TS-helpers


Typescript helpers (TS <= 2.0) for compiling typescript while specifying --noEmitHelpers within your tsconfig.json.
> Cross platform ( Node/Browser/WebWorker )

NOTE: Starting Typescript 2.1 this package won't be needed anymore

Instead you can provide --importHelpers together with --noEmitHelpers which will import emit helpers from Typescript "tslib"
More info: https://github.com/Microsoft/TypeScript/pull/9097

Why?

If you are using one of following ES2015/ES.next features with Typescript:
- inheritance via class Foo extends Moo{}
- async/await
- decorators via experimentalDecorators
- metadata reflection via emitDecoratorMetadata

Typescript will generate helper code in every one file.
This can be a problem when dealing with code coverage or payload size of you library/app

To mitigate this problem Typescript starting from version 1.8 allow us to specify noEmitHelpers: truewhich wont generate these helpers.

And that's where this little utility comes into play, it defines those helpers just once for whole app.

Installation

npm install --save-dev ts-helpers

then load it from your app root file:

``typescript
// main.ts
import 'ts-helpers';
`

and set tsconfig noEmitHelpers like following example:
`json
{
"compilerOptions": {
"module": "commonjs",
"target": "es5",
"noImplicitAny": false,
"sourceMap": true,
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"moduleResolution": "node",
"pretty": true,
"noEmitHelpers": true
},
"exclude": [
"node_modules"
]
}
``

That's it! enjoy ;)