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Version: 28.1

Environment Variables

Jest sets the following environment variables:

NODE_ENV

Set to 'test' if it's not already set to something else.

JEST_WORKER_ID

Each worker process is assigned a unique id (index-based that starts with 1). Each worker process is assigned a unique id (index-based that starts with 1). This is set to 1 for all tests when runInBand is set to true.