Support regex in files.exclude => when

I would like to ignore JS files in my project when there’s a matching TS or matching TSX file. Right now I have to choose one or the other. Please support making the “when” directive in the “files.exclude” workspace setting use a regex, so I could do this:

{
  "files.exclude": {
        "**/*.js": { "when": "$(basename).tsx?"},
  }
}

[egamma]

There is a work around 😄. Define define different regular expression that matches the same files:

{
    "files.exclude": {
        "**/*.js": { "when": "$(basename).ts"},
        "**/*?.js": { "when": "$(basename).tsx"}
    }
}

@bpasero can you pls check that we cover when in our docs.

[sparebytes]

I would like to ignore *.d.ts when there is a corresponding .ts file. Unfortunately this rule just hides all d.ts files:

"src/**/*.d.ts": { "when": "$(basename).ts" },

Apparently, $(basename) doesn’t match the * in *.d.ts but instead matches *.dt. This could be fixed using regular expressions (negative lookahead). A new variable like $(matchedname) might solve it but I see other problems with that approach.