Why did the compilation of Next.js using TypeScript and ESLint succeed despite encountering errors?

I've been delving into Next.js and encountered unexpected results when integrating TypeScript and ESLint.

ESLint seems to work well with TypeScript, but my project compilation is successful despite encountering errors. It's puzzling why the compilation succeeds with errors present.

Development Environment:

  "engines": {
    "node": "14.15.5",
    "yarn": "1.22.10"
  },
  ...

tsconfig.json:

...

.eslintrc:

...

The File with Errors:

...

Errors:

...

Your assistance would be greatly appreciated. Thank you for your attention.

typescriptnext.jseslint

Answer №1

I have identified the solution to the issue at hand. It is necessary to make some adjustments to the next.config.js file.

next.config.js


const LiveReloadPlugin = require('webpack-livereload-plugin')
const ESLintPlugin = require('eslint-webpack-plugin')

module.exports = {
  future: {
    webpack5: true
  },
  webpack: (config, { buildId, dev, isServer, defaultLoaders, webpack }) => {
    if (dev) config.plugins.push(
      new LiveReloadPlugin({
        port: 2999,
        hostname: 'localhost'
      }),

      new ESLintPlugin({
        extensions: ['ts', 'tsx'],
        failOnError: true
      })
    )

    return config
  }
}

Afterwards, proceed to install devDependencies

npm i eslint-webpack-plugin webpack-livereload-plugin -D

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