(chore) tune up TypeScript compiler

[r3nya]

Hello @wmonk and thanks a lot for your job! 😉

Context

• https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-1.html#support-for-external-helpers-library-tslib

Motivation

• Reduced bundle size

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PS: It was helpful for all my projects.

[elektronik2k5]

Good idea @r3nya! I do the same in my projects and it is definitely a good default.
However, you're missing a crucial part: "tslib": "^1.9.3", in package.json, under dependencies.

[r3nya]

Hi @elektronik2k5!
Yeah, you're right! Thanks! 👍

[DorianGrey]

LGTM, thanks!