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

To use the createWriteStream function from the fs-extra library in Typescript, you need to install the @types/fs-extra package from npm. This package contains the type definitions for fs-extra, so you can use the functions in your Typescript code without any errors.

Here's an example of how to use the createWriteStream function to create a new file and write data to it:

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

const filePath = 'path/to/file.txt';
const data = 'Hello World!';

const stream = fs.createWriteStream(filePath);
stream.write(data, (error: Error | null) => {
  if (error) {
    console.error(error);
  } else {
    console.log(`Data written to ${filePath}`);
  }
});
301 chars
14 lines

In the example, we first import the fs-extra module using the import statement. We then define the path to the file we want to create and the data we want to write to it.

Next, we use the createWriteStream function to create a writable stream to the file path. This returns a stream object that we can use to write data to the file.

We then write the data to the stream using its write method. The write method takes the data to write as the first argument and a callback function that will be called when the write operation is complete. If there is an error during the write operation, the error will be passed as the first argument to the callback function.

Finally, we log a success message if the write operation is successful or an error message if there's an error.

Note that you can also use the createWriteStream function to append data to an existing file by passing { flags: 'a' } as the second argument to the function.