Using fs.read inside promise does not work - node.js

Question

I am trying to do a fs.read after the promise job is done by using the .then()
Here is how my code looks like
(async () => {
const feed = await parser.parseURL('https://www.nasa.gov/rss/dyn/breaking_news.rss');
console.log(feed.title);
const items = [];
await Promise.all(feed.items.map(async (currentItem) => {
// some code here to create data
items.push(data);
})).then(
items.forEach((element) => {
const file = downloadFile(element.url);
let checksumValue;
try {
fs.readFileSync(file, (_err, data) => {
checksumValue = generateChecksum(data);
console.log(`The checksum is: ${checksumValue}`);
// Delete the downloaded file
deleteFile(file);
});
} catch (error) {
console.error(error);
// expected output: ReferenceError: nonExistentFunction is not defined
// Note - error messages will vary depending on browse
}
})(),
);
})();
But it doesn't operate this piece of code :
fs.readFileSync(file, (_err, data) => {
checksumValue = generateChecksum(data);
console.log(`The checksum is: ${checksumValue}`);
// Delete the downloaded file
deleteFile(file);
});
How should I read the file?

Answer 1

fs.readFileSync is sync, so it doesn't take a callback.
Either use the non-sync version:
fs.readFile(file, (_err, data) => {
checksumValue = generateChecksum(data);
console.log(`The checksum is: ${checksumValue}`);
// Delete the downloaded file
deleteFile(file);
});
or use it as intended:
const data = fs.readFileSync(file);
checksumValue = generateChecksum(data);
console.log(`The checksum is: ${checksumValue}`);
// Delete the downloaded file
deleteFile(file);