babel+gulp+ESlint

Use Babel in Build tools

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$ npm install --save-dev gulp 
$ npm install --save-dev gulp-babel

Following gulp code demonstrates how to compile all JS files in a src/js directory into ES5 JS files and output to a dist/js directory.

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var gulp = require("gulp");
var babel = require("gulp-babel");

gulp.task("default", function () {
    return gulp.src("src/js/*.js")
        .pipe(babel())
        .pipe(gulp.dest("dist/js"));
});