Before, the project directory was:

it ran successfully. Later, a new build file directory was created and the webpack.config.js It is moved to the build file,

package.json Script in

"scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node ./src/koa.js",
    "build": "webpack --config ./build/webpack.config.js"
  },

After configuration, run the

$ npm run build

Results error prompt:

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• Cannot find module ‘webpack cli / bin / config yargs‘
• Error: Cannot find module ‘webpack/schemas/WebpackOptions.json’
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• Error: cannot find module ‘webpack / lib / ruleset’_ solve
• NPM run dev error: cannot find module ‘webpack cli / bin / config yargs‘
• Error: solution to the problem of cannot find module ‘webpack / bin / config yargs’
• VUE Error: Cannot find module ‘webpack/bin/config-yargs’
• Error: Cannot find Module ‘Webpack-cli ‘- Solution
• Webpack — module build failed: error: the node API for ‘Babel’ has been moved to Babel core
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