=== tests/cases/conformance/expressions/functions/arrowFunctionExpressions.ts === // ArrowFormalParameters => AssignmentExpression is equivalent to ArrowFormalParameters => { return AssignmentExpression; } var a = (p: string) => p.length; >a : (p: string) => number >(p: string) => p.length : (p: string) => number >p : string >p.length : number >p : string >length : number var a = (p: string) => { return p.length; } >a : (p: string) => number >(p: string) => { return p.length; } : (p: string) => number >p : string >p.length : number >p : string >length : number // Identifier => Block is equivalent to(Identifier) => Block var b = j => { return 0; } >b : (j: any) => number >j => { return 0; } : (j: any) => number >j : any >0 : number var b = (j) => { return 0; } >b : (j: any) => number >(j) => { return 0; } : (j: any) => number >j : any >0 : number // Identifier => AssignmentExpression is equivalent to(Identifier) => AssignmentExpression var c: number; >c : number var d = n => c = n; >d : (n: any) => any >n => c = n : (n: any) => any >n : any >c = n : any >c : number >n : any var d = (n) => c = n; >d : (n: any) => any >(n) => c = n : (n: any) => any >n : any >c = n : any >c : number >n : any var d: (n: any) => any; >d : (n: any) => any >n : any // Binding patterns in arrow functions var p1 = ([a]) => { }; >p1 : ([a]: [any]) => void >([a]) => { } : ([a]: [any]) => void >a : any var p2 = ([...a]) => { }; >p2 : ([...a]: any[]) => void >([...a]) => { } : ([...a]: any[]) => void >a : any[] var p3 = ([, a]) => { }; >p3 : ([, a]: [any, any]) => void >([, a]) => { } : ([, a]: [any, any]) => void > : undefined >a : any var p4 = ([, ...a]) => { }; >p4 : ([, ...a]: any[]) => void >([, ...a]) => { } : ([, ...a]: any[]) => void > : undefined >a : any[] var p5 = ([a = 1]) => { }; >p5 : ([a = 1]: [number]) => void >([a = 1]) => { } : ([a = 1]: [number]) => void >a : number >1 : number var p6 = ({ a }) => { }; >p6 : ({ a }: { a: any; }) => void >({ a }) => { } : ({ a }: { a: any; }) => void >a : any var p7 = ({ a: { b } }) => { }; >p7 : ({ a: { b } }: { a: { b: any; }; }) => void >({ a: { b } }) => { } : ({ a: { b } }: { a: { b: any; }; }) => void >a : any >b : any var p8 = ({ a = 1 }) => { }; >p8 : ({ a = 1 }: { a?: number; }) => void >({ a = 1 }) => { } : ({ a = 1 }: { a?: number; }) => void >a : number >1 : number var p9 = ({ a: { b = 1 } = { b: 1 } }) => { }; >p9 : ({ a: { b = 1 } = { b: 1 } }: { a?: { b: number; }; }) => void >({ a: { b = 1 } = { b: 1 } }) => { } : ({ a: { b = 1 } = { b: 1 } }: { a?: { b: number; }; }) => void >a : any >b : number >1 : number >{ b: 1 } : { b: number; } >b : number >1 : number var p10 = ([{ value, done }]) => { }; >p10 : ([{ value, done }]: [{ value: any; done: any; }]) => void >([{ value, done }]) => { } : ([{ value, done }]: [{ value: any; done: any; }]) => void >value : any >done : any // Arrow function used in class member initializer // Arrow function used in class member function class MyClass { >MyClass : MyClass m = (n) => n + 1; >m : (n: any) => any >(n) => n + 1 : (n: any) => any >n : any >n + 1 : any >n : any >1 : number p = (n) => n && this; >p : (n: any) => MyClass >(n) => n && this : (n: any) => MyClass >n : any >n && this : MyClass >n : any >this : MyClass fn() { >fn : () => void var m = (n) => n + 1; >m : (n: any) => any >(n) => n + 1 : (n: any) => any >n : any >n + 1 : any >n : any >1 : number var p = (n) => n && this; >p : (n: any) => MyClass >(n) => n && this : (n: any) => MyClass >n : any >n && this : MyClass >n : any >this : MyClass } } // Arrow function used in arrow function var arrrr = () => (m: number) => () => (n: number) => m + n; >arrrr : () => (m: number) => () => (n: number) => number >() => (m: number) => () => (n: number) => m + n : () => (m: number) => () => (n: number) => number >(m: number) => () => (n: number) => m + n : (m: number) => () => (n: number) => number >m : number >() => (n: number) => m + n : () => (n: number) => number >(n: number) => m + n : (n: number) => number >n : number >m + n : number >m : number >n : number var e = arrrr()(3)()(4); >e : number >arrrr()(3)()(4) : number >arrrr()(3)() : (n: number) => number >arrrr()(3) : () => (n: number) => number >arrrr() : (m: number) => () => (n: number) => number >arrrr : () => (m: number) => () => (n: number) => number >3 : number >4 : number var e: number; >e : number // Arrow function used in arrow function used in function function someFn() { >someFn : () => void var arr = (n: number) => (p: number) => p * n; >arr : (n: number) => (p: number) => number >(n: number) => (p: number) => p * n : (n: number) => (p: number) => number >n : number >(p: number) => p * n : (p: number) => number >p : number >p * n : number >p : number >n : number arr(3)(4).toExponential(); >arr(3)(4).toExponential() : string >arr(3)(4).toExponential : (fractionDigits?: number) => string >arr(3)(4) : number >arr(3) : (p: number) => number >arr : (n: number) => (p: number) => number >3 : number >4 : number >toExponential : (fractionDigits?: number) => string } // Arrow function used in function function someOtherFn() { >someOtherFn : () => void var arr = (n: number) => '' + n; >arr : (n: number) => string >(n: number) => '' + n : (n: number) => string >n : number >'' + n : string >'' : string >n : number arr(4).charAt(0); >arr(4).charAt(0) : string >arr(4).charAt : (pos: number) => string >arr(4) : string >arr : (n: number) => string >4 : number >charAt : (pos: number) => string >0 : number } // Arrow function used in nested function in function function outerFn() { >outerFn : () => void function innerFn() { >innerFn : () => void var arrowFn = () => { }; >arrowFn : () => void >() => { } : () => void var p = arrowFn(); >p : void >arrowFn() : void >arrowFn : () => void var p: void; >p : void } } // Arrow function used in nested function in arrow function var f = (n: string) => { >f : (n: string) => () => string >(n: string) => { function fn(x: number) { return () => n + x; } return fn(4);} : (n: string) => () => string >n : string function fn(x: number) { >fn : (x: number) => () => string >x : number return () => n + x; >() => n + x : () => string >n + x : string >n : string >x : number } return fn(4); >fn(4) : () => string >fn : (x: number) => () => string >4 : number } var g = f('')(); >g : string >f('')() : string >f('') : () => string >f : (n: string) => () => string >'' : string var g: string; >g : string // Arrow function used in nested function in arrow function in nested function function someOuterFn() { >someOuterFn : () => (n: string) => () => () => number var arr = (n: string) => { >arr : (n: string) => () => () => number >(n: string) => { function innerFn() { return () => n.length; } return innerFn; } : (n: string) => () => () => number >n : string function innerFn() { >innerFn : () => () => number return () => n.length; >() => n.length : () => number >n.length : number >n : string >length : number } return innerFn; >innerFn : () => () => number } return arr; >arr : (n: string) => () => () => number } var h = someOuterFn()('')()(); >h : number >someOuterFn()('')()() : number >someOuterFn()('')() : () => number >someOuterFn()('') : () => () => number >someOuterFn() : (n: string) => () => () => number >someOuterFn : () => (n: string) => () => () => number >'' : string h.toExponential(); >h.toExponential() : string >h.toExponential : (fractionDigits?: number) => string >h : number >toExponential : (fractionDigits?: number) => string // Arrow function used in try/catch/finally in function function tryCatchFn() { >tryCatchFn : () => void try { var x = () => this; >x : () => any >() => this : () => any >this : any } catch (e) { >e : any var t = () => e + this; >t : () => any >() => e + this : () => any >e + this : any >e : any >this : any } finally { var m = () => this + ''; >m : () => string >() => this + '' : () => string >this + '' : string >this : any >'' : string } }