Merge pull request #13604 from Microsoft/intersectionBaseTypes

Allow deriving from object and intersection types
This commit is contained in:
Anders Hejlsberg 2017-01-21 11:38:24 -10:00 committed by GitHub
commit 5b9004e1bc
17 changed files with 1474 additions and 62 deletions

View file

@ -3732,11 +3732,16 @@ namespace ts {
return getObjectFlags(type) & ObjectFlags.Reference ? (<TypeReference>type).target : type;
}
function hasBaseType(type: InterfaceType, checkBase: InterfaceType) {
function hasBaseType(type: BaseType, checkBase: BaseType) {
return check(type);
function check(type: InterfaceType): boolean {
const target = <InterfaceType>getTargetType(type);
return target === checkBase || forEach(getBaseTypes(target), check);
function check(type: BaseType): boolean {
if (getObjectFlags(type) & (ObjectFlags.ClassOrInterface | ObjectFlags.Reference)) {
const target = <InterfaceType>getTargetType(type);
return target === checkBase || forEach(getBaseTypes(target), check);
}
else if (type.flags & TypeFlags.Intersection) {
return forEach((<IntersectionType>type).types, check);
}
}
}
@ -3805,7 +3810,7 @@ namespace ts {
}
function isConstructorType(type: Type): boolean {
return type.flags & TypeFlags.Object && getSignaturesOfType(type, SignatureKind.Construct).length > 0;
return isValidBaseType(type) && getSignaturesOfType(type, SignatureKind.Construct).length > 0;
}
function getBaseTypeNodeOfClass(type: InterfaceType): ExpressionWithTypeArguments {
@ -3844,7 +3849,7 @@ namespace ts {
return unknownType;
}
const baseConstructorType = checkExpression(baseTypeNode.expression);
if (baseConstructorType.flags & TypeFlags.Object) {
if (baseConstructorType.flags & (TypeFlags.Object | TypeFlags.Intersection)) {
// Resolving the members of a class requires us to resolve the base class of that class.
// We force resolution here such that we catch circularities now.
resolveStructuredTypeMembers(<ObjectType>baseConstructorType);
@ -3862,7 +3867,7 @@ namespace ts {
return type.resolvedBaseConstructorType;
}
function getBaseTypes(type: InterfaceType): ObjectType[] {
function getBaseTypes(type: InterfaceType): BaseType[] {
if (!type.resolvedBaseTypes) {
if (type.objectFlags & ObjectFlags.Tuple) {
type.resolvedBaseTypes = [createArrayType(getUnionType(type.typeParameters))];
@ -3885,7 +3890,7 @@ namespace ts {
function resolveBaseTypesOfClass(type: InterfaceType): void {
type.resolvedBaseTypes = type.resolvedBaseTypes || emptyArray;
const baseConstructorType = <ObjectType>getBaseConstructorTypeOfClass(type);
if (!(baseConstructorType.flags & TypeFlags.Object)) {
if (!(baseConstructorType.flags & (TypeFlags.Object | TypeFlags.Intersection))) {
return;
}
const baseTypeNode = getBaseTypeNodeOfClass(type);
@ -3922,11 +3927,11 @@ namespace ts {
if (baseType === unknownType) {
return;
}
if (!(getObjectFlags(getTargetType(baseType)) & ObjectFlags.ClassOrInterface)) {
if (!isValidBaseType(baseType)) {
error(baseTypeNode.expression, Diagnostics.Base_constructor_return_type_0_is_not_a_class_or_interface_type, typeToString(baseType));
return;
}
if (type === baseType || hasBaseType(<InterfaceType>baseType, type)) {
if (type === baseType || hasBaseType(<BaseType>baseType, type)) {
error(valueDecl, Diagnostics.Type_0_recursively_references_itself_as_a_base_type,
typeToString(type, /*enclosingDeclaration*/ undefined, TypeFormatFlags.WriteArrayAsGenericType));
return;
@ -3951,6 +3956,13 @@ namespace ts {
return true;
}
// A valid base type is any non-generic object type or intersection of non-generic
// object types.
function isValidBaseType(type: Type): boolean {
return type.flags & TypeFlags.Object && !isGenericMappedType(type) ||
type.flags & TypeFlags.Intersection && !forEach((<IntersectionType>type).types, t => !isValidBaseType(t));
}
function resolveBaseTypesOfInterface(type: InterfaceType): void {
type.resolvedBaseTypes = type.resolvedBaseTypes || emptyArray;
for (const declaration of type.symbol.declarations) {
@ -3958,8 +3970,8 @@ namespace ts {
for (const node of getInterfaceBaseTypeNodes(<InterfaceDeclaration>declaration)) {
const baseType = getTypeFromTypeNode(node);
if (baseType !== unknownType) {
if (getObjectFlags(getTargetType(baseType)) & ObjectFlags.ClassOrInterface) {
if (type !== baseType && !hasBaseType(<InterfaceType>baseType, type)) {
if (isValidBaseType(baseType)) {
if (type !== baseType && !hasBaseType(<BaseType>baseType, type)) {
if (type.resolvedBaseTypes === emptyArray) {
type.resolvedBaseTypes = [<ObjectType>baseType];
}
@ -4313,8 +4325,14 @@ namespace ts {
function getTypeWithThisArgument(type: Type, thisArgument?: Type): Type {
if (getObjectFlags(type) & ObjectFlags.Reference) {
return createTypeReference((<TypeReference>type).target,
concatenate((<TypeReference>type).typeArguments, [thisArgument || (<TypeReference>type).target.thisType]));
const target = (<TypeReference>type).target;
const typeArguments = (<TypeReference>type).typeArguments;
if (length(target.typeParameters) === length(typeArguments)) {
return createTypeReference(target, concatenate(typeArguments, [thisArgument || target.thisType]));
}
}
else if (type.flags & TypeFlags.Intersection) {
return getIntersectionType(map((<IntersectionType>type).types, t => getTypeWithThisArgument(t, thisArgument)));
}
return type;
}
@ -4349,8 +4367,8 @@ namespace ts {
}
const thisArgument = lastOrUndefined(typeArguments);
for (const baseType of baseTypes) {
const instantiatedBaseType = thisArgument ? getTypeWithThisArgument(<ObjectType>instantiateType(baseType, mapper), thisArgument) : baseType;
addInheritedMembers(members, getPropertiesOfObjectType(instantiatedBaseType));
const instantiatedBaseType = thisArgument ? getTypeWithThisArgument(instantiateType(baseType, mapper), thisArgument) : baseType;
addInheritedMembers(members, getPropertiesOfType(instantiatedBaseType));
callSignatures = concatenate(callSignatures, getSignaturesOfType(instantiatedBaseType, SignatureKind.Call));
constructSignatures = concatenate(constructSignatures, getSignaturesOfType(instantiatedBaseType, SignatureKind.Construct));
stringIndexInfo = stringIndexInfo || getIndexInfoOfType(instantiatedBaseType, IndexKind.String);
@ -4572,9 +4590,9 @@ namespace ts {
constructSignatures = getDefaultConstructSignatures(classType);
}
const baseConstructorType = getBaseConstructorTypeOfClass(classType);
if (baseConstructorType.flags & TypeFlags.Object) {
if (baseConstructorType.flags & (TypeFlags.Object | TypeFlags.Intersection)) {
members = createSymbolTable(getNamedMembers(members));
addInheritedMembers(members, getPropertiesOfObjectType(baseConstructorType));
addInheritedMembers(members, getPropertiesOfType(baseConstructorType));
}
}
const numberIndexInfo = symbol.flags & SymbolFlags.Enum ? enumNumberIndexInfo : undefined;
@ -4738,28 +4756,26 @@ namespace ts {
}
function getPropertiesOfUnionOrIntersectionType(type: UnionOrIntersectionType): Symbol[] {
for (const current of type.types) {
for (const prop of getPropertiesOfType(current)) {
getUnionOrIntersectionProperty(type, prop.name);
}
// The properties of a union type are those that are present in all constituent types, so
// we only need to check the properties of the first type
if (type.flags & TypeFlags.Union) {
break;
}
}
const props = type.resolvedProperties;
if (props) {
const result: Symbol[] = [];
props.forEach(prop => {
// We need to filter out partial properties in union types
if (!(prop.flags & SymbolFlags.SyntheticProperty && (<TransientSymbol>prop).isPartial)) {
result.push(prop);
if (!type.resolvedProperties) {
const members = createMap<Symbol>();
for (const current of type.types) {
for (const prop of getPropertiesOfType(current)) {
if (!members.has(prop.name)) {
const combinedProp = getPropertyOfUnionOrIntersectionType(type, prop.name);
if (combinedProp) {
members.set(prop.name, combinedProp);
}
}
}
});
return result;
// The properties of a union type are those that are present in all constituent types, so
// we only need to check the properties of the first type
if (type.flags & TypeFlags.Union) {
break;
}
}
type.resolvedProperties = getNamedMembers(members);
}
return emptyArray;
return type.resolvedProperties;
}
function getPropertiesOfType(type: Type): Symbol[] {
@ -4844,6 +4860,10 @@ namespace ts {
}
}
function getApparentTypeOfIntersectionType(type: IntersectionType) {
return type.resolvedIndexType || (type.resolvedApparentType = getTypeWithThisArgument(type, type));
}
/**
* For a type parameter, return the base constraint of the type parameter. For the string, number,
* boolean, and symbol primitive types, return the corresponding object types. Otherwise return the
@ -4851,7 +4871,8 @@ namespace ts {
*/
function getApparentType(type: Type): Type {
const t = type.flags & TypeFlags.TypeVariable ? getBaseConstraintOfType(<TypeVariable>type) || emptyObjectType : type;
return t.flags & TypeFlags.StringLike ? globalStringType :
return t.flags & TypeFlags.Intersection ? getApparentTypeOfIntersectionType(<IntersectionType>type) :
t.flags & TypeFlags.StringLike ? globalStringType :
t.flags & TypeFlags.NumberLike ? globalNumberType :
t.flags & TypeFlags.BooleanLike ? globalBooleanType :
t.flags & TypeFlags.ESSymbol ? getGlobalESSymbolType() :
@ -4927,7 +4948,7 @@ namespace ts {
// these partial properties when identifying discriminant properties, but otherwise they are filtered out
// and do not appear to be present in the union type.
function getUnionOrIntersectionProperty(type: UnionOrIntersectionType, name: string): Symbol {
const properties = type.resolvedProperties || (type.resolvedProperties = createMap<Symbol>());
const properties = type.propertyCache || (type.propertyCache = createMap<Symbol>());
let property = properties.get(name);
if (!property) {
property = createUnionOrIntersectionProperty(type, name);
@ -18215,16 +18236,18 @@ namespace ts {
return;
}
const propDeclaration = prop.valueDeclaration;
// index is numeric and property name is not valid numeric literal
if (indexKind === IndexKind.Number && !isNumericName(prop.valueDeclaration.name)) {
if (indexKind === IndexKind.Number && !(propDeclaration ? isNumericName(propDeclaration.name) : isNumericLiteralName(prop.name))) {
return;
}
// perform property check if property or indexer is declared in 'type'
// this allows to rule out cases when both property and indexer are inherited from the base class
let errorNode: Node;
if (prop.valueDeclaration.name.kind === SyntaxKind.ComputedPropertyName || prop.parent === containingType.symbol) {
errorNode = prop.valueDeclaration;
if (propDeclaration && (propDeclaration.name.kind === SyntaxKind.ComputedPropertyName || prop.parent === containingType.symbol)) {
errorNode = propDeclaration;
}
else if (indexDeclaration) {
errorNode = indexDeclaration;
@ -18367,7 +18390,7 @@ namespace ts {
checkTypeAssignableTo(staticType, getTypeWithoutSignatures(staticBaseType), node.name || node,
Diagnostics.Class_static_side_0_incorrectly_extends_base_class_static_side_1);
if (baseType.symbol.valueDeclaration &&
if (baseType.symbol && baseType.symbol.valueDeclaration &&
!isInAmbientContext(baseType.symbol.valueDeclaration) &&
baseType.symbol.valueDeclaration.kind === SyntaxKind.ClassDeclaration) {
if (!isBlockScopedNameDeclaredBeforeUse(baseType.symbol.valueDeclaration, node)) {
@ -18399,8 +18422,7 @@ namespace ts {
if (produceDiagnostics) {
const t = getTypeFromTypeNode(typeRefNode);
if (t !== unknownType) {
const declaredType = getObjectFlags(t) & ObjectFlags.Reference ? (<TypeReference>t).target : t;
if (getObjectFlags(declaredType) & ObjectFlags.ClassOrInterface) {
if (isValidBaseType(t)) {
checkTypeAssignableTo(typeWithThis, getTypeWithThisArgument(t, type.thisType), node.name || node, Diagnostics.Class_0_incorrectly_implements_interface_1);
}
else {
@ -18440,7 +18462,7 @@ namespace ts {
return forEach(symbol.declarations, d => isClassLike(d) ? d : undefined);
}
function checkKindsOfPropertyMemberOverrides(type: InterfaceType, baseType: ObjectType): void {
function checkKindsOfPropertyMemberOverrides(type: InterfaceType, baseType: BaseType): void {
// TypeScript 1.0 spec (April 2014): 8.2.3
// A derived class inherits all members from its base class it doesn't override.
@ -18457,7 +18479,7 @@ namespace ts {
// derived class instance member variables and accessors, but not by other kinds of members.
// NOTE: assignability is checked in checkClassDeclaration
const baseProperties = getPropertiesOfObjectType(baseType);
const baseProperties = getPropertiesOfType(baseType);
for (const baseProperty of baseProperties) {
const base = getTargetSymbol(baseProperty);
@ -18581,7 +18603,7 @@ namespace ts {
let ok = true;
for (const base of baseTypes) {
const properties = getPropertiesOfObjectType(getTypeWithThisArgument(base, type.thisType));
const properties = getPropertiesOfType(getTypeWithThisArgument(base, type.thisType));
for (const prop of properties) {
const existing = seen.get(prop.name);
if (!existing) {

