Inop NPM | npm.io

Interoperability

SWC based tool, helps to compile TypeScript code to ESM and CommonJS Interoperable modules.

Usage

Just run build directory

npx inop src build

Use option -p to adjust package.json with following changes

{
  ...
  "type": "module",
  "main": "build/index.cjs",
  "module": "build/index.js",
  "types": "build/index.d.ts",
  "exports": {
    "require": "./build/index.cjs",
    "import": "./build/index.js"
  },
  "files": [ //list build directory and sources for sourceMap
    "build",
    "src/index.ts"
  ],
  ...
}

Use option -i to ignore specific patterns

npx inop src build -i __tests__ -i __mocks__

As for module declarations and typechecking use the following command, since swc does not support them yet

tsc --declaration --emitDeclarationOnly

Here is the recommended tsconfig.json

{
  "compilerOptions": {
    ...
    "target": "ESNext",
    "module": "NodeNext",
    "declaration": true,
    "esModuleInterop": true,
    "moduleResolution": "NodeNext",
    ...
  },
  ...
}

And jest config jest.config.js

export default {
  ...
  coverageProvider: 'v8',
  extensionsToTreatAsEsm: ['.ts'],
  moduleNameMapper: {
    '^(\\.{1,2}/.*)\\.js$': '$1',
  },
  transform: {
    '^.+\\.ts$': '@swc/jest',
  },
  ...
};

Help

Arguments:
  source                         source directory
  build                          build directory

Options:
  -V, --version                  output the version number
  -m, --match <match>            files match pattern (default: "**/*.ts")
  -s, --swcrc <swcrc>            swcrc path (default: ".swcrc")
  -i, --ignore [ignore...]       ignore patterns
  -p, --package                  adjust package.json according to main property
  --commonjs-ext [commonjs-ext]  file extension of CommonJS files (default: ".cjs")
  --esm-ext [esm-ext]            file extension of ESM files (default: ".js")
  --skip-commonjs                do not generate CommonJS files
  --skip-esm                     do not generate ESM files
  -h, --help                     display help for command