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tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(8,1): error TS18048: 's1' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(12,9): error TS2345: Argument of type 'undefined' is not assignable to parameter of type 'string'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(16,9): error TS2345: Argument of type 'undefined' is not assignable to parameter of type 'string'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(23,1): error TS18048: 't1' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(26,1): error TS18048: 't2.z' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(34,5): error TS18048: 'z' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(41,5): error TS18048: 'q.z' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(52,5): error TS18048: 'q.z' is possibly 'undefined'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(62,2): error TS2322: Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.
tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts(71,8): error TS2322: Type 'number | undefined' is not assignable to type 'number'.
Type 'undefined' is not assignable to type 'number'.
==== tests/cases/conformance/pedantic/noUncheckedIndexedAccessDestructuring.ts (10 errors) ====
declare const strArray: string[];
declare const strStrTuple: [string, string];
// Declaration forms for array destructuring
// Destructuring from a simple array -> include undefined
const [s1] = strArray;
s1.toString(); // Should error, s1 possibly undefined
~~
!!! error TS18048: 's1' is possibly 'undefined'.
// Destructuring a rest element -> do not include undefined
const [...s2] = strArray;
s2.push(undefined); // Should error, 'undefined' not part of s2's element type
~~~~~~~~~
!!! error TS2345: Argument of type 'undefined' is not assignable to parameter of type 'string'.
// Destructuring a rest element -> do not include undefined
const [, , ...s3] = strArray;
s3.push(undefined); // Should error, 'undefined' not part of s2's element type
~~~~~~~~~
!!! error TS2345: Argument of type 'undefined' is not assignable to parameter of type 'string'.
// Declaration forms for object destructuring
declare const strMap: { [s: string]: string };
const { t1 } = strMap;
t1.toString(); // Should error, t1 possibly undefined
~~
!!! error TS18048: 't1' is possibly 'undefined'.
const { ...t2 } = strMap;
t2.z.toString(); // Should error
~~~~
!!! error TS18048: 't2.z' is possibly 'undefined'.
// Test intersections with declared properties
declare const numMapPoint: { x: number, y: number} & { [s: string]: number };
{
const { x, y, z } = numMapPoint;
x.toFixed(); // Should OK
y.toFixed(); // Should OK
z.toFixed(); // Should error
~
!!! error TS18048: 'z' is possibly 'undefined'.
}
{
const { x, ...q } = numMapPoint;
x.toFixed(); // Should OK
q.y.toFixed(); // Should OK
q.z.toFixed(); // Should error
~~~
!!! error TS18048: 'q.z' is possibly 'undefined'.
}
{
const { x, ...q } = numMapPoint;
x.
toFixed(); // Should OK
q.
y.toFixed(); // Should OK
q.
~~
z.toFixed(); // Should error
~~~~~
!!! error TS18048: 'q.z' is possibly 'undefined'.
}
declare let target_string: string;
declare let target_string_undef: string | undefined;
declare let target_string_arr: string[];
// Assignment forms
[target_string] = strArray; // Should error
~~~~~~~~~~~~~
!!! error TS2322: Type 'string | undefined' is not assignable to type 'string'.
!!! error TS2322: Type 'undefined' is not assignable to type 'string'.
[target_string_undef] = strArray; // Should OK
[,,, ...target_string_arr] = strArray; // Should OK
{
let x: number, y: number, z: number | undefined;
({ x, y, z } = numMapPoint); // Should OK
let q: number;
({ q } = numMapPoint); // Should error
~
!!! error TS2322: Type 'number | undefined' is not assignable to type 'number'.
!!! error TS2322: Type 'undefined' is not assignable to type 'number'.
}
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