBFgo9w==",
      "license": "ISC",
      "dependencies": {
        "yallist": "^3.0.2"
      }
    },
    "node_modules/@babel/helper-define-polyfill-provider/node_modules/semver": {
      "version": "6.3.1",
      "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
      "integrity": "sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==",
      "license": "ISC",
      "bin": {
        "semver": "bin/semver.js"
      }
    },
    "node_modules/@babel/helper-globals": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-globals/-/helper-globals-8.0.0.tgz",
      "integrity": "sha512-lLozHOM6sWWlxNo8CYqHy4MBZeTvHXNgVPBfPOGsjPKUzHC2Az9QwB6gxdQmpwHl6GlQtbGgS+lj5887guDiLw==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-plugin-utils": {
      "version": "7.29.7",
      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.29.7.tgz",
      "integrity": "sha512-G7sHYigPY17oO5SYWnfD/0MTBwVR781S/JI643e/JhUYgVgWE/61SoW3NH9KWUKyKq5LVh3npif99Wkt6j86Jw==",
      "license": "MIT",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/@babel/helper-string-parser": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-string-parser/-/helper-string-parser-8.0.0.tgz",
      "integrity": "sha512-6mJgmFFFIIO82vvoLt9XtRC7/TkzXfts1t/SpRX4IHSzMgqoPYCWesVu1udUPUWioAE/2fcG6WuI8zrkE1gwrg==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-validator-identifier": {
      "version": "8.0.4",
      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-8.0.4.tgz",
      "integrity": "sha512-4wFaiLd0bVo4cIoTXI3zKI038NIWE/cr3jvBjejOVYVxV/m8Ltav1USiGzG1fmS5J2RhgEOgXNNK46cRPnRsrg==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-validator-option": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-validator-option/-/helper-validator-option-8.0.0.tgz",
      "integrity": "sha512-U4Dybxh4WESWHt5XhBeExi4DrY0/DNK1aHpQbsrQXCUbFHuMweT0TpLEWKvaraV2Y6fS+ZXunsZ8zIuZIgvF2Q==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helpers": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-8.0.0.tgz",
      "integrity": "sha512-wfbi91pM3py96oIiJEz7qIpyXDytgr9zQC1HEWwlGNVRAEmItuU/0a41ZUKu1sJGyhhOIpc4t5vk4PYzt8wpsg==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/template": "^8.0.0",
        "@babel/types": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/parser": {
      "version": "8.0.4",
      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-8.0.4.tgz",
      "integrity": "sha512-srpptsAkEbbNIC/q8nT7o+m6CQe8CJUTV/t7MYc9NnWlgYVtHOb7JH6SorxMhN0kuRJjVqXbKClG6xSbPtzz+g==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/types": "^8.0.4"
      },
      "bin": {
        "parser": "bin/babel-parser.js"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/template": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/template/-/template-8.0.0.tgz",
      "integrity": "sha512-eAD0QW/AlbamBbw0FeGiwasbCVPq5ncW0HNVyLP3B9czqLyh4gvw+5JTSNt6le9+ziAU7mqDZsKTHf3jTb4chQ==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/code-frame": "^8.0.0",
        "@babel/parser": "^8.0.0",
        "@babel/types": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/traverse": {
      "version": "8.0.4",
      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-8.0.4.tgz",
      "integrity": "sha512-bZnmqzGG8UZneG1lLxBoWIH0G6Gr1D846Yu4/3XnY6FhCndMR49u26nTY08u/dAxWmLWF9vGQOuC+84FfIUoeg==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/code-frame": "^8.0.0",
        "@babel/generator": "^8.0.0",
        "@babel/helper-globals": "^8.0.0",
        "@babel/parser": "^8.0.4",
        "@babel/template": "^8.0.0",
        "@babel/types": "^8.0.4",
        "obug": "^2.1.1"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/types": {
      "version": "8.0.4",
      "resolved": "https://registry.npmjs.org/@babel/types/-/types-8.0.4.tgz",
      "integrity": "sha512-eY+Yn3dCqTGmyiq2QRU66lA5FL8lqqqvecHt0fF3uHONIa7ToYsaCiWV8lOKqAs0Rb2SjixiKFROngnulPtt2g==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@babel/helper-string-parser": "^8.0.0",
        "@babel/helper-validator-identifier": "^8.0.4"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@jridgewell/gen-mapping": {
      "version": "0.3.13",
      "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
      "integrity": "sha512-2kkt/7niJ6MgEPxF0bYdQ6etZaA+fQvDcLKckhy1yIQOzaoKjBBjSj63/aLVjYE3qhRt5dvM+uUyfCg6UKCBbA==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@jridgewell/sourcemap-codec": "^1.5.0",
        "@jridgewell/trace-mapping": "^0.3.24"
      }
    },
    "node_modules/@jridgewell/resolve-uri": {
      "version": "3.1.2",
      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/@jridgewell/sourcemap-codec": {
      "version": "1.6.0",
      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/@jridgewell/trace-mapping": {
      "version": "0.3.31",
      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
      "license": "MIT",
      "peer": true,
      "dependencies": {
        "@jridgewell/resolve-uri": "^3.1.0",
        "@jridgewell/sourcemap-codec": "^1.4.14"
      }
    },
    "node_modules/@types/gensync": {
      "version": "1.0.5",
      "resolved": "https://registry.npmjs.org/@types/gensync/-/gensync-1.0.5.tgz",
      "integrity": "sha512-MbsRCT7mTikHwKZ0X+LVUTLRrZZRLipTuXEO9qOYO+zmjMVk81axyClMROf6uoPD9MRVu46bx8zoR0Ad9q3NAg==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/@types/jsesc": {
      "version": "2.5.1",
      "resolved": "https://registry.npmjs.org/@types/jsesc/-/jsesc-2.5.1.tgz",
      "integrity": "sha512-9VN+6yxLOPLOav+7PwjZbxiID2bVaeq0ED4qSQmdQTdjnXJSaCVKTR58t15oqH1H5t8Ng2ZX1SabJVoN9Q34bw==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/babel-plugin-polyfill-corejs3": {
      "version": "0.11.1",
      "resolved": "https://registry.npmjs.org/babel-plugin-polyfill-corejs3/-/babel-plugin-polyfill-corejs3-0.11.1.tgz",
