remove Namespacee for tree shaking

[ryoppippi]

Feature Request

Related to #1063

Typescript's namespace is great, but this is not good for tree shaking.

Examples

with namespace

When you use vite for bundler, this code

namespace calc {
  export function add(a: number, b: number): number {
    return a + b;
  }

  export function sub(a: number, b: number): number {
    return a - b;
  }
}

console.log(add(1,2))

bundled like this

var calc;
((calc2) => {
  function add(a, b) {
    return a + b;
  }
  calc2.add = add;
  function sub(a, b) {
    return a - b;
  }
  calc2.sub = sub;
})(calc || (calc = {}));
console.log(calc.add(1, 2));

without namespace

However, if you do not use namespace

  export function add(a: number, b: number): number {
    return a + b;
  }

  export function sub(a: number, b: number): number {
    return a - b;
  }

console.log(add(1,2))

the bundle is like this↓

function add(a, b) {
  return a + b;
}

console.log(add(1, 2));

Or you can split the codebase and use Namespace Import:

calc.ts

export function add(a: number, b: number): number {
  return a + b;
}

export function sub(a: number, b: number): number {
  return a - b;
}

index.ts

import * as calc from "./calc.js";

console.log(calc.add(1, 2));

the bundle result here↓

import { add } from './calc.js';

console.log(add(1, 2));

[samchon]

I'm developing it on v7 update advised by #752

Wait for next 3 to 4 months please.

[ryoppippi]

If you need it, I'll help you!
Currently I have time to work on it

[samchon]

Thanks for helping me, but this issue needs my working, due to it needs entire compiler API level refactoring.

[ryoppippi]

OK! Thanks.
So, I wait for that! Thanks

[ryoppippi]

The namespace has almost disappeared at the implementation level, so this issue is good to close
Also, tree-skaing of named import/export works well with this #1133

However, random function is not optimized yet.

Other things are fine.

So I'll create a new issue for this specific topic!