CodeSampleX

サンプル

@babel/plugin-transform-class-properties 8.0.1: transformClassProperties

検証済みサンプル — npm @babel/plugin-transform-class-properties 8.0.1: transformClassProperties. node 22 · linux debian/x64 · docker で contract を実行し、成功しました.

sha256:7eac71b81a1cbfbde8009c425e77fcf4748d6e14770c2cf7bf51dd725e800d62

このネットワークが提供するのは一つだけです。ビルドされるサンプル。サンドボックスで実行し、署名済みの受領証を保管します。等級はつけず、何も保証しません — 同じコードがあなたの環境でビルドされるかは測定していません。 合格した契約受領証を提出した異なる署名鍵の数です。1 なら作者だけ、2 以上なら他の誰かもビルドしています。鍵は自己生成で背後に登録された身元がないため、数えているのは人ではなく鍵です。 MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

証拠の基準
署名済みコントラクト合格
検証レシート
1
ビルドした署名鍵
1
宣言された環境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

検証実行環境

環境 コントラクト ステージ 実行日
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…		 2026-09-02

ケース

HOW
ゴール
verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
パッケージ
シンボル
  • transformClassProperties
環境
node 22.23.2
作成日
2026-09-02T08:05:17Z

コントラクト

  1. transforms instance class fields using _defineProperty in constructor under standard mode
  2. transforms static class fields using _defineProperty on constructor under standard mode
  3. transforms instance and static class fields to direct assignment under loose mode
  4. transforms computed and Symbol property keys on class declarations
  5. evaluates transformed classes preserving runtime instance and static property semantics

ファイル

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

ソースアーティファクトをダウンロード (tar.gz)

ソース

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 transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:npm/%40babel/plugin-transform-class-properties@8.0.1
Demonstrate these symbols/APIs:
  - transformClassProperties
Constraints:
  - executionContext: node
Required runtime conditions:
  - ecosystem: npm
  - language: javascript
  - moduleSystem: cjs
  - packageManager: npm@10.9.8
  - runtime: node@22.23.2