      "integrity": "sha512-yGCqvBT4rwMczo28xkH/noxJ6MZ4nJfkVYdoDaC/utLtWrXxv27HVrzAeSbqR8SxDsp46n0YF47EbHoixy6rXQ==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-define-polyfill-provider": "^0.6.3",
        "core-js-compat": "^3.40.0"
      },
      "peerDependencies": {
        "@babel/core": "^7.4.0 || ^8.0.0-0 <8.0.0"
      }
    },
    "node_modules/baseline-browser-mapping": {
      "version": "2.11.21",
      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.21.tgz",
      "integrity": "sha512-uh8vpY/1/YyFkunIDFH/12p7/7VdPKA1hejMVEbdkEaWnUz0Hesvx5EbiU6XxjyHZIOju+ZMbQJkRh+es3/spQ==",
      "license": "Apache-2.0",
      "bin": {
        "baseline-browser-mapping": "dist/cli.cjs"
      },
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/browserslist": {
      "version": "4.28.9",
      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.9.tgz",
      "integrity": "sha512-EWazOblFYUvlGZcfGhPUPmYh3nikUxBVb+y9MJun5f3hBi812X+8MSQTujLBtgK3cf51fJWbWfOjyeO954d+Eg==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "dependencies": {
        "baseline-browser-mapping": "^2.11.20",
        "caniuse-lite": "^1.0.30001810",
        "electron-to-chromium": "^1.5.420",
        "node-releases": "^2.0.54",
        "update-browserslist-db": "^1.3.2"
      },
      "bin": {
        "browserslist": "cli.js"
      },
      "engines": {
        "node": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12 || >=13.7"
      }
    },
    "node_modules/caniuse-lite": {
      "version": "1.0.30001810",
      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001810.tgz",
      "integrity": "sha512-TITQPUkaz+aVk5GL6NhOdwk1aEaNTSDPsGFWrTuhKGtjTF70jL/Oht2W4c6rXUe5fu7Ie19VIahAXHIIiWWNeg==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/caniuse-lite"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "CC-BY-4.0"
    },
    "node_modules/convert-source-map": {
      "version": "2.0.0",
      "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-2.0.0.tgz",
      "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/core-js-compat": {
      "version": "3.50.0",
      "resolved": "https://registry.npmjs.org/core-js-compat/-/core-js-compat-3.50.0.tgz",
      "integrity": "sha512-XGpFGbMLHwSt74YLTKho7Ib242qi6O8MSX+sRokV4oz7iKXvQWGYZthjIhjRGMxjzVkAubBO512dKGYcefmX3Q==",
      "license": "MIT",
      "dependencies": {
        "browserslist": "^4.28.7"
      },
      "engines": {
        "node": ">=6.4.0"
      },
      "funding": {
        "type": "opencollective",
        "url": "https://opencollective.com/core-js"
      }
    },
    "node_modules/debug": {
      "version": "4.4.3",
      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
      "license": "MIT",
      "dependencies": {
        "ms": "^2.1.3"
      },
      "engines": {
        "node": ">=6.0"
      },
      "peerDependenciesMeta": {
        "supports-color": {
          "optional": true
        }
      }
    },
    "node_modules/electron-to-chromium": {
      "version": "1.5.422",
      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.422.tgz",
      "integrity": "sha512-UvA/32XqrLDdZSn7Jllo1AYNcWji/G0d5M0GTViE7KoGBiMunw3a34Sb2KO4ZZyrSEhqsxFoVhWWJshdyfKqJA==",
      "license": "ISC"
    },
    "node_modules/es-errors": {
      "version": "1.3.0",
      "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
      "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/escalade": {
      "version": "3.2.0",
      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
      "license": "MIT",
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/find-up-simple": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/find-up-simple/-/find-up-simple-1.0.1.tgz",
      "integrity": "sha512-afd4O7zpqHeRyg4PfDQsXmlDe2PfdHtJt6Akt8jOWaApLOZk5JXs6VMR29lz03pRe9mpykrRCYIYxaJYcfpncQ==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=18"
      },
      "funding": {
        "url": "https://github.com/sponsors/sindresorhus"
      }
    },
    "node_modules/function-bind": {
      "version": "1.1.2",
      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.2.tgz",
      "integrity": "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA==",
      "license": "MIT",
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/gensync": {
      "version": "1.0.0-beta.2",
      "resolved": "https://registry.npmjs.org/gensync/-/gensync-1.0.0-beta.2.tgz",
      "integrity": "sha512-3hN7NaskYvMDLQY55gnW3NQ+mesEAepTqlg+VEbj7zzqEMBVNhzcGYYeqFo/TlYz6eQiFcp1HcsCZO+nGgS8zg==",
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "node_modules/hasown": {
      "version": "2.0.4",
      "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.4.tgz",
      "integrity": "sha512-T2UbfbBEF32wiepXIsMlTW9+dDYC6wMh/t/vYA4tuOMKqWz/n3vr1NFSxQiyP+zk2mXsoMA/i/7qV6LKut1t1A==",
      "license": "MIT",
      "dependencies": {
        "function-bind": "^1.1.2"
      },
      "engines": {
        "node": ">= 0.4"
      }
    },
    "node_modules/import-meta-resolve": {
      "version": "4.2.0",
      "resolved": "https://registry.npmjs.org/import-meta-resolve/-/import-meta-resolve-4.2.0.tgz",
      "integrity": "sha512-Iqv2fzaTQN28s/FwZAoFq0ZSs/7hMAHJVX+w8PZl3cY19Pxk6jFFalxQoIfW2826i/fDLXv8IiEZRIT0lDuWcg==",
      "license": "MIT",
      "peer": true,
      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/wooorm"
      }
    },
    "node_modules/is-core-module": {
      "version": "2.16.2",
      "resolved": "https://registry.npmjs.org/is-core-module/-/is-core-module-2.16.2.tgz",
      "integrity": "sha512-evOr8xfXKxE6qSR0hSXL2r3sd7ALj8+7jQEUvPYcm5sgZFdJ+AYzT6yNmJenvIYQBgIGwfwz08sL8zoL7yq2BA==",
      "license": "MIT",
      "dependencies": {
        "hasown": "^2.0.3"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/js-tokens": {
      "version": "10.0.0",
      "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-10.0.0.tgz",
