S.attribute is the best option

dist/dde-with-signals.js

@@ -1,24 +1,25 @@
 //deka-dom-el library is available via global namespace `dde`
 (()=> {
-var y={isSignal(t){return!1},processReactiveAttribute(t,e,n,r){return n}};function $(t,e=!0){return e?Object.assign(y,t):(Object.setPrototypeOf(t,y),t)}function R(t){return y.isPrototypeOf(t)&&t!==y?t:y}function x(t){return typeof t>"u"}function q(t){let e=typeof t;return e!=="object"?e:t===null?"null":Object.prototype.toString.call(t)}function C(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var M={setDeleteAttr:Y,ssr:""};function Y(t,e,n){if(Reflect.set(t,e,n),!!x(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var E=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],m={get current(){return E[E.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...E]},push(t={}){return E.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return E.push(E[0])},pop(){if(E.length!==1)return E.pop()}};function B(...t){return this.appendOriginal(...t),this}function tt(t){return t.append===B||(t.appendOriginal=t.append,t.append=B),t}var N;function S(t,e,...n){let r=R(this),o=0,c,s;switch((Object(e)!==e||r.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,m.push({scope:t,host:(...p)=>p.length?(o===1?n.unshift(...p):p.forEach(v=>v(s)),void 0):s}),c=t(e||void 0);let a=c instanceof DocumentFragment;if(c.nodeName==="#comment")break;let d=S.mark({type:"component",name:t.name,host:a?"this":"parentElement"});c.prepend(d),a&&(s=d);break}case t==="#text":c=j.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):c=j.call(this,document.createDocumentFragment(),e);break;case!!N:c=j.call(this,document.createElementNS(N,t),e);break;case!c:c=j.call(this,document.createElement(t),e)}return tt(c),s||(s=c),n.forEach(a=>a(s)),o&&m.pop(),o=2,c}S.mark=function(t,e=!1){t=Object.entries(t).map(([o,c])=>o+`="${c}"`).join(" ");let n=e?"":"/",r=document.createComment(`<dde:mark ${t}${M.ssr}${n}>`);return e||(r.end=document.createComment("</dde:mark>")),r};function _t(t){let e=this;return function(...r){N=t;let o=S.call(e,...r);return N=void 0,o}}var{setDeleteAttr:I}=M,L=new WeakMap;function j(t,...e){if(!e.length)return t;L.set(t,G(t,this));for(let[n,r]of Object.entries(Object.assign({},...e)))Z.call(this,t,n,r);return L.delete(t),t}function Z(t,e,n){let{setRemoveAttr:r,s:o}=G(t,this),c=this;n=o.processReactiveAttribute(t,e,n,(a,d)=>Z.call(c,t,a,d));let[s]=e;if(s==="=")return r(e.slice(1),n);if(s===".")return J(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),r(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return r(e,n,"http://www.w3.org/1999/xlink");case"textContent":return I(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return T(o,n,J.bind(null,t[e]));case"ariaset":return T(o,n,(a,d)=>r("aria-"+a,d));case"classList":return et.call(c,t,n)}return nt(t,e)?I(t,e,n):r(e,n)}function G(t,e){if(L.has(t))return L.get(t);let r=(t instanceof SVGElement?ot:rt).bind(null,t,"Attribute"),o=R(e);return{setRemoveAttr:r,s:o}}function et(t,e){let n=R(this);return T(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function Et(t){return Array.from(t.children).forEach(e=>e.remove()),t}function nt(t,e){if(!Reflect.has(t,e))return!1;let n=H(t,e);return!x(n.set)}function H(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||H(t,e)}function T(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,c]){o&&(c=t.processReactiveAttribute(e,o,c,n),n(o,c))})}function V(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function rt(t,e,n,r){return t[(x(r)?"remove":"set")+e](n,V(r))}function ot(t,e,n,r,o=null){return t[(x(r)?"remove":"set")+e+"NS"](o,n,V(r))}function J(t,e,n){if(Reflect.set(t,e,n),!!x(n))return Reflect.deleteProperty(t,e)}function wt(t,e,n){return e||(e={}),function(o,...c){n&&(c.unshift(o),o=typeof n=="function"?n():n);let s=c.length?new CustomEvent(t,Object.assign({detail:c[0]},e)):new Event(t,e);return o.dispatchEvent(s)}}function _(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var P=st(),ct=new WeakSet;_.connected=function(t,e){let{custom_element:n}=m.current,r="connected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c.__dde_lifecycleToEvents?c:c.isConnected?(c.dispatchEvent(new Event(s)),c):(C(e.signal,()=>P.offConnected(c,t))&&P.onConnected(c,t),c)}};_.disconnected=function(t,e){let{custom_element:n}=m.current,r="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c.__dde_lifecycleToEvents||C(e.signal,()=>P.offDisconnected(c,t))&&P.onDisconnecLine truncated
-* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,p=t[A][a];if(p)return p(d)})(t),_.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
-* Investigate `__dde_attributes` key of the element.*/g.clear(...Object.values(t[A]))})(t));let r=t[A],o=Reflect.has(r,e)?Reflect.get(r,e):r[e]=g(n);return new Proxy(o,{apply(c,s,a){if(!a.length)return c();let d=a[0];return t.setAttribute(e,d)}})};var Q={isSignal:D,processReactiveAttribute(t,e,n,r){if(!D(n))return n;let o=c=>r(e,c);return U(n,o),X(n,o,t,e),n()}};function X(t,e,...n){let{current:r}=m;r.prevent||r.host(function(o){o[k]||(o[k]=[],_.disconnected(()=>o[k].forEach(([[c,s]])=>O(c,s,c[l]?.host()===o)))(o)),o[k].push([[t,e],...n])})}function K(t,e){let n=(...r)=>r.length?dt(n,...r):at(n);return ft(n,t,e)}var it=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),F=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
-`),r=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(o=>!o.includes(r))}};function ft(t,e,n){let r=[];q(n)!=="[object Object]"&&(n={});let{onclear:o}=g.symbols;n[o]&&(r.push(n[o]),Reflect.deleteProperty(n,o));let{host:c}=m;return Reflect.defineProperty(t,l,{value:{value:e,actions:n,onclear:r,host:c,listeners:new Set,defined:new F},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[l],it),t}function ut(){return W[W.length-1]}function at(t){if(!t[l])return;let{value:e,listeners:n}=t[l],r=ut();return r&&n.add(r),h.has(r)&&h.get(r).add(t),e}function dt(t,e,n){if(!t[l])return;let r=t[l];if(!(!n&&r.value===e))return r.value=e,r.listeners.forEach(o=>o(e)),e}function U(t,e){if(t[l])return t[l].listeners.add(e)}function O(t,e,n){let r=t[l];if(!r)return;let o=r.listeners.delete(e);if(n&&!r.listeners.size){if(g.clear(t),!h.has(r))return o;let c=h.get(r);if(!h.has(c))return o;h.get(c).forEach(s=>O(s,c,!0))}return o}$(Q);
-globalThis.dde= {S: g,
