static.ts

class WebElement {
  public x: number;
  public y: number;
  // More code here
}

class EditorPaneElement {
  public static getHumanReadableCoordinates(element: WebElement) {
    return `[x:${element.x},y:${element.y}]`;
  }
  // More code here
}

class WebHelper {
  protected static parseInvalidJSON(invalidJSON): { [key: string]: any } {
    // Return "fixed" JSON.
    // Not used anywhere except this class.
    return {};
  }
  protected static getNetworkStatus(): boolean {
    // TRUE if online status is 100% guaranteed.
    // Not used anywhere except this class.
    // No need to be an instance method.
    return true;
  }
  // More code here
}

class CombineConfiguration {
  public static async getConfigFromYAML(uri: string | Buffer | URL): Promise<{ [key: string]: any }> {
    // Parse YAML
    return {};
  }
  public static async getConfigFromXML(uri: string | Buffer | URL): Promise<{ [key: string]: any }> {
    // Parse XML
    return {};
  }
  public static async getConfigFromJSON(uri: string | Buffer | URL): Promise<{ [key: string]: any }> {
    // Parse JSON
    return {};
  }
  public async getConfiguration(uris: string | Buffer | URL): Promise<Array<{ [key: string]: any }>> {
    // this.somethng();
    return [{}, {}];
  }
}