View file

@ -204,6 +204,10 @@ namespace ts {
GreaterThan = 1
}
export function length(array: any[]) {
return array ? array.length : 0;
}
/**
* Iterates through 'array' by index and performs the callback on each element of array until the callback
* returns a truthy value, then returns that value.

View file

@ -2358,7 +2358,7 @@
getIndexInfoOfType(type: Type, kind: IndexKind): IndexInfo;
getSignaturesOfType(type: Type, kind: SignatureKind): Signature[];
getIndexTypeOfType(type: Type, kind: IndexKind): Type;
getBaseTypes(type: InterfaceType): ObjectType[];
getBaseTypes(type: InterfaceType): BaseType[];
getReturnTypeOfSignature(signature: Signature): Type;
/**
* Gets the type of a parameter at a given position in a signature.
@ -2910,9 +2910,12 @@
/* @internal */
resolvedBaseConstructorType?: Type; // Resolved base constructor type of class
/* @internal */
resolvedBaseTypes: ObjectType[]; // Resolved base types
resolvedBaseTypes: BaseType[]; // Resolved base types
}
// Object type or intersection of object types
export type BaseType = ObjectType | IntersectionType;
export interface InterfaceTypeWithDeclaredMembers extends InterfaceType {
declaredProperties: Symbol[]; // Declared members
declaredCallSignatures: Signature[]; // Declared call signatures
@ -2945,7 +2948,9 @@
export interface UnionOrIntersectionType extends Type {
types: Type[]; // Constituent types
/* @internal */
resolvedProperties: SymbolTable; // Cache of resolved properties
propertyCache: SymbolTable; // Cache of resolved properties
/* @internal */
resolvedProperties: Symbol[];
/* @internal */
resolvedIndexType: IndexType;
/* @internal */
@ -2956,7 +2961,10 @@
export interface UnionType extends UnionOrIntersectionType { }
export interface IntersectionType extends UnionOrIntersectionType { }
export interface IntersectionType extends UnionOrIntersectionType {
/* @internal */
resolvedApparentType: Type;
}
export type StructuredType = ObjectType | UnionType | IntersectionType;

View file

@ -382,7 +382,7 @@ namespace ts {
getNumberIndexType(): Type {
return this.checker.getIndexTypeOfType(this, IndexKind.Number);
}
getBaseTypes(): ObjectType[] {
getBaseTypes(): BaseType[] {
return this.flags & TypeFlags.Object && this.objectFlags & (ObjectFlags.Class | ObjectFlags.Interface)
? this.checker.getBaseTypes(<InterfaceType><Type>this)
: undefined;

