@commitlint/rules/lib/signed-off-by.js

Lint your commit messages

import message from "@commitlint/message";
import toLines from "@commitlint/to-lines";
const CHERRY_PICK_REGEX = /^\(cherry picked from commit [0-9a-f]{7,64}\)$/i;
export const signedOffBy = (parsed, when = "always", value = "") => {
    const lines = toLines(parsed.raw).filter((ln) => 
    // skip comments
    !ln.startsWith("#") &&
        // skip cherry pick commits
        !CHERRY_PICK_REGEX.test(ln.trim()) &&
        // ignore empty lines
        Boolean(ln));
    const last = lines[lines.length - 1];
    const negated = when === "never";
    const hasSignedOffBy = 
    // empty commit message
    last ? last.startsWith(value) : false;
    return [
        negated ? !hasSignedOffBy : hasSignedOffBy,
        message(["message", negated ? "must not" : "must", "be signed off"]),
    ];
};
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