# Source: https://rsbuild.dev/config/resolve/condition-names.md

# resolve.conditionNames

* **Type:** `string[]`
* **Default:** Same as Rspack's [resolve.conditionNames](https://rspack.rs/config/resolve#resolveconditionnames)
* **Version:** `>= 1.5.7`

Specifies the condition names used to match entry points in the [`exports` field](https://nodejs.org/api/packages.html#packages_exports) of a package.

## Example

The value of `resolve.conditionNames` overrides the default value of Rsbuild:

```js title="rsbuild.config.ts"
export default {
  resolve: {
    conditionNames: ['require', 'node'],
  },
};
```

## Rspack config

`resolve.conditionNames` is provided by Rspack, see [Rspack - resolve.conditionNames](https://rspack.rs/config/resolve#resolveconditionnames).

You can also configure it using [tools.rspack](/config/tools/rspack.md):

```ts title="rsbuild.config.ts"
export default {
  tools: {
    rspack: {
      resolve: {
        conditionNames: ['custom'],
      },
    },
  },
};
```

The difference between them is how the configuration is merged.

`tools.rspack` merges the configuration arrays based on [webpack-merge](https://github.com/survivejs/webpack-merge), which means `tools.rspack.resolve.conditionNames` will merge with the default value of Rsbuild, rather than overriding it.