The error encountered during parsing the module for Next.js, Webpack, and TypeScript files (.ts, .tsx) was due to an unexpected token

Here is the content of my next.config.mjs file:

export default {
  webpack: (config) => {
    // Find rules that includes current directory
    const rulesWithCurrentDir = config.module.rules.filter((rule) => rule.include && rule.include.includes(__dirname))
    // Prepare the sibling package paths that we want to include
    const apiPath = path.resolve(`${__dirname}../../api`)
    const siblingPackagePaths = [apiPath]
    // Push sibling package paths
    rulesWithCurrentDir.forEach((ruleWithCurrentDir) => ruleWithCurrentDir.include.push(...siblingPackagePaths))
    return config
  },
}

As for the babel.config.mjs file:

export default {
  presets: ["@babel/preset-env", '@babel/preset-typescript', "@babel/preset-react"],
  plugins: [
    [
      'babel-plugin-transform-imports',
      {
        lodash: {
          transform: 'lodash/${member}',
          preventFullImport: true,
        },
        '@mui/material': {
          transform: '@mui/material/${member}',
          preventFullImport: true,
        },
        '@mui/icons-material': {
          transform: '@mui/icons-material/${member}',
          preventFullImport: true,
        },
        '@mui/lab': {
          transform: '@mui/lab/${member}',
          preventFullImport: true,
        },
<snip>
}

Encountered an error while running yarn build:

../api/src/components/ModelAutocompleteField.tsx
Module parse failed: Unexpected token (6:7)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
| import { AutocompleteProps, CircularProgress, TextField, TextFieldProps } from '@mui/material'
| 
> export interface OptionType {
|   id: string
|   title?: string

Answer №1

This issue arises when your Next.js website is not recognizing the presence of TypeScript files. The system checks for the existence of tsconfig.json in the main directory of the project, alongside files like next.config.js or next.config.mjs. If the tsconfig.json is located elsewhere, manual configuration is required. You can find more information on how to do this here.

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