View file

@ -33,7 +33,7 @@ namespace ts {
getConstructSignatures(): Signature[];
getStringIndexType(): Type;
getNumberIndexType(): Type;
getBaseTypes(): ObjectType[];
getBaseTypes(): BaseType[];
getNonNullableType(): Type;
}

View file

@ -0,0 +1,145 @@
//// [interfaceExtendsObjectIntersection.ts]
type T1 = { a: number };
type T2 = T1 & { b: number };
type T3 = () => void;
type T4 = new () => { a: number };
type T5 = number[];
type T6 = [string, number];
type T7 = { [P in 'a' | 'b' | 'c']: string };
interface I1 extends T1 { x: string }
interface I2 extends T2 { x: string }
interface I3 extends T3 { x: string }
interface I4 extends T4 { x: string }
interface I5 extends T5 { x: string }
interface I6 extends T6 { x: string }
interface I7 extends T7 { x: string }
type Constructor<T> = new () => T;
declare function Constructor<T>(): Constructor<T>;
class C1 extends Constructor<I1>() { x: string }
class C2 extends Constructor<I2>() { x: string }
class C3 extends Constructor<I3>() { x: string }
class C4 extends Constructor<I4>() { x: string }
class C5 extends Constructor<I5>() { x: string }
class C6 extends Constructor<I6>() { x: string }
class C7 extends Constructor<I7>() { x: string }
declare function fx(x: string): string;
declare class CX { a: number }
declare enum EX { A, B, C }
declare namespace NX { export const a = 1 }
type T10 = typeof fx;
type T11 = typeof CX;
type T12 = typeof EX;
type T13 = typeof NX;
interface I10 extends T10 { x: string }
interface I11 extends T11 { x: string }
interface I12 extends T12 { x: string }
interface I13 extends T13 { x: string }
type Identifiable<T> = { _id: string } & T;
interface I20 extends Partial<T1> { x: string }
interface I21 extends Readonly<T1> { x: string }
interface I22 extends Identifiable<T1> { x: string }
interface I23 extends Identifiable<T1 & { b: number}> { x: string }
class C20 extends Constructor<Partial<T1>>() { x: string }
class C21 extends Constructor<Readonly<T1>>() { x: string }
class C22 extends Constructor<Identifiable<T1>>() { x: string }
class C23 extends Constructor<Identifiable<T1 & { b: number}>>() { x: string }
//// [interfaceExtendsObjectIntersection.js]
var __extends = (this && this.__extends) || (function () {
var extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var C1 = (function (_super) {
__extends(C1, _super);
function C1() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C1;
}(Constructor()));
var C2 = (function (_super) {
__extends(C2, _super);
function C2() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C2;
}(Constructor()));
var C3 = (function (_super) {
__extends(C3, _super);
function C3() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C3;
}(Constructor()));
var C4 = (function (_super) {
__extends(C4, _super);
function C4() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C4;
}(Constructor()));
var C5 = (function (_super) {
__extends(C5, _super);
function C5() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C5;
}(Constructor()));
var C6 = (function (_super) {
__extends(C6, _super);
function C6() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C6;
}(Constructor()));
var C7 = (function (_super) {
__extends(C7, _super);
function C7() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C7;
}(Constructor()));
var C20 = (function (_super) {
__extends(C20, _super);
function C20() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C20;
}(Constructor()));
var C21 = (function (_super) {
__extends(C21, _super);
function C21() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C21;
}(Constructor()));
var C22 = (function (_super) {
__extends(C22, _super);
function C22() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C22;
}(Constructor()));
var C23 = (function (_super) {
__extends(C23, _super);
function C23() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C23;
}(Constructor()));

