Function instantiateType

test/fixtures/snapshot/typescript.js:63628–63630

(type, mapper)

            return type;
        }
        function instantiateType(type, mapper) {
            return type && mapper ? instantiateTypeWithAlias(type, mapper, /*aliasSymbol*/ undefined, /*aliasTypeArguments*/ undefined) : type;
        }
        function instantiateTypeWithAlias(type, mapper, aliasSymbol, aliasTypeArguments) {
            if (!couldContainTypeVariables(type)) {
                return type;