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tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(7,8): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(7,29): error TS1005: ',' expected.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(8,4): error TS2345: Argument of type '[number, number, string[][], string]' is not assignable to parameter of type '[number, number, string[][]]'.
Source has 4 element(s) but target allows only 3.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(16,8): error TS2371: A parameter initializer is only allowed in a function or constructor implementation.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(16,16): error TS2371: A parameter initializer is only allowed in a function or constructor implementation.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(23,16): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(30,14): error TS2300: Duplicate identifier 'z'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(30,18): error TS2300: Duplicate identifier 'z'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(34,6): error TS2322: Type 'number' is not assignable to type '{ x: any; y: { j: any; }; }'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(35,4): error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
Property 'z' is missing in type '{}' but required in type '{ z: number; }'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(36,6): error TS2322: Type 'boolean' is not assignable to type 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(37,6): error TS2322: Type 'boolean' is not assignable to type 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(38,6): error TS2322: Type 'boolean' is not assignable to type 'string | number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(39,11): error TS2322: Type 'boolean' is not assignable to type '[[any]]'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(40,13): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(46,13): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(47,13): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(56,8): error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(57,5): error TS2416: Property 'd4' in type 'C4' is not assignable to the same property in base type 'F2'.
Type '({ x, y, c }: { x: any; y: any; c: any; }) => void' is not assignable to type '({ x, y, z }?: { x: any; y: any; z: any; }) => any'.
Types of parameters '__0' and '__0' are incompatible.
Property 'c' is missing in type '{ x: any; y: any; z: any; }' but required in type '{ x: any; y: any; c: any; }'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(65,18): error TS2300: Duplicate identifier 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(65,26): error TS2300: Duplicate identifier 'number'.
tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts(65,34): error TS2300: Duplicate identifier 'number'.
==== tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts (22 errors) ====
// A parameter declaration may specify either an identifier or a binding pattern.
// The identifiers specified in parameter declarations and binding patterns
// in a parameter list must be unique within that parameter list.
// If the declaration includes a type annotation, the parameter is of that type
function a0([a, b, [[c]]]: [number, number, string[][]]) { }
a0([1, "string", [["world"]]); // Error
~~~~~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
~
!!! error TS1005: ',' expected.
a0([1, 2, [["world"]], "string"]); // Error
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2345: Argument of type '[number, number, string[][], string]' is not assignable to parameter of type '[number, number, string[][]]'.
!!! error TS2345: Source has 4 element(s) but target allows only 3.
// If the declaration includes an initializer expression (which is permitted only
// when the parameter list occurs in conjunction with a function body),
// the parameter type is the widened form (section 3.11) of the type of the initializer expression.
interface F1 {
b0(z = 10, [[a, b], d, {u}] = [[1, 2], "string", { u: false }]); // Error, no function body
~~~~~~
!!! error TS2371: A parameter initializer is only allowed in a function or constructor implementation.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2371: A parameter initializer is only allowed in a function or constructor implementation.
}
function b1(z = null, o = { x: 0, y: undefined }) { }
function b2([a, z, y] = [undefined, null, undefined]) { }
function b3([[a], b, [[c, d]]] = [[undefined], undefined, [[undefined, undefined]]]) { }
b1("string", { x: "string", y: true }); // Error
~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
!!! related TS6500 tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts:19:29: The expected type comes from property 'x' which is declared here on type '{ x: number; y: any; }'
// If the declaration specifies a binding pattern, the parameter type is the implied type of that binding pattern (section 5.1.3)
function c0({z: {x, y: {j}}}) { }
function c1({z} = { z: 10 }) { }
function c2({z = 10}) { }
function c3({b}: { b: number|string } = { b: "hello" }) { }
function c4([z], z: number) { } // Error Duplicate identifier
~
!!! error TS2300: Duplicate identifier 'z'.
~
!!! error TS2300: Duplicate identifier 'z'.
function c5([a, b, [[c]]]) { }
function c6([a, b, [[c = 1]]]) { }
c0({ z: 1 }); // Error, implied type is { z: {x: any, y: {j: any}} }
~
!!! error TS2322: Type 'number' is not assignable to type '{ x: any; y: { j: any; }; }'.
c1({}); // Error, implied type is {z:number}?
~~
!!! error TS2345: Argument of type '{}' is not assignable to parameter of type '{ z: number; }'.
!!! error TS2345: Property 'z' is missing in type '{}' but required in type '{ z: number; }'.
!!! related TS2728 tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts:27:21: 'z' is declared here.
c1({ z: true }); // Error, implied type is {z:number}?
~
!!! error TS2322: Type 'boolean' is not assignable to type 'number'.
!!! related TS6500 tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts:27:21: The expected type comes from property 'z' which is declared here on type '{ z: number; }'
c2({ z: false }); // Error, implied type is {z?: number}
~
!!! error TS2322: Type 'boolean' is not assignable to type 'number'.
c3({ b: true }); // Error, implied type is { b: number|string }.
~
!!! error TS2322: Type 'boolean' is not assignable to type 'string | number'.
!!! related TS6500 tests/cases/conformance/es6/destructuring/destructuringParameterDeclaration2.ts:29:20: The expected type comes from property 'b' which is declared here on type '{ b: string | number; }'
c5([1, 2, false, true]); // Error, implied type is [any, any, [[any]]]
~~~~~
!!! error TS2322: Type 'boolean' is not assignable to type '[[any]]'.
c6([1, 2, [["string"]]]); // Error, implied type is [any, any, [[number]]] // Use initializer
~~~~~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
// A parameter can be marked optional by following its name or binding pattern with a question mark (?)
// or by including an initializer. Initializers (including binding property or element initializers) are
// permitted only when the parameter list occurs in conjunction with a function body
function d1([a, b, c]?) { } // Error, binding pattern can't be optional in implementation signature
~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
function d2({x, y, z}?) { } // Error, binding pattern can't be optional in implementation signature
~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
interface F2 {
d3([a, b, c]?);
d4({x, y, z}?);
e0([a, b, c]);
}
class C4 implements F2 {
d3([a, b, c]?) { } // Error, binding pattern can't be optional in implementation signature
~~~~~~~~~~
!!! error TS2463: A binding pattern parameter cannot be optional in an implementation signature.
d4({x, y, c}) { }
~~
!!! error TS2416: Property 'd4' in type 'C4' is not assignable to the same property in base type 'F2'.
!!! error TS2416: Type '({ x, y, c }: { x: any; y: any; c: any; }) => void' is not assignable to type '({ x, y, z }?: { x: any; y: any; z: any; }) => any'.
!!! error TS2416: Types of parameters '__0' and '__0' are incompatible.
!!! error TS2416: Property 'c' is missing in type '{ x: any; y: any; z: any; }' but required in type '{ x: any; y: any; c: any; }'.
e0([a, b, q]) { }
}
// Destructuring parameter declarations do not permit type annotations on the individual binding patterns,
// as such annotations would conflict with the already established meaning of colons in object literals.
// Type annotations must instead be written on the top- level parameter declaration
function e0({x: [number, number, number]}) { } // error, duplicate identifier;
~~~~~~
!!! error TS2300: Duplicate identifier 'number'.
~~~~~~
!!! error TS2300: Duplicate identifier 'number'.
~~~~~~
!!! error TS2300: Duplicate identifier 'number'.
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