swc/crates/swc_ecma_parser/tests/tsc/arrayLiterals2ES5.ts

56 lines
2.6 KiB
TypeScript

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