Typescript snippets #snippets #typescript

generic-keyinkeyof.ts

interface AppState {
    gender: Gender | null;
    age: number | null;
    height: number | null;
    weight: number | null;
    shouldSendResult: boolean;
    currentStep: number;
}
  

interface AppStateProvider {
    initialState: {
        [key in keyof AppState]?: AppState[key];
    };

key-in-enum.ts

// https://github.com/microsoft/TypeScript/issues/13042#issuecomment-393653843

enum Test {
    A = "a",
    B = "b"
}

type SomeType = {
    [x in Test]: () => void;
};

// Below does not work with interface, only type
interface SomeInterface {
    [x in Test]: () => void;
}

keyinkeyof.ts

// Keyof Generic interface

interface FormContext<Values = {}> {
    values: Values;
    touched: {
        [Key in keyof Values]: boolean;
    }
}