Enhancement: SWC_DEBUG environment variable

[lily-mara]

Currently, if the Rust swc library aborts in a release build, there is no information given to the user about what caused it. I would like to propose that an environment variable SWC_DEBUG set to 1, or some other sentinel string, would cause swc to print out the name of the file that it is about to try to transform. Currently, when you want to track down the source of an abort, you need to modify the source to include this extra logging. It would be very convenient if this information was presented to the user without too much extra effort.

[lily-mara]

Or the env_logger crate could be used to control this behavior as well

[kdy1]

I updated node-swc to emit the file name when SWC_DEBUG is 1 or true.

[swc-bot]

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