When set, Node.js will begin outputting [V8 JavaScript code coverage][] and
[Source Map][] data to the directory provided as an argument (coverage
information is written as JSON to files with a coverage prefix).
NODE_V8_COVERAGE will automatically propagate to subprocesses, making it
easier to instrument applications that call the child_process.spawn() family
of functions. NODE_V8_COVERAGE can be set to an empty string, to prevent
propagation.
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