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Next.js includes the next/babel 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.
To start, you only need to define a .babelrc file (or babel.config.js) 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 next/babel preset.
Here's an example .babelrc file:
{
"presets": ["next/babel"],
"plugins": []
}
You can take a look at this file to learn about the presets included by next/babel.
To add presets/plugins without configuring them, you can do it this way:
{
"presets": ["next/babel"],
"plugins": ["@babel/plugin-proposal-do-expressions"]
}
To add presets/plugins with custom configuration, do it on the next/babel preset like so:
{
"presets": [
[
"next/babel",
{
"preset-env": {},
"transform-runtime": {},
"styled-jsx": {},
"class-properties": {}
}
]
],
"plugins": []
}
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
modulesoption on"preset-env"should be kept tofalse, otherwise webpack code splitting is turned off.
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