Start a new library with TS in under 30 seconds

#typescript #tdd #jasmine

Have an awesome idea you wanna try?

Great!

You can start coding it in under 30 seconds with Typescript, Jasmine, TDD and even a coverage report!

mkdir -p idea/src
cd idea
npm init -y && npm i -D @types/jasmine \
 ts-node typescript nodemon nyc jasmine

Now open package.json and add this to the "scripts" section:

...
"scripts": {
  "test": "./node_modules/.bin/ts-node ./node_modules/jasmine/bin/jasmine --config=./jasmine.json",
  "tdd": "./node_modules/.bin/nodemon -w src -e ts -x ./node_modules/.bin/ts-node ./node_modules/jasmine/bin/jasmine --config=./jasmine.json",
  "coverage": "./node_modules/.bin/nyc -r html -e .ts -x \"src/**/*.spec.ts\" npm run test",
  "build": "tsc --project ./tsconfig.json"
}
...

Doing good!

Now create a jasmine.json

{
  "spec_dir": "src",
  "spec_files": ["**/*.spec.ts"]
}

Still counting? Okay, last one!

Create a file called tsconfig.json with this:

{
  "compilerOptions": {
    "moduleResolution": "node",
    "target": "es2019",
    "lib": ["ESNext", "DOM"],
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "typeRoots": ["./node_modules/@types"],
    "types": ["jasmine"],
    "outDir": "./dist"
  },
  "include": ["./src/**/*.ts"]
}