toType detection has broken "to: '[1]'"

[andyburke]

• Operating System: MacOS
• Node Version: 10.15.3
• NPM Version: 6.9.0
• webpack Version: 4.29.6
• copy-webpack-plugin Version: 5.0.2

Expected Behavior

You should be able to specify a to: like '[1]' or 'foo/[1]'.

Actual Behavior

Files are being put in a literal directory named '[1]'.

Code

I believe this is caused somewhere in this change: 52f8be6

I apologize for not submitting a PR instead, as that is my preferred way to deal with bugs, but I do not have time to dig on this right now.

How Do We Reproduce?

Create a to: setting of '[1]' that is a replacement from a RegExp test.

[alexander-akait]

Please provide minimum reproducible test repo, thanks

[andyburke]

@evilebottnawi I added a comment on the change with what I believe is causing this issue. Unfortunately, I do not have time to build a minimum repro case right now.

[alexander-akait]

Thanks, it is bug, feel free to send a PR