How can I specify the type of a property in Typescript?

Looking for a solution:

type WithRequiredProperty<Type, Key extends keyof Type> = Omit<Type, Key> & {
    [Property in Key]-?: Type[Property];
};

export type MessageWithMdEnforced = WithRequiredProperty<IMessage, 'md'>;

export interface IMessage extends IClass {
    rid: RoomID;
    msg: string;
    tmid?: string;
    tshow?: boolean;
    ts: Date;
}

Encountering an issue where IMessage is imported from node_modules and cannot be modified directly. Desiring to include errorReason: string in the IMessage interface.

Seeking advice on how to proceed and achieve the desired outcome. Any suggestions?

typescripttypesinterface

Answer №1

To ensure that the properties are inherited to a new interface, you can simply create a new interface that extends the existing IMessage. This way, your new interface will inherit all the properties from IMessage and you can then use this new interface in your code.

type WithMandatoryProperty<Type, Key extends keyof Type> = Omit<Type, Key> & {
    [Property in Key]-?: Type[Property];
};

interface CustomMessage extends IMessage {
    description?: string;
} 

export type MessageWithEnforcedMd = WithMandatoryProperty<CustomMessage, 'md'>;

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