Follow one execution
The thunk is evaluated anew for each run; this run reads 7.
syncTick 0. Subscription: 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.
Construction performs no work. Each run evaluates evaluate exactly once in the run’s fiber, emits its result, and completes after the Sink handles it. A thrown exception is an Effect defect; use Fx.fromEffect(Effect.try(...)) when failure is expected and belongs in the typed error channel.
Import
import { Fx } from "@typed/fx";Access Fx.sync through the imported Fx export. Its declaration below describes the member.
This public exposure is a re-export. Its import path is supported; declaration documentation is shared with the other public exposures below.
Signatures
export declare const sync: <A>(evaluate: () => A) => Fx<A>;Why
sync is the direct constructor for one value that must be computed at run time,
such as a fresh DOM node or a snapshot read from an imperative API. Unlike
succeed, it does not evaluate the function while the Fx is being assembled.
Ownership and lifetime
Construction performs no work. Each run evaluates evaluate exactly once in the
run’s fiber, emits its result, and completes after the Sink handles it. A thrown
exception is an Effect defect; use Fx.fromEffect(Effect.try(...)) when failure is
expected and belongs in the typed error channel.
Examples
import { Fx } from "@typed/fx"
const element = Fx.sync(() => document.createElement("div"))Other public imports
These import paths expose the same declaration. Each page retains its own public name and signature.