webpack ERROR in multi ./src/index.js ./dist/bundle.js

Question

WARNING in configuration The 'mode' option has not been set. Set 'mode' option to 'development' or 'production' to enable defaults for this environment. ERROR in multi ./src/index.js ./dist/bundle.js

Answer 1

The following is the help message from webpack by typing webpack --help in webpack 4

Usage without config file: webpack <entry> [<entry>] --output [-o] <output>

Notice: --output need to be specified explicitly

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Solution:

webpack src/index.js --output dist/bundle.js --mode development

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And if you are using webpack.config.js :

const path = require('path');

module.exports = {
  mode: 'development',     // set mode option, 'development' or 'production'
  entry: './src/index.js',
  output: {
    path: path.resolve(__dirname,'dist'),
    filename: "bundle.js"
  }
};