build.json

{
    "browserify": {
        "transforms": [
            ["babelify", {
                "plugins": [
                    "check-es2015-constants",
                    "transform-es2015-arrow-functions",
                    "transform-es2015-block-scoped-functions",
                    "transform-es2015-block-scoping", ["transform-es2015-classes", {
                        "loose": true
                    }],
                    ["transform-es2015-computed-properties", {
                        "loose": true
                    }],
                    ["transform-es2015-destructuring", {
                        "loose": true
                    }],
                    ["transform-es2015-for-of", {
                        "loose": true
                    }],
                    "transform-es2015-function-name",
                    "transform-es2015-literals", ["transform-es2015-modules-commonjs", {
                        "loose": true
                    }],
                    "transform-es2015-object-super",
                    "transform-es2015-parameters",
                    "transform-es2015-shorthand-properties",
                    "transform-es2015-spread",
                    "transform-es2015-sticky-regex", ["transform-es2015-template-literals", {
                        "loose": true
                    }],
                    "transform-es2015-unicode-regex",

                    "external-helpers-2",
                    "transform-proto-to-assign"
                ],
                "sourceMaps": true
            }],
            ["htmlminifyify", {
                "collapseBooleanAttributes": true,
                "collapseWhitespace": true,
                "removeAttributeQuotes": false,
                "removeComments": true,
                "removeEmptyAttributes": true,
                "removeRedundantAttributes": true,
                "removeScriptTypeAttributes": true,
                "removeStyleLinkTypeAttributes": true
            }]
        ]
    },

    "uglify": {
        "output": {
            "indent_start": 0,
            "indent_level": 4,
            "quote_keys": false,
            "space_colon": true,
            "ascii_only": false,
            "inline_script": false,
            "width": 80,
            "max_line_len": 32000,
            "screw_ie8": true,
            "beautify": false,
            "source_map": null,
            "bracketize": false,
            "comments": false,
            "semicolons": true
        },
        "compress": {
            "sequences": true,
            "properties": true,
            "dead_code": true,
            "drop_debugger": true,
            "unsafe": false,
            "conditionals": true,
            "comparisons": true,
            "evaluate": true,
            "booleans": true,
            "loops": true,
            "unused": true,
            "hoist_funs": true,
            "hoist_vars": false,
            "if_return": true,
            "join_vars": true,
            "cascade": true,
            "side_effects": true,
            "warnings": true,
            "global_defs": {}
        }
    }
}