@commitlint/rules/lib/subject-exclamation-mark.js

Lint your commit messages

import message from "@commitlint/message";
export const subjectExclamationMark = (parsed, when = "always") => {
    const input = parsed.header;
    if (!input) {
        return [true, ""];
    }
    const negated = when === "never";
    const hasExclamationMark = /!:/.test(input);
    return [
        negated ? !hasExclamationMark : hasExclamationMark,
        message([
            "subject",
            negated ? "must not" : "must",
            "have an exclamation mark in the subject to identify a breaking change",
        ]),
    ];
};
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