package.json 导出、导入和自引用

Node.js 支持 用于在 package.json 中定义入口点的新字段，称为 "exports"。该字段是在 package.json 中定义 "main" 的更强大的替代方法，并且可以控制您的包的哪些部分暴露给引用者。

Node.js supports a new field for defining entry points in package.json called "exports". This field is a more powerful alternative to defining "main" in package.json, and can control what parts of your package are exposed to consumers.

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// package.json
{
    "name": "my-package",
    "type": "module",
    "exports": {
        ".": {
            // Entry-point for `import "my-package"` in ESM
            "import": "./esm/index.js",

            // Entry-point for `require("my-package") in CJS
            "require": "./commonjs/index.cjs",
        },
    },

    // CJS fall-back for older versions of Node.js
    "main": "./commonjs/index.cjs",
}

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// package.json
{
    "name": "my-package",
    "type": "module",
    "exports": {
        ".": {
            // Entry-point for TypeScript resolution - must occur first!
            "types": "./types/index.d.ts",

            // Entry-point for `import "my-package"` in ESM
            "import": "./esm/index.js",

            // Entry-point for `require("my-package") in CJS
            "require": "./commonjs/index.cjs",
        },
    },

    // CJS fall-back for older versions of Node.js
    "main": "./commonjs/index.cjs",

    // Fall-back for older versions of TypeScript
    "types": "./types/index.d.ts"
}

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