      "integrity": "sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==",
      "license": "MIT",
      "peer": true
    },
    "node_modules/jsesc": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",
      "integrity": "sha512-/sM3dO2FOzXjKQhJuo0Q173wf2KOo8t4I8vHy6lF9poUp7bKT0/NHE8fPX23PwfhnykfqnC2xRxOnVw5XuGIaA==",
      "license": "MIT",
      "peer": true,
      "bin": {
        "jsesc": "bin/jsesc"
      },
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/json5": {
      "version": "2.2.3",
      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.3.tgz",
      "integrity": "sha512-XmOWe7eyHYH14cLdVPoyg+GOH3rYX++KpzrylJwSW98t3Nk+U8XOl8FWKOgwtzdb8lXGf6zYwDUzeHMWfxasyg==",
      "license": "MIT",
      "peer": true,
      "bin": {
        "json5": "lib/cli.js"
      },
      "engines": {
        "node": ">=6"
      }
    },
    "node_modules/lodash.debounce": {
      "version": "4.0.8",
      "resolved": "https://registry.npmjs.org/lodash.debounce/-/lodash.debounce-4.0.8.tgz",
      "integrity": "sha512-FT1yDzDYEoYWhnSGnpE/4Kj1fLZkDFyqRb7fNt6FdYOSxlUWAtp42Eh6Wb0rGIv/m9Bgo7x4GhQbm5Ys4SG5ow==",
      "license": "MIT"
    },
    "node_modules/lru-cache": {
      "version": "11.5.2",
      "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-11.5.2.tgz",
      "integrity": "sha512-4pfM1Ff0x50o0tQwb5ucw/RzNyD0/YJME6IVcStalZuMWxdt3sR3huStTtxz4PUmvZfRguvDejasvQ2kifR11g==",
      "license": "BlueOak-1.0.0",
      "peer": true,
      "engines": {
        "node": "20 || >=22"
      }
    },
    "node_modules/ms": {
      "version": "2.1.3",
      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
      "license": "MIT"
    },
    "node_modules/node-releases": {
      "version": "2.0.54",
      "resolved": "https://registry.npmjs.org/node-releases/-/node-releases-2.0.54.tgz",
      "integrity": "sha512-YHs7BmmcsdAI5Ozuf8JZo6PT0mv2GIWC9vMfvUC3dp65M8hn7Ux8CPL+2oBI7juNuj9d0ndhTcznq2ODBps9cQ==",
      "license": "MIT",
      "engines": {
        "node": ">=18"
      }
    },
    "node_modules/obug": {
      "version": "2.1.4",
      "resolved": "https://registry.npmjs.org/obug/-/obug-2.1.4.tgz",
      "integrity": "sha512-4a+OsYv9UktOJKE+l1A4OufDgdRF9PifWj+tJnHURo/P+WOxpG4GzUFL9qCalmWauao6ogiG+QvnCovwPoyAWA==",
      "funding": [
        "https://github.com/sponsors/sxzz",
        "https://opencollective.com/debug"
      ],
      "license": "MIT",
      "peer": true,
      "engines": {
        "node": ">=12.20.0"
      }
    },
    "node_modules/path-parse": {
      "version": "1.0.7",
      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
      "integrity": "sha512-LDJzPVEEEPR+y48z93A0Ed0yXb8pAByGWo/k5YYdYgpY2/2EsOsksJrq7lOHxryrVOn1ejG6oAp8ahvOIQD8sw==",
      "license": "MIT"
    },
    "node_modules/picocolors": {
      "version": "1.1.1",
      "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
      "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
      "license": "ISC"
    },
    "node_modules/resolve": {
      "version": "1.22.12",
      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.12.tgz",
      "integrity": "sha512-TyeJ1zif53BPfHootBGwPRYT1RUt6oGWsaQr8UyZW/eAm9bKoijtvruSDEmZHm92CwS9nj7/fWttqPCgzep8CA==",
      "license": "MIT",
      "dependencies": {
        "es-errors": "^1.3.0",
        "is-core-module": "^2.16.1",
        "path-parse": "^1.0.7",
        "supports-preserve-symlinks-flag": "^1.0.0"
      },
      "bin": {
        "resolve": "bin/resolve"
      },
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/semver": {
      "version": "7.8.5",
      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
      "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
      "license": "ISC",
      "peer": true,
      "bin": {
        "semver": "bin/semver.js"
      },
      "engines": {
        "node": ">=10"
      }
    },
    "node_modules/supports-preserve-symlinks-flag": {
      "version": "1.0.0",
      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
      "license": "MIT",
      "engines": {
        "node": ">= 0.4"
      },
      "funding": {
        "url": "https://github.com/sponsors/ljharb"
      }
    },
    "node_modules/update-browserslist-db": {
      "version": "1.3.2",
      "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.3.2.tgz",
      "integrity": "sha512-UQ+MSxlhRm1bzjhU+DcuXfjFO1FzNtqhK5+9Yvlp90ItDLk5vT932A0rFu619nf7RVS+Y/VeaUW1jaRDqZ8VJw==",
      "funding": [
        {
          "type": "opencollective",
          "url": "https://opencollective.com/browserslist"
        },
        {
          "type": "tidelift",
          "url": "https://tidelift.com/funding/github/npm/browserslist"
        },
        {
          "type": "github",
          "url": "https://github.com/sponsors/ai"
        }
      ],
      "license": "MIT",
      "dependencies": {
        "escalade": "^3.2.0",
        "picocolors": "^1.1.1"
      },
      "bin": {
        "update-browserslist-db": "cli.js"
      },
      "peerDependencies": {
        "browserslist": ">= 4.21.0"
      }
    },
    "node_modules/yallist": {
      "version": "3.1.1",
      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g==",
      "license": "ISC"
    }
  }
}
package.json
{
  "name": "sample-babel-plugin-polyfill-corejs3",
  "version": "1.0.0",
  "private": true,
  "type": "module",
  "scripts": {
    "test": "node test/contract.mjs"
  },
  "dependencies": {
    "babel-plugin-polyfill-corejs3": "0.11.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify exclude in pkg:npm/babel-plugin-polyfill-corejs3@0.11.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/babel-plugin-polyfill-corejs3@0.11.1"
  ],
  "symbols": [
    "exclude"
  ]
}
src/index.mjs
import * as babel from '@babel/core';
import polyfillCorejs3Plugin from 'babel-plugin-polyfill-corejs3';

