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process: backport process.emitWarning() API

Rodrigo Muino Tomonari requested to merge github/fork/jasnell/backport-emitwarning into v4.x-staging

Backport of the process.emitWarning() API to Node.js 4.x

Includes:

  • The process.emitWarning() method
  • The --no-warnings and --trace-warnings command line flags
  • The NODE_NO_WARNINGS environment variable
  • The --redirect-warnings=file command line flag
  • The NODE_REDIRECT_WARNINGS environment variable

This does not change any of the existing deprecation or warning notices emitted by Node.js itself as that would be a breaking semver-major change. Accordingly, the command line flags and environment variables have no impact on deprecation warnings.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines
Affected core subsystem(s)

process

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