How to migrate a project to TypeScript

README.md

1. Use lebab to convert your modules to ES2015 modules.

lebab es5.js -o es6.js --transform commonjs

2. Change the .js extensions to .ts.
3. Install typescript as a devDependency to your package

npm i -D typescript

4. Add a tsconfig.json to the root of your package with the following content:

{
  "compilerOptions": {
    "removeComments": false,
    "preserveConstEnums": true,
    "sourceMap": true,
    "declaration": true,
    "noImplicitAny": false,
    "noImplicitReturns": true,
    "suppressImplicitAnyIndexErrors": true,
    "allowSyntheticDefaultImports": true,
    "strictNullChecks": true,
    "target": "es6",
    "outDir": "dist",
    "module": "commonjs",
    "moduleResolution": "node"
  },
  "filesGlob": [
    "src/"
  ]
}

5. Add a prepublish script task to your package.json:

{
  ...
  "scripts": {
    ...
    "prepublish": "tsc",
    ...
  },
  ...
}