chai版本问题

发表于

环境

根目录.mocharc.json

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{
    "require": "ts-node/register",
    "spec": "src/test/**/*.ts",
    "extension": ["ts"],
    "timeout": 5000,
    "reporter": "spec",
    "slow": 300,
    "ui": "bdd",
    "recursive": true
}

根目录package.json部分

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{
    "type": "commonjs",
    "scripts": {
        "test": "mocha"
    },
    "dependencies": {
        "@types/chai": "^4.3.16",
        "@types/mocha": "^10.0.6",
        "chai": "^4.4.1",
        "mocha": "^10.4.0"
    }
}

复现

运行npm run test报错

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Exception during run: TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for ......................

解决

chai当前5.x版本仅支持纯ESM，而当前项目type为commonjs，安装char的4.x版本即可

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npm uninstall @types/chai chai
npm cache clean --force
npm install chai@4 @types/chai@4

相关链接

v5 - Unknown file extension ".ts" when running with mocha · Issue #1568 · chaijs/chai (github.com)