Enabling grid support in Autoprefixer

[kokoshneta]

As far as I can tell, when you compile LESS/SASS files using Autoprefixer, the optional Grid polyfill for IE is disabled, as is the default for Autoprefixer.

As best I’ve been able to figure out by trial-and-error pecking through the source code, Autoprefixer gets loaded in compiles/sass/SassCompiler.ts on line 168ff:

if (options.autoprefixer) {
	const LessPluginAutoPrefix = require('less-plugin-autoprefix');
	const browsers: string[] = cleanBrowsersList(options.autoprefixer);
	const autoprefixPlugin = new LessPluginAutoPrefix({ browsers });

	autoprefixPlugin.install(result, {
		addPostProcessor: function (postProcessor){
			css = postProcessor.process(css, {});
		}
	});
}

But I have no idea where less-plugin-autoprefix is getting pulled in from, nor where any options other than the browser specification is supposed to get pulled in.

Is there some way to turn on the grid polyfill feature available in Autoprefixer when using Easy Compile?