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Failed to load config next babel to extend from


Config Files

Configuration File Types​

Babel has two parallel config file formats, which can be used together, or independently.

  • Project-wide configuration
    • files, with the following extensions: , , , , .
  • File-relative configuration
    • files, with the following extensions: , , , , .
    • file, with no extension.
    • files, with a key.

Project-wide configuration​

New in Babel 7.x, Babel has a concept of a "root" directory, which defaults to the current working directory. For project-wide configuration, Babel will automatically search for a file, or an equal one using the supported extensions, in this root directory. Alternatively, users can use an explicit "configFile" value to override the default config file search behavior.

Because project-wide config files are separated from the physical location of the config file, they can be ideal for configuration that must apply broadly, even allowing plugins and presets to easily apply to files in or in symlinked packages, which were traditionally quite painful to configure in Babel 6.x.

The primary downside of this project-wide config is that, because it relies on the working directory, it can be more painful to employ in

Configure Babel

Babel can be configured! Many other tools have similar configs: ESLint (), Prettier ().

All Babel API options are allowed. configuration file.

What's your use case?​

  • You are using a monorepo?
  • You want to compile ?

is for you!

  • You have a configuration that only applies to a single part of your project?

is for you!

We recommend using the format.

​

Create a file called with the following content at the root of your project (where the is).

babel.config.json

Check out the documentation to see more configuration options.

​

Create a file called with the following content in your project.

.babelrc.json

Check out the .babelrc documentation to see more configuration options.

​

Alternatively, you can choose to specify your config from within using the key like so:

package.json

​

You can also write (like we're doing), and

babel.config.js

You are allowed to access any Node.js APIs, for example a dynamic configuration based on the process environment:

babel.config.js

dedicated documentation

Using the CLI ()​

Shell

Check out the babel-cli documentation to see more configuration options.

Using the API ()​

Check out the

Configuring Vite ​

Are you an LLM? You can read better optimized documentation at /config.md for this page in Markdown format

When running from the command line, Vite will automatically try to resolve a config file named inside project root (other JS and TS extensions are also supported).

The most basic config file looks like this:

js

Note Vite supports using ES modules syntax in the config file even if the project is not using native Node ESM, e.g. in . In this case, the config file is auto pre-processed before load.

You can also explicitly specify a config file to use with the CLI option (resolved relative to ):

bash

CONFIG LOADING

By default, Vite uses to bundle the config into a temporary file and load it. This may cause issues when importing TypeScript files in a monorepo. If you encounter any issues with this approach, you can specify to use the module runner instead, which will not create a temporary config and will transform any files on the fly. Note that module runner doesn't support CJS in config files, but external CJS packages should work as usual.

Alternatively, if you're using an environment that supports TypeScript (e.g. to use the environment&

How to configure Babel in Next.js

Next.js includes the preset to your app, which includes everything needed to compile React applications and server-side code. But if you want to extend the default Babel configs, it's also possible.

Adding Presets and Plugins

To start, you only need to define a file (or ) in the root directory of your project. If such a file is found, it will be considered as the source of truth, and therefore it needs to define what Next.js needs as well, which is the preset.

Here's an example file:

You can take a look at this file to learn about the presets included by .

To add presets/plugins without configuring them, you can do it this way:

Customizing Presets and Plugins

To add presets/plugins with custom configuration, do it on the preset like so:

To learn more about the available options for each config, visit babel's documentation site.

Good to know:

  • Next.js uses the current Node.js version for server-side compilations.
  • The option on should be kept to , otherwise webpack code splitting is turned off.

User Guide ​

💿 Installation ​

Via npm:

bash

Via yarn:

bash

Requirements

  • ESLint:
  • Node.js:

📖 Usage ​

Configuration () ​

Use file to configure rules. This is the default in ESLint v9, but can be used starting from ESLint v8.57.0. See also: https://eslint.org/docs/latest/use/configure/configuration-files-new.

Example eslint.config.js:

js

See the rule list to get the & that this plugin provides.

Bundle Configurations () ​

This plugin provides some predefined configs. You can use the following configs by adding them to . (All flat configs in this plugin are provided as arrays, so spread syntax is required when combining them with other configs.)

  • ... Settings and rules to enable correct ESLint parsing.
  • Configurations for using Vue.js 3.x:
    • ... , plus rules to prevent errors or unintended behavior.
    • ... Above, plus rules to considerably improve code readability and/or dev experience.
    • ... Above, plus rules to enforce subjective community defaults to ensure consistency.
  • Configurations for using Vue.js 2.x:
    • ... , plus rules to prevent errors or unintended behavior.
    • ... Above, plus rules to considerably improve code readability and/or dev exper
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