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

To use the ensureFileSync function from the fs-extra library in TypeScript, follow these steps:

1. Install the fs-extra library via npm:

index.ts
npm install --save fs-extra
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2. Import the ensureFileSync function in your TypeScript file:

index.ts
import { ensureFileSync } from 'fs-extra';
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3. Use the ensureFileSync function to ensure that a file exists, creating it if it doesn't:

index.ts
const filepath: string = '/path/to/file.txt';
ensureFileSync(filepath);
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The above code will create an empty file.txt at the specified file path if it doesn't already exist.

Note: ensureFileSync works synchronously and will block the main thread until the file check/creation is completed. If you need to perform this operation asynchronously, consider using ensureFile function from fs-extra or wrap in a Promise with fs's native access and writeFile functions.

index.ts
import { promises as fsPromises } from 'fs';

// async/await version
const filepath: string = '/path/to/file.txt';

async function ensureFileAsync(): Promise<void> {
  try {
    await fsPromises.access(filepath, fsPromises.constants.F_OK);
  } catch {
    await fsPromises.writeFile(filepath, '');
  }
}

ensureFileAsync().catch(err => {
  console.error(err);
});
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