a4f9bf0fce
* Create type aliases for unresolved type symbols * Accept new baselines * Update fourslash tests * Unresolved import aliases create tagged unresolved symbols * Add comments * Accept new baselines * Add fourslash tests
163 lines
3.8 KiB
Plaintext
163 lines
3.8 KiB
Plaintext
=== tests/cases/conformance/expressions/typeAssertions/typeAssertions.ts ===
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// Function call whose argument is a 1 arg generic function call with explicit type arguments
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function fn1<T>(t: T) { }
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>fn1 : <T>(t: T) => void
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>t : T
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function fn2(t: any) { }
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>fn2 : (t: any) => void
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>t : any
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fn1(fn2<string>(4)); // Error
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>fn1(fn2<string>(4)) : void
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>fn1 : <T>(t: T) => void
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>fn2<string>(4) : void
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>fn2 : (t: any) => void
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>4 : 4
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var a: any;
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>a : any
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var s: string;
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>s : string
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// Type assertion of non - unary expression
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var a = <any>"" + 4;
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>a : any
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><any>"" + 4 : any
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><any>"" : any
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>"" : ""
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>4 : 4
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var s = "" + <any>4;
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>s : string
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>"" + <any>4 : string
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>"" : ""
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><any>4 : any
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>4 : 4
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class SomeBase {
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>SomeBase : SomeBase
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private p;
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>p : any
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}
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class SomeDerived extends SomeBase {
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>SomeDerived : SomeDerived
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>SomeBase : SomeBase
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private x;
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>x : any
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}
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class SomeOther {
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>SomeOther : SomeOther
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private q;
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>q : any
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}
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// Type assertion should check for assignability in either direction
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var someBase = new SomeBase();
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>someBase : SomeBase
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>new SomeBase() : SomeBase
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>SomeBase : typeof SomeBase
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var someDerived = new SomeDerived();
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>someDerived : SomeDerived
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>new SomeDerived() : SomeDerived
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>SomeDerived : typeof SomeDerived
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var someOther = new SomeOther();
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>someOther : SomeOther
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>new SomeOther() : SomeOther
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>SomeOther : typeof SomeOther
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someBase = <SomeBase>someDerived;
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>someBase = <SomeBase>someDerived : SomeBase
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>someBase : SomeBase
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><SomeBase>someDerived : SomeBase
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>someDerived : SomeDerived
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someBase = <SomeBase>someBase;
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>someBase = <SomeBase>someBase : SomeBase
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>someBase : SomeBase
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><SomeBase>someBase : SomeBase
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>someBase : SomeBase
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someBase = <SomeBase>someOther; // Error
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>someBase = <SomeBase>someOther : SomeBase
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>someBase : SomeBase
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><SomeBase>someOther : SomeBase
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>someOther : SomeOther
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someDerived = <SomeDerived>someDerived;
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>someDerived = <SomeDerived>someDerived : SomeDerived
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>someDerived : SomeDerived
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><SomeDerived>someDerived : SomeDerived
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>someDerived : SomeDerived
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someDerived = <SomeDerived>someBase;
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>someDerived = <SomeDerived>someBase : SomeDerived
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>someDerived : SomeDerived
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><SomeDerived>someBase : SomeDerived
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>someBase : SomeBase
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someDerived = <SomeDerived>someOther; // Error
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>someDerived = <SomeDerived>someOther : SomeDerived
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>someDerived : SomeDerived
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><SomeDerived>someOther : SomeDerived
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>someOther : SomeOther
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someOther = <SomeOther>someDerived; // Error
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>someOther = <SomeOther>someDerived : SomeOther
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>someOther : SomeOther
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><SomeOther>someDerived : SomeOther
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>someDerived : SomeDerived
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someOther = <SomeOther>someBase; // Error
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>someOther = <SomeOther>someBase : SomeOther
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>someOther : SomeOther
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><SomeOther>someBase : SomeOther
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>someBase : SomeBase
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someOther = <SomeOther>someOther;
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>someOther = <SomeOther>someOther : SomeOther
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>someOther : SomeOther
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><SomeOther>someOther : SomeOther
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>someOther : SomeOther
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// Type assertion cannot be a type-predicate type
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var numOrStr: number | string;
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>numOrStr : string | number
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var str: string;
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>str : string
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if(<numOrStr is string>(numOrStr === undefined)) { // Error
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><numOrStr is : numOrStr
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>is : any
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>string>(numOrStr === undefined) : boolean
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>string : any
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>(numOrStr === undefined) : boolean
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>numOrStr === undefined : boolean
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>numOrStr : string | number
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>undefined : undefined
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str = numOrStr; // Error, no narrowing occurred
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>str = numOrStr : string | number
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>str : string
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>numOrStr : string | number
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}
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if((numOrStr === undefined) as numOrStr is string) { // Error
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>(numOrStr === undefined) as numOrStr : numOrStr
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>(numOrStr === undefined) : boolean
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>numOrStr === undefined : boolean
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>numOrStr : string | number
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>undefined : undefined
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>is : any
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>string : any
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}
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