ngParty/ts-helpers

Name: ts-helpers

Owner: ngParty

Description: Typescript helpers for compiling typescript while specifying `--noEmitHelpers` within your `tsconfig.json`

Created: 2016-04-17 15:29:29.0

Updated: 2017-12-28 22:28:13.0

Pushed: 2017-01-16 09:21:09.0

Homepage: null

Size: 11

Language: TypeScript

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README

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:

ain.ts
rt 'ts-helpers';

and set tsconfig noEmitHelpers like following example:

ompilerOptions": {
"module": "commonjs",
"target": "es5",
"noImplicitAny": false,
"sourceMap": true,
"experimentalDecorators": true,
"emitDecoratorMetadata": true,
"moduleResolution": "node",
"pretty": true,
"noEmitHelpers": true

xclude": [
"node_modules"     

That's it! enjoy ;)