View file

@ -0,0 +1,230 @@
=== tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection.ts ===
type T1 = { a: number };
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>a : Symbol(a, Decl(interfaceExtendsObjectIntersection.ts, 1, 11))
type T2 = T1 & { b: number };
>T2 : Symbol(T2, Decl(interfaceExtendsObjectIntersection.ts, 1, 24))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>b : Symbol(b, Decl(interfaceExtendsObjectIntersection.ts, 2, 16))
type T3 = () => void;
>T3 : Symbol(T3, Decl(interfaceExtendsObjectIntersection.ts, 2, 29))
type T4 = new () => { a: number };
>T4 : Symbol(T4, Decl(interfaceExtendsObjectIntersection.ts, 3, 21))
>a : Symbol(a, Decl(interfaceExtendsObjectIntersection.ts, 4, 21))
type T5 = number[];
>T5 : Symbol(T5, Decl(interfaceExtendsObjectIntersection.ts, 4, 34))
type T6 = [string, number];
>T6 : Symbol(T6, Decl(interfaceExtendsObjectIntersection.ts, 5, 19))
type T7 = { [P in 'a' | 'b' | 'c']: string };
>T7 : Symbol(T7, Decl(interfaceExtendsObjectIntersection.ts, 6, 27))
>P : Symbol(P, Decl(interfaceExtendsObjectIntersection.ts, 7, 13))
interface I1 extends T1 { x: string }
>I1 : Symbol(I1, Decl(interfaceExtendsObjectIntersection.ts, 7, 45))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(I1.x, Decl(interfaceExtendsObjectIntersection.ts, 9, 25))
interface I2 extends T2 { x: string }
>I2 : Symbol(I2, Decl(interfaceExtendsObjectIntersection.ts, 9, 37))
>T2 : Symbol(T2, Decl(interfaceExtendsObjectIntersection.ts, 1, 24))
>x : Symbol(I2.x, Decl(interfaceExtendsObjectIntersection.ts, 10, 25))
interface I3 extends T3 { x: string }
>I3 : Symbol(I3, Decl(interfaceExtendsObjectIntersection.ts, 10, 37))
>T3 : Symbol(T3, Decl(interfaceExtendsObjectIntersection.ts, 2, 29))
>x : Symbol(I3.x, Decl(interfaceExtendsObjectIntersection.ts, 11, 25))
interface I4 extends T4 { x: string }
>I4 : Symbol(I4, Decl(interfaceExtendsObjectIntersection.ts, 11, 37))
>T4 : Symbol(T4, Decl(interfaceExtendsObjectIntersection.ts, 3, 21))
>x : Symbol(I4.x, Decl(interfaceExtendsObjectIntersection.ts, 12, 25))
interface I5 extends T5 { x: string }
>I5 : Symbol(I5, Decl(interfaceExtendsObjectIntersection.ts, 12, 37))
>T5 : Symbol(T5, Decl(interfaceExtendsObjectIntersection.ts, 4, 34))
>x : Symbol(I5.x, Decl(interfaceExtendsObjectIntersection.ts, 13, 25))
interface I6 extends T6 { x: string }
>I6 : Symbol(I6, Decl(interfaceExtendsObjectIntersection.ts, 13, 37))
>T6 : Symbol(T6, Decl(interfaceExtendsObjectIntersection.ts, 5, 19))
>x : Symbol(I6.x, Decl(interfaceExtendsObjectIntersection.ts, 14, 25))
interface I7 extends T7 { x: string }
>I7 : Symbol(I7, Decl(interfaceExtendsObjectIntersection.ts, 14, 37))
>T7 : Symbol(T7, Decl(interfaceExtendsObjectIntersection.ts, 6, 27))
>x : Symbol(I7.x, Decl(interfaceExtendsObjectIntersection.ts, 15, 25))
type Constructor<T> = new () => T;
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 17, 17))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 17, 17))
declare function Constructor<T>(): Constructor<T>;
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 18, 29))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 18, 29))
class C1 extends Constructor<I1>() { x: string }
>C1 : Symbol(C1, Decl(interfaceExtendsObjectIntersection.ts, 18, 50))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I1 : Symbol(I1, Decl(interfaceExtendsObjectIntersection.ts, 7, 45))
>x : Symbol(C1.x, Decl(interfaceExtendsObjectIntersection.ts, 20, 36))
class C2 extends Constructor<I2>() { x: string }
>C2 : Symbol(C2, Decl(interfaceExtendsObjectIntersection.ts, 20, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I2 : Symbol(I2, Decl(interfaceExtendsObjectIntersection.ts, 9, 37))
>x : Symbol(C2.x, Decl(interfaceExtendsObjectIntersection.ts, 21, 36))
class C3 extends Constructor<I3>() { x: string }
>C3 : Symbol(C3, Decl(interfaceExtendsObjectIntersection.ts, 21, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I3 : Symbol(I3, Decl(interfaceExtendsObjectIntersection.ts, 10, 37))
>x : Symbol(C3.x, Decl(interfaceExtendsObjectIntersection.ts, 22, 36))
class C4 extends Constructor<I4>() { x: string }
>C4 : Symbol(C4, Decl(interfaceExtendsObjectIntersection.ts, 22, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I4 : Symbol(I4, Decl(interfaceExtendsObjectIntersection.ts, 11, 37))
>x : Symbol(C4.x, Decl(interfaceExtendsObjectIntersection.ts, 23, 36))
class C5 extends Constructor<I5>() { x: string }
>C5 : Symbol(C5, Decl(interfaceExtendsObjectIntersection.ts, 23, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I5 : Symbol(I5, Decl(interfaceExtendsObjectIntersection.ts, 12, 37))
>x : Symbol(C5.x, Decl(interfaceExtendsObjectIntersection.ts, 24, 36))
class C6 extends Constructor<I6>() { x: string }
>C6 : Symbol(C6, Decl(interfaceExtendsObjectIntersection.ts, 24, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I6 : Symbol(I6, Decl(interfaceExtendsObjectIntersection.ts, 13, 37))
>x : Symbol(C6.x, Decl(interfaceExtendsObjectIntersection.ts, 25, 36))
class C7 extends Constructor<I7>() { x: string }
>C7 : Symbol(C7, Decl(interfaceExtendsObjectIntersection.ts, 25, 48))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>I7 : Symbol(I7, Decl(interfaceExtendsObjectIntersection.ts, 14, 37))
>x : Symbol(C7.x, Decl(interfaceExtendsObjectIntersection.ts, 26, 36))
declare function fx(x: string): string;
>fx : Symbol(fx, Decl(interfaceExtendsObjectIntersection.ts, 26, 48))
>x : Symbol(x, Decl(interfaceExtendsObjectIntersection.ts, 28, 20))
declare class CX { a: number }
>CX : Symbol(CX, Decl(interfaceExtendsObjectIntersection.ts, 28, 39))
>a : Symbol(CX.a, Decl(interfaceExtendsObjectIntersection.ts, 29, 18))
declare enum EX { A, B, C }
>EX : Symbol(EX, Decl(interfaceExtendsObjectIntersection.ts, 29, 30))
>A : Symbol(EX.A, Decl(interfaceExtendsObjectIntersection.ts, 30, 17))
>B : Symbol(EX.B, Decl(interfaceExtendsObjectIntersection.ts, 30, 20))
>C : Symbol(EX.C, Decl(interfaceExtendsObjectIntersection.ts, 30, 23))
declare namespace NX { export const a = 1 }
>NX : Symbol(NX, Decl(interfaceExtendsObjectIntersection.ts, 30, 27))
>a : Symbol(a, Decl(interfaceExtendsObjectIntersection.ts, 31, 35))
type T10 = typeof fx;
>T10 : Symbol(T10, Decl(interfaceExtendsObjectIntersection.ts, 31, 43))
>fx : Symbol(fx, Decl(interfaceExtendsObjectIntersection.ts, 26, 48))
type T11 = typeof CX;
>T11 : Symbol(T11, Decl(interfaceExtendsObjectIntersection.ts, 33, 21))
>CX : Symbol(CX, Decl(interfaceExtendsObjectIntersection.ts, 28, 39))
type T12 = typeof EX;
>T12 : Symbol(T12, Decl(interfaceExtendsObjectIntersection.ts, 34, 21))
>EX : Symbol(EX, Decl(interfaceExtendsObjectIntersection.ts, 29, 30))
type T13 = typeof NX;
>T13 : Symbol(T13, Decl(interfaceExtendsObjectIntersection.ts, 35, 21))
>NX : Symbol(NX, Decl(interfaceExtendsObjectIntersection.ts, 30, 27))
interface I10 extends T10 { x: string }
>I10 : Symbol(I10, Decl(interfaceExtendsObjectIntersection.ts, 36, 21))
>T10 : Symbol(T10, Decl(interfaceExtendsObjectIntersection.ts, 31, 43))
>x : Symbol(I10.x, Decl(interfaceExtendsObjectIntersection.ts, 38, 27))
interface I11 extends T11 { x: string }
>I11 : Symbol(I11, Decl(interfaceExtendsObjectIntersection.ts, 38, 39))
>T11 : Symbol(T11, Decl(interfaceExtendsObjectIntersection.ts, 33, 21))
>x : Symbol(I11.x, Decl(interfaceExtendsObjectIntersection.ts, 39, 27))
interface I12 extends T12 { x: string }
>I12 : Symbol(I12, Decl(interfaceExtendsObjectIntersection.ts, 39, 39))
>T12 : Symbol(T12, Decl(interfaceExtendsObjectIntersection.ts, 34, 21))
>x : Symbol(I12.x, Decl(interfaceExtendsObjectIntersection.ts, 40, 27))
interface I13 extends T13 { x: string }
>I13 : Symbol(I13, Decl(interfaceExtendsObjectIntersection.ts, 40, 39))
>T13 : Symbol(T13, Decl(interfaceExtendsObjectIntersection.ts, 35, 21))
>x : Symbol(I13.x, Decl(interfaceExtendsObjectIntersection.ts, 41, 27))
type Identifiable<T> = { _id: string } & T;
>Identifiable : Symbol(Identifiable, Decl(interfaceExtendsObjectIntersection.ts, 41, 39))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 43, 18))
>_id : Symbol(_id, Decl(interfaceExtendsObjectIntersection.ts, 43, 24))
>T : Symbol(T, Decl(interfaceExtendsObjectIntersection.ts, 43, 18))
interface I20 extends Partial<T1> { x: string }
>I20 : Symbol(I20, Decl(interfaceExtendsObjectIntersection.ts, 43, 43))
>Partial : Symbol(Partial, Decl(lib.d.ts, --, --))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(I20.x, Decl(interfaceExtendsObjectIntersection.ts, 45, 35))
interface I21 extends Readonly<T1> { x: string }
>I21 : Symbol(I21, Decl(interfaceExtendsObjectIntersection.ts, 45, 47))
>Readonly : Symbol(Readonly, Decl(lib.d.ts, --, --))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(I21.x, Decl(interfaceExtendsObjectIntersection.ts, 46, 36))
interface I22 extends Identifiable<T1> { x: string }
>I22 : Symbol(I22, Decl(interfaceExtendsObjectIntersection.ts, 46, 48))
>Identifiable : Symbol(Identifiable, Decl(interfaceExtendsObjectIntersection.ts, 41, 39))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(I22.x, Decl(interfaceExtendsObjectIntersection.ts, 47, 40))
interface I23 extends Identifiable<T1 & { b: number}> { x: string }
>I23 : Symbol(I23, Decl(interfaceExtendsObjectIntersection.ts, 47, 52))
>Identifiable : Symbol(Identifiable, Decl(interfaceExtendsObjectIntersection.ts, 41, 39))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>b : Symbol(b, Decl(interfaceExtendsObjectIntersection.ts, 48, 41))
>x : Symbol(I23.x, Decl(interfaceExtendsObjectIntersection.ts, 48, 55))
class C20 extends Constructor<Partial<T1>>() { x: string }
>C20 : Symbol(C20, Decl(interfaceExtendsObjectIntersection.ts, 48, 67))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>Partial : Symbol(Partial, Decl(lib.d.ts, --, --))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(C20.x, Decl(interfaceExtendsObjectIntersection.ts, 50, 46))
class C21 extends Constructor<Readonly<T1>>() { x: string }
>C21 : Symbol(C21, Decl(interfaceExtendsObjectIntersection.ts, 50, 58))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>Readonly : Symbol(Readonly, Decl(lib.d.ts, --, --))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(C21.x, Decl(interfaceExtendsObjectIntersection.ts, 51, 47))
class C22 extends Constructor<Identifiable<T1>>() { x: string }
>C22 : Symbol(C22, Decl(interfaceExtendsObjectIntersection.ts, 51, 59))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>Identifiable : Symbol(Identifiable, Decl(interfaceExtendsObjectIntersection.ts, 41, 39))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>x : Symbol(C22.x, Decl(interfaceExtendsObjectIntersection.ts, 52, 51))
class C23 extends Constructor<Identifiable<T1 & { b: number}>>() { x: string }
>C23 : Symbol(C23, Decl(interfaceExtendsObjectIntersection.ts, 52, 63))
>Constructor : Symbol(Constructor, Decl(interfaceExtendsObjectIntersection.ts, 15, 37), Decl(interfaceExtendsObjectIntersection.ts, 17, 34))
>Identifiable : Symbol(Identifiable, Decl(interfaceExtendsObjectIntersection.ts, 41, 39))
>T1 : Symbol(T1, Decl(interfaceExtendsObjectIntersection.ts, 0, 0))
>b : Symbol(b, Decl(interfaceExtendsObjectIntersection.ts, 53, 49))
>x : Symbol(C23.x, Decl(interfaceExtendsObjectIntersection.ts, 53, 66))

