@wroud/conventional-commits-parser/lib/parseConventionalCommit.js

A lightweight parser for conventional commits that supports extracting commit metadata, generating commit messages, and managing commit trailers in TypeScript.

const headerRegex = /^(?<type>[\w-]+)(\((?<scope>[\w-]+)\))?(?<breaking>!)?:\s(?<description>[\S\s]*)/;
export function parseConventionalCommit(commitInfo) {
    const match = headerRegex.exec(commitInfo.subject);
    if (!match) {
        return null;
    }
    const breakingChanges = [];
    const { type, breaking, scope, description } = match.groups;
    const rawBody = commitInfo.body?.trim() || "";
    if (breaking) {
        if (rawBody) {
            breakingChanges.push(rawBody);
        }
        else {
            breakingChanges.push(description);
        }
    }
    for (const trailer of commitInfo.trailers) {
        const value = trailer.value.trim();
        if (trailer.token === "BREAKING CHANGE" ||
            trailer.token === "BREAKING-CHANGE") {
            breakingChanges.push(value);
            continue;
        }
    }
    const body = rawBody || undefined;
    const uniqueBreakingChanges = Array.from(new Set(breakingChanges));
    return {
        commitInfo,
        type: type.toLowerCase(),
        scope: scope || undefined,
        description,
        body,
        breakingChanges: uniqueBreakingChanges,
    };
}
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