Function canTailRecurse

test/fixtures/snapshot/typescript.js:62667–62688

(newType, newMapper)

            // type. Note that recursion is possible only through aliased conditional types, so we only increment the tail
            // recursion counter for those.
            function canTailRecurse(newType, newMapper) {
                if (newType.flags & 16777216 /* TypeFlags.Conditional */ && newMapper) {
                    var newRoot = newType.root;
                    if (newRoot.outerTypeParameters) {
                        var typeParamMapper_1 = combineTypeMappers(newType.mapper, newMapper);
                        var typeArguments = ts.map(newRoot.outerTypeParameters, function (t) { return getMappedType(t, typeParamMapper_1); });
                        var newRootMapper = createTypeMapper(newRoot.outerTypeParameters, typeArguments);
                        var newCheckType = newRoot.isDistributive ? getMappedType(newRoot.checkType, newRootMapper) : undefined;
                        if (!newCheckType || newCheckType === newRoot.checkType || !(newCheckType.flags & (1048576 /* TypeFlags.Union */ | 131072 /* TypeFlags.Never */))) {
                            root = newRoot;
                            mapper = newRootMapper;
                            aliasSymbol = undefined;
                            aliasTypeArguments = undefined;
                            if (newRoot.aliasSymbol) {
                                tailCount++;
                            }
                            return true;
                        }
                    }
                }
                return false;
            }
        }
        function getTrueTypeFromConditionalType(type) {
            return type.resolvedTrueType || (type.resolvedTrueType = instantiateType(getTypeFromTypeNode(type.root.node.trueType), type.mapper));