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strictFunctionTypes prevents an assignment not related to functions
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.3.0-dev.20181122
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
covariance, contravariance, keyof, interface, class, generic
**Code**
```ts
interface IBase {
foo: string;
}
interface IDerived extends IBase {
bar: string;
}
type StringPropertyNames<T> = { [P in keyof T]: T[P] extends string ? P : never }[keyof T]
type StringProperties<T> = Pick<T, StringPropertyNames<T>>
interface Foo<T> {
readonly Bar: StringProperties<T>;
}
let baseProperties: StringProperties<IBase>
let derivedProperties: StringProperties<IDerived>
let baseInterface: Foo<IBase>
let derivedInterface: Foo<IDerived>
baseProperties = derivedProperties // no error
baseInterface = derivedInterface
```
`tsc test.ts --strictFunctionTypes`
**Expected behavior:**
Compiles without errors.
**Actual behavior:**
```
test.ts:23:1 - error TS2322: Type 'Foo<IDerived>' is not assignable to type 'Foo<IBase>'.
Property 'bar' is missing in type 'IBase' but required in type 'IDerived'.
23 baseInterface = derivedInterface
~~~~~~~~~~~~~
test.ts:6:5
6 bar: string;
~~~
'bar' is declared here.
```
[**Playground Link:**](https://www.typescriptlang.org/play/#src=interface%20IBase%20%7B%0D%0A%20%20%20%20foo%3A%20string%3B%0D%0A%7D%0D%0A%0D%0Ainterface%20IDerived%20extends%20IBase%20%…
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