I am facing an issue with a class in my project:
// some npm module
export class User {
fname: string;
lname: string;
}
Unfortunately, I cannot modify the declaration of this class from my project root since it is an npm module. I wish to add a new index signature to this class but have been unsuccessful! I attempted the following code, but it did not yield the desired result!
// file.d.ts
export declare class User {
customProperty: any;
}
No need to export the `declaration`, simply ensure that your `file.d.ts` includes something similar to this snippet, using `axios` as an example:
declare module "axios" {
interface AxiosRequestConfig {
customProperty: "some-type";
}
interface AxiosInstance {
request<T = any>(config: AxiosRequestConfig): Promise<T>;
get<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>;
delete<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>;
head<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>;
options<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>;
post<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T>;
put<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T>;
patch<T = any>(url: string, data?: any, config?: AxiosRequestConfig): Promise<T>;
}
}
To learn more about module augmentation in typescript, check out the documentation: here
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