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@ -0,0 +1,242 @@
=== tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersection.ts ===
type T1 = { a: number };
>T1 : T1
>a : number
type T2 = T1 & { b: number };
>T2 : T2
>T1 : T1
>b : number
type T3 = () => void;
>T3 : T3
type T4 = new () => { a: number };
>T4 : T4
>a : number
type T5 = number[];
>T5 : number[]
type T6 = [string, number];
>T6 : [string, number]
type T7 = { [P in 'a' | 'b' | 'c']: string };
>T7 : T7
>P : P
interface I1 extends T1 { x: string }
>I1 : I1
>T1 : T1
>x : string
interface I2 extends T2 { x: string }
>I2 : I2
>T2 : T2
>x : string
interface I3 extends T3 { x: string }
>I3 : I3
>T3 : T3
>x : string
interface I4 extends T4 { x: string }
>I4 : I4
>T4 : T4
>x : string
interface I5 extends T5 { x: string }
>I5 : I5
>T5 : number[]
>x : string
interface I6 extends T6 { x: string }
>I6 : I6
>T6 : [string, number]
>x : string
interface I7 extends T7 { x: string }
>I7 : I7
>T7 : T7
>x : string
type Constructor<T> = new () => T;
>Constructor : Constructor<T>
>T : T
>T : T
declare function Constructor<T>(): Constructor<T>;
>Constructor : <T>() => Constructor<T>
>T : T
>Constructor : Constructor<T>
>T : T
class C1 extends Constructor<I1>() { x: string }
>C1 : C1
>Constructor<I1>() : I1
>Constructor : <T>() => Constructor<T>
>I1 : I1
>x : string
class C2 extends Constructor<I2>() { x: string }
>C2 : C2
>Constructor<I2>() : I2
>Constructor : <T>() => Constructor<T>
>I2 : I2
>x : string
class C3 extends Constructor<I3>() { x: string }
>C3 : C3
>Constructor<I3>() : I3
>Constructor : <T>() => Constructor<T>
>I3 : I3
>x : string
class C4 extends Constructor<I4>() { x: string }
>C4 : C4
>Constructor<I4>() : I4
>Constructor : <T>() => Constructor<T>
>I4 : I4
>x : string
class C5 extends Constructor<I5>() { x: string }
>C5 : C5
>Constructor<I5>() : I5
>Constructor : <T>() => Constructor<T>
>I5 : I5
>x : string
class C6 extends Constructor<I6>() { x: string }
>C6 : C6
>Constructor<I6>() : I6
>Constructor : <T>() => Constructor<T>
>I6 : I6
>x : string
class C7 extends Constructor<I7>() { x: string }
>C7 : C7
>Constructor<I7>() : I7
>Constructor : <T>() => Constructor<T>
>I7 : I7
>x : string
declare function fx(x: string): string;
>fx : (x: string) => string
>x : string
declare class CX { a: number }
>CX : CX
>a : number
declare enum EX { A, B, C }
>EX : EX
>A : EX
>B : EX
>C : EX
declare namespace NX { export const a = 1 }
>NX : typeof NX
>a : 1
>1 : 1
type T10 = typeof fx;
>T10 : (x: string) => string
>fx : (x: string) => string
type T11 = typeof CX;
>T11 : typeof CX
>CX : typeof CX
type T12 = typeof EX;
>T12 : typeof EX
>EX : typeof EX
type T13 = typeof NX;
>T13 : typeof NX
>NX : typeof NX
interface I10 extends T10 { x: string }
>I10 : I10
>T10 : (x: string) => string
>x : string
interface I11 extends T11 { x: string }
>I11 : I11
>T11 : typeof CX
>x : string
interface I12 extends T12 { x: string }
>I12 : I12
>T12 : typeof EX
>x : string
interface I13 extends T13 { x: string }
>I13 : I13
>T13 : typeof NX
>x : string
type Identifiable<T> = { _id: string } & T;
>Identifiable : Identifiable<T>
>T : T
>_id : string
>T : T
interface I20 extends Partial<T1> { x: string }
>I20 : I20
>Partial : Partial<T>
>T1 : T1
>x : string
interface I21 extends Readonly<T1> { x: string }
>I21 : I21
>Readonly : Readonly<T>
>T1 : T1
>x : string
interface I22 extends Identifiable<T1> { x: string }
>I22 : I22
>Identifiable : Identifiable<T>
>T1 : T1
>x : string
interface I23 extends Identifiable<T1 & { b: number}> { x: string }
>I23 : I23
>Identifiable : Identifiable<T>
>T1 : T1
>b : number
>x : string
class C20 extends Constructor<Partial<T1>>() { x: string }
>C20 : C20
>Constructor<Partial<T1>>() : Partial<T1>
>Constructor : <T>() => Constructor<T>
>Partial : Partial<T>
>T1 : T1
>x : string
class C21 extends Constructor<Readonly<T1>>() { x: string }
>C21 : C21
>Constructor<Readonly<T1>>() : Readonly<T1>
>Constructor : <T>() => Constructor<T>
>Readonly : Readonly<T>
>T1 : T1
>x : string
class C22 extends Constructor<Identifiable<T1>>() { x: string }
>C22 : C22
>Constructor<Identifiable<T1>>() : Identifiable<T1>
>Constructor : <T>() => Constructor<T>
>Identifiable : Identifiable<T>
>T1 : T1
>x : string
class C23 extends Constructor<Identifiable<T1 & { b: number}>>() { x: string }
>C23 : C23
>Constructor<Identifiable<T1 & { b: number}>>() : Identifiable<T1 & { b: number; }>
>Constructor : <T>() => Constructor<T>
>Identifiable : Identifiable<T>
>T1 : T1
>b : number
>x : string

