Serverless fails to deploy - Webback error, "Invalid configuration object"

[ffxsam]

This is a (Bug Report / Feature Proposal)

Description

For bug reports:

• What went wrong?

Deploy won't work, webpack config is invalid.

• What did you expect should have happened?

I expected deploy to work.

• What was the config you used?

Fresh creation of a project:

$ sls create -u aws-nodejs-ecma-script -n mytest
$ sls plugin install -n serverless-webpack
$ sls deploy

• What stacktrace or error message from your provider did you see?

  Webpack Options Validation Error -----------------------

  Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration.module has an unknown property 'loaders'. These properties are valid:
   object { exprContextCritical?, exprContextRecursive?, exprContextRegExp?, exprContextRequest?, noParse?, rules?, defaultRules?, unknownContextCritical?, unknownContextRecursive?, unknownContextRegExp?, unknownContextRequest?, unsafeCache?, wrappedContextCritical?, wrappedContextRecursive?, wrappedContextRegExp?, strictExportPresence?, strictThisContextOnImports? }
   -> Options affecting the normal modules (`NormalModuleFactory`).

Additional Data

• Serverless Framework Version you're using: 1.26.1
• Operating System: macOS 10.13.3
• Stack Trace:
• Provider Error messages:

[ffxsam]

Never mind, this is an issue with the serverless-webpack plugin.

[HyperBrain]

Hi @ffxsam , thanks for the report 👍

It seems that the webpack config contains a module.loaders property which has been deprecated by webpack and is replaced by a module.rules property now. It can be that the plugin install command now installed webpack 4 where this is removed now.

The reason is an unlimited peer dependency version specifier in serverless-webpack that will be fixed with the next release.

[ffxsam]

Yep, no worries! I've just modified package.json to use webpack 3.3.0.