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https://github.com/swc-project/swc.git
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56 lines
2.6 KiB
TypeScript
56 lines
2.6 KiB
TypeScript
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// ElementList: ( Modified )
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// Elisionopt AssignmentExpression
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// Elisionopt SpreadElement
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// ElementList, Elisionopt AssignmentExpression
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// ElementList, Elisionopt SpreadElement
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// SpreadElement:
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// ... AssignmentExpression
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var a0 = [,, 2, 3, 4]
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var a1 = ["hello", "world"]
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var a2 = [, , , ...a0, "hello"];
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var a3 = [,, ...a0]
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var a4 = [() => 1, ];
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var a5 = [...a0, , ]
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// Each element expression in a non-empty array literal is processed as follows:
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// - If the array literal contains no spread elements, and if the array literal is contextually typed (section 4.19)
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// by a type T and T has a property with the numeric name N, where N is the index of the element expression in the array literal,
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// the element expression is contextually typed by the type of that property.
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is contextually typed by a tuple-like type,
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var b0: [any, any, any] = [undefined, null, undefined];
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var b1: [number[], string[]] = [[1, 2, 3], ["hello", "string"]];
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// The resulting type an array literal expression is determined as follows:
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// - If the array literal contains no spread elements and is an array assignment pattern in a destructuring assignment (section 4.17.1),
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// the resulting type is a tuple type constructed from the types of the element expressions.
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var [c0, c1] = [1, 2]; // tuple type [number, number]
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var [c2, c3] = [1, 2, true]; // tuple type [number, number, boolean]
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// The resulting type an array literal expression is determined as follows:
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// - the resulting type is an array type with an element type that is the union of the types of the
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// non - spread element expressions and the numeric index signature types of the spread element expressions
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var temp = ["s", "t", "r"];
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var temp1 = [1, 2, 3];
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var temp2: [number[], string[]] = [[1, 2, 3], ["hello", "string"]];
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var temp3 = [undefined, null, undefined];
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var temp4 = [];
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interface myArray extends Array<Number> { }
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interface myArray2 extends Array<Number|String> { }
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var d0 = [1, true, ...temp,]; // has type (string|number|boolean)[]
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var d1 = [...temp]; // has type string[]
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var d2: number[] = [...temp1];
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var d3: myArray = [...temp1];
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var d4: myArray2 = [...temp, ...temp1];
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var d5 = [...temp3];
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var d6 = [...temp4];
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var d7 = [...[...temp1]];
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var d8: number[][] = [[...temp1]]
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var d9 = [[...temp1], ...["hello"]];
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