How to connect babel polyfills?

Question

JavaScript

There is a galp and a babel.
No webpack, brazify, etc.
A library is developed with the maximum minimum file size.
There was a need to use promises.
If you add babel polyfills to gulp task

gulp.task('build', () => {
    return gulp.src([
        'node_modules/babel-polyfill/dist/polyfill.js',
        'app.js'
    ])
    //...
})

Then all polyfills are shoved, but only promises are needed.
What options exist to pull out pure promises from polyfills?

Answer 1

solution for anyone interested

// promise.js
_Promise = require('babel-runtime/core-js/promise').default;

// gulpfile.js
const gulp = require('gulp');
const concat = require('gulp-concat');
const header = require('gulp-header');
const webpack = require('webpack-stream');

gulp.task('build-promise' ,() =>{
    return gulp.src('promise.js')
        .pipe(webpack())
        .pipe(header(`
            let _Promise;
        `))
        // ....
        .pipe(concat('promise.js'))
        .pipe(gulp.dest('dist'));
})

Then you can do anything with this js, you can wrap it for example
Is there a better solution? - Write ;)

Answer 2

You here , look at useBuiltIns and corejs
I.e. no need to insert polyfills in the code, babel will insert them when he sees them. Be sure to install the core-js package , it won't build correctly without it.