+var y={isSignal(t){return!1},processReactiveAttribute(t,e,n,r){return n}};function T(t,e=!0){return e?Object.assign(y,t):(Object.setPrototypeOf(t,y),t)}function C(t){return y.isPrototypeOf(t)&&t!==y?t:y}function x(t){return typeof t>"u"}function B(t){let e=typeof t;return e!=="object"?e:t===null?"null":Object.prototype.toString.call(t)}function N(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var $={setDeleteAttr:tt,ssr:""};function tt(t,e,n){if(Reflect.set(t,e,n),!!x(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var E=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],g={get current(){return E[E.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...E]},push(t={}){return E.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return E.push(E[0])},pop(){if(E.length!==1)return E.pop()}};function H(...t){return this.appendOriginal(...t),this}function et(t){return t.append===H||(t.appendOriginal=t.append,t.append=H),t}var L;function S(t,e,...n){let r=C(this),o=0,c,s;switch((Object(e)!==e||r.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,g.push({scope:t,host:(...p)=>p.length?(o===1?n.unshift(...p):p.forEach(v=>v(s)),void 0):s}),c=t(e||void 0);let a=c instanceof DocumentFragment;if(c.nodeName==="#comment")break;let d=S.mark({type:"component",name:t.name,host:a?"this":"parentElement"});c.prepend(d),a&&(s=d);break}case t==="#text":c=j.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):c=j.call(this,document.createDocumentFragment(),e);break;case!!L:c=j.call(this,document.createElementNS(L,t),e);break;case!c:c=j.call(this,document.createElement(t),e)}return et(c),s||(s=c),n.forEach(a=>a(s)),o&&g.pop(),o=2,c}S.mark=function(t,e=!1){t=Object.entries(t).map(([o,c])=>o+`="${c}"`).join(" ");let n=e?"":"/",r=document.createComment(`<dde:mark ${t}${$.ssr}${n}>`);return e||(r.end=document.createComment("</dde:mark>")),r};function Et(t){let e=this;return function(...r){L=t;let o=S.call(e,...r);return L=void 0,o}}var{setDeleteAttr:I}=$,P=new WeakMap;function j(t,...e){if(!e.length)return t;P.set(t,G(t,this));for(let[n,r]of Object.entries(Object.assign({},...e)))Z.call(this,t,n,r);return P.delete(t),t}function Z(t,e,n){let{setRemoveAttr:r,s:o}=G(t,this),c=this;n=o.processReactiveAttribute(t,e,n,(a,d)=>Z.call(c,t,a,d));let[s]=e;if(s==="=")return r(e.slice(1),n);if(s===".")return J(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),r(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return r(e,n,"http://www.w3.org/1999/xlink");case"textContent":return I(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return z(o,n,J.bind(null,t[e]));case"ariaset":return z(o,n,(a,d)=>r("aria-"+a,d));case"classList":return nt.call(c,t,n)}return rt(t,e)?I(t,e,n):r(e,n)}function G(t,e){if(P.has(t))return P.get(t);let r=(t instanceof SVGElement?ct:ot).bind(null,t,"Attribute"),o=C(e);return{setRemoveAttr:r,s:o}}function nt(t,e){let n=C(this);return z(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function vt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function A(t,e,n,r){return t instanceof HTMLElement?t[e+"Attribute"](n,r):t[e+"AttributeNS"](null,n,r)}function rt(t,e){if(!Reflect.has(t,e))return!1;let n=V(t,e);return!x(n.set)}function V(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||V(t,e)}function z(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,c]){o&&(c=t.processReactiveAttribute(e,o,c,n),n(o,c))})}function K(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function ot(t,e,n,r){return t[(x(r)?"remove":"set")+e](n,K(r))}function ct(t,e,n,r,o=null){return t[(x(r)?"remove":"set")+e+"NS"](o,n,K(r))}function J(t,e,n){if(Reflect.set(t,e,n),!!x(n))return Reflect.deleteProperty(t,e)}function yt(t,e,n){return e||(e={}),function(o,...c){n&&(c.unshift(o),o=typeof n=="function"?n():n);let s=c.length?new CustomEvent(t,Object.assign({detail:c[0]},e)):new Event(t,e);return o.dispatchEvent(s)}}function _(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var k=it(),st=new WeakSet;_.connected=function(t,e){let{custom_element:n}=g.current,r="connected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c.__dde_lifecycleToEvents?c:c.isConnected?(c.dispatchEvent(new Event(s)),c):(N(e.signal,()=>k.offConnected(c,t))&&k.onConnected(c,t),c)}};_.disconnected=function(t,e){let{custom_element:n}=g.current,r="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return cLine truncated
+* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,p=r[O][a];if(p)return p(d)})(r),_.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/b.clear(...Object.values(r[O]))})(r)}),new Proxy(n,{apply(o,c,s){if(!s.length)return o();let a=s[0];return A(r,"set",t,a)}})};var X={isSignal:W,processReactiveAttribute(t,e,n,r){if(!W(n))return n;let o=c=>r(e,c);return q(n,o),Y(n,o,t,e),n()}};function Y(t,e,...n){let{current:r}=g;r.prevent||r.host(function(o){o[D]||(o[D]=[],_.disconnected(()=>o[D].forEach(([[c,s]])=>R(c,s,c[l]?.host()===o)))(o)),o[D].push([[t,e],...n])})}function Q(t,e){let n=(...r)=>r.length?lt(n,...r):dt(n);return ft(n,t,e)}var ut=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),U=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
+`),r=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(o=>!o.includes(r))}};function ft(t,e,n){let r=[];B(n)!=="[object Object]"&&(n={});let{onclear:o}=b.symbols;n[o]&&(r.push(n[o]),Reflect.deleteProperty(n,o));let{host:c}=g;return Reflect.defineProperty(t,l,{value:{value:e,actions:n,onclear:r,host:c,listeners:new Set,defined:new U},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[l],ut),t}function at(){return M[M.length-1]}function dt(t){if(!t[l])return;let{value:e,listeners:n}=t[l],r=at();return r&&n.add(r),h.has(r)&&h.get(r).add(t),e}function lt(t,e,n){if(!t[l])return;let r=t[l];if(!(!n&&r.value===e))return r.value=e,r.listeners.forEach(o=>o(e)),e}function q(t,e){if(t[l])return t[l].listeners.add(e)}function R(t,e,n){let r=t[l];if(!r)return;let o=r.listeners.delete(e);if(n&&!r.listeners.size){if(b.clear(t),!h.has(r))return o;let c=h.get(r);if(!h.has(c))return o;h.get(c).forEach(s=>R(s,c,!0))}return o}T(X);
+globalThis.dde= {S: b,
 assign: j,
 assignAttribute: Z,
-chainableAppend: tt,
-classListDeclarative: et,
+chainableAppend: et,
+classListDeclarative: nt,
 createElement: S,
-createElementNS: _t,
-dispatchEvent: wt,
+createElementNS: Et,
+dispatchEvent: yt,
 el: S,
-elNS: _t,
-empty: Et,
-isSignal: D,
+elNS: Et,
+elementAttribute: A,
+empty: vt,
+isSignal: W,
 on: _,
-registerReactivity: $,
-scope: m
+registerReactivity: T,
+scope: g
 };
 
