Fix: TypeError: cli.isMultipleCompiler is not a function Error

In my project, I’m using webpack-cli, and I’m getting the following issue from webpack:  TypeError: cli.isMultipleCompiler is not a function at Command. 

I tried to solve the issue and sharing the details below how I was able to solve the TypeError: cli.isMultipleCompiler is not a function at Command Error.

Why TypeError: cli.isMultipleCompiler is not a function Error Occurred?

This is basically the issue with existing webpack-cli version 4.9.x. Recently webpack-cli has released 4.10.0 version, once you update to 4.10.0 version, your’s issue will be solved.

How TypeError: cli.isMultipleCompiler is not a function Error Occurred?

This is basically the issue with existing webpack-cli version 4.9.x. Recently webpack-cli has released 4.10.0 version, once you update to 4.10.0 version, your’s issue will be solved.

How to solve the TypeError: cli.isMultipleCompiler is not a function Error ?

To fix the TypeError: cli.isMultipleCompiler is not a function Error, update the webpack-cli to 4.10.0 version and your’s issue will be solved. To update the version to 4.10.0 version, use the command: npm i webpack-cli@4.10.0 OR You can run the command npm update –save webpack-cli.

Fix 1: Update the webpack-cli Version

To update the webpack-cli version, run the below command:

npm i webpack-cli@4.10.0

OR

Run the below command to upgrade the webpack-cli version:

npm update --save webpack-cli

Above methods should help you to resolve the error.

Conclusion

To fix the TypeError: cli.isMultipleCompiler is not a function Error, update the webpack-cli to 4.10.0 version and your’s issue will be solved. To update the version to 4.10.0 version, use the command: npm i webpack-cli@4.10.0 OR You can run the command npm update –save webpack-cli.

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