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@ -0,0 +1,197 @@
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(8,11): error TS2430: Interface 'I1' incorrectly extends interface 'T1'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(9,11): error TS2430: Interface 'I2' incorrectly extends interface 'T2'.
Type 'I2' is not assignable to type '{ b: number; }'.
Types of property 'b' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(10,11): error TS2430: Interface 'I3' incorrectly extends interface 'number[]'.
Types of property 'length' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(11,11): error TS2430: Interface 'I4' incorrectly extends interface '[string, number]'.
Types of property '0' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(12,11): error TS2430: Interface 'I5' incorrectly extends interface 'T5'.
Types of property 'c' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(17,7): error TS2415: Class 'C1' incorrectly extends base class 'T1'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(18,7): error TS2415: Class 'C2' incorrectly extends base class 'T2'.
Type 'C2' is not assignable to type '{ b: number; }'.
Types of property 'b' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(19,7): error TS2415: Class 'C3' incorrectly extends base class 'number[]'.
Types of property 'length' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(20,7): error TS2415: Class 'C4' incorrectly extends base class '[string, number]'.
Types of property '0' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(21,7): error TS2415: Class 'C5' incorrectly extends base class 'T5'.
Types of property 'c' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(31,11): error TS2430: Interface 'I10' incorrectly extends interface 'typeof CX'.
Types of property 'a' are incompatible.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(32,11): error TS2430: Interface 'I11' incorrectly extends interface 'typeof EX'.
Types of property 'C' are incompatible.
Type 'string' is not assignable to type 'EX'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(33,11): error TS2430: Interface 'I12' incorrectly extends interface 'typeof NX'.
Types of property 'a' are incompatible.
Type 'number' is not assignable to type '"hello"'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(34,29): error TS2411: Property 'a' of type 'string' is not assignable to string index type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(34,29): error TS2411: Property 'prototype' of type 'CX' is not assignable to string index type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(35,29): error TS2413: Numeric index type 'string' is not assignable to string index type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(36,29): error TS2411: Property 'a' of type '"hello"' is not assignable to string index type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(40,11): error TS2430: Interface 'I20' incorrectly extends interface 'Partial<T1>'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number | undefined'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(41,11): error TS2430: Interface 'I21' incorrectly extends interface 'Readonly<T1>'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(42,11): error TS2430: Interface 'I22' incorrectly extends interface 'Identifiable<T1>'.
Type 'I22' is not assignable to type 'T1'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(43,11): error TS2430: Interface 'I23' incorrectly extends interface 'Identifiable<T1 & { b: number; }>'.
Type 'I23' is not assignable to type 'T1'.
Types of property 'a' are incompatible.
Type 'string' is not assignable to type 'number'.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(47,23): error TS2312: An interface may only extend a class or another interface.
tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts(48,26): error TS2312: An interface may only extend a class or another interface.
==== tests/cases/conformance/interfaces/interfaceDeclarations/interfaceExtendsObjectIntersectionErrors.ts (23 errors) ====
type T1 = { a: number };
type T2 = T1 & { b: number };
type T3 = number[];
type T4 = [string, number];
type T5 = { [P in 'a' | 'b' | 'c']: string };
interface I1 extends T1 { a: string }
~~
!!! error TS2430: Interface 'I1' incorrectly extends interface 'T1'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
interface I2 extends T2 { b: string }
~~
!!! error TS2430: Interface 'I2' incorrectly extends interface 'T2'.
!!! error TS2430: Type 'I2' is not assignable to type '{ b: number; }'.
!!! error TS2430: Types of property 'b' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
interface I3 extends T3 { length: string }
~~
!!! error TS2430: Interface 'I3' incorrectly extends interface 'number[]'.
!!! error TS2430: Types of property 'length' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
interface I4 extends T4 { 0: number }
~~
!!! error TS2430: Interface 'I4' incorrectly extends interface '[string, number]'.
!!! error TS2430: Types of property '0' are incompatible.
!!! error TS2430: Type 'number' is not assignable to type 'string'.
interface I5 extends T5 { c: number }
~~
!!! error TS2430: Interface 'I5' incorrectly extends interface 'T5'.
!!! error TS2430: Types of property 'c' are incompatible.
!!! error TS2430: Type 'number' is not assignable to type 'string'.
type Constructor<T> = new () => T;
declare function Constructor<T>(): Constructor<T>;
class C1 extends Constructor<T1>() { a: string }
~~
!!! error TS2415: Class 'C1' incorrectly extends base class 'T1'.
!!! error TS2415: Types of property 'a' are incompatible.
!!! error TS2415: Type 'string' is not assignable to type 'number'.
class C2 extends Constructor<T2>() { b: string }
~~
!!! error TS2415: Class 'C2' incorrectly extends base class 'T2'.
!!! error TS2415: Type 'C2' is not assignable to type '{ b: number; }'.
!!! error TS2415: Types of property 'b' are incompatible.
!!! error TS2415: Type 'string' is not assignable to type 'number'.
class C3 extends Constructor<T3>() { length: string }
~~
!!! error TS2415: Class 'C3' incorrectly extends base class 'number[]'.
!!! error TS2415: Types of property 'length' are incompatible.
!!! error TS2415: Type 'string' is not assignable to type 'number'.
class C4 extends Constructor<T4>() { 0: number }
~~
!!! error TS2415: Class 'C4' incorrectly extends base class '[string, number]'.
!!! error TS2415: Types of property '0' are incompatible.
!!! error TS2415: Type 'number' is not assignable to type 'string'.
class C5 extends Constructor<T5>() { c: number }
~~
!!! error TS2415: Class 'C5' incorrectly extends base class 'T5'.
!!! error TS2415: Types of property 'c' are incompatible.
!!! error TS2415: Type 'number' is not assignable to type 'string'.
declare class CX { static a: string }
declare enum EX { A, B, C }
declare namespace NX { export const a = "hello" }
type TCX = typeof CX;
type TEX = typeof EX;
type TNX = typeof NX;
interface I10 extends TCX { a: number }
~~~
!!! error TS2430: Interface 'I10' incorrectly extends interface 'typeof CX'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'number' is not assignable to type 'string'.
interface I11 extends TEX { C: string }
~~~
!!! error TS2430: Interface 'I11' incorrectly extends interface 'typeof EX'.
!!! error TS2430: Types of property 'C' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'EX'.
interface I12 extends TNX { a: number }
~~~
!!! error TS2430: Interface 'I12' incorrectly extends interface 'typeof NX'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'number' is not assignable to type '"hello"'.
interface I14 extends TCX { [x: string]: number }
~~~~~~~~~~~~~~~~~~~
!!! error TS2411: Property 'a' of type 'string' is not assignable to string index type 'number'.
~~~~~~~~~~~~~~~~~~~
!!! error TS2411: Property 'prototype' of type 'CX' is not assignable to string index type 'number'.
interface I15 extends TEX { [x: string]: number }
~~~~~~~~~~~~~~~~~~~
!!! error TS2413: Numeric index type 'string' is not assignable to string index type 'number'.
interface I16 extends TNX { [x: string]: number }
~~~~~~~~~~~~~~~~~~~
!!! error TS2411: Property 'a' of type '"hello"' is not assignable to string index type 'number'.
type Identifiable<T> = { _id: string } & T;
interface I20 extends Partial<T1> { a: string }
~~~
!!! error TS2430: Interface 'I20' incorrectly extends interface 'Partial<T1>'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number | undefined'.
interface I21 extends Readonly<T1> { a: string }
~~~
!!! error TS2430: Interface 'I21' incorrectly extends interface 'Readonly<T1>'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
