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Parameter types not being inferred in a class method whose type is indexed from an interface
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**TypeScript Version:** 3.7.4
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
Index type
Parameter type of method
Inferring parameter types
**Code**
```ts
interface Parameters1 {
paramA: number;
paramB: string;
}
interface Parameters2 {
paramC: boolean;
}
interface SomeFunctions {
foo(options: Parameters1): void;
bar(options: Parameters2): void;
}
class AClass implements SomeFunctions {
public foo(options: Parameters1): void { }
public bar(options: Parameters2): void { }
}
const aClassInstance = new AClass();
function callMethod<K extends keyof SomeFunctions>(
methodName: K,
options: Parameters<SomeFunctions[K]>[0]
) {
// 1. Does not work:
// Argument of type 'Parameters<SomeFunctions[K]>[0]' is not assignable to parameter of type 'Parameters1 & Parameters2'.
aClassInstance[methodName](options);
// 2. Also does not work
// Argument of type 'Parameters<SomeFunctions[K]>[0]' is not assignable to parameter of type 'Parameters1 & Parameters2'.
// Type 'Parameters<SomeFunctions[K]>[0]' is not assignable to type 'Parameters1'.
(aClassInstance[methodName] as SomeFunctions[K])(options);
// 3. Does work, eve…
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