Grunt task to strip unnecessary imports from the sass files

Gruntfile.js

grunt.registerMultiTask('sassStripImports',
    'Strips @import statements from the top of SCSS files',
    // Stripping imports prevents code duplication yet still allows IDEs to properly resolve variables.
    function () {
        var options = this.options();
        this.files.forEach(function (mapping) {
            grunt.file.expand(mapping.src).forEach(function (path) {
                grunt.file.write(path, grunt.file.read(path).replace((options.pattern || /@import\s\".+\";/), ''));
            });
        });
    }
);

grunt.initConfig({
    sassStripImports: {
        options: {
            // Don't strip imports including files starting with _partial (accessed on the same or other path)
            pattern: /@import\s\"(?!(.*\/?)*_partial).+\";/,
        },
        app: {
            src: [
                'app/modules/**/_*.tmp.scss', // remember to create copies and then use them
            ],
        },
    },
});