GitHub - close PRs with no linked issues (Bash script)

gh-close-prs.bash

#!/bin/bash

set -e

owner=""        # owner name here
repo=""         # repo name here

prs=$(gh pr list --repo "$owner/$repo" --json number --jq '.[] | join("")')

for pr in $prs; do
    issue=$(gh api graphql -F owner="$owner" -F repo="$repo" -F pr="$pr" -f query='
        query ($owner: String!, $repo: String!, $pr: Int!) {
            repository(owner: $owner, name: $repo) {
                pullRequest(number: $pr) {
                    closingIssuesReferences(first: 100) {
                        nodes {
                            number
                        }
                    }
                }
            }
        }'  --jq '.data.repository.pullRequest.closingIssuesReferences.nodes[].number')

    if [[ -z $issue ]]; then
        echo "PR [$pr] linked issue not found, closing"
        gh pr close --repo "$owner/$repo" "$pr"
    else
        echo "PR [$pr] linked issue found: $issue"
    fi
done