const babelCore = babel.default || babel;
export const plugin = polyfillCorejs3Plugin.default || polyfillCorejs3Plugin;

/**
 * Transforms JavaScript code using @babel/core and babel-plugin-polyfill-corejs3.
 * @param {string} code - Source code to transform.
 * @param {object} pluginOptions - Options passed to babel-plugin-polyfill-corejs3.
 * @param {object} [babelOptions] - Additional Babel transformSync options.
 * @returns {string} Transformed JavaScript code.
 */
export function transformWithCorejs3(code, pluginOptions = {}, babelOptions = {}) {
  const result = babelCore.transformSync(code, {
    configFile: false,
    babelrc: false,
    plugins: [[plugin, pluginOptions]],
    ...babelOptions
  });
  return result ? result.code : '';
}

/**
 * Extracts injected import specifiers from transformed source code.
 * @param {string} code - Transformed JavaScript source containing import declarations.
 * @returns {string[]} List of imported module paths.
 */
export function extractInjectedImports(code) {
  const imports = [];
  const regex = /import\s+(?:[^"'\n]+\s+from\s+)?["']([^"']+)["']/g;
  let match;
  while ((match = regex.exec(code)) !== null) {
    imports.push(match[1]);
  }
  return imports;
}
test/contract.mjs
import assert from 'node:assert/strict';
import { transformWithCorejs3, extractInjectedImports } from '../src/index.mjs';

