@larner.dev/emailer v1.2.0

http-response-helpers

In this module:

• Error classes for each 4xx and 5xx http status code.
• An HTTP redirect class that can be returned to inform your router to redirect somewhere
• Type guard helper classes to determine if an unknown variable is an HTTP error or HTTP redirect.

Usage

function route() {
    throw new HTTPError.BadRequest('INVALID_EMAIL', { email: '@bademail' });
}

try {
    const result = route();
    if(isHTTPRedirect(result)) {
        // redirect to result.location with status result.status
    }
    else {
        // do something else
    }
}
catch(error) {
    if(isHTTPError(error)) {
        console.log('got an http error');
    }
}

Helper Classes

isHTTPError(maybeHTTPError: unknown, code?: HTTPErrorCode): : maybeHTTPError is HTTPError

Returns true if maybeHTTPError is a valid HTTPError and provides a type guard to that effect.

• maybeHTTPError: any variable that you want to confirm is a HTTPError or not.
• code: optional HTTPErrorCode (4xx or 5xx). If this parameter is specified then the function will only return true if maybeHTTPError is an HTTPError and matches the specified code.

isHTTPRedirect(maybeHTTPRedirect: unknown, status?: HTTPRedirect): : maybeHTTPRedirect is HTTPRedirect

Returns true if maybeHTTPRedirect is a valid HTTPRedirect and provides a type guard to that effect.

• maybeHTTPRedirect: any variable that you want to confirm is a HTTPRedirect or not.
• status: optional number (3xx). If this parameter is specified then the function will only return true if maybeHTTPRedirect is an HTTPRedirect with a status that matches the specified status.

HTTPRedirect

new HTTPRedirect(location: string, status: number = 302);

The HTTPRedirect object is a special object you can return from your routes that notifies the server to redirect to a specific location with the specified redirect status code.

• location: a string that specifies where you should be redirected to.
• status: optional number (default 302). If this parameter is specified then the function will only return true if maybeHTTPRedirect is an HTTPRedirect with a status that matches the specified status.

HTTPError

new HTTPError.BadRequest(message: string, params: Jsonifiable = null)

The HTTPError object is a special object you can return from your routes that notifies the server which type of error should be returned fro the route.

• message: a string that specifies which message (in addition to the error code) should be returned with the error.
• params: optional JSON object. This is a way to pass additional information back with the error apart from the error code and message.

Supported classes

• HTTPError.BadRequest
• HTTPError.Unauthorized
• HTTPError.PaymentRequired
• HTTPError.Forbidden
• HTTPError.NotFound
• HTTPError.MethodNotAllowed
• HTTPError.NotAcceptable
• HTTPError.ProxyAuthenticationRequired
• HTTPError.RequestTimeout
• HTTPError.Conflict
• HTTPError.Gone
• HTTPError.LengthRequired
• HTTPError.PreconditionFailed
• HTTPError.PayloadTooLarge
• HTTPError.URITooLong
• HTTPError.UnsupportedMediaType
• HTTPError.RangeNotSatisfiable
• HTTPError.ExpectationFailed
• HTTPError.MisdirectedRequest
• HTTPError.UnprocessableEntity
• HTTPError.Locked
• HTTPError.FailedDependency
• HTTPError.TooEarly
• HTTPError.UpgradeRequired
• HTTPError.PreconditionRequired
• HTTPError.TooManyRequests
• HTTPError.RequestHeaderFieldsTooLarge
• HTTPError.UnavailableForLegalReasons
• HTTPError.InternalServerError
• HTTPError.NotImplemented
• HTTPError.BadGateway
• HTTPError.ServiceUnavailable
• HTTPError.GatewayTimeout
• HTTPError.HTTPVersionNotSupported
• HTTPError.VariantAlsoNegotiates
• HTTPError.InsufficientStorage
• HTTPError.LoopDetected
• HTTPError.NotExtended
• HTTPError.NetworkAuthenticationRequired