1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
tests/cases/compiler/deleteExpressionMustBeOptional.ts(25,8): error TS2790: The operand of a 'delete' operator must be optional.
tests/cases/compiler/deleteExpressionMustBeOptional.ts(27,8): error TS2790: The operand of a 'delete' operator must be optional.
tests/cases/compiler/deleteExpressionMustBeOptional.ts(34,10): error TS2339: Property 'j' does not exist on type 'Foo'.
==== tests/cases/compiler/deleteExpressionMustBeOptional.ts (3 errors) ====
interface Foo {
a: number
b: number | undefined
c: number | null
d?: number
e: number | undefined | null
f?: number | undefined | null
g: unknown
h: any
i: never
}
interface AA {
[s: string]: number
}
type BB = {
[P in keyof any]: number
}
declare const f: Foo
declare const a: AA
declare const b: BB
delete f.a
~~~
!!! error TS2790: The operand of a 'delete' operator must be optional.
delete f.b
delete f.c
~~~
!!! error TS2790: The operand of a 'delete' operator must be optional.
delete f.d
delete f.e
delete f.f
delete f.g
delete f.h
delete f.i
delete f.j
~
!!! error TS2339: Property 'j' does not exist on type 'Foo'.
delete a.a
delete a.b
delete b.a
delete b.b
|