// 1. The exclude option suppresses polyfill injection for specified modules when targeting environments requiring polyfills
{
  const code = 'const p = new Promise(resolve => resolve(1)); const ok = [1, 2].includes(1);';
  const defaultOutput = transformWithCorejs3(code, {
    method: 'usage-global',
    targets: { ie: '11' }
  });
  const excludedOutput = transformWithCorejs3(code, {
    method: 'usage-global',
    targets: { ie: '11' },
    exclude: ['es.promise']
  });

  const defaultImports = extractInjectedImports(defaultOutput);
  const excludedImports = extractInjectedImports(excludedOutput);

  assert.equal(
    defaultImports.includes('core-js/modules/es.promise.js'),
    true,
    'Default output targeting IE 11 should inject es.promise'
  );
  assert.equal(
    excludedImports.includes('core-js/modules/es.promise.js'),
    false,
    'Excluded module es.promise must not be injected'
  );
  assert.equal(
    excludedImports.includes('core-js/modules/es.array.includes.js'),
    true,
    'Non-excluded module es.array.includes should still be injected'
  );
}

// 2. Regular expression patterns in exclude options filter out entire matching namespaces of polyfills
{
  const code = 'const ok = [1, 2].includes(1); const flat = [1, [2]].flat(); const p = new Promise(r => r());';
  const regexExcludedOutput = transformWithCorejs3(code, {
    method: 'usage-global',
    targets: { ie: '11' },
    exclude: [/^es\.array\./]
  });

  const imports = extractInjectedImports(regexExcludedOutput);

  assert.equal(
    imports.includes('core-js/modules/es.array.includes.js'),
    false,
    'Regex exclude /^es\\.array\\./ must suppress es.array.includes'
  );
  assert.equal(
    imports.includes('core-js/modules/es.array.flat.js'),
    false,
    'Regex exclude /^es\\.array\\./ must suppress es.array.flat'
  );
  assert.equal(
    imports.includes('core-js/modules/es.promise.js'),
    true,
    'Non-matching modules such as es.promise must remain injected'
  );
}

