Function getConditionalTypeInstantiation

test/fixtures/snapshot/typescript.js:63603–63627

(type, mapper, aliasSymbol, aliasTypeArguments)

            return result;
        }
        function getConditionalTypeInstantiation(type, mapper, aliasSymbol, aliasTypeArguments) {
            var root = type.root;
            if (root.outerTypeParameters) {
                // We are instantiating a conditional type that has one or more type parameters in scope. Apply the
                // mapper to the type parameters to produce the effective list of type arguments, and compute the
                // instantiation cache key from the type IDs of the type arguments.
                var typeArguments = ts.map(root.outerTypeParameters, function (t) { return getMappedType(t, mapper); });
                var id = getTypeListId(typeArguments) + getAliasId(aliasSymbol, aliasTypeArguments);
                var result = root.instantiations.get(id);
                if (!result) {
                    var newMapper_1 = createTypeMapper(root.outerTypeParameters, typeArguments);
                    var checkType_1 = root.checkType;
                    var distributionType = root.isDistributive ? getMappedType(checkType_1, newMapper_1) : undefined;
                    // Distributive conditional types are distributed over union types. For example, when the
                    // distributive conditional type T extends U ? X : Y is instantiated with A | B for T, the
                    // result is (A extends U ? X : Y) | (B extends U ? X : Y).
                    result = distributionType && checkType_1 !== distributionType && distributionType.flags & (1048576 /* TypeFlags.Union */ | 131072 /* TypeFlags.Never */) ?
                        mapTypeWithAlias(getReducedType(distributionType), function (t) { return getConditionalType(root, prependTypeMapping(checkType_1, t, newMapper_1)); }, aliasSymbol, aliasTypeArguments) :
                        getConditionalType(root, newMapper_1, aliasSymbol, aliasTypeArguments);
                    root.instantiations.set(id, result);
                }
                return result;
            }
            return type;
        }
        function instantiateType(type, mapper) {
            return type && mapper ? instantiateTypeWithAlias(type, mapper, /*aliasSymbol*/ undefined, /*aliasTypeArguments*/ undefined) : type;
        }