E0261: TypeScript non-null assertions are not allowed in JavaScript
In TypeScript, ! after a expression is a non-null assertion. It is a syntax
error to write a non-null assertion in JavaScript:
/** @type {string} favoritePowerRanger */
let favoritePowerRanger;
if (player.hasFavoriteColor) {
favoritePowerRanger = player.favoriteColor!;
} else {
favoritePowerRanger = "(unknown)";
}
To fix this error, remove the !:
/** @type {string} favoritePowerRanger */
let favoritePowerRanger;
if (player.hasFavoriteColor) {
favoritePowerRanger = player.favoriteColor;
} else {
favoritePowerRanger = "(unknown)";
}
Introduced in quick-lint-js version 2.7.0.