Performance improvements

[timocov]

Partially fixes #302

With the following input declaration file:

// index.d.ts
import { Context } from 'effect';

export declare const foobar: <Self, Shape>() => Context.TagClass<Self, string, Shape>;
export type A = string;

export {};

The execution time of ./node_modules/.bin/dts-bundle-generator src/index.d.ts --no-check dropped from 2.64s to 1.26s (more than 2x), which is much closed to just running tsc 0.96s (but still not ideal).

cmd	NPM	PR	Diff
dts-bundle-generator src/index.d.ts --no-check 1	2.64s	1.26s	-1.38s (-52%)
dts-bundle-generator src/index.d.ts 2	3.45s	2.07s	-1.38s (-40%)
dts-bundle-generator src/index.ts --no-check	3.3s	1.8s	-1.5s (-45%)
dts-bundle-generator src/index.ts 2	4s	2.52s	-1.48s (-37%)

So overall it is around 40-50% execution time decrease on this particular example. It is worth to say that effect is a massive library and it pushes the compiler a lot in terms of types, parsing/processing/validation time.

Footnotes

1. If all input files are declaration files then it goes much faster because there is no need in extra ↩

2. --no-check disables extra compilation after the job is done thus is faster, but less safer ↩ ↩²

[timocov]

As the next step I'll try to reduce validation time as technically we can re-use the same caches during the validation time (when running without --no-check) to avoid processing the same files again and again, probably get drop a few extra hundreds of ms. Extracted into different issue #307 as it might not be possible without a breaking change or some refactoring.