Follow one execution
Emits the source’s terminal failure cause and discards every successful value.
causesTick 0. Source: start.
Read this diagram
Follow each lane from left to right. Events stacked vertically share a tick; the green cursor marks the current time across every lane.
- A value
The text inside the pill is the emitted value. - Work starts
The raised chevron starts an inner run (^in the source). - The run returns
The vertical bar ends this lane’s run. - A cause is delivered
The exclamation mark belongs to this lane. - Work is interrupted
The cross marks cancellation of this run. - Current time
The line and diamond move together across all lanes. - Happening now
A highlighted event is at the current tick. - Still ahead
Muted, dashed values have not happened yet. - Time continues
The lane’s arrow is not a return marker. An empty stretch can be quiet work that is still running.
Illustrated ticks start at 0. At 1×, one illustrated tick takes one second; captions specify real durations when timing matters. A cause or interruption belongs to its lane, and other work may continue. Scroll horizontally to inspect the rest of a long timeline.
The source is subscribed once. Success values are dropped in arrival order; a terminal cause is emitted once and the returned Fx completes without a typed error. Defects and interruption are retained inside the emitted cause. No resource is acquired beyond the source subscription.
Import
import { causes } from "@typed/fx/Fx";Signatures
export declare const causes: <A, E, R>(fx: Fx<A, E, R>) => Fx<Cause.Cause<E>, never, R>;Why
Failure telemetry and supervision often need the complete Effect Cause
without treating that cause as another failure. Materializing only the
failure side makes those pipelines ordinary, infallible Fx values.
Ownership and lifetime
The source is subscribed once. Success values are dropped in arrival order; a terminal cause is emitted once and the returned Fx completes without a typed error. Defects and interruption are retained inside the emitted cause. No resource is acquired beyond the source subscription.
Examples
import { Cause } from "effect"
import { causes } from "@typed/fx/Fx"
import { failCause } from "@typed/fx/Fx"
const failures = causes(failCause(Cause.fail("offline")))Other public imports
These import paths expose the same declaration. Each page retains its own public name and signature.