* draft: showConfig support
* feat: pass through showConfig command options
* update test file
* refactor: add createLogger to makeChainWalker
* serializing dynamic plugin instance
* fix flow errors
* chore: add tests on extended config
* fix: do not print empty presets
* add more test cases
* add windows testcases
* address review comments
* throw error when showConfigPath does not exist
* print reason when showConfig is targetting an ignored file
* remove showConfig: boolean
* refactor: simplify environment flag name
* rename test fixtures
* fix: throw when SHOW_CONFIG_FOR is not a regular file
* cleanup test fixtures
* add test on only
* Update packages/babel-core/src/config/files/configuration.js
Co-authored-by: Brian Ng <bng412@gmail.com>
* address review comments
* update test fixtures
* feat: sort config items in ascending priority
Co-authored-by: Brian Ng <bng412@gmail.com>
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