interface I22 extends Identifiable<T1> { a: string }
~~~
!!! error TS2430: Interface 'I22' incorrectly extends interface 'Identifiable<T1>'.
!!! error TS2430: Type 'I22' is not assignable to type 'T1'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
interface I23 extends Identifiable<T1 & { b: number}> { a: string }
~~~
!!! error TS2430: Interface 'I23' incorrectly extends interface 'Identifiable<T1 & { b: number; }>'.
!!! error TS2430: Type 'I23' is not assignable to type 'T1'.
!!! error TS2430: Types of property 'a' are incompatible.
!!! error TS2430: Type 'string' is not assignable to type 'number'.
type U = { a: number } | { b: string };
interface I30 extends U { x: string }
~
!!! error TS2312: An interface may only extend a class or another interface.
interface I31<T> extends T { x: string }
~
!!! error TS2312: An interface may only extend a class or another interface.

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@ -0,0 +1,97 @@
//// [interfaceExtendsObjectIntersectionErrors.ts]
type T1 = { a: number };
type T2 = T1 & { b: number };
type T3 = number[];
type T4 = [string, number];
type T5 = { [P in 'a' | 'b' | 'c']: string };
interface I1 extends T1 { a: string }
interface I2 extends T2 { b: string }
interface I3 extends T3 { length: string }
interface I4 extends T4 { 0: number }
interface I5 extends T5 { c: number }
type Constructor<T> = new () => T;
declare function Constructor<T>(): Constructor<T>;
class C1 extends Constructor<T1>() { a: string }
class C2 extends Constructor<T2>() { b: string }
class C3 extends Constructor<T3>() { length: string }
class C4 extends Constructor<T4>() { 0: number }
class C5 extends Constructor<T5>() { c: number }
declare class CX { static a: string }
declare enum EX { A, B, C }
declare namespace NX { export const a = "hello" }
type TCX = typeof CX;
type TEX = typeof EX;
type TNX = typeof NX;
interface I10 extends TCX { a: number }
interface I11 extends TEX { C: string }
interface I12 extends TNX { a: number }
interface I14 extends TCX { [x: string]: number }
interface I15 extends TEX { [x: string]: number }
interface I16 extends TNX { [x: string]: number }
type Identifiable<T> = { _id: string } & T;
interface I20 extends Partial<T1> { a: string }
interface I21 extends Readonly<T1> { a: string }
interface I22 extends Identifiable<T1> { a: string }
interface I23 extends Identifiable<T1 & { b: number}> { a: string }
type U = { a: number } | { b: string };
interface I30 extends U { x: string }
interface I31<T> extends T { x: string }
//// [interfaceExtendsObjectIntersectionErrors.js]
var __extends = (this && this.__extends) || (function () {
var extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var C1 = (function (_super) {
__extends(C1, _super);
function C1() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C1;
}(Constructor()));
var C2 = (function (_super) {
__extends(C2, _super);
function C2() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C2;
}(Constructor()));
var C3 = (function (_super) {
__extends(C3, _super);
function C3() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C3;
}(Constructor()));
var C4 = (function (_super) {
__extends(C4, _super);
function C4() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C4;
}(Constructor()));
var C5 = (function (_super) {
__extends(C5, _super);
function C5() {
return _super !== null && _super.apply(this, arguments) || this;
}
return C5;
}(Constructor()));

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@ -0,0 +1,57 @@
//// [intersectionThisTypes.ts]
interface Thing1 {
a: number;
self(): this;
}
interface Thing2 {
b: number;
me(): this;
}
type Thing3 = Thing1 & Thing2;
type Thing4 = Thing3 & string[];
function f1(t: Thing3) {
t = t.self();
t = t.me().self().me();
}
interface Thing5 extends Thing4 {
c: string;
}
function f2(t: Thing5) {
t = t.self();
t = t.me().self().me();
}
interface Component {
extend<T>(props: T): this & T;
}
interface Label extends Component {
title: string;
}
function test(label: Label) {
const extended = label.extend({ id: 67 }).extend({ tag: "hello" });
extended.id; // Ok
extended.tag; // Ok
}
//// [intersectionThisTypes.js]
function f1(t) {
t = t.self();
t = t.me().self().me();
}
function f2(t) {
t = t.self();
t = t.me().self().me();
}
function test(label) {
var extended = label.extend({ id: 67 }).extend({ tag: "hello" });
extended.id; // Ok
extended.tag; // Ok
}

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@ -0,0 +1,127 @@
=== tests/cases/conformance/types/intersection/intersectionThisTypes.ts ===
interface Thing1 {
>Thing1 : Symbol(Thing1, Decl(intersectionThisTypes.ts, 0, 0))
a: number;
>a : Symbol(Thing1.a, Decl(intersectionThisTypes.ts, 0, 18))
self(): this;
>self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
}
interface Thing2 {
>Thing2 : Symbol(Thing2, Decl(intersectionThisTypes.ts, 3, 1))
b: number;
>b : Symbol(Thing2.b, Decl(intersectionThisTypes.ts, 5, 18))
me(): this;
>me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
}
type Thing3 = Thing1 & Thing2;
>Thing3 : Symbol(Thing3, Decl(intersectionThisTypes.ts, 8, 1))
>Thing1 : Symbol(Thing1, Decl(intersectionThisTypes.ts, 0, 0))
>Thing2 : Symbol(Thing2, Decl(intersectionThisTypes.ts, 3, 1))
type Thing4 = Thing3 & string[];
>Thing4 : Symbol(Thing4, Decl(intersectionThisTypes.ts, 10, 30))
>Thing3 : Symbol(Thing3, Decl(intersectionThisTypes.ts, 8, 1))
function f1(t: Thing3) {
>f1 : Symbol(f1, Decl(intersectionThisTypes.ts, 11, 32))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 13, 12))
>Thing3 : Symbol(Thing3, Decl(intersectionThisTypes.ts, 8, 1))
t = t.self();
>t : Symbol(t, Decl(intersectionThisTypes.ts, 13, 12))
>t.self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 13, 12))
>self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
t = t.me().self().me();
>t : Symbol(t, Decl(intersectionThisTypes.ts, 13, 12))
>t.me().self().me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>t.me().self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>t.me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 13, 12))
>me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
}
interface Thing5 extends Thing4 {
>Thing5 : Symbol(Thing5, Decl(intersectionThisTypes.ts, 16, 1))
>Thing4 : Symbol(Thing4, Decl(intersectionThisTypes.ts, 10, 30))
c: string;
>c : Symbol(Thing5.c, Decl(intersectionThisTypes.ts, 18, 33))
}
function f2(t: Thing5) {
>f2 : Symbol(f2, Decl(intersectionThisTypes.ts, 20, 1))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 22, 12))
>Thing5 : Symbol(Thing5, Decl(intersectionThisTypes.ts, 16, 1))
t = t.self();
>t : Symbol(t, Decl(intersectionThisTypes.ts, 22, 12))
>t.self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 22, 12))
>self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
t = t.me().self().me();
>t : Symbol(t, Decl(intersectionThisTypes.ts, 22, 12))
>t.me().self().me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>t.me().self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>t.me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>t : Symbol(t, Decl(intersectionThisTypes.ts, 22, 12))
>me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
>self : Symbol(Thing1.self, Decl(intersectionThisTypes.ts, 1, 14))
>me : Symbol(Thing2.me, Decl(intersectionThisTypes.ts, 6, 14))
}
interface Component {
>Component : Symbol(Component, Decl(intersectionThisTypes.ts, 25, 1))
extend<T>(props: T): this & T;
>extend : Symbol(Component.extend, Decl(intersectionThisTypes.ts, 27, 21))
>T : Symbol(T, Decl(intersectionThisTypes.ts, 28, 11))
>props : Symbol(props, Decl(intersectionThisTypes.ts, 28, 14))
>T : Symbol(T, Decl(intersectionThisTypes.ts, 28, 11))
>T : Symbol(T, Decl(intersectionThisTypes.ts, 28, 11))
}
interface Label extends Component {
>Label : Symbol(Label, Decl(intersectionThisTypes.ts, 29, 1))
>Component : Symbol(Component, Decl(intersectionThisTypes.ts, 25, 1))
title: string;
>title : Symbol(Label.title, Decl(intersectionThisTypes.ts, 31, 35))
}
function test(label: Label) {
>test : Symbol(test, Decl(intersectionThisTypes.ts, 33, 1))
>label : Symbol(label, Decl(intersectionThisTypes.ts, 35, 14))
>Label : Symbol(Label, Decl(intersectionThisTypes.ts, 29, 1))
const extended = label.extend({ id: 67 }).extend({ tag: "hello" });
>extended : Symbol(extended, Decl(intersectionThisTypes.ts, 36, 9))
>label.extend({ id: 67 }).extend : Symbol(Component.extend, Decl(intersectionThisTypes.ts, 27, 21))
>label.extend : Symbol(Component.extend, Decl(intersectionThisTypes.ts, 27, 21))
>label : Symbol(label, Decl(intersectionThisTypes.ts, 35, 14))
>extend : Symbol(Component.extend, Decl(intersectionThisTypes.ts, 27, 21))