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:sha256:7acdaa7fe95a845885e6ee94aea12d8b398b2ae0b0f49a11aec19b8647b85591","constraints":{"executionContext":"node"},"contract":["transforms instance class fields using _defineProperty in constructor under standard mode","transforms static class fields using _defineProperty on constructor under standard mode","transforms instance and static class fields to direct assignment under loose mode","transforms computed and Symbol property keys on class declarations","evaluates transformed classes preserving runtime instance and static property semantics"],"goal":"verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1","kind":"HOW","packages":["pkg:npm/%40babel/plugin-transform-class-properties@8.0.1"],"schemaVersion":1,"symbols":["transformClassProperties"]},"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/%40babel/plugin-transform-class-properties@8.0.1"],"schemaVersion":1,"subject":"pkg:npm/%40babel/plugin-transform-class-properties@8.0.1","symbols":["transformClassProperties"],"verifierAdapter":"node-typescript@1"}
package-lock.json
{
  "name": "sample-babel-transform-class-properties",
  "version": "1.0.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "sample-babel-transform-class-properties",
      "version": "1.0.0",
      "dependencies": {
        "@babel/core": "8.0.1",
        "@babel/plugin-transform-class-properties": "8.0.1"
      }
    },
    "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",
      "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",
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/core": {
      "version": "8.0.1",
      "resolved": "https://registry.npmjs.org/@babel/core/-/core-8.0.1.tgz",
      "integrity": "sha512-5FgxM4dLQpMJHSiVATk8foW263dVHQHBVpXYiimNECVWG01f4nFyEbQixeT6Mwvg7TayREJ2gpKl3o2RoMdnqw==",
      "license": "MIT",
      "dependencies": {
        "@babel/code-frame": "^8.0.0",
        "@babel/generator": "^8.0.0",
        "@babel/helper-compilation-targets": "^8.0.0",
        "@babel/helpers": "^8.0.0",
        "@babel/parser": "^8.0.0",
        "@babel/template": "^8.0.0",
        "@babel/traverse": "^8.0.0",
        "@babel/types": "^8.0.0",
        "@types/gensync": "^1.0.5",
        "convert-source-map": "^2.0.0",
        "empathic": "^2.0.1",
        "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",
      "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-annotate-as-pure": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-8.0.0.tgz",
      "integrity": "sha512-NSpMkMsvvZqzThJ0p1B02cbtA2ObEyfBvq950bmNkyxsxvcxwhvvCB036rKhlEnuBBo30bOrk13u3FzlKSoRrw==",
      "license": "MIT",
      "dependencies": {
        "@babel/types": "^8.0.0"
      },
      "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",
      "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-create-class-features-plugin": {
      "version": "8.0.1",
      "resolved": "https://registry.npmjs.org/@babel/helper-create-class-features-plugin/-/helper-create-class-features-plugin-8.0.1.tgz",
      "integrity": "sha512-++t3ZktzlLmASAxIlxeXQK9Z2YwUafYGYcvGBFevqOqt16HozVHStUoQvWD09fzAZOb/uJGpUTBuGK41AJAuOA==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-annotate-as-pure": "^8.0.0",
        "@babel/helper-member-expression-to-functions": "^8.0.0",
        "@babel/helper-optimise-call-expression": "^8.0.0",
        "@babel/helper-replace-supers": "^8.0.1",
        "@babel/helper-skip-transparent-expression-wrappers": "^8.0.0",
        "@babel/traverse": "^8.0.0",
        "semver": "^7.7.3"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      },
      "peerDependencies": {
        "@babel/core": "^8.0.0"
      }
    },
    "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",
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-member-expression-to-functions": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-8.0.0.tgz",
      "integrity": "sha512-xkXrMbtk87Gk7+oKBVmBc6EORg/Qwx++AHESldmHkpvG8wgccdhJJFwrzqlF382Fk8wfXhJHWE/g/43QvEGNPQ==",
      "license": "MIT",
      "dependencies": {
        "@babel/traverse": "^8.0.0",
        "@babel/types": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-optimise-call-expression": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-8.0.0.tgz",
      "integrity": "sha512-3W6satvtPuCUkUx63S2jMoW9EQNYkADgs1HTfufmL7gCmAulHMKupA/12WNz4A0GMMFn/YnWWwqOT9IZrJHQjg==",
      "license": "MIT",
      "dependencies": {
        "@babel/types": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/helper-plugin-utils": {
      "version": "8.0.1",
      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-8.0.1.tgz",
      "integrity": "sha512-3PKFgjTyPlhFhorfP+SjKQxLViIL++zWjFOO4hGriYU+Bsm983DxEM1JmDRJVWXV0O9npu+xXRqz7Pbd3mh70g==",
      "license": "MIT",
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      },
      "peerDependencies": {
        "@babel/core": "^8.0.0"
      }
    },
    "node_modules/@babel/helper-replace-supers": {
      "version": "8.0.1",
      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-8.0.1.tgz",
      "integrity": "sha512-B1SZADIcy3tmH8CmWvj4SHi/oAPom4UL3uknTc2QRNsPVLFk/sPnZvQL/8kj7Y5omvjMqie0vklvs6XM4OLW5Q==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-member-expression-to-functions": "^8.0.0",
        "@babel/helper-optimise-call-expression": "^8.0.0",
        "@babel/traverse": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      },
      "peerDependencies": {
        "@babel/core": "^8.0.0"
      }
    },
    "node_modules/@babel/helper-skip-transparent-expression-wrappers": {
      "version": "8.0.0",
      "resolved": "https://registry.npmjs.org/@babel/helper-skip-transparent-expression-wrappers/-/helper-skip-transparent-expression-wrappers-8.0.0.tgz",
      "integrity": "sha512-xmCA9kP3IhySsqhzwIdWGlDN/1A4cCKNBO/uwZx/3YzmDoMePwno2Q5/Bq0q+tYaKbeF940YiKV/kaW8Mzvpjw==",
      "license": "MIT",
      "dependencies": {
