Node.js, Express, Typescript, MongoDB

tsc --init
npm init
npm install mongoose
npm install --save express
npm install --save body-parser
npm install --save-dev ts-node-dev 
npm install --save-dev typescript

npm install --save-dev @types/node
npm install --save-dev @types/express
npm install --save-dev @types/body-parser
npm install --save-dev @types/mongoose

tsconfig.json

...
"compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",  //allows us to use new import of modules
    ...
    "outDir": "./dist",   //here will be generated javascript files
    "rootDir": "./src",   //here will be our typescript files
    ...
}
...

package.json

...
"scripts": {
    "start": "ts-node-dev src/index.ts",   //here will be generated javascript files
    ...
}
...

Now you can use npm start and code will be automatically converted from typescript to javascript during development.