Add check for delete expression must be optional (#37921)

* Add check for delete expression must be optional

* Add more tests

tests/cases/compiler/deleteExpressionMustBeOptional.ts

@@ -0,0 +1,42 @@
+// @strict: true, false
+
+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
+delete f.b
+delete f.c
+delete f.d
+delete f.e
+delete f.f
+delete f.g
+delete f.h
+delete f.i
+delete f.j
+
+delete a.a
+delete a.b
+
+delete b.a
+delete b.b