fix(terser): don't assume code is running in worker created by the worker pool #1483
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Fixes issue shown at https://github.com/dumbmatter/rollup-terser-worker-threads by making sure the worker code is only executed when the worker was created by the worker pool.
Rollup Plugin Name:
terserThis PR contains:
Are tests included?
Breaking Changes?
If yes, then include "BREAKING CHANGES:" in the first commit message body, followed by a description of what is breaking.
List any relevant issue numbers: #1482
Description
Currently the worker only checks if it's not running on the main thread and then assumes that if it it isn't, it was created by the worker pool. This isn't true when Rollup itself is being run in a worker.