E0348: using a question mark as a prefix or suffix to make parameter types optional is invalid, use '| void' instead.
Using a question mark as a prefix or suffix to make parameter types optional is invalid. Instead add a second 'void' type to the parameter.
import * as fs from 'fs';
const file = "./out.txt";
const data = "test";
fs.promises.writeFile(file, data)
.then((err: Error?) => {
if (err) throw err;
});
To fix this warning, we need to replace the '?' suffix or prefix with the expression '| void'
import * as fs from 'fs';
const file = "./out.txt";
const data = "test";
fs.promises.writeFile(file, data)
.then((err: Error | void) => {
if (err) throw err;
});