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Used to extend configurations from other files or packages. This allows you to create a base configuration and extend it for different environments or use cases.
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This option is not supported via the Node API: Extends will have no effect when using the Node API. @rspack/cli is required to use this feature.
You can extend a configuration from another file by specifying the path to the file in the extends
property. The path can be absolute or relative to the configuration file:
When using relative paths, they are resolved relative to the configuration file that contains the extends
property.
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You can extend multiple configurations by providing an array of paths. Configurations are merged from right to left, meaning that the rightmost configuration will be merged into the leftmost one, and so on:
When merging configurations:
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You can also extend configurations from packages installed in your node_modules. The package should export a valid Rspack configuration:
Configurations can have their own extends
property, allowing for nested configuration inheritance. The resolution is performed recursively: