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"design:paramnames" metadata key #4905

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@remojansen

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@remojansen

From #2589

A few notes on metadata:

  • Type metadata uses the metadata key "design:type".
  • Parameter type metadata uses the metadata key "design:paramtypes".
  • Return type metadata uses the metadata key "design:returntype".

Can you please add support for a "design:paramnames" metadata key? It would return the design-time names of the arguments of a function

I can convert a function to string at runtime using Function.prototype.toString() and then use a couple of Regex to get the parameter names:

STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
ARGUMENT_NAMES = /([^\s,]+)/g;

But when a minifier/compressor is used the param names become "a", "b" ...

I would like to have a way to access the design-time names of the arguments of a function at run-time even after compression.

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    Domain: DecoratorsThe issue relates to the decorator syntaxIn DiscussionNot yet reached consensusSuggestionAn idea for TypeScript

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