Webpack.js.org: Passing ecmaVersion results in "Invalid configuration object"

[Slapbox]

Bug report

What is the current behavior?

v4.44.2 crashes with "Invalid configuration object" telling me that output.ecmaVersion is not a valid option

If the current behavior is a bug, please provide the steps to reproduce.

Provide output.ecmaVersion of any value. Tested: 5 and 6

What is the expected behavior?

No crash on using documented option https://webpack.js.org/configuration/output/#outputecmaversion

Other relevant information:
webpack version: 4.44.2
Node.js version: 12.13.0
Operating System: Windows 7
Additional tools:

[alexander-akait]

This option for webpack@5 and it was removed

[Slapbox]

The docs for that setting specifically mention Webpack 4, so it would be good to edit the docs in that case.

The default value of output.ecmaVersion in webpack 4 is 5

[Cronus1007]

I want to work on this issue.

[alexander-akait]

/cc @webpack/documentation-team high priority

[rramaa]

@evilebottnawi
https://github.com/webpack/webpack.js.org/pull/4017
Have raised a PR for the documentation

[sokra]

This issue can be merged into #3968