@zeix/cause-effect/index.js

Cause & Effect - reactive state management with signals.

var j=($)=>typeof $==="function",M=($,B)=>Object.prototype.toString.call($)===`[object ${B}]`,Y=($)=>$ instanceof Error?$:Error(String($));class F extends Error{constructor($){super(`Circular dependency in ${$} detected`);return this}}var y,N=new Set,U=0,k=new Map,D,f=()=>{D=void 0;let $=Array.from(k.values());k.clear();for(let B of $)B()},d=()=>{if(D)cancelAnimationFrame(D);D=requestAnimationFrame(f)};queueMicrotask(f);var I=($)=>{let B=new Set,W=$;return W.off=(z)=>{B.add(z)},W.cleanup=()=>{for(let z of B)z();B.clear()},W},O=($)=>{if(y&&!$.has(y)){let B=y;$.add(B),y.off(()=>{$.delete(B)})}},R=($)=>{for(let B of $)if(U)N.add(B);else B()},P=()=>{while(N.size){let $=Array.from(N);N.clear();for(let B of $)B()}},h=($)=>{U++;try{$()}finally{P(),U--}},q=($,B)=>{let W=y;y=B;try{$()}finally{y=W}},v=($,B)=>new Promise((W,z)=>{k.set(B||Symbol(),()=>{try{W($())}catch(G){z(G)}}),d()});var _="State",S=($)=>{let B=new Set,W=$,z={[Symbol.toStringTag]:_,get:()=>{return O(B),W},set:(G)=>{if(Object.is(W,G))return;if(W=G,R(B),J===W)B.clear()},update:(G)=>{z.set(G(W))}};return z},T=($)=>M($,_);var b="Computed",E=($)=>{let B=new Set,W=J,z,G,X=!0,K=!1,L=!1,x=(H)=>{if(!Object.is(H,W))W=H,K=!0;z=void 0,X=!1},C=()=>{K=J!==W,W=J,z=void 0},Z=(H)=>{let Q=Y(H);K=!z||Q.name!==z.name||Q.message!==z.message,W=J,z=Q},A=(H)=>(Q)=>{if(L=!1,G=void 0,H(Q),K)R(B)},V=I(()=>{if(X=!0,G?.abort("Aborted because source signal changed"),B.size)R(B);else V.cleanup()}),w=()=>q(()=>{if(L)throw new F("computed");if(K=!1,j($)&&$.constructor.name==="AsyncFunction"){if(G)return W;G=new AbortController,G.signal.addEventListener("abort",()=>{L=!1,G=void 0,w()},{once:!0})}let H;L=!0;try{H=G?$(G.signal):$()}catch(Q){if(Q instanceof DOMException&&Q.name==="AbortError")C();else Z(Q);L=!1;return}if(H instanceof Promise)H.then(A(x),A(Z));else if(H==null||J===H)C();else x(H);L=!1},V);return{[Symbol.toStringTag]:b,get:()=>{if(O(B),P(),X)w();if(z)throw z;return W}}},g=($)=>M($,b),m=($)=>j($)&&$.length<2;var J=Symbol(),p=($)=>T($)||g($),o=($)=>p($)?$:m($)?E($):S($);function s($){let{signals:B,ok:W,err:z=console.error,nil:G=()=>{}}=j($)?{signals:[],ok:$}:$,X=!1,K=I(()=>q(()=>{if(X)throw new F("effect");X=!0;let L=[],x=!1,C=B.map((A)=>{try{let V=A.get();if(V===J)x=!0;return V}catch(V){return L.push(Y(V)),J}}),Z=void 0;try{Z=x?G():L.length?z(...L):W(...C)}catch(A){Z=z(Y(A))}finally{if(j(Z))K.off(Z)}X=!1},K));return K(),()=>K.cleanup()}export{I as watch,o as toSignal,O as subscribe,S as state,q as observe,R as notify,T as isState,p as isSignal,j as isFunction,m as isComputedCallback,g as isComputed,P as flush,v as enqueue,s as effect,E as computed,h as batch,J as UNSET,_ as TYPE_STATE,b as TYPE_COMPUTED,F as CircularDependencyError};