backport/dist/src/lib/github/v4/fetch-existing-pull-request.js

A CLI tool that automates the process of backporting commits

import { first } from 'lodash-es';
import { graphql } from '../../../graphql/generated/index.js';
import { BackportError } from '../../backport-error.js';
import { graphqlRequest } from './client/graphql-client.js';
export async function fetchExistingPullRequest({ options, prPayload, }) {
    const { githubApiBaseUrlV4, githubToken } = options;
    const query = graphql(`
    query ExistingPullRequest(
      $repoOwner: String!
      $repoName: String!
      $base: String!
      $head: String!
    ) {
      repository(owner: $repoOwner, name: $repoName) {
        name
        ref(qualifiedName: $head) {
          name
          associatedPullRequests(
            first: 1
            states: OPEN
            baseRefName: $base
            headRefName: $head
          ) {
            edges {
              node {
                number
                url
              }
            }
          }
        }
      }
    }
  `);
    const { repoForkOwner, head } = splitHead(prPayload);
    const variables = {
        repoOwner: repoForkOwner,
        repoName: prPayload.repo,
        base: prPayload.base,
        head: head,
    };
    const result = await graphqlRequest({ githubToken, githubApiBaseUrlV4 }, query, variables);
    if (result.error) {
        throw new BackportError({
            code: 'github-api-exception',
            message: result.error.message,
        });
    }
    const existingPullRequest = first(result.data?.repository?.ref?.associatedPullRequests.edges);
    if (!existingPullRequest?.node) {
        return;
    }
    return {
        url: existingPullRequest.node.url,
        number: existingPullRequest.node.number,
    };
}
function splitHead(prPayload) {
    const [repoForkOwner, head] = prPayload.head.split(':');
    return { repoForkOwner, head };
}
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