E0308: TypeScript optional parameters are not allowed in JavaScript
In TypeScript, parameters can be explicitly marked as optional. It is a syntax
error to write ?
to mark a parameter optional in JavaScript:
async function download(uri, options?) {
options ||= getDefaultOptions();
/* ... */
}
In JavaScript, all parameters are optional. To fix this syntax error, remove ?
from the parameter:
async function download(uri, options) {
options ||= getDefaultOptions();
/* ... */
}
Introduced in quick-lint-js version 2.10.0.