babel-polyfill: generate individual files for each shim

[hzoo]

Choose one: is this a bug report or feature request?: feature request

Expected Behavior

it would be more intuitive and also less weird (for npm 2, yarn?) if babel-preset-env just changed into babel-polyfill still

import "core-js/string.pad-start";
import "core-js/string.pad-end";

Current Behavior

Currently https://github.com/babel/babel-preset-env/#usebuiltins turns

import "babel-polyfill";

into

import "core-js/modules/es7.string.pad-start";
import "core-js/modules/es7.string.pad-end";

Possible Solution

Generate the extra module files to be used by preset-env instead of just the one polyfill.js file in https://github.com/babel/babel/blob/7.0/packages/babel-polyfill/src/index.js.

Need to modify https://github.com/babel/babel/blob/7.0/packages/babel-polyfill/scripts/build-dist.sh to generate the individual polyfills

[andimarek]

Hi,

I would help with this issue, but I need a bit guidance. :-)

Shouldn't the expected behavior to be imports from babel-polyfill:

import "babel-polyfill/string.pad-start";
import "babel-polyfill/string.pad-end";

instead from core-js?

Otherwise generating new module files in babel-polyfill wouldn't make much sense, I think.

Thanks,
Andi

[hzoo]

@andimarek yeah must of been my typo

Done in #5584 and released with alpha 7