        "@babel/traverse": "^8.0.0",
        "@babel/types": "^8.0.0"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "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",
      "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",
      "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",
      "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",
      "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",
      "dependencies": {
        "@babel/types": "^8.0.4"
      },
      "bin": {
        "parser": "bin/babel-parser.js"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      }
    },
    "node_modules/@babel/plugin-transform-class-properties": {
      "version": "8.0.1",
      "resolved": "https://registry.npmjs.org/@babel/plugin-transform-class-properties/-/plugin-transform-class-properties-8.0.1.tgz",
      "integrity": "sha512-tORnYiVhIHnKj90TgbSZXrO24f9oEpA6MgFxpIDSKKlHv7AzBIRhkMlYevanueLNYaQXqZWarfCgXM4bWTfNiw==",
      "license": "MIT",
      "dependencies": {
        "@babel/helper-create-class-features-plugin": "^8.0.1",
        "@babel/helper-plugin-utils": "^8.0.1"
      },
      "engines": {
        "node": "^22.18.0 || >=24.11.0"
      },
      "peerDependencies": {
        "@babel/core": "^8.0.0"
      }
    },
    "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",
      "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",
      "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",
      "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",
      "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",
      "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"
    },
    "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",
      "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"
    },
    "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"
    },
    "node_modules/baseline-browser-mapping": {
      "version": "2.11.20",
      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.20.tgz",
      "integrity": "sha512-H0ulySigv6icDJ1F7SjtdCD6PrhTpdYCmP0CactWy1+ekh0AFd0o1Wn5T8b+hnTmdBx19u9yhL6wvCylXMY7zw==",
      "license": "Apache-2.0",
      "bin": {
        "baseline-browser-mapping": "dist/cli.cjs"
      },
      "engines": {
        "node": ">=6.0.0"
      }
    },
    "node_modules/browserslist": {
      "version": "4.28.8",
      "resolved": "https://registry.npmjs.org/browserslist/-/browserslist-4.28.8.tgz",
      "integrity": "sha512-V2NpofLblG64mfOtSgDhOJESZEGogzDMBv/q+W6oc4LXWP/q75eOXoOaaOu1EOadB9U4Bwx/e0yzbvwKH8zalA==",
      "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": "^2.11.12",
        "caniuse-lite": "^1.0.30001809",
        "electron-to-chromium": "^1.5.402",
        "node-releases": "^2.0.53",
        "update-browserslist-db": "^1.3.0"
      },
      "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"
    },
    "node_modules/electron-to-chromium": {
      "version": "1.5.420",
      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.420.tgz",
      "integrity": "sha512-2yD6XreGusOfNV+dUcvipJEXc3n/n7fgr7996aszTG+YY5E4mqM4tOq/3uhP129cazL9YHbVWSpc79ePotWtPA==",
      "license": "ISC"
    },
    "node_modules/empathic": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/empathic/-/empathic-2.0.1.tgz",
      "integrity": "sha512-YGRs8knHhKHVShLkFET/rWAU8kmHbOV5LwN938RHI0pljAJ1Gf6SzXsSmRaEzcXTtOOmVqJ5+WtQPL5uigY50Q==",
      "license": "MIT",
      "engines": {
        "node": ">=14"
      }
    },
    "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/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",
      "engines": {
        "node": ">=6.9.0"
      }
    },
    "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",
      "funding": {
        "type": "github",
        "url": "https://github.com/sponsors/wooorm"
      }
    },
    "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"
    },
    "node_modules/jsesc": {
      "version": "3.1.0",
      "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",
      "integrity": "sha512-/sM3dO2FOzXjKQhJuo0Q173wf2KOo8t4I8vHy6lF9poUp7bKT0/NHE8fPX23PwfhnykfqnC2xRxOnVw5XuGIaA==",
      "license": "MIT",
      "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",
      "bin": {
        "json5": "lib/cli.js"
      },
      "engines": {
        "node": ">=6"
      }
    },
    "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",
      "engines": {
        "node": "20 || >=22"
      }
    },
    "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",
      "engines": {
        "node": ">=12.20.0"
      }
    },
    "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/semver": {
      "version": "7.8.5",
      "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
      "integrity": "sha512-Y7/KDsb8LjooZpwaqGyulO6DQlksgCncchHGk+sZIY4SBvUocMBEFH5Ur1fI4dV+Jvl0w6cjvucaIi40puRioA==",
      "license": "ISC",
      "bin": {
        "semver": "bin/semver.js"
      },
      "engines": {
        "node": ">=10"
      }
    },
    "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"
      }
    }
  }
}
package.json
{
  "name": "sample-babel-transform-class-properties",
  "version": "1.0.0",
  "type": "module",
  "dependencies": {
    "@babel/core": "8.0.1",
    "@babel/plugin-transform-class-properties": "8.0.1"
  }
}
spec.json
{
  "schemaVersion": 1,
  "goal": "verify transformClassProperties in pkg:npm/%40babel/plugin-transform-class-properties@8.0.1",
  "kind": "HOW",
  "packages": [
    "pkg:npm/%40babel/plugin-transform-class-properties@8.0.1"
  ],
  "symbols": [
    "transformClassProperties"
  ],
  "constraints": {
    "executionContext": "node"
  },
  "runtimeConditions": {
    "ecosystem": "npm",
    "language": "javascript",
    "moduleSystem": "cjs",
    "packageManager": "npm@10.9.8",
    "runtime": "node@22.23.2"
  }
}
src/index.mjs
import { transformSync } from '@babel/core';
import transformClassPropertiesPlugin from '@babel/plugin-transform-class-properties';