 })();

dist/dde.js

@@ -1,19 +1,20 @@
 //deka-dom-el library is available via global namespace `dde`
 (()=> {
-var v={isSignal(t){return!1},processReactiveAttribute(t,e,n,c){return n}};function U(t,e=!0){return e?Object.assign(v,t):(Object.setPrototypeOf(t,v),t)}function x(t){return v.isPrototypeOf(t)&&t!==v?t:v}function b(t){return typeof t>"u"}function A(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var S={setDeleteAttr:k,ssr:""};function k(t,e,n){if(Reflect.set(t,e,n),!!b(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var l=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],E={get current(){return l[l.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...l]},push(t={}){return 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n!="object")break;case"dataset":return y(o,n,P.bind(null,t[e]));case"ariaset":return y(o,n,(d,a)=>c("aria-"+d,a));case"classList":return z.call(r,t,n)}return B(t,e)?j(t,e,n):c(e,n)}function M(t,e){if(C.has(t))return C.get(t);let c=(t instanceof SVGElement?I:F).bind(null,t,"Attribute"),o=x(e);return{setRemoveAttr:c,s:o}}function z(t,e){let n=x(this);return y(n,e,(c,o)=>t.classList.toggle(c,o===-1?void 0:!!o)),t}function tt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function B(t,e){if(!Reflect.has(t,e))return!1;let n=T(t,e);return!b(n.set)}function T(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||T(t,e)}function y(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,r]){o&&(r=t.processReactiveAttribute(e,o,r,n),n(o,r))})}function $(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function F(t,e,n,c){return t[(b(c)?"remove":"set")+e](n,$(c))}function I(t,e,n,c,o=null){return 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 globalThis.dde= {assign: w,
-assignAttribute: W,
-chainableAppend: q,
-classListDeclarative: z,
+assignAttribute: M,
+chainableAppend: z,
+classListDeclarative: B,
 createElement: N,
 createElementNS: Y,
-dispatchEvent: rt,
+dispatchEvent: ot,
 el: N,
 elNS: Y,
+elementAttribute: et,
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+scope: v
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 })();

