@commitlint/rules/lib/header-case.js

Lint your commit messages

import { case as ensureCase } from "@commitlint/ensure";
import message from "@commitlint/message";
const negated = (when) => when === "never";
export const headerCase = (parsed, when = "always", value = []) => {
    const { header } = parsed;
    if (typeof header !== "string" || !header.match(/^[a-z]/i)) {
        return [true];
    }
    const checks = (Array.isArray(value) ? value : [value]).map((check) => {
        if (typeof check === "string") {
            return {
                when: "always",
                case: check,
            };
        }
        return check;
    });
    const matches = checks.filter((check) => {
        const r = ensureCase(header, check.case);
        return negated(check.when) ? !r : r;
    });
    const result = matches.length > 0;
    // A `never` rule fails because a case matched, so report the case(s) that
    // did. An `always` rule fails because none matched, so it keeps reporting
    // every configured case.
    const reported = negated(when) && result ? matches : checks;
    const list = reported.map((c) => c.case).join(", ");
    return [
        negated(when) ? !result : result,
        message([`header must`, negated(when) ? `not` : null, `be ${list}`]),
    ];
};
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