Okay let's try using bash expansion instead

Author: smashwilson

azure-pipelines.yml

@@ -41,12 +41,11 @@ jobs:
     condition: succeededOrFailed()
   - bash: |
       env
-      bash <(curl -s https://codecov.io/bash) -n "Linux $(atom_channel)" -P "${VCS_PULL_REQUEST}" -B "${VCS_BRANCH_NAME}"
+      bash <(curl -s https://codecov.io/bash) -n "Linux $(atom_channel)" -P "${SYSTEM_PULLREQUEST_PULLREQUESTNUMBER:-}" -B "${VCS_BRANCH_NAME}"
     displayName: publish code coverage to CodeCov
     env:
       CODECOV_TOKEN: $(codecov.token)
       VCS_BRANCH_NAME: $[coalesce(variables.System.PullRequest.SourceBranch, variables.Build.SourceBranch)]
-      VCS_PULL_REQUEST: $[coalesce(variables.System.PullRequest.PullRequestNumber, '')]
     condition: succeededOrFailed()
   - task: PublishCodeCoverageResults@1
     inputs:
@@ -84,12 +83,11 @@ jobs:
   - bash: npm run report:coverage
     displayName: generate code coverage reports
     condition: succeededOrFailed()
-  - bash: bash <(curl -s https://codecov.io/bash) -n "MacOS $(atom_channel)" -P "${VCS_PULL_REQUEST}" -B "${VCS_BRANCH_NAME}"
+  - bash: bash <(curl -s https://codecov.io/bash) -n "MacOS $(atom_channel)" -P "${SYSTEM_PULLREQUEST_PULLREQUESTNUMBER:-}" -B "${VCS_BRANCH_NAME}"
     displayName: publish code coverage to CodeCov
     env:
       CODECOV_TOKEN: $(codecov.token)
       VCS_BRANCH_NAME: $[coalesce(variables.System.PullRequest.SourceBranch, variables.Build.SourceBranch)]
-      VCS_PULL_REQUEST: $[coalesce(variables.System.PullRequest.PullRequestNumber, '')]
     condition: succeededOrFailed()
   - task: PublishCodeCoverageResults@1
     inputs:
@@ -147,12 +145,11 @@ jobs:
   - powershell: npm run report:coverage
     displayName: generate code coverage reports
     condition: succeededOrFailed()
-  - bash: bash <(curl -s https://codecov.io/bash) -n "Windows $(atom_channel)"  -P "${VCS_PULL_REQUEST}" -B "${VCS_BRANCH_NAME}"
+  - bash: bash <(curl -s https://codecov.io/bash) -n "Windows $(atom_channel)"  -P "${SYSTEM_PULLREQUEST_PULLREQUESTNUMBER:-}" -B "${VCS_BRANCH_NAME}"
     displayName: publish code coverage to CodeCov
     env:
       CODECOV_TOKEN: $(codecov.token)
       VCS_BRANCH_NAME: $[coalesce(variables.System.PullRequest.SourceBranch, variables.Build.SourceBranch)]
-      VCS_PULL_REQUEST: $[coalesce(variables.System.PullRequest.PullRequestNumber, '')]
     condition: succeededOrFailed()
   - task: PublishCodeCoverageResults@1
     inputs: