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fix(mergeMap): fix nested mergeMaps #4072

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merged 4 commits into from Aug 31, 2018
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cartant
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@cartant cartant commented Aug 31, 2018

Description:

This PR should fix the nested concatMap/mergeMap regression. The problem seems to have been related to a subscriber being added to itself as a parent.

Related issue (if exists): #4071

@filipesilva
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The Appveyor CI is failing on the new test:


  1) mergeMap
       should support nested merges:
      Uncaught AssertionError: expected [] to deeply equal [ 3, 'done' ]
      + expected - actual
      -[]
      +[
      +  3
      +  "done"
      +]
      
      at Proxy.assertEqual (node_modules\chai\lib\chai\core\assertions.js:1020:19)
      at Proxy.methodWrapper (node_modules\chai\lib\chai\utils\addMethod.js:57:25)
      at Timeout._onTimeout (spec\operators\mergeMap-spec.ts:737:31)

Odd it didn't fail on other platforms. Might be a race condition.

@cartant
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cartant commented Aug 31, 2018

Might be a race condition.

Most likely. I've changed that test to use the micro task scheduler, so the setTimeout should always happen last, now.

@benlesh
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benlesh commented Aug 31, 2018

Thanks @cartant! You saved me some work this morning for sure. That was first on my agenda today. <3

@benlesh benlesh merged commit 0ab701b into ReactiveX:master Aug 31, 2018
@lock lock bot locked as resolved and limited conversation to collaborators Sep 30, 2018
@cartant cartant deleted the issue-4071 branch September 24, 2020 07:07
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3 participants