Generate changelog for ECharts

generate-changelog.js

const { Octokit } = require('@octokit/rest');

const octokit = new Octokit({
    // auth: ''
});

const OWNER = 'apache';
const REPO = 'incubator-echarts';
const MILESTONE = 21;

async function generates() {

    const desc = [];

    const issues = await octokit.issues.listForRepo({
        owner: OWNER,
        repo: REPO,
        state: 'closed',
        milestone: MILESTONE
    });

    const addedMap = {};

    function addItem(issue) {
        if (addedMap[issue.number]) {
            return;
        }

        const repoName = issue.repository
            ? issue.repository.full_name
            : `${OWNER}/${REPO}`;
        console.log(`added ${repoName}#${issue.number}`);
        addedMap[issue.number] = true;

        desc.push(
`+ ${issue.title} [#${issue.number}](https://github.com/${repoName}/issues/${issue.number}) ([${issue.user.login}](${issue.user.html_url}))`
        );
    }

    for (let issue of issues.data) {
        let added = false;
        // Is a pull request
        if (issue.pull_request) {
            addItem(issue);
            added = true;
        }
        else {
            const events = await octokit.issues.listEventsForTimeline({
                owner: OWNER,
                repo: REPO,
                per_page: 100,
                issue_number: issue.number
            });
            // Find referenced pull request.
            for (let event of events.data) {
                if (event.event === 'cross-referenced') {
                    if (event.source.issue.pull_request) {
                        addItem(event.source.issue);
                        added = true;
                    }
                }
            }
        }
        if (!added) {
            console.log(`${issue.number} not added`);
        }
    }

    return desc.join('\n');
}

generates().then(str => {
    console.log(str);
});