linear_issue_open.yml

name: Sync GitHub Issues to Linear

on:
  issues:
    types: [opened, reopened]
  pull_request:
    types: [opened, reopened]

jobs:
  sync-to-linear:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: "20"

      - name: Create Linear Issue
        uses: actions/github-script@v7
        env:
          LINEAR_API_KEY: ${{ secrets.LINEAR_API_KEY }}
        with:
          script: |
            const event = context.payload;
            const isIssue = !!event.issue;
            const title = isIssue ? event.issue.title : event.pull_request.title;
            const body = isIssue ? event.issue.body : event.pull_request.body;
            const url = isIssue ? event.issue.html_url : event.pull_request.html_url;

            const query = `
              mutation CreateIssue($input: IssueCreateInput!) {
                issueCreate(input: $input) {
                  success
                  issue {
                    id
                    identifier
                    url
                  }
                }
              }
            `;

            const variables = {
              input: {
                title: title,
                description: `${body}\n\nOriginal ${isIssue ? 'Issue' : 'PR'}: ${url}`,
                teamId: process.env.LINEAR_TEAM_ID,
                labelIds: process.env.LINEAR_LABEL_IDS?.split(',')
              }
            };

            try {
              const response = await fetch('https://api.linear.app/graphql', {
                method: 'POST',
                headers: {
                  'Content-Type': 'application/json',
                  'Authorization': process.env.LINEAR_API_KEY
                },
                body: JSON.stringify({
                  query,
                  variables
                })
              });

              const data = await response.json();

              if (data.errors) {
                core.setFailed(`Failed to create Linear issue: ${JSON.stringify(data.errors)}`);
                return;
              }

              // Comment on the GitHub issue/PR with the Linear link
              const linearIssue = data.data.issueCreate.issue;
              const comment = `Created Linear issue: ${linearIssue.identifier} (${linearIssue.url})`;

              if (isIssue) {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: event.issue.number,
                  body: comment
                });
              } else {
                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: event.pull_request.number,
                  body: comment
                });
              }

            } catch (error) {
              core.setFailed(`Error: ${error.message}`);
            }