how to use the readstream function from the fs-extra library in typescript

To use the readStream function from the fs-extra library in TypeScript, you first need to install the library:

index.ts
npm install fs-extra
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Then you can import the fs-extra module and use the createReadStream method to create a readable stream for a file:

index.ts
import * as fs from 'fs-extra';
import * as path from 'path';

const filePath = path.join(__dirname, 'file.txt');
const stream = fs.createReadStream(filePath, { encoding: 'utf8' });

stream.on('data', (chunk: string) => {
  console.log(chunk);
});

stream.on('end', () => {
  console.log('File reading completed.');
});

stream.on('error', (err: Error) => {
  console.error('Error reading file:', err);
});
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In this example, we create a readable stream for a file called file.txt using the createReadStream method from the fs-extra module. We then set up event listeners for the 'data', 'end', and 'error' events on the stream.

The 'data' event is emitted whenever a new chunk of data is available to read from the stream. We log each chunk to the console in this example.

The 'end' event is emitted when the entire file has been read. We log a message to the console indicating that file reading has completed.

The 'error' event is emitted if an error occurs while reading the file. We log the error to the console in this example.