tsconfig.cjs.json

{
    "compilerOptions": {
        "lib": [
            "DOM",
            "ES5"
        ],
        "allowJs": true,
        "target": "ES5",
        "module": "CommonJS", // Required for enabling JavaScript import assertion support
        "declaration": true,
        "declarationMap": true,
        "outDir": "dist/cjs",
        "sourceMap": true,
        // `NodeNext` will throw compilation errors if relative import paths are missing file extension
        // reference: https://devblogs.microsoft.com/typescript/announcing-typescript-4-7/#ecmascript-module-support-in-node-js
        "moduleResolution": "NodeNext",
        // allows us to import json files
        "resolveJsonModule": true,
        // required otherwise `ms` lib doesn't import
        "esModuleInterop": true,
        "downlevelIteration": true,
    },
    "include": [
        "./src/index.ts"
    ],
    "exclude": [
        "node_modules",
        "dist"
    ]
}