const element = document.createElement("code");
const container = document.querySelector("div");
const callback = (element: Element) => console.log(element);

Prism.highlightElement(element, false, callback);
Prism.highlightElement(element, false);
Prism.highlightElement(element);
Prism.highlightAll(true, callback);
Prism.highlightAll(true);
Prism.highlightAll();
if (container) {
	Prism.highlightAllUnder(container);
}
Prism.highlightAllUnder(document);

// $ExpectType "Null"
Prism.util.type(null);

// $ExpectType "Undefined"
Prism.util.type(undefined);

// $ExpectType "Boolean"
Prism.util.type(true);

// $ExpectType "Boolean"
Prism.util.type(false);

// $ExpectType "Number"
Prism.util.type(NaN);

// $ExpectType "String"
Prism.util.type("PrismJS");

// $ExpectType "Function"
Prism.util.type(callback);

// $ExpectType "RegExp"
Prism.util.type(/prism/giu);

// $ExpectType "Array"
Prism.util.type([1, 2, 3]);

const hookCallback: Prism.hooks.HookCallback = env => null;
Prism.hooks.add("before-highlightall", hookCallback);
Prism.hooks.add("future-hook", hookCallback);

Prism.hooks.add("before-highlightall", env => {
	env.selector.trim();
});

Prism.hooks.add("complete", env => {
	env.code.trim();
	env.highlightedCode.trim();
});

const language = "js";
// $ExpectType "String"
Prism.util.type(language);

const tokens = Prism.tokenize("var n = 1;", Prism.languages[language]);
(function visit(token: Prism.TokenStream): Prism.TokenStream {
	if (typeof token === "string") {
		return token;
	} else if (Array.isArray(token)) {
		return token.map(visit) as Prism.TokenStream;
	} else {
		token.alias += "visited";
		return token;
	}
})(tokens);

// $ExpectError
if (Prism.util.type(language) === "Null") {
	// `language` is a non-null string constant
}