header-trim.ts

import message from '@commitlint/message';
import {SyncRule} from '@commitlint/types';

export const headerTrim: SyncRule = (parsed) => {
	const {header} = parsed;

	const startsWithWhiteSpace = header !== header.trimStart();
	const endsWithWhiteSpace = header !== header.trimEnd();

	switch (true) {
		case startsWithWhiteSpace && endsWithWhiteSpace:
			return [
				false,
				message(['header', 'must not be surrounded by whitespace']),
			];

		case startsWithWhiteSpace:
			return [false, message(['header', 'must not start with whitespace'])];

		case endsWithWhiteSpace:
			return [false, message(['header', 'must not end with whitespace'])];

		default:
			return [true];
	}
};