tsconfig.esm.json

{
    // Extends base TypeScript configuration from 'tsconfig.json'
    "extends": "./tsconfig.json",
    "compilerOptions": {
        // Specifies the module system for the output bundle. "ESNext" refers to the latest version of ECMAScript (JavaScript).
        "module": "ESNext",
        // The version of JavaScript that the compiler will output. "ESNext" means the latest version.
        "target": "ESNext",
        // The location where the output files will be placed.
        "outDir": "./dist/esm/",
        // If enabled (true), generates corresponding '.d.ts' file alongside the output file.
        "declaration": true,
        // Source map options
        "sourceMap": true,
        "inlineSources": true
        // If enabled, only declaration files will be emitted and no JavaScript files will be output.
        // Currently commented out, so JavaScript files are being output as well.
        // "emitDeclarationOnly": true
    },
    // A list of glob patterns that exclude certain files from the compilation.
    // Here, it's set to exclude all the files in 'node_modules' and any file ending in '.spec.ts'.
    "exclude": [
        "node_modules",
        "**/*.spec.ts"
    ]
}