Function Bind Syntax-friendly library API

[Fabricio Matte]

Would it be possible to expose a library API that works with the Function Bind Syntax?

I mean, an API similar to the current library API, but which uses the this binding instead of the first argument for instance methods. For instance, instead of:

var core = require('core-js/library');
core.String.repeat('*', 10);

Do something like:

var core = require('core-js/library');

'*'::core.String.prototype.repeat(10);
// transpiles to:
core.String.prototype.repeat.call('*', 10);

Needless to say, this would be an excellent way to avoid polluting the built-in prototypes while maintaining composability.

[Denis Pushkarev]

Now it's missing. Before, I wanted to add it for abstract references proposal and added it for Dict module, see example from this comment, but with current proposal it's impossible. I'll try add something like this when will be available this syntax in compilers, but it will not be so convenient as with abstract refs.

[Fabricio Matte]

ES7 function bind has been implemented in Babel -- babel/babel#1518 and babel/babel@724bf52

Any chance to have bind-operator-friendly methods soon? I'll be giving a talk to ~300 people this Saturday and it would be nice to demonstrate core-js + bind operator. 😃

If you give me the directions on how this should be approached, I can help implementing it too.

[Denis Pushkarev]

@UltCombo I can add it as you proposed - '*'::core.String.prototype.repeat(10), but not sure it's a convenient API. Maybe as temporary solution.

[Fabricio Matte]

Yes, I believe it can be improved, but I can't think of a better solution at the moment.
Using Babel, the syntax is not too ugly though:

import { String as String_ } from 'core-js';
const { repeat, startsWith /*...*/ } = String_.prototype;

'*'::repeat(10);

[Denis Pushkarev]

Should be available in 0.9.9.

Problem with single entry points for methods - currently only for static versions. I'll think about it later.

If someone have better ideas about this API - awaiting proposals.

[Fabricio Matte]

Awesome, thanks!

[Denis Pushkarev]

In 2.0 in library version it's changed to core.%CONSTRUCTOR%.virtual.%METHOD% and available special entry points.

[Fabricio Matte]

Nice. 👍