Error: Cannot use import statement outside a module

Error: Compilation of pageFunction failed.
2023-03-02T03:33:45.814Z   Cannot use import statement outside a module
2023-03-02T03:33:45.816Z       import fs from 'fs';
2023-03-02T03:33:45.818Z   SyntaxError: Cannot use import statement outside a module

async function pageFunction(context) {

    const { page, request, log } = context;

    import fs from 'fs';

    await page._client.send('Page.setDownloadBehavior', {behavior: 'allow', downloadPath: './my-downloads'})

    await page.click('span.dig-Button-content:contains("Download")');

    const fileNames = fs.readdirSync('./my-downloads');

    // Let's pick the first one
    const fileData = fs.readFileSync(`./my-downloads/${fileNames[0]}`);

    const base64PDF = Buffer.from(fileData).toString('base64');

    return {
        url: request.url,
        base64PDF: base64PDF
    };
}