@commitlint/rules/lib/trailer-exists.js

Lint your commit messages

import { spawnSync } from 'child_process';
import message from '@commitlint/message';
import toLines from '@commitlint/to-lines';
export const trailerExists = (parsed, when = 'always', value = '') => {
    const trailers = spawnSync('git', ['interpret-trailers', '--parse'], {
        input: parsed.raw || '',
    }).stdout;
    const matches = toLines(trailers.toString()).filter((ln) => ln.startsWith(value)).length;
    const negated = when === 'never';
    const hasTrailer = matches > 0;
    return [
        negated ? !hasTrailer : hasTrailer,
        message([
            'message',
            negated ? 'must not' : 'must',
            'have `' + value + '` trailer',
        ]),
    ];
};
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