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import { readdir, readFile } from "node:fs/promises";

import { dirname, extname, join, resolve } from "node:path";

import { access } from "node:fs/promises";

import { fileURLToPath } from "node:url";

const root = fileURLToPath(new URL("..", import.meta.url));

const ignored = new Set([".git", "node_modules", "dist", "coverage"]);

async function markdownFiles(directory) {

const output = [];

for (const entry of await readdir(directory, { withFileTypes: true })) {

if (entry.isDirectory() && ignored.has(entry.name)) continue;

const path = join(directory, entry.name);

if (entry.isDirectory()) output.push(...await markdownFiles(path));

else if (entry.isFile() && extname(entry.name) === ".md") output.push(path);

}

return output;

}

const broken = [];

for (const source of await markdownFiles(root)) {

const content = await readFile(source, "utf8");

for (const match of content.matchAll(/\[[^\]]*\]\(([^)]+)\)/g)) {

const target = match[1]?.trim();

if (!target || /^(?:https?:|mailto:|#)/i.test(target) || target.includes("<OWNER>")) continue;

const withoutAnchor = decodeURIComponent(target.split("#")[0] ?? "");

try {

await access(resolve(dirname(source), withoutAnchor));

} catch {

broken.push(`${source.slice(root.length + 1)} -> ${target}`);

}

}

}

if (broken.length) {

process.stderr.write(`Broken local Markdown links:\n${broken.map((item) => ` ${item}`).join("\n")}\n`);

process.exitCode = 1;

} else {

process.stdout.write("Local Markdown links passed.\n");

}