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

Lint your commit messages

import { spawnSync } from "node: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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