dist/esm-with-signals.d.ts

@@ -521,7 +521,7 @@ interface S {
 	 * */
 	el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[]): DocumentFragment;
 
-    fromAttribute<T>(element: HTMLElement, name: string, value?: T): Signal<T, {}>;
+    attribute(name: string, initial?: string): Signal<string, {}>;
 }
 export const S: S;
 declare global {

dist/esm-with-signals.js

@@ -1,4 +1,4 @@
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n!="object")break;case"dataset":return T(o,n,J.bind(null,t[e]));case"ariaset":return T(o,n,(a,d)=>r("aria-"+a,d));case"classList":return et.call(c,t,n)}return nt(t,e)?I(t,e,n):r(e,n)}function G(t,e){if(L.has(t))return L.get(t);let r=(t instanceof SVGElement?ot:rt).bind(null,t,"Attribute"),o=R(e);return{setRemoveAttr:r,s:o}}function et(t,e){let n=R(this);return T(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function Et(t){return Array.from(t.children).forEach(e=>e.remove()),t}function nt(t,e){if(!Reflect.has(t,e))return!1;let n=H(t,e);return!x(n.set)}function H(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||H(t,e)}function T(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,c]){o&&(c=t.processReactiveAttribute(e,o,c,n),n(o,c))})}function V(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function rt(t,e,n,r){return t[(x(r)?"remove":"set")+e](n,V(r))}function 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c.addEventListener(s,t,e),c.__dde_lifecycleToEvents||C(e.signal,()=>P.offDisconnected(c,t))&&P.onDisconnecLine truncated
-* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,p=t[A][a];if(p)return p(d)})(t),_.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
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+var y={isSignal(t){return!1},processReactiveAttribute(t,e,n,r){return n}};function T(t,e=!0){return e?Object.assign(y,t):(Object.setPrototypeOf(t,y),t)}function C(t){return y.isPrototypeOf(t)&&t!==y?t:y}function x(t){return typeof t>"u"}function B(t){let e=typeof t;return e!=="object"?e:t===null?"null":Object.prototype.toString.call(t)}function N(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var $={setDeleteAttr:tt,ssr:""};function tt(t,e,n){if(Reflect.set(t,e,n),!!x(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var E=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],g={get current(){return E[E.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...E]},push(t={}){return E.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return E.push(E[0])},pop(){if(E.length!==1)return E.pop()}};function H(...t){return this.appendOriginal(...t),this}function et(t){return t.append===H||(t.appendOriginal=t.append,t.append=H),t}var L;function S(t,e,...n){let r=C(this),o=0,c,s;switch((Object(e)!==e||r.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,g.push({scope:t,host:(...p)=>p.length?(o===1?n.unshift(...p):p.forEach(v=>v(s)),void 0):s}),c=t(e||void 0);let a=c instanceof DocumentFragment;if(c.nodeName==="#comment")break;let d=S.mark({type:"component",name:t.name,host:a?"this":"parentElement"});c.prepend(d),a&&(s=d);break}case t==="#text":c=j.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):c=j.call(this,document.createDocumentFragment(),e);break;case!!L:c=j.call(this,document.createElementNS(L,t),e);break;case!c:c=j.call(this,document.createElement(t),e)}return et(c),s||(s=c),n.forEach(a=>a(s)),o&&g.pop(),o=2,c}S.mark=function(t,e=!1){t=Object.entries(t).map(([o,c])=>o+`="${c}"`).join(" ");let n=e?"":"/",r=document.createComment(`<dde:mark ${t}${$.ssr}${n}>`);return e||(r.end=document.createComment("</dde:mark>")),r};function Et(t){let e=this;return function(...r){L=t;let o=S.call(e,...r);return L=void 0,o}}var{setDeleteAttr:I}=$,P=new WeakMap;function j(t,...e){if(!e.length)return t;P.set(t,G(t,this));for(let[n,r]of Object.entries(Object.assign({},...e)))Z.call(this,t,n,r);return P.delete(t),t}function Z(t,e,n){let{setRemoveAttr:r,s:o}=G(t,this),c=this;n=o.processReactiveAttribute(t,e,n,(a,d)=>Z.call(c,t,a,d));let[s]=e;if(s==="=")return r(e.slice(1),n);if(s===".")return J(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),r(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return