How to use the @sinonjs/commons.className function in @sinonjs/commons

if (actualObj instanceof RegExp && expectationObj instanceof RegExp) {
            if (valueToString(actualObj) !== valueToString(expectationObj)) {
                return false;
            }
        }

        if (actualObj instanceof Error && expectationObj instanceof Error) {
            return actualObj === expectationObj;
        }

        var actualClass = getClass(actualObj);
        var expectationClass = getClass(expectationObj);
        var actualKeys = keys(actualObj);
        var expectationKeys = keys(expectationObj);
        var actualName = className(actualObj);
        var expectationName = className(expectationObj);
        var expectationSymbols =
            typeof getOwnPropertySymbols === "function"
                ? getOwnPropertySymbols(expectationObj)
                : [];
        var expectationKeysAndSymbols = expectationKeys.concat(
            expectationSymbols
        );

        if (isArguments(actualObj) || isArguments(expectationObj)) {
            if (actualObj.length !== expectationObj.length) {
                return false;
            }
        } else {
            if (
                actualType !== expectationType ||
                actualClass !== expectationClass ||

if (actualObj instanceof RegExp && expectationObj instanceof RegExp) {
            if (valueToString(actualObj) !== valueToString(expectationObj)) {
                return false;
            }
        }

        if (actualObj instanceof Error && expectationObj instanceof Error) {
            return actualObj === expectationObj;
        }

        var actualClass = getClass(actualObj);
        var expectationClass = getClass(expectationObj);
        var actualKeys = keys(actualObj);
        var expectationKeys = keys(expectationObj);
        var actualName = className(actualObj);
        var expectationName = className(expectationObj);
        var expectationSymbols =
            typeof getOwnPropertySymbols === "function"
                ? getOwnPropertySymbols(expectationObj)
                : [];
        var expectationKeysAndSymbols = expectationKeys.concat(
            expectationSymbols
        );

        if (isArguments(actualObj) || isArguments(expectationObj)) {
            if (actualObj.length !== expectationObj.length) {
                return false;
            }
        } else {
            if (
                actualType !== expectationType ||