HLTech / judge-d-ui

/**

 * Return object which is a shallow merge of 'target' and 'source'. Written manually bacause:

 * - {...target, ...source} does not work with generic types (https://github.com/Microsoft/TypeScript/issues/22687)

 * - Object.assign does not work in IE <= 11

 */

function merge<T extends {}, U extends {}>(target: T, source: U): T & U {

    const newObj = Object.create(target);

    for (const key in source) {

        if (source.hasOwnProperty(key)) {

            newObj[key] = source[key];

        }

    }

    return newObj;

}

/**

 * Simple config class that allows to retrieve and overwrite application config set by environment in window.__config__

 */

export class AppConfig<T extends {}> {

    private config: T;

    public constructor() {

        // @ts-ignore

        this.config = window['__config__'] || {};

    }

    public get<K extends keyof T>(key: K): T[K] {

        return this.config[key];

    }

    public set(setConfig: Partial<T>): void {

        this.config = merge(this.config, setConfig);

    }

}

export const config = new AppConfig<{

    BASE_PATH: string;

}>();