@donmahallem/label-pr/src/sync-pr-labels.ts

Helpers for working with github issue labels

/**
 * Package @donmahallem/label-pr
 * Source https://donmahallem.github.io/js-libs/
 */

import { calculateLabelDiff, getPullRequestLabels, syncLabels, GithubLabel, ILabelDiff } from '@donmahallem/label-gh';
import { Octokit } from '@octokit/core';

export interface IOpts {
    /**
     * Issue or pull request number
     */
    pull_number: number;
    /**
     * Repository owner
     */
    owner: string;
    /**
     * Repository name
     */
    repo: string;
}
export const syncPRLabels = async (octokit: Octokit, opts: IOpts, packageLabel: string[], prefix = 'pkg'): Promise<GithubLabel[]> => {
    const expectedLabels: string[] = packageLabel.map((baseLabel: string): string => {
        return `${prefix}:${baseLabel}`;
    });
    const prLabels: Partial<GithubLabel>[] = await getPullRequestLabels(octokit, opts);
    const prLabelNames: string[] = prLabels
        .map((lab: GithubLabel): string | undefined => {
            return lab.name;
        })
        .filter((label: string | undefined): boolean => {
            // tslint:disable-next-line:triple-equals
            return label != undefined;
        }) as string[];
    const diff: ILabelDiff = calculateLabelDiff(expectedLabels, prLabelNames);
    const finalLabels: string[] = [];
    finalLabels.push(...diff.add);
    finalLabels.push(...diff.unchanged);
    finalLabels.push(
        ...diff.remove.filter((label: string): boolean => {
            return !label.startsWith(`${prefix}:`);
        })
    );
    return syncLabels(
        octokit,
        {
            issue_number: opts.pull_number,
            owner: opts.owner,
            repo: opts.repo,
        },
        finalLabels,
        true
    );
};