72 lines
1.5 KiB
JavaScript
72 lines
1.5 KiB
JavaScript
/**
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* Test strict type param arity checking.
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*
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* Full type argument lists are required in type expressions,
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* such as type annotations and interface extends clauses.
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* Type arguments are optional in value expressions, such as
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* class extends clauses and calls of polymorphic functions.
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*
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* @flow
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*/
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// arity error in type annotation using polymorphic class
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class MyClass<T> {
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x: T;
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constructor(x: T) {
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this.x = x;
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}
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}
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var c: MyClass = new MyClass(0); // error, missing argument list (1)
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// arity error in type annotation using polymorphic class with defaulting
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class MyClass2<T, U = string> {
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x: T;
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y: U;
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constructor(x: T, y: U) {
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this.x = x;
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this.y = y;
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}
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}
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var c2: MyClass2 = new MyClass2(0, ""); // error, missing argument list (1-2)
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// arity error in type annotation using polymorphic type alias
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type MyObject<T> = {
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x: T;
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}
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var o: MyObject = { x: 0 }; // error, missing argument list
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// arity error in type alias rhs
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type MySubobject = { y: number } & MyObject; // error, missing argument list
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// arity error in interface extends
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interface MyInterface<T> {
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x: T;
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}
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interface MySubinterface extends MyInterface { // error, missing argument list
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y: number;
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}
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// *no* arity error in extends of polymorphic class
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class MySubclass extends MyClass { // ok, type arg inferred
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y: number;
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constructor(y: number) {
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super(y);
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}
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}
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// *no* arity error in call of polymorphic function
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function singleton<T>(x: T):Array<T> { return [x]; }
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var num_array:Array<number> = singleton(0); // ok, type arg inferred
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