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4.4 breaking change: no abstract property initialisers

Nathan Shively-Sanders 2021-05-20 07:18:08 -07:00
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Breaking-Changes.md

@ -2,6 +2,27 @@ These changes list where implementation differs between versions as the spec and
> For breaking changes to the compiler/services API, please check the [[API Breaking Changes]] page.
# TypeScript 4.4
## Abstract properties Do Not Allow Initializers
The following code is now an error because abstract properties may not have initializers:
```ts
abstract class C {
abstract prop = 1;
}
```
Instead, just give a type to the property:
```ts
abstract class C {
abstract prop: number;
}
```
# TypeScript 4.3
## Union Enums Cannot Be Compared to Arbitrary Numbers