>id : Symbol(id, Decl(intersectionThisTypes.ts, 36, 35))
>extend : Symbol(Component.extend, Decl(intersectionThisTypes.ts, 27, 21))
>tag : Symbol(tag, Decl(intersectionThisTypes.ts, 36, 54))
extended.id; // Ok
>extended.id : Symbol(id, Decl(intersectionThisTypes.ts, 36, 35))
>extended : Symbol(extended, Decl(intersectionThisTypes.ts, 36, 9))
>id : Symbol(id, Decl(intersectionThisTypes.ts, 36, 35))
extended.tag; // Ok
>extended.tag : Symbol(tag, Decl(intersectionThisTypes.ts, 36, 54))
>extended : Symbol(extended, Decl(intersectionThisTypes.ts, 36, 9))
>tag : Symbol(tag, Decl(intersectionThisTypes.ts, 36, 54))
}

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@ -0,0 +1,145 @@
=== tests/cases/conformance/types/intersection/intersectionThisTypes.ts ===
interface Thing1 {
>Thing1 : Thing1
a: number;
>a : number
self(): this;
>self : () => this
}
interface Thing2 {
>Thing2 : Thing2
b: number;
>b : number
me(): this;
>me : () => this
}
type Thing3 = Thing1 & Thing2;
>Thing3 : Thing3
>Thing1 : Thing1
>Thing2 : Thing2
type Thing4 = Thing3 & string[];
>Thing4 : Thing4
>Thing3 : Thing3
function f1(t: Thing3) {
>f1 : (t: Thing3) => void
>t : Thing3
>Thing3 : Thing3
t = t.self();
>t = t.self() : Thing3
>t : Thing3
>t.self() : Thing3
>t.self : () => Thing3
>t : Thing3
>self : () => Thing3
t = t.me().self().me();
>t = t.me().self().me() : Thing3
>t : Thing3
>t.me().self().me() : Thing3
>t.me().self().me : () => Thing3
>t.me().self() : Thing3
>t.me().self : () => Thing3
>t.me() : Thing3
>t.me : () => Thing3
>t : Thing3
>me : () => Thing3
>self : () => Thing3
>me : () => Thing3
}
interface Thing5 extends Thing4 {
>Thing5 : Thing5
>Thing4 : Thing4
c: string;
>c : string
}
function f2(t: Thing5) {
>f2 : (t: Thing5) => void
>t : Thing5
>Thing5 : Thing5
t = t.self();
>t = t.self() : Thing5
>t : Thing5
>t.self() : Thing5
>t.self : () => Thing5
>t : Thing5
>self : () => Thing5
t = t.me().self().me();
>t = t.me().self().me() : Thing5
>t : Thing5
>t.me().self().me() : Thing5
>t.me().self().me : () => Thing5
>t.me().self() : Thing5
>t.me().self : () => Thing5
>t.me() : Thing5
>t.me : () => Thing5
>t : Thing5
>me : () => Thing5
>self : () => Thing5
>me : () => Thing5
}
interface Component {
>Component : Component
extend<T>(props: T): this & T;
>extend : <T>(props: T) => this & T
>T : T
>props : T
>T : T
>T : T
}
interface Label extends Component {
>Label : Label
>Component : Component
title: string;
>title : string
}
function test(label: Label) {
>test : (label: Label) => void
>label : Label
>Label : Label
const extended = label.extend({ id: 67 }).extend({ tag: "hello" });
>extended : Label & { id: number; } & { tag: string; }
>label.extend({ id: 67 }).extend({ tag: "hello" }) : Label & { id: number; } & { tag: string; }
>label.extend({ id: 67 }).extend : <T>(props: T) => Label & { id: number; } & T
>label.extend({ id: 67 }) : Label & { id: number; }
>label.extend : <T>(props: T) => Label & T
>label : Label
>extend : <T>(props: T) => Label & T
>{ id: 67 } : { id: number; }
>id : number
>67 : 67
>extend : <T>(props: T) => Label & { id: number; } & T
>{ tag: "hello" } : { tag: string; }
>tag : string
>"hello" : "hello"
extended.id; // Ok
>extended.id : number
>extended : Label & { id: number; } & { tag: string; }
>id : number
extended.tag; // Ok
>extended.tag : string
>extended : Label & { id: number; } & { tag: string; }
>tag : string
}

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@ -1,19 +1,13 @@
tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts(4,22): error TS2312: An interface may only extend a class or another interface.
tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts(5,21): error TS2422: A class may only implement another class or interface.
tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts(10,6): error TS2300: Duplicate identifier 'T2'.
tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts(11,6): error TS2300: Duplicate identifier 'T2'.
==== tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts (4 errors) ====
==== tests/cases/conformance/types/typeAliases/typeAliasesForObjectTypes.ts (2 errors) ====
type T1 = { x: string }
// An interface can be named in an extends or implements clause, but a type alias for an object type literal cannot.
interface I1 extends T1 { y: string }
~~
!!! error TS2312: An interface may only extend a class or another interface.
class C1 implements T1 {
~~
!!! error TS2422: A class may only implement another class or interface.
x: string;
}

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@ -0,0 +1,55 @@
// @strictNullChecks: true
type T1 = { a: number };
type T2 = T1 & { b: number };
type T3 = () => void;
type T4 = new () => { a: number };
type T5 = number[];
type T6 = [string, number];
type T7 = { [P in 'a' | 'b' | 'c']: string };
interface I1 extends T1 { x: string }
interface I2 extends T2 { x: string }
interface I3 extends T3 { x: string }
interface I4 extends T4 { x: string }
interface I5 extends T5 { x: string }
interface I6 extends T6 { x: string }
interface I7 extends T7 { x: string }
type Constructor<T> = new () => T;
declare function Constructor<T>(): Constructor<T>;
class C1 extends Constructor<I1>() { x: string }
class C2 extends Constructor<I2>() { x: string }
class C3 extends Constructor<I3>() { x: string }
class C4 extends Constructor<I4>() { x: string }
class C5 extends Constructor<I5>() { x: string }
class C6 extends Constructor<I6>() { x: string }
class C7 extends Constructor<I7>() { x: string }
declare function fx(x: string): string;
declare class CX { a: number }
declare enum EX { A, B, C }
declare namespace NX { export const a = 1 }
type T10 = typeof fx;
type T11 = typeof CX;
type T12 = typeof EX;
type T13 = typeof NX;
interface I10 extends T10 { x: string }
interface I11 extends T11 { x: string }
interface I12 extends T12 { x: string }
interface I13 extends T13 { x: string }
type Identifiable<T> = { _id: string } & T;
interface I20 extends Partial<T1> { x: string }
interface I21 extends Readonly<T1> { x: string }
interface I22 extends Identifiable<T1> { x: string }
interface I23 extends Identifiable<T1 & { b: number}> { x: string }
class C20 extends Constructor<Partial<T1>>() { x: string }
class C21 extends Constructor<Readonly<T1>>() { x: string }
class C22 extends Constructor<Identifiable<T1>>() { x: string }
class C23 extends Constructor<Identifiable<T1 & { b: number}>>() { x: string }

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@ -0,0 +1,49 @@
// @strictNullChecks: true
type T1 = { a: number };
type T2 = T1 & { b: number };
type T3 = number[];
type T4 = [string, number];
type T5 = { [P in 'a' | 'b' | 'c']: string };
interface I1 extends T1 { a: string }
interface I2 extends T2 { b: string }
interface I3 extends T3 { length: string }
interface I4 extends T4 { 0: number }
interface I5 extends T5 { c: number }
type Constructor<T> = new () => T;
declare function Constructor<T>(): Constructor<T>;
class C1 extends Constructor<T1>() { a: string }
class C2 extends Constructor<T2>() { b: string }
class C3 extends Constructor<T3>() { length: string }
class C4 extends Constructor<T4>() { 0: number }
class C5 extends Constructor<T5>() { c: number }
declare class CX { static a: string }
declare enum EX { A, B, C }
declare namespace NX { export const a = "hello" }
type TCX = typeof CX;
type TEX = typeof EX;
type TNX = typeof NX;
interface I10 extends TCX { a: number }
interface I11 extends TEX { C: string }
interface I12 extends TNX { a: number }
interface I14 extends TCX { [x: string]: number }
interface I15 extends TEX { [x: string]: number }
interface I16 extends TNX { [x: string]: number }
type Identifiable<T> = { _id: string } & T;
interface I20 extends Partial<T1> { a: string }
interface I21 extends Readonly<T1> { a: string }
interface I22 extends Identifiable<T1> { a: string }
interface I23 extends Identifiable<T1 & { b: number}> { a: string }
type U = { a: number } | { b: string };
interface I30 extends U { x: string }
interface I31<T> extends T { x: string }

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@ -0,0 +1,40 @@
interface Thing1 {
a: number;
self(): this;
}
interface Thing2 {
b: number;
me(): this;
}
type Thing3 = Thing1 & Thing2;
type Thing4 = Thing3 & string[];
function f1(t: Thing3) {
t = t.self();
t = t.me().self().me();
}
interface Thing5 extends Thing4 {
c: string;
}
function f2(t: Thing5) {
t = t.self();
t = t.me().self().me();
}
interface Component {
extend<T>(props: T): this & T;
}
interface Label extends Component {
title: string;
}
function test(label: Label) {
const extended = label.extend({ id: 67 }).extend({ tag: "hello" });
extended.id; // Ok
extended.tag; // Ok
}