158 lines
4.8 KiB
TypeScript
158 lines
4.8 KiB
TypeScript
// @allowUnreachableCode: true
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// FunctionExpression with no return type annotation and no return statement returns void
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var v: void = function () { } ();
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// FunctionExpression f with no return type annotation and directly references f in its body returns any
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var a: any = function f() {
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return f;
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};
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var a: any = function f() {
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return f();
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};
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// FunctionExpression f with no return type annotation and indirectly references f in its body returns any
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var a: any = function f() {
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var x = f;
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return x;
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};
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// Two mutually recursive function implementations with no return type annotations
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function rec1() {
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return rec2();
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}
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function rec2() {
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return rec1();
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}
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var a = rec1();
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var a = rec2();
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// Two mutually recursive function implementations with return type annotation in one
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function rec3(): number {
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return rec4();
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}
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function rec4() {
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return rec3();
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}
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var n: number;
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var n = rec3();
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var n = rec4();
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// FunctionExpression with no return type annotation and returns a number
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var n = function () {
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return 3;
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} ();
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// FunctionExpression with no return type annotation and returns null
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var nu = null;
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var nu = function () {
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return null;
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} ();
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// FunctionExpression with no return type annotation and returns undefined
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var un = undefined;
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var un = function () {
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return undefined;
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} ();
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// FunctionExpression with no return type annotation and returns a type parameter type
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var n = function <T>(x: T) {
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return x;
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} (4);
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// FunctionExpression with no return type annotation and returns a constrained type parameter type
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var n = function <T extends {}>(x: T) {
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return x;
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} (4);
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// FunctionExpression with no return type annotation with multiple return statements with identical types
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var n = function () {
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return 3;
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return 5;
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}();
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// Otherwise, the inferred return type is the first of the types of the return statement expressions
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// in the function body that is a supertype of each of the others,
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// ignoring return statements with no expressions.
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// A compile - time error occurs if no return statement expression has a type that is a supertype of each of the others.
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// FunctionExpression with no return type annotation with multiple return statements with subtype relation between returns
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class Base { private m; }
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class Derived extends Base { private q; }
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var b: Base;
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var b = function () {
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return new Base(); return new Derived();
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} ();
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// FunctionExpression with no return type annotation with multiple return statements with one a recursive call
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var a = function f() {
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return new Base(); return new Derived(); return f(); // ?
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} ();
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// FunctionExpression with non -void return type annotation with a single throw statement
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undefined === function (): number {
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throw undefined;
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};
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// Type of 'this' in function implementation is 'any'
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function thisFunc() {
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var x = this;
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var x: any;
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}
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// Function signature with optional parameter, no type annotation and initializer has initializer's type
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function opt1(n = 4) {
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var m = n;
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var m: number;
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}
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// Function signature with optional parameter, no type annotation and initializer has initializer's widened type
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function opt2(n = { x: null, y: undefined }) {
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var m = n;
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var m: { x: any; y: any };
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}
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// Function signature with initializer referencing other parameter to the left
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function opt3(n: number, m = n) {
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var y = m;
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var y: number;
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}
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// Function signature with optional parameter has correct codegen
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// (tested above)
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// FunctionExpression with non -void return type annotation return with no expression
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function f6(): number {
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return;
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}
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class Derived2 extends Base { private r: string; }
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class AnotherClass { private x }
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// if f is a contextually typed function expression, the inferred return type is the union type
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// of the types of the return statement expressions in the function body,
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// ignoring return statements with no expressions.
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var f7: (x: number) => string | number = x => { // should be (x: number) => number | string
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if (x < 0) { return x; }
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return x.toString();
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}
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var f8: (x: number) => any = x => { // should be (x: number) => Base
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return new Base();
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return new Derived2();
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}
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var f9: (x: number) => any = x => { // should be (x: number) => Base
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return new Base();
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return new Derived();
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return new Derived2();
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}
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var f10: (x: number) => any = x => { // should be (x: number) => Derived | Derived1
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return new Derived();
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return new Derived2();
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}
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var f11: (x: number) => any = x => { // should be (x: number) => Base | AnotherClass
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return new Base();
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return new AnotherClass();
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}
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var f12: (x: number) => any = x => { // should be (x: number) => Base | AnotherClass
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return new Base();
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return; // should be ignored
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return new AnotherClass();
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} |