Laravel-mix: Can't disable Terser in production mode

[mgrinspan]

• Laravel Mix Version: 4.0.13
• Node Version: 11.6.0
• Yarn Version: 1.13.0
• OS: Ubuntu 18.04 Vagrant box on a Windows 7 host

Description:

While running in production mode, if terser is set to false an error is thrown.

Simplest Reproducible webpack.mix.js:

require('laravel-mix')
    .options({ terser: false })
    .js('resources/assets/js/app.js', 'public/js');

Steps To Reproduce:

• Use the above webpack.mix.js file
• yarn build -p

Error:

ubuntu@ubuntu-bionic:/var/www/xxxx$ yarn build -p
yarn run v1.13.0
$ node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js -p
Terser Plugin Invalid Options

options should be object

ValidationError: Terser Plugin Invalid Options
    at validateOptions (/vagrant/node_modules/schema-utils/src/validateOptions.js:32:11)
    at new TerserPlugin (/vagrant/node_modules/terser-webpack-plugin/dist/index.js:40:30)
    at module.exports (/vagrant/node_modules/laravel-mix/src/builder/webpack-default.js:41:23)
    at new WebpackConfig (/vagrant/node_modules/laravel-mix/src/builder/WebpackConfig.js:14:30)
    at Object.<anonymous> (/vagrant/node_modules/laravel-mix/setup/webpack.config.js:29:18)
    at Module._compile (/vagrant/node_modules/v8-compile-cache/v8-compile-cache.js:178:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:732:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
    at Function.Module._load (internal/modules/cjs/loader.js:552:3)
    at Module.require (internal/modules/cjs/loader.js:657:17)
    at require (/vagrant/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[mgrinspan]

Also worth noting that you can't enable it in development mode either.

[ankurk91]

Why would someone wants to disable to js minification in production?

[mgrinspan]

I personally ran into this situation trying to debug a problem that only occurred while compiling for production. It would have been very helpful to be able to disable terser to narrow down what could be causing the issue, so I had to manually modify the laravel-mix source files temporarily.

That being said, I'm sure there are other cases where one would want to disable it in production - maybe in a case where sourcemaps aren't working 100% and you need a more helpful error log.

[NBAH1990]

Did you try this?

terser: {
            terserOptions: {
                compress: false
            }
        }

also, maybe mix.sourceMaps() will help you?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[arukompas]

You can disable minification in Laravel Mix like so:

mix.webpackConfig({
    optimization: {
        minimize: false,
    }
});