Typescript with async/await, Promise and function default parameters - node.js

Question

I have a nodeJS-Express-Typescript project where I want to use some native promises with async/await and also some default value for a function. This would be a simple example of what I can achieve:
sleep(ms: number) {
return new Promise(resolve => setTimeout(resolve, 500));
}
async someFunction(param = "default") {
doStuff(param);
await sleep(500);
doSomeMoreStuff();
}
The IDE warns me about this error:
$ tsc -p .
error TS2468: Cannot find global value 'Promise'.
spec/routes/users.spec.ts(508,23): error TS2705: An async function or method in ES5/ES3 requires the 'Promise' constructor. Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your `--lib` option.
src/utils/sleep.ts(10,20): error TS2693: 'Promise' only refers to a type, but is being used as a value here.
so I have to add es2015 as target in my tsconfig.json:
"target": "es2015"
But then, this error comes when executing the transpiled JS:
/../users-api/dist/src/repository/realm-helper.js:21
static init(development = false) {
^
SyntaxError: Unexpected token =
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:373:25)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (/../users-api/dist/src/routes/users.js:4:24)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
So that I have to change the target to "es5":
"target": "es5"
Which leads to a vicious circle.
I've tried changing the value of "target" and "module" and it always fails something.
Am I missing something here? In theory, typescript 2.2 supports both features so I don't get why I can't transpile.
tsconfig.json
{
"compilerOptions": {
"outDir": "./dist/",
"rootDir": ".",
"sourceMap": true,
"module": "commonjs",
"target": "es5"
},
"include": [
"./src/**/*",
"./spec/**/*"
]
}
typescript 2.4.1
node 4.4.7

Answer 1

Try Adding lib section with es2015.promise in tsconfig.json
"lib": [
"dom",
"es5",
"scripthost",
"es2015.promise"
],
You can see the full sample here: https://github.com/basarat/typescript-book/tree/master/code/async-await/es5