// 3. Multiple exclude patterns specified as an array suppress all matching polyfills simultaneously
{
  const code = 'const p = new Promise(r => r()); const ok = [1].includes(1); const str = "a".padStart(3);';
  const multiExcludedOutput = transformWithCorejs3(code, {
    method: 'usage-global',
    targets: { ie: '11' },
    exclude: ['es.promise', /^es\.string\./]
  });

  const imports = extractInjectedImports(multiExcludedOutput);

  assert.equal(
    imports.includes('core-js/modules/es.promise.js'),
    false,
    'String rule in array must suppress es.promise'
  );
  assert.equal(
    imports.includes('core-js/modules/es.string.pad-start.js'),
    false,
    'Regex rule in array must suppress es.string.pad-start'
  );
  assert.equal(
    imports.includes('core-js/modules/es.array.includes.js'),
    true,
    'Non-excluded modules must still be injected'
  );
}

// 4. The entry-global method omits excluded polyfill modules from expanded core-js bundle imports
{
  const entryCode = 'import "core-js";';
  const defaultEntryOutput = transformWithCorejs3(entryCode, {
    method: 'entry-global',
    targets: { ie: '11' }
  });
  const excludedEntryOutput = transformWithCorejs3(entryCode, {
    method: 'entry-global',
    targets: { ie: '11' },
    exclude: ['es.promise']
  });

  const defaultImports = extractInjectedImports(defaultEntryOutput);
  const excludedImports = extractInjectedImports(excludedEntryOutput);

  assert.equal(
    defaultImports.includes('core-js/modules/es.promise.js'),
    true,
    'entry-global targeting IE 11 should inject es.promise'
  );
  assert.equal(
    excludedImports.includes('core-js/modules/es.promise.js'),
    false,
    'entry-global with exclude: ["es.promise"] must omit es.promise'
  );
}

// 5. The usage-pure method respects exclude options by omitting pure helper rewriting for excluded APIs
{
  const code = 'const ok = [1, 2].includes(1);';
  const defaultPureOutput = transformWithCorejs3(code, {
    method: 'usage-pure',
    targets: { ie: '11' }
  });
  const excludedPureOutput = transformWithCorejs3(code, {
    method: 'usage-pure',
    targets: { ie: '11' },
    exclude: ['es.array.includes']
  });

  assert.equal(
    defaultPureOutput.includes('_includesInstanceProperty('),
    true,
    'Default usage-pure should rewrite to helper'
  );
  assert.equal(
    excludedPureOutput.includes('_includesInstanceProperty('),
    false,
    'Excluded method in usage-pure must not be rewritten to pure helper'
  );
  assert.equal(
    excludedPureOutput.includes('[1, 2].includes(1)'),
    true,
    'Original expression must be preserved when excluded'
  );
}

// 6. Specifying a non-matching polyfill module pattern in exclude throws an option validation error
{
  assert.throws(
    () => {
      transformWithCorejs3('const x = 1;', {
        method: 'usage-global',
        exclude: ['non-existent-polyfill-identifier']
      });
    },
    {
      message: /The following "exclude" patterns didn't match any polyfill/
    },
    'Invalid exclude pattern must throw validation error'
  );
}

// 7. Specifying conflicting polyfills in both include and exclude options throws a configuration error
{
  assert.throws(
    () => {
      transformWithCorejs3('const x = 1;', {
        method: 'usage-global',
        include: ['es.promise'],
        exclude: ['es.promise']
      });
    },
    {
      message: /The following polyfills were matched both by "include" and "exclude" patterns/
    },
    'Overlapping include and exclude must throw conflict error'
  );
}

// 8. An empty exclude array is accepted without error and preserves default polyfill injection behavior
{
  const code = 'const ok = [1, 2].includes(1);';
  const output = transformWithCorejs3(code, {
    method: 'usage-global',
    targets: { ie: '11' },
    exclude: []
  });
  const imports = extractInjectedImports(output);
  assert.equal(
    imports.includes('core-js/modules/es.array.includes.js'),
    true,
    'Empty exclude array should preserve default injection'
  );
}

console.log('All 8 contract assertions passed successfully.');

Seeder de origen

anónimo