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source dump of claude code forked from oppi.li/claude-code
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1.4 kB · 43 lines
TypeScript
at main
1234567891011121314151617181920212223242526272829303132333435363738394041424344/** * Tiny listener-set primitive for pure event signals (no stored state). * * Collapses the ~8-line `const listeners = new Set(); function subscribe(){…}; * function notify(){for(const l of listeners) l()}` boilerplate that was * duplicated ~15× across the codebase into a one-liner. * * Distinct from a store (AppState, createStore) — there is no snapshot, no * getState. Use this when subscribers only need to know "something happened", * optionally with event args, not "what is the current value". * * Usage: * const changed = createSignal<[SettingSource]>() * export const subscribe = changed.subscribe * // later: changed.emit('userSettings') */
export type Signal<Args extends unknown[] = []> = { /** Subscribe a listener. Returns an unsubscribe function. */ subscribe: (listener: (...args: Args) => void) => () => void /** Call all subscribed listeners with the given arguments. */ emit: (...args: Args) => void /** Remove all listeners. Useful in dispose/reset paths. */ clear: () => void}
export function createSignal<Args extends unknown[] = []>(): Signal<Args> { const listeners = new Set<(...args: Args) => void>() return { subscribe(listener) { listeners.add(listener) return () => { listeners.delete(listener) } }, emit(...args) { for (const listener of listeners) listener(...args) }, clear() { listeners.clear() }, }}