Node.js API compatibility - Fs

The fs (File System) library in Node.js provides an API for interacting with the file system. It allows developers to perform various file operations, such as reading, writing, updating, and deleting files and directories. The fs module is essential for applications that need to handle file input and output (I/O) operations.

/**
 * An example of using the Node.js fs module in Azion's runtime.
 * Support:
 * - Partially supported (Custom implementation)
 * @module runtime-apis/nodejs/fs/main
 * @example
 * // Execute with Azion Bundler:
 * npx edge-functions build
 * npx edge-functions dev
 */
import fs from "node:fs";

const main = async (event) => {
  // (Sync) in memory file system on bundle
  // to use sync (read) methods, you need config build.memoryFS (see in azion.config.cjs)
  const dataReadSync = fs.readFileSync("./hello.txt");
  console.log("Read File Sync", dataReadSync.toString());

  fs.writeFile("./hello1.txt", "Hello, Azion!", (err) => {
    if (err) {
      console.error(err);
    }
  });

  // (Async) in Azion's file system
  const data = await fs.promises.readFile("./hello.txt");
  console.log("Read File", data.toString());

  await fs.promises.writeFile("./hello2.txt", "Hello, Azion!");

  return new Response("Done!", { status: 200 });
};

export default main;