1141     on(type: 'progress', callback: (receivedSize: number, totalSize: number) => void): void;  method
1219     on(type: 'complete' | 'pause' | 'remove', callback: () => void): void;  method
1291     on(type: 'fail', callback: (err: number) => void): void;  method
2160     on(type: 'progress', callback: (uploadedSize: number, totalSize: number) => void): void;  method
2232     on(type: 'headerReceive', callback: (header: object) => void): void;  method
2301     on(type: 'complete' | 'fail', callback: Callback<Array<TaskState>>): void;  method
4402       on(event: 'progress', callback: (progress: Progress) => void): void;  method
4450       on(event: 'completed', callback: (progress: Progress) => void): void;  method
4498       on(event: 'failed', callback: (progress: Progress) => void): void;  method
4533       on(event: 'pause', callback: (progress: Progress) => void): void;  method
4555       on(event: 'resume', callback: (progress: Progress) => void): void;  method
4577       on(event: 'remove', callback: (progress: Progress) => void): void;  method
4600       on(event: 'response', callback: Callback<HttpResponse>): void;  method