Commits on Apr 6, 2019

1. THIS IS A WIP COMMIT FOR REVIEW ONLY, DO NOT MERGE …

   Docs and tests still TK.  Future commit message follows.
   
   ---
   
   feat: add processinfo index, add externalId
   
   If a NYC_PROCESSINFO_EXTERNAL_ID environment variable is set, then it is
   saved in the processinfo as `externalId`.
   
   BREAKING CHANGE: This adds a file named 'index.json' to the
   .nyc_output/processinfo directory, which has a different format from the
   other files in this dir.
   
   Furthermore, when this file is generated, some additional helpful
   metadata is memoized to the processinfo json files, to minimize the cost
   of repeated generation.  (This isn't necessarily a breaking change, but
   it is an update to the de facto schema for those files.)
   
   As soon as possible, index generation and process tree display should be
   migrated out to a new 'istanbul-lib-processinfo' library.
   
   This opens the door to add features in the v14 release family to improve
   support for partial/resumed test runs and file watching.
   
   - When a process is run with --clean=false and a previously seen
     externalId, clear away all the coverage files in the set for that
     externalId.
   - When a file is changed, a test runner can use the index to determine
     which tests (by externalId) ought to be re-run.

   

   isaacs committed Apr 6, 2019
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2. SQUASH: Update process index based on review …

   - Adds a NYC_PROCESS_ID to environment
   - Adds `parent` to processInfo object, a uuid referring to parent.
   - Rebase onto processinfo-numeric-pids branch
   - Avoid re-writing the processinfo/{uuid}.json files
   
   Next:
   
   - Update process tree output to rely on process index instead of
     duplicating effort.

   

   isaacs committed Apr 6, 2019
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3. SQUASH: generate process tree using processinfo index …

   Also, remove some unnecessary fields from process infos

   

   isaacs committed Apr 6, 2019
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4. Sort children when creating tree, for consistency

   

   isaacs committed Apr 6, 2019
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5. make the linter happy

   

   isaacs committed Apr 6, 2019
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6. remove unreachable code nit

   

   isaacs committed Apr 6, 2019
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