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const fs = require("fs");const { dirname } = require("path");const { promisify } = require("util");const { parse } = require("esm-cjs-lexer");const enhancedResolve = require("enhanced-resolve");
const identRegexp = /^[a-zA-Z_\$][a-zA-Z0-9_\$]*$/;const resolve = promisify(enhancedResolve.create({  conditionNames: ["require", "node", "default"],  extensions: [".cjs", ".js", ".json"],}));const reservedWords = new Set([  "abstract",  "arguments",  "await",  "boolean",  "break",  "byte",  "case",  "catch",  "char",  "class",  "const",  "continue",  "debugger",  "default",  "delete",  "do",  "double",  "else",  "enum",  "eval",  "export",  "extends",  "false",  "final",  "finally",  "float",  "for",  "function",  "goto",  "if",  "implements",  "import",  "in",  "instanceof",  "int",  "interface",  "let",  "long",  "native",  "new",  "null",  "package",  "private",  "protected",  "public",  "return",  "short",  "static",  "super",  "switch",  "synchronized",  "this",  "throw",  "throws",  "transient",  "true",  "try",  "typeof",  "var",  "void",  "volatile",  "while",  "with",  "yield",]);const builtInNodeModules = new Set([  "assert",  "async_hooks",  "child_process",  "cluster",  "buffer",  "console",  "constants",  "crypto",  "dgram",  "dns",  "domain",  "events",  "fs",  "fs/promises",  "http",  "http2",  "https",  "inspector",  "module",  "net",  "os",  "path",  "path/posix",  "path/win32",  "perf_hooks",  "process",  "punycode",  "querystring",  "readline",  "repl",  "stream",  "stream/promises",  "stream/web",  "_stream_duplex",  "_stream_passthrough",  "_stream_readable",  "_stream_transform",  "_stream_writable",  "string_decoder",  "sys",  "timers",  "tls",  "trace_events",  "tty",  "url",  "util",  "v8",  "vm",  "worker_threads",  "zlib",]);
function isObject(v) {  return typeof v === "object" && v !== null && !Array.isArray(v);}
function getJSONKeys(jsonFile) {  const content = fs.readFileSync(jsonFile, "utf-8");  const v = JSON.parse(content);  if (isObject(v)) {    return Object.keys(v);  }  return [];}
function verifyExports(names) {  const exportDefault = names.includes("default");  const exports = Array.from(    new Set(      names.filter((name) =>        identRegexp.test(name) && !reservedWords.has(name)      ),    ),  );  return {    exportDefault,    exports,  };}
async function parseCjsExports(input) {  const { cwd, importPath, requireMode, nodeEnv = "production" } = input;  const entry = importPath.startsWith("/") && /\.(js|cjs)$/.test(importPath)    ? importPath    : await resolve(cwd, importPath);  const exports = [];
  if (requireMode) {    process.env.NODE_ENV = nodeEnv;    const mod = require(entry);    if (isObject(mod) || typeof mod === "function") {      for (const key of Object.keys(mod)) {        if (typeof key === "string" && key !== "") {          exports.push(key);        }      }    }    return verifyExports(exports);  }
  if (entry.endsWith(".json")) {    return verifyExports(getJSONKeys(entry));  }
  if (    !entry.endsWith(".js") && !entry.endsWith(".cjs") && !entry.endsWith(".mjs")  ) {    return verifyExports(exports);  }
  const requires = [{ path: entry, callMode: false }];  while (requires.length > 0) {    const req = requires.pop();    try {      const filename = req.path.replace(/\0/g, "");      const code = fs.readFileSync(filename, "utf-8");      const results = parse(filename, code, {        nodeEnv,        callMode: req.callMode,      });      if (        results.reexports.length === 1 &&        /^[a-z@]/i.test(results.reexports[0]) &&        !results.reexports[0].endsWith("()") &&        !builtInNodeModules.has(results.reexports[0]) &&        results.exports.length === 0 &&        exports.length === 0      ) {        return {          reexport: results.reexports[0],          exportDefault: false,          exports: [],        };      }      exports.push(...results.exports);      for (let reexport of results.reexports) {        const callMode = reexport.endsWith("()");        if (callMode) {          reexport = reexport.slice(0, -2);        }        if (builtInNodeModules.has(reexport)) {          const mod = require(reexport);          exports.push(...Object.keys(mod));        } else {          const path = await resolve(dirname(filename), reexport);          if (path.endsWith(".json")) {            exports.push(...getJSONKeys(path));          } else {            requires.push({ path, callMode });          }        }      }    } catch (err) {      return Promise.reject(err);    }  }
  return verifyExports(exports);}
function readStdin() {  return new Promise((resolve) => {    let buf = "";    process.stdin.setEncoding("utf8");    process.stdin.on("data", (chunk) => (buf += chunk));    process.stdin.on("end", () => resolve(buf));  });}
async function main() {  try {    const input = JSON.parse(await readStdin());    const outout = await parseCjsExports(input);    process.stdout.write(JSON.stringify(outout));  } catch (err) {    process.stdout.write(      JSON.stringify({ error: err.message, stack: err.stack }),    );  }  process.exit(0);}
main();