dangerfile.js

const { danger, message, fail, warn, schedule } = require('danger');
const { default: jiraIssue } = require('danger-plugin-jira-issue');
// const { default: noConsole } = require("danger-plugin-no-console"); this plugin has some issues

const PR_REVIEWS_CHECKS = Object.freeze({
    BIG_PR_THRESHOLD: 700,
    REMOVED_LINE_THRESHOLD: 200,
    TEAMS_INITIALS: ['FW', 'TD', 'FF', 'FWH', 'FFH', 'TDH'],
    WARNS: {
        TITLE: `Title required Issue number`,
        CHECK_LOCK_FILE: `:exclamation: Changes were made to package.json, but not to package-lock.json - <i>'Perhaps you need to run \`npm install\`?'`,
        WIP: `PR is classed as Work in Progress`,
        EXCEED_THRESHOLD: `:exclamation: Your PR has over 700 lines of code, please consider breaking it down so we can effectively review it. :thumbsup:`,
        MERGE_CONFLICTS: `Please merge development branch`,
        ONLY_DEV_BRANCH: `:exclamation: Please re-submit this PR to development branch, we may have already fixed your issue. 🙏`,
        MISSING_DES: `:exclamation: Please add a description to your PR to make it easier to review`,
        MERGE_COMMITS: `Please rebase to get rid of the merge commits in this PR 🙏`,
        FILE_ISSUE: `Please file the issue for development branch`,
        PATH_WARN: `Make sure to file it for development branch as well`,
        REVIEWER_REQ: `:exclamation: Please make sure to assign reviewer in this PR`,
        PACKAGE_JSON_ERR: `Changes were made to package.json, but not to package-lock.json - <i>'Perhaps you need to run \`npm install\`?'`,
    },
    SUCCESS: {
        LINES_REMOVED: `:tada: The PR removed ${danger.github.pr.deletions} lines. :clap:`,
        NEW_FILES: `New Files in this PR: \n - `,
    },
});

const checkDangerJS = async () => {
    // check if PR is in WIP
    if (danger.github.pr.title.toLowerCase().includes('[wip]'))
        return warn(PR_REVIEWS_CHECKS.WARNS.WIP);

    //Accept PR only for development branch and warn
    if (danger.github.pr.head.ref == 'master')
        warn(PR_REVIEWS_CHECKS.WARNS.ONLY_DEV_BRANCH);

    //checks for description
    const isDesAdded = danger.github.pr.body.length <= 10;
    isDesAdded && fail(PR_REVIEWS_CHECKS.WARNS.MISSING_DES);

    // new Files in the PR
    const newFiles = danger.git.created_files.join(' , ') || 0;
    message(`${PR_REVIEWS_CHECKS.SUCCESS.NEW_FILES} ${newFiles}`);

    // check PR is changes Threshold
    const removedLines = danger.github.pr.deletions,
        totalChanges =
            danger.github.pr.additions + removedLines >
            PR_REVIEWS_CHECKS.BIG_PR_THRESHOLD;
    totalChanges && warn(PR_REVIEWS_CHECKS.WARNS.EXCEED_THRESHOLD);

    // check PR delete lines status
    if (removedLines > PR_REVIEWS_CHECKS.REMOVED_LINE_THRESHOLD)
        message(PR_REVIEWS_CHECKS.SUCCESS.LINES_REMOVED);

    // check if PR has some merge conflicts
    const mergeCommits = danger.github.commits.filter(({ commit }) => {
        commit.message.includes(`Merge branch development`);
    });
    if (mergeCommits.length) fail(PR_REVIEWS_CHECKS.WARNS.MERGE_COMMITS);

    // Check if package.json is modified but package-lock.json is modified or not
    // ideally both should be modified
    const packageChanged = danger.git.modified_files.includes('package.json'),
        lockfileChanged = danger.git.modified_files.includes(
            'package-lock.json'
        );
    if (packageChanged && !lockfileChanged)
        fail(PR_REVIEWS_CHECKS.WARNS.PACKAGE_JSON_ERR);

    //checks for console.log in PR
    // schedule(noConsole({ whitelist: ['error', 'warn'] }))

    jiraIssue({
        key: PR_REVIEWS_CHECKS.TEAMS_INITIALS,
        url: 'https://kommunicate.atlassian.net/browse',
        format(emoji, jiraUrls) {
            return `Jira Issue Link - ${emoji} ${jiraUrls}`;
        },
        fail_on_warning: false,
    });
};

checkDangerJS();