104 lines
2.3 KiB
Plaintext
104 lines
2.3 KiB
Plaintext
=== tests/cases/conformance/types/union/unionTypeFromArrayLiteral.ts ===
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// The resulting type an array literal expression is determined as follows:
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// If the array literal is empty, the resulting type is an array type with the element type Undefined.
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// Otherwise, if the array literal is contextually typed by a type that has a property with the numeric name ‘0’, the resulting type is a tuple type constructed from the types of the element expressions.
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// Otherwise, the resulting type is an array type with an element type that is the union of the types of the element expressions.
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var arr1 = [1, 2]; // number[]
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>arr1 : number[]
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>[1, 2] : number[]
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>1 : number
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>2 : number
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var arr2 = ["hello", true]; // (string | number)[]
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>arr2 : (string | boolean)[]
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>["hello", true] : (string | boolean)[]
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>"hello" : string
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>true : boolean
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var arr3Tuple: [number, string] = [3, "three"]; // [number, string]
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>arr3Tuple : [number, string]
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>[3, "three"] : [number, string]
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>3 : number
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>"three" : string
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var arr4Tuple: [number, string] = [3, "three", "hello"]; // [number, string, string]
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>arr4Tuple : [number, string]
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>[3, "three", "hello"] : [number, string, string]
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>3 : number
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>"three" : string
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>"hello" : string
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var arrEmpty = [];
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>arrEmpty : any[]
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>[] : undefined[]
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var arr5Tuple: {
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>arr5Tuple : { 0: string; 5: number; }
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0: string;
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5: number;
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} = ["hello", true, false, " hello", true, 10, "any"]; // Tuple
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>["hello", true, false, " hello", true, 10, "any"] : [string, boolean, boolean, string, boolean, number, string]
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>"hello" : string
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>true : boolean
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>false : boolean
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>" hello" : string
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>true : boolean
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>10 : number
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>"any" : string
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class C { foo() { } }
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>C : C
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>foo : () => void
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class D { foo2() { } }
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>D : D
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>foo2 : () => void
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class E extends C { foo3() { } }
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>E : E
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>C : C
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>foo3 : () => void
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class F extends C { foo4() { } }
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>F : F
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>C : C
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>foo4 : () => void
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var c: C, d: D, e: E, f: F;
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>c : C
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>C : C
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>d : D
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>D : D
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>e : E
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>E : E
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>f : F
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>F : F
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var arr6 = [c, d]; // (C | D)[]
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>arr6 : (C | D)[]
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>[c, d] : (C | D)[]
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>c : C
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>d : D
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var arr7 = [c, d, e]; // (C | D)[]
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>arr7 : (C | D)[]
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>[c, d, e] : (C | D)[]
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>c : C
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>d : D
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>e : E
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var arr8 = [c, e]; // C[]
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>arr8 : C[]
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>[c, e] : C[]
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>c : C
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>e : E
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var arr9 = [e, f]; // (E|F)[]
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>arr9 : (E | F)[]
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>[e, f] : (E | F)[]
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>e : E
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>f : F
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