Mistaken type checking error about actionlint HOT 7 CLOSED

The error looks correct. The PR matrix value is an array because it is generated by filter syntax (github.event.workflow_run.pull_requests.*.number). An array value can not be embedded with ${{ }} syntax directly. I think probably what you want to do is:

- run: echo '${{ toJSON(matrix.PR) }}'

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But matrix.PR is a scalar when evaluated inside the run: statement because of the way GitHub Actions handles matrix, so doing

- run: echo '${{ matrix.PR }}'

is not an error.

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But matrix.PR is a scalar when evaluated inside the run: statement

That's because the result of the filter syntax happened to be an array with a single element, am I correct? If the result contained two elements, the result would've been different.

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That's because the result of the filter syntax happened to be an array with a single element, am I correct?

No, that is not correct.

If the result contained two elements, the result would've been different.

github.event.workflow_run.pull_requests.*.number can contain any number of elements. Regardless of the number of elements this array contains, in the context of run:, matrix.PR is always a scalar (conditional on the run: statement being reached).

Please see: https://docs.github.com/en/actions/using-jobs/using-a-matrix-for-your-jobs

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Oh, OK, I misread your workflow. Yes, since it is a row of matrix, the value should be scalar. Thanks for your explanation.

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Thanks, @rhysd!

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@carlocab This was a bug of actionlint. Thank you for your report with the nice reproduction.

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