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# Description
fixes#31159fixes#44553
Path aliases defined in `tsconfig.json` or `jsconfig.json` are not
automatically configured to work with Jest. This means that these
aliases have to be defined in multiple places.
This PR configures the SWC Jest transform to handle the `baseUrl` and
`paths`, so that users don't need to configure a `moduleNameMapper` for
Jest.
~This PR intends to make the experience more seamless by automatically
configuring Jest's `moduleNameMapper` and `moduleDirectories` based on
the settings in a project's `tsconfig`/`jsconfig`.~
~Users will be able to supply their own configuration for these fields,
if they have use-cases that require manual configuration.~
~The implementation is taken from the [`paths-to-module-name-mapper`
function in
`ts-jest`](5a0880add0/src/config/paths-to-module-name-mapper.ts).~
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Feature
- [ ] Implements an existing feature request or RFC. Make sure the
feature request has been accepted for implementation before opening a
PR.
- [x] Related issues linked using `fixes #number`
- [ ]
[e2e](https://github.com/vercel/next.js/blob/canary/contributing/core/testing.md#writing-tests-for-nextjs)
tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have a helpful link attached, see
[`contributing.md`](https://github.com/vercel/next.js/blob/canary/contributing.md)
## Documentation / Examples
- [ ] Make sure the linting passes by running `pnpm build && pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)
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