const plugin = transformClassPropertiesPlugin.default || transformClassPropertiesPlugin;

/**
 * Transforms class properties in JavaScript code using @babel/plugin-transform-class-properties.
 *
 * @param {string} code - Source code containing class property definitions.
 * @param {object} [options={}] - Transformation options.
 * @param {boolean} [options.loose=false] - Whether to transform properties in loose mode.
 * @returns {string} The transformed JavaScript code.
 */
export function compileClassProperties(code, options = {}) {
  const pluginConfig = options.loose !== undefined
    ? [plugin, { loose: options.loose }]
    : [plugin];

  const result = transformSync(code, {
    plugins: [pluginConfig],
    configFile: false,
    babelrc: false,
  });

  return result?.code ?? '';
}

export default plugin;
test/contract.mjs
import assert from 'node:assert';
import plugin, { compileClassProperties } from '../src/index.mjs';

// 1. transforms instance class fields using _defineProperty in constructor under standard mode
{
  const source = `
class Counter {
  count = 0;
  increment = () => {
    this.count += 1;
  };
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(this, "count", 0)'), true);
  assert.strictEqual(output.includes('_defineProperty(this, "increment"'), true);
}

// 2. transforms static class fields using _defineProperty on constructor under standard mode
{
  const source = `
class AppConfig {
  static version = '2.0.0';
  static maxRetries = 3;
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(AppConfig, "version", "2.0.0")') || output.includes("_defineProperty(AppConfig, \"version\", '2.0.0')"), true);
  assert.strictEqual(output.includes('_defineProperty(AppConfig, "maxRetries", 3)'), true);
}

// 3. transforms instance and static class fields to direct assignment under loose mode
{
  const source = `
class User {
  name = 'Anonymous';
  static role = 'guest';
}
`;
  const output = compileClassProperties(source, { loose: true });
  assert.strictEqual(output.includes('_defineProperty'), false);
  assert.strictEqual(output.includes("this.name = 'Anonymous'"), true);
  assert.strictEqual(output.includes("User.role = 'guest'"), true);
}

// 4. transforms computed and Symbol property keys on class declarations
{
  const source = `
const symId = Symbol('id');
class Entity {
  [symId] = 'E-100';
  static ['category'] = 'general';
}
`;
  const output = compileClassProperties(source);
  assert.strictEqual(output.includes('_defineProperty(this, symId, "E-100")') || output.includes("_defineProperty(this, symId, 'E-100')"), true);
  assert.strictEqual(output.includes('_defineProperty(Entity, "category", "general")') || output.includes("_defineProperty(Entity, 'category', 'general')") || output.includes("_defineProperty(Entity, \"category\", 'general')"), true);
}

// 5. evaluates transformed classes preserving runtime instance and static property semantics
{
  const source = `
class MathService {
  multiplier = 2;
  static defaultBase = 10;

  calculate(val) {
    return (val + MathService.defaultBase) * this.multiplier;
  }
}
`;
  const output = compileClassProperties(source);
  const factory = new Function(output + '\nreturn MathService;');
  const MathService = factory();

  assert.strictEqual(MathService.defaultBase, 10);
  const service = new MathService();
  assert.strictEqual(service.multiplier, 2);
  assert.strictEqual(service.calculate(5), 30);
}

console.log('Contract tests passed successfully.');

オリジンシーダー

匿名