Export default for isolatation package

[ZLY201]

Is your feature request related to a problem? Please describe.

Now:

import { OrderedSet } from '@js-sdsl/ordered-set';

Describe the solution you'd like

I want:

import OrderedSet from '@js-sdsl/ordered-set';

Additional context

import { OrderedSet } from '@js-sdsl/ordered-set';

It doesn't make sense because there is only one member has been exported which named OrderedSet.

Does it possible? @noname0310

I think the problem will be require doesn't support default.

[noname0310]

I think it will be possible only if we solve the cjs export.

[noname0310]

How about applying export default only to esm?

@ZLY201

[ZLY201]

How about applying export default only to esm?

@ZLY201

What do you mean?

[noname0310]

provide export default only to users who use esm.

[ZLY201]

Do you mean:

import OrderedSet from 'ordered-set';
const { OrderedSet } = require('ordered-set');

[noname0310]

yes

[ZLY201]

yes

Why cjs cannot transform to const OrderedSet = require('ordered-set')?

[noname0310]

The problem is when the named export exists together with default export.

If you use named export, the value you received in require becomes an object.

However, it is generally impossible to be an object and a constructor of an object(a.k.a class) at the same time, so if you do default export at the same time as named export, one side is ignored.

// lib.ts
class Foo { }
class Bar { }
class Baz { }

export { Foo, Bar };
export default Baz; // this will be ignored in CJS

// index.ts

// This value will be { "Foo": [object Object], "Bar": [object Object] } 
const lib = require('./lib.js');

// Because of the Destructuring, it seems like it is the same as a named export. But what the `require` returned was just an object
const { Foo, Bar } = require('./lib.js');

[ZLY201]

I think there must be some way to transform export default xxx to exports = xxx.

I'll promise the single file like OrderedSet.ts will export only one class member.

Consider this tool: https://www.npmjs.com/package/ts-transform-default-export.