class CustomError extends Error {

constructor(message?: string) {

super(message)

// see: typescriptlang.org/docs/handbook/release-notes/typescript-2-2.html

Object.setPrototypeOf(this, new.target.prototype) // restore prototype chain

this.name = new.target.name // stack traces display correctly now

}

}

export class UnauthorizedError extends CustomError {}

export class CrossOriginForbiddenError extends CustomError {}

export class SameOriginForbiddenError extends CustomError {}

export class NotFoundError extends CustomError {}

export class NotEditableError extends CustomError { }

export class WebOperationError extends CustomError {}

export class FetchError extends CustomError {

status: number

constructor(status: number, message?: string) {

super(message)

this.status = status

}

}