Polyfills of built-in objects and methods to run IE6 and later code in early DHTML browsers.

And, tool to add the required polyfills to your code.

• decodeURI, decodeURIComponent
• encodeURI, encodeURIComponent
• Function.prototype.apply, Function.prototype.call
• Array.prototype.pop, Array.prototype.push, Array.prototype.shift, Array.prototype.splice, Array.prototype.unshift
• Array.prototype.indexOf

1. ECMAScript2/es2-postprocessor A post-processor that workaround bugs in the Javascript implementation and warns about unimplemented.
2. ECMAScript2/es2-regexpcompat, Mobile IE4 does not support RegExp!

const es2ToEs3 = require('es2-to-es3'),
      resultObject = {};

sourceOfMain = es2ToEs3(sourceOfMain, {minIEVersion: 5, resultObject : resultObject});

console.log(resultObject.requiredPolyfills); // ["Function.prototype.apply", ... ]
console.log(resultObject.embeddedPolyfills); // ["Function.prototype.apply", ... ]

sourceOfLibrary = es2ToEs3(sourceOfLibrary, {minIEVersion: 5, skipEmbedPolyfills : resultObject.embeddedPolyfills});

gulp.task('post_process_for_ie_lte_5',
    function(){
        return gulp.src('main.js')
                   .pipe(
                       require('es2-to-es3').gulp({minIEVersion: 5})
                   ).pipe(
                       gulp.dest('js/legacy')
                   );
    }
);

See the gulpfile.js of the following project for other usage examples.

1. itozyun/web-doc-base
2. ECMAScript2/es2-code-prettify
3. ECMAScript2/es2-regexpcompat

1. Embedding polyfills is simply done by looking at the Identifier name. This may result in unnecessary embedding. For Example, Embed Array.prototype.indexOf polyfill for "str".indexOf(). In this case, use skipEmbedPolyfills : ["Array.prototype.indexOf"].

1. es2-base64
2. es2-json (in preparation...)

es2-to-es3 is licensed under MIT license.

(C) 2022-2023 itozyun(blog)