loop over files and read them async in typescript

To loop over files and read them async in TypeScript, you can use the fs module provided by Node.js. First, import the fs module and use the readdir method to get an array of file names from a directory. Then, use a for...of loop to loop over the file names, and use the readFile method to read each file asynchronously.

Here's an example:

index.ts
import * as fs from 'fs';

async function readFilesAsync() {
  try {
    const files = await fs.promises.readdir('/path/to/directory');
    for (const file of files) {
      const content = await fs.promises.readFile(`/path/to/directory/${file}`, 'utf-8');
      console.log(`Content of ${file}: ${content}`);
    }
  } catch (err) {
    console.error(err);
  }
}
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In this example, the readFilesAsync function first uses readdir to get an array of file names from the directory /path/to/directory. It then loops over the file names using a for...of loop, and for each file, uses readFile to read the file's contents asynchronously. Finally, it logs the contents of each file to the console.

Note that readFile takes a second argument, which specifies the encoding of the file's contents. In this example, the encoding is set to utf-8, which means the contents will be returned as a string. If you want to read the file as binary data, you can omit the second argument or set it to null.