r(e,n,"http://www.w3.org/1999/xlink");case"textContent":return I(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return z(o,n,J.bind(null,t[e]));case"ariaset":return z(o,n,(a,d)=>r("aria-"+a,d));case"classList":return nt.call(c,t,n)}return rt(t,e)?I(t,e,n):r(e,n)}function G(t,e){if(P.has(t))return P.get(t);let r=(t instanceof SVGElement?ct:ot).bind(null,t,"Attribute"),o=C(e);return{setRemoveAttr:r,s:o}}function nt(t,e){let n=C(this);return z(n,e,(r,o)=>t.classList.toggle(r,o===-1?void 0:!!o)),t}function vt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function A(t,e,n,r){return t instanceof HTMLElement?t[e+"Attribute"](n,r):t[e+"AttributeNS"](null,n,r)}function rt(t,e){if(!Reflect.has(t,e))return!1;let n=V(t,e);return!x(n.set)}function V(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||V(t,e)}function z(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,c]){o&&(c=t.processReactiveAttribute(e,o,c,n),n(o,c))})}function K(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function ot(t,e,n,r){return t[(x(r)?"remove":"set")+e](n,K(r))}function ct(t,e,n,r,o=null){return t[(x(r)?"remove":"set")+e+"NS"](o,n,K(r))}function J(t,e,n){if(Reflect.set(t,e,n),!!x(n))return Reflect.deleteProperty(t,e)}function yt(t,e,n){return e||(e={}),function(o,...c){n&&(c.unshift(o),o=typeof n=="function"?n():n);let s=c.length?new CustomEvent(t,Object.assign({detail:c[0]},e)):new Event(t,e);return o.dispatchEvent(s)}}function _(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var k=it(),st=new WeakSet;_.connected=function(t,e){let{custom_element:n}=g.current,r="connected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return c.addEventListener(s,t,e),c.__dde_lifecycleToEvents?c:c.isConnected?(c.dispatchEvent(new Event(s)),c):(N(e.signal,()=>k.offConnected(c,t))&&k.onConnected(c,t),c)}};_.disconnected=function(t,e){let{custom_element:n}=g.current,r="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(c){n&&(c=n);let s="dde:"+r;return cLine truncated
+* Investigate `__dde_attributes` key of the element.*/let[a,d]=s,p=r[O][a];if(p)return p(d)})(r),_.disconnected(function(){/*! This removes all signals mapped to attributes (`S.attribute`).
+* Investigate `__dde_attributes` key of the element.*/b.clear(...Object.values(r[O]))})(r)}),new Proxy(n,{apply(o,c,s){if(!s.length)return o();let a=s[0];return A(r,"set",t,a)}})};var X={isSignal:W,processReactiveAttribute(t,e,n,r){if(!W(n))return n;let o=c=>r(e,c);return q(n,o),Y(n,o,t,e),n()}};function Y(t,e,...n){let{current:r}=g;r.prevent||r.host(function(o){o[D]||(o[D]=[],_.disconnected(()=>o[D].forEach(([[c,s]])=>R(c,s,c[l]?.host()===o)))(o)),o[D].push([[t,e],...n])})}function Q(t,e){let n=(...r)=>r.length?lt(n,...r):dt(n);return ft(n,t,e)}var ut=Object.assign(Object.create(null),{stopPropagation(){this.skip=!0}}),U=class extends Error{constructor(){super();let[e,...n]=this.stack.split(`
+`),r=e.slice(e.indexOf("@"),e.indexOf(".js:")+4);this.stack=n.find(o=>!o.includes(r))}};function ft(t,e,n){let r=[];B(n)!=="[object Object]"&&(n={});let{onclear:o}=b.symbols;n[o]&&(r.push(n[o]),Reflect.deleteProperty(n,o));let{host:c}=g;return Reflect.defineProperty(t,l,{value:{value:e,actions:n,onclear:r,host:c,listeners:new Set,defined:new U},enumerable:!1,writable:!1,configurable:!0}),t.toJSON=()=>t(),Object.setPrototypeOf(t[l],ut),t}function at(){return M[M.length-1]}function dt(t){if(!t[l])return;let{value:e,listeners:n}=t[l],r=at();return r&&n.add(r),h.has(r)&&h.get(r).add(t),e}function lt(t,e,n){if(!t[l])return;let r=t[l];if(!(!n&&r.value===e))return r.value=e,r.listeners.forEach(o=>o(e)),e}function q(t,e){if(t[l])return t[l].listeners.add(e)}function R(t,e,n){let r=t[l];if(!r)return;let o=r.listeners.delete(e);if(n&&!r.listeners.size){if(b.clear(t),!h.has(r))return o;let c=h.get(r);if(!h.has(c))return o;h.get(c).forEach(s=>R(s,c,!0))}return o}T(X);export{b as S,j as assign,Z as assignAttribute,et as chainableAppend,nt as classListDeclarative,S as createElement,Et as createElementNS,yt as dispatchEvent,S as el,Et as elNS,A as elementAttribute,vt as empty,W as isSignal,_ as on,T as registerReactivity,g as scope};

dist/esm.js

@@ -1 +1 @@
-var v={isSignal(t){return!1},processReactiveAttribute(t,e,n,c){return n}};function U(t,e=!0){return e?Object.assign(v,t):(Object.setPrototypeOf(t,v),t)}function x(t){return v.isPrototypeOf(t)&&t!==v?t:v}function b(t){return typeof t>"u"}function A(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var S={setDeleteAttr:k,ssr:""};function k(t,e,n){if(Reflect.set(t,e,n),!!b(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var l=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],E={get current(){return l[l.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...l]},push(t={}){return l.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return l.push(l[0])},pop(){if(l.length!==1)return l.pop()}};function L(...t){return this.appendOriginal(...t),this}function q(t){return t.append===L||(t.appendOriginal=t.append,t.append=L),t}var O;function N(t,e,...n){let c=x(this),o=0,r,f;switch((Object(e)!==e||c.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,E.push({scope:t,host:(...h)=>h.length?(o===1?n.unshift(...h):h.forEach(g=>g(f)),void 0):f}),r=t(e||void 0);let d=r instanceof DocumentFragment;if(r.nodeName==="#comment")break;let a=N.mark({type:"component",name:t.name,host:d?"this":"parentElement"});r.prepend(a),d&&(f=a);break}case t==="#text":r=w.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):r=w.call(this,document.createDocumentFragment(),e);break;case!!O:r=w.call(this,document.createElementNS(O,t),e);break;case!r:r=w.call(this,document.createElement(t),e)}return q(r),f||(f=r),n.forEach(d=>d(f)),o&&E.pop(),o=2,r}N.mark=function(t,e=!1){t=Object.entries(t).map(([o,r])=>o+`="${r}"`).join(" ");let n=e?"":"/",c=document.createComment(`<dde:mark ${t}${S.ssr}${n}>`);return e||(c.end=document.createComment("</dde:mark>")),c};function Y(t){let e=this;return function(...c){O=t;let o=N.call(e,...c);return O=void 0,o}}var{setDeleteAttr:j}=S,C=new WeakMap;function w(t,...e){if(!e.length)return t;C.set(t,M(t,this));for(let[n,c]of Object.entries(Object.assign({},...e)))W.call(this,t,n,c);return C.delete(t),t}function W(t,e,n){let{setRemoveAttr:c,s:o}=M(t,this),r=this;n=o.processReactiveAttribute(t,e,n,(d,a)=>W.call(r,t,d,a));let[f]=e;if(f==="=")return c(e.slice(1),n);if(f===".")return P(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),c(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return c(e,n,"http://www.w3.org/1999/xlink");case"textContent":return j(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return y(o,n,P.bind(null,t[e]));case"ariaset":return y(o,n,(d,a)=>c("aria-"+d,a));case"classList":return z.call(r,t,n)}return B(t,e)?j(t,e,n):c(e,n)}function M(t,e){if(C.has(t))return C.get(t);let c=(t instanceof SVGElement?I:F).bind(null,t,"Attribute"),o=x(e);return{setRemoveAttr:c,s:o}}function z(t,e){let n=x(this);return y(n,e,(c,o)=>t.classList.toggle(c,o===-1?void 0:!!o)),t}function tt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function B(t,e){if(!Reflect.has(t,e))return!1;let n=T(t,e);return!b(n.set)}function T(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||T(t,e)}function y(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,r]){o&&(r=t.processReactiveAttribute(e,o,r,n),n(o,r))})}function $(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function F(t,e,n,c){return t[(b(c)?"remove":"set")+e](n,$(c))}function I(t,e,n,c,o=null){return t[(b(c)?"remove":"set")+e+"NS"](o,n,$(c))}function P(t,e,n){if(Reflect.set(t,e,n),!!b(n))return Reflect.deleteProperty(t,e)}function rt(t,e,n){return e||(e={}),function(o,...r){n&&(r.unshift(o),o=typeof n=="function"?n():n);let f=r.length?new CustomEvent(t,Object.assign({detail:r[0]},e)):new Event(t,e);return o.dispatchEvent(f)}}function _(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var R=G(),Z=new WeakSet;_.connected=function(t,e){let{custom_element:n}=E.current,c="connected";return typeof e!="object"&&(e={}),e.once=!0,function(r){n&&(r=n);let f="dde:"+c;return r.addEventListener(f,t,e),r.__dde_lifecycleToEvents?r:r.isConnected?(r.dispatchEvent(new Event(f)),r):(A(e.signal,()=>R.offConnected(r,t))&&R.onConnected(r,t),r)}};_.disconnected=function(t,e){let{custom_element:n}=E.current,c="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(r){n&&(r=n);let f="dde:"+c;return r.addEventListener(f,t,e),r.__dde_lifecycleToEvents||A(e.signal,()=>R.offDisconnected(r,t))&&R.onDisconnected(r,t),r}};var D=new WeakMap;_.disconnectedAsAbort=function(t){if(D.has(t))return D.get(t);let e=new AbortControLine truncated
+var E={isSignal(t){return!1},processReactiveAttribute(t,e,n,c){return n}};function U(t,e=!0){return e?Object.assign(E,t):(Object.setPrototypeOf(t,E),t)}function x(t){return E.isPrototypeOf(t)&&t!==E?t:E}function b(t){return typeof t>"u"}function A(t,e){if(!t||!(t instanceof AbortSignal))return!0;if(!t.aborted)return t.addEventListener("abort",e),function(){t.removeEventListener("abort",e)}}var R={setDeleteAttr:q,ssr:""};function q(t,e,n){if(Reflect.set(t,e,n),!!b(n)){if(Reflect.deleteProperty(t,e),t instanceof HTMLElement&&t.getAttribute(e)==="undefined")return t.removeAttribute(e);if(Reflect.get(t,e)==="undefined")return Reflect.set(t,e,"")}}var l=[{scope:document.body,host:t=>t?t(document.body):document.body,custom_element:!1,prevent:!0}],v={get current(){return l[l.length-1]},get host(){return this.current.host},preventDefault(){let{current:t}=this;return t.prevent=!0,t},get state(){return[...l]},push(t={}){return l.push(Object.assign({},this.current,{prevent:!1},t))},pushRoot(){return l.push(l[0])},pop(){if(l.length!==1)return l.pop()}};function D(...t){return this.appendOriginal(...t),this}function z(t){return t.append===D||(t.appendOriginal=t.append,t.append=D),t}var O;function N(t,e,...n){let c=x(this),o=0,r,f;switch((Object(e)!==e||c.isSignal(e))&&(e={textContent:e}),!0){case typeof t=="function":{o=1,v.push({scope:t,host:(...h)=>h.length?(o===1?n.unshift(...h):h.forEach(g=>g(f)),void 0):f}),r=t(e||void 0);let d=r instanceof DocumentFragment;if(r.nodeName==="#comment")break;let a=N.mark({type:"component",name:t.name,host:d?"this":"parentElement"});r.prepend(a),d&&(f=a);break}case t==="#text":r=w.call(this,document.createTextNode(""),e);break;case(t==="<>"||!t):r=w.call(this,document.createDocumentFragment(),e);break;case!!O:r=w.call(this,document.createElementNS(O,t),e);break;case!r:r=w.call(this,document.createElement(t),e)}return z(r),f||(f=r),n.forEach(d=>d(f)),o&&v.pop(),o=2,r}N.mark=function(t,e=!1){t=Object.entries(t).map(([o,r])=>o+`="${r}"`).join(" ");let n=e?"":"/",c=document.createComment(`<dde:mark ${t}${R.ssr}${n}>`);return e||(c.end=document.createComment("</dde:mark>")),c};function Y(t){let e=this;return function(...c){O=t;let o=N.call(e,...c);return O=void 0,o}}var{setDeleteAttr:j}=R,C=new WeakMap;function w(t,...e){if(!e.length)return t;C.set(t,T(t,this));for(let[n,c]of Object.entries(Object.assign({},...e)))M.call(this,t,n,c);return C.delete(t),t}function M(t,e,n){let{setRemoveAttr:c,s:o}=T(t,this),r=this;n=o.processReactiveAttribute(t,e,n,(d,a)=>M.call(r,t,d,a));let[f]=e;if(f==="=")return c(e.slice(1),n);if(f===".")return P(t,e.slice(1),n);if(/(aria|data)([A-Z])/.test(e))return e=e.replace(/([a-z])([A-Z])/g,"$1-$2").toLowerCase(),c(e,n);switch(e==="className"&&(e="class"),e){case"xlink:href":return c(e,n,"http://www.w3.org/1999/xlink");case"textContent":return j(t,e,n);case"style":if(typeof n!="object")break;case"dataset":return y(o,n,P.bind(null,t[e]));case"ariaset":return y(o,n,(d,a)=>c("aria-"+d,a));case"classList":return B.call(r,t,n)}return F(t,e)?j(t,e,n):c(e,n)}function T(t,e){if(C.has(t))return C.get(t);let c=(t instanceof SVGElement?H:k).bind(null,t,"Attribute"),o=x(e);return{setRemoveAttr:c,s:o}}function B(t,e){let n=x(this);return y(n,e,(c,o)=>t.classList.toggle(c,o===-1?void 0:!!o)),t}function tt(t){return Array.from(t.children).forEach(e=>e.remove()),t}function et(t,e,n,c){return t instanceof HTMLElement?t[e+"Attribute"](n,c):t[e+"AttributeNS"](null,n,c)}function F(t,e){if(!Reflect.has(t,e))return!1;let n=W(t,e);return!b(n.set)}function W(t,e){if(t=Object.getPrototypeOf(t),!t)return{};let n=Object.getOwnPropertyDescriptor(t,e);return n||W(t,e)}function y(t,e,n){if(!(typeof e!="object"||e===null))return Object.entries(e).forEach(function([o,r]){o&&(r=t.processReactiveAttribute(e,o,r,n),n(o,r))})}function $(t){return Array.isArray(t)?t.filter(Boolean).join(" "):t}function k(t,e,n,c){return t[(b(c)?"remove":"set")+e](n,$(c))}function H(t,e,n,c,o=null){return t[(b(c)?"remove":"set")+e+"NS"](o,n,$(c))}function P(t,e,n){if(Reflect.set(t,e,n),!!b(n))return Reflect.deleteProperty(t,e)}function ot(t,e,n){return e||(e={}),function(o,...r){n&&(r.unshift(o),o=typeof n=="function"?n():n);let f=r.length?new CustomEvent(t,Object.assign({detail:r[0]},e)):new Event(t,e);return o.dispatchEvent(f)}}function _(t,e,n){return function(o){return o.addEventListener(t,e,n),o}}var S=Z(),I=new WeakSet;_.connected=function(t,e){let{custom_element:n}=v.current,c="connected";return typeof e!="object"&&(e={}),e.once=!0,function(r){n&&(r=n);let f="dde:"+c;return r.addEventListener(f,t,e),r.__dde_lifecycleToEvents?r:r.isConnected?(r.dispatchEvent(new Event(f)),r):(A(e.signal,()=>S.offConnected(r,t))&&S.onConnected(r,t),r)}};_.disconnected=function(t,e){let{custom_element:n}=v.current,c="disconnected";return typeof e!="object"&&(e={}),e.once=!0,function(r){n&&(r=n);let f="dde:"+c;return r.addEventListener(f,t,e),r.__dde_lifecycleToEvents||A(e.signal,()=>S.offDisconnected(r,t))&&S.onDisconnected(r,t),rLine truncated

examples/components/webComponent.js

@@ -13,19 +13,19 @@ export class CustomHTMLTestElement extends HTMLElement{
 	connectedCallback(){
 		if(!this.hasAttribute("pre-name")) this.setAttribute("pre-name", "default");
 		this.attachShadow({ mode: "open" }).append(
-			customElementRender(this, this.render, observedAttributes(S))
+			customElementRender(this, this.render)
 		);
 	}
 
-	render({ name, preName }){
-		const { host }= scope;
-		const { test }= host();
+	render({ test }){
 		console.log(scope.state);
-		host(
+		scope.host(
 			on.connected(()=> console.log(CustomHTMLTestElement)),
 			on.attributeChanged(e=> console.log(e)),
 			on.disconnected(()=> console.log(CustomHTMLTestElement))
 		);
+		const name= S.attribute("name");
+		const preName= S.attribute("pre-name");
 		
 		console.log({ name, test, preName});
 		return el("p").append(
@@ -46,7 +46,7 @@ export class CustomHTMLTestElement extends HTMLElement{
 lifecycleToEvents(CustomHTMLTestElement)
 customElements.define(CustomHTMLTestElement.tagName, CustomHTMLTestElement);
 
-function customElementRender(_this, render, props){
+function customElementRender(_this, render, props= _this){
 	console.log(_this.shadowRoot, _this.childList);
 	scope.push({ scope: _this, host: (...c)=> c.length ? c.forEach(c=> c(_this)) : _this, custom_element: _this });
 	if(typeof props==="function") props= props(_this);
@@ -54,17 +54,6 @@ function customElementRender(_this, render, props){
 	scope.pop();
 	return out;
 }
-function observedAttributes(options, element){
-	const fromAttribute= typeof options==="undefined" ? (_1, _2, v)=> v : ( options.fromAttribute || options );
-	if(!element) return observedAttributes.bind(null, fromAttribute)
-	return Object.fromEntries(
-		element.constructor.observedAttributes
-		.map(name=> [
-			name.replace(/-./g, m=> m.slice(1).toUpperCase()),
-			fromAttribute(element, name, element.getAttribute(name))
-		])
-	);
-}
 function lifecycleToEvents(class_declaration){
 	for (const name of [ "connected", "disconnected" ])
 		wrapMethod(class_declaration.prototype, name+"Callback", function(target, thisArg, detail){

package.json

@@ -58,7 +58,7 @@
 	"size-limit": [
 		{
 			"path": "./index.js",
-			"limit": "8 kB",
+			"limit": "8.5 kB",
 			"gzip": false
 		},
 		{

signals.d.ts

@@ -54,7 +54,7 @@ interface S {
 	 * */
 	el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[]): DocumentFragment;
 
-    fromAttribute<T>(element: HTMLElement, name: string, value?: T): Signal<T, {}>;
+    attribute(name: string, initial?: string): Signal<string, {}>;
 }
 export const S: S;
 declare global {

src/dom.js

@@ -151,6 +151,11 @@ export function empty(el){
 	Array.from(el.children).forEach(el=> el.remove());
 	return el;
 }
+export function elementAttribute(element, op, key, value){
+	if(element instanceof HTMLElement)
+		return element[op+"Attribute"](key, value);
+	return element[op+"AttributeNS"](null, key, value);
+}
 import { isUndef } from "./helpers.js";
 //TODO add cache? `(Map/Set)<el.tagName+key,isUndef>`
 function isPropSetter(el, key){

src/signals-lib.js

@@ -85,7 +85,7 @@ S.clear= function(...signals){
 	}
 };
 const key_reactive= "__dde_reactive";
-import { el } from "./dom.js";
+import { el, elementAttribute } from "./dom.js";
 import { scope } from "./dom.js";
 S.el= function(signal, map){
 	const mark_start= el.mark({ type: "reactive" }, false);
@@ -113,9 +113,20 @@ S.el= function(signal, map){
 };
 import { on } from "./events.js";
 const key_attributes= "__dde_attributes";
-S.fromAttribute= function(element, name, value){
-	if(!element[key_attributes]){ // needs registration
-		element[key_attributes]= {};
+S.attribute= function(name, initial= null){
+	//TODO host=