@dapplion/benchmark/lib/esm/utils/defaultBranch.js

Ensures that new code does not introduce performance regressions with CI. Tracks:

import { isGaRun } from "../github/context.js";
import { getGithubDefaultBranch } from "../github/octokit.js";
import { shell } from "./shell.js";
let defaultBranch = null;
/**
 * Return a cached value of a best guess of the repo's default branch
 */
export async function getDefaultBranch(opts) {
    if (opts?.defaultBranch) {
        return opts.defaultBranch;
    }
    if (defaultBranch === null) {
        defaultBranch = isGaRun() ? await getGithubDefaultBranch() : await guessLocalDefaultBranch();
    }
    return defaultBranch;
}
async function guessLocalDefaultBranch() {
    const branchesRes = await shell("git branch --all --format='%(refname:short)'");
    const branches = branchesRes.split("\n");
    const branchSet = new Set(branches);
    for (const branch of ["main", "master"]) {
        if (branchSet.has(branch) || branchSet.has(`origin/${branch}`))
            return branch;
    }
    throw Error("Could not figure out local default branch. Use persistBranches option");
}