The error message “Your lockfile needs to be updated, but Yarn was run with –frozen-lockfile” occurs when you run the Yarn command with the –frozen-lockfile flag, but there are changes in your package.json or yarn.lock file that require an update to the lockfile.
The –frozen-lockfile flag is used to prevent any modifications to the yarn.lock file to ensure that the project is built with the exact dependencies specified in the lockfile. However, if there are changes made to the package.json file, such as adding or updating dependencies, the lockfile needs to be updated accordingly.
To resolve this error, you have a few options:
- Remove the –frozen-lockfile flag: By removing the –frozen-lockfile flag, Yarn will be allowed to update the lockfile as needed. You can do this by running the same command without the flag. For example:
yarn install - Update the package.json and lockfile manually: If you want to keep the –frozen-lockfile flag, you will need to manually update the package.json and lockfile to ensure they are in sync. You can do this by making the necessary changes to the package.json file and then running the following command:
yarn install --ignore-scripts
This command will update the lockfile without executing any scripts defined in the package.json file. - Remove yarn.lock and reinstall dependencies: Another option is to remove the yarn.lock file and then reinstall the dependencies. This will generate a new lockfile with the updated dependencies. You can do this by running the following commands:
rm yarn.lock
yarn install
Keep in mind that removing the lockfile may lead to slightly different dependency resolutions compared to the previous lockfile.
It’s important to note that the best approach depends on your specific project requirements. If maintaining exact dependency versions is crucial, you may want to stick with the –frozen-lockfile flag and manually update the lockfile. On the other hand, if you want to ensure that your lockfile is always up to date with the package.json, removing the flag or removing the lockfile altogether may be a better choice.