@idpass/data-collect-core / NetworkSimulator
Class: NetworkSimulator
Defined in: testing/NetworkSimulator.ts:54
Simulates unreliable network conditions for testing.
Wraps fetch or Express middleware to inject latency, failures, and truncated responses. Useful for testing retry logic, timeout handling, and graceful degradation in sync code.
Constructors
Constructor
new NetworkSimulator(
condition?):NetworkSimulator
Defined in: testing/NetworkSimulator.ts:60
Parameters
condition?
Returns
NetworkSimulator
Methods
setCondition()
setCondition(
condition):void
Defined in: testing/NetworkSimulator.ts:69
Replace the current network condition.
Parameters
condition
Returns
void
reset()
reset():
void
Defined in: testing/NetworkSimulator.ts:76
Reset all counters and clear conditions.
Returns
void
wrapFetch()
wrapFetch(
originalFetch): {(input,init?):Promise<Response>; (input,init?):Promise<Response>; }
Defined in: testing/NetworkSimulator.ts:86
Returns a wrapped version of fetch that applies the configured network conditions.
Parameters
originalFetch
{(input, init?): Promise<Response>; (input, init?): Promise<Response>; }
Returns
(
input,init?):Promise<Response>
Parameters
input
RequestInfo | URL
init?
RequestInit
Returns
Promise<Response>
(
input,init?):Promise<Response>
Parameters
input
string | Request | URL
init?
RequestInit
Returns
Promise<Response>
createMiddleware()
createMiddleware(): (
req,res,next) =>void
Defined in: testing/NetworkSimulator.ts:145
Creates Express middleware that applies the configured network conditions.
The middleware intercepts requests and can add latency, return error status codes, or pass through to the next handler.
Returns
(req, res, next) => void
getStats()
getStats():
NetworkStats
Defined in: testing/NetworkSimulator.ts:191
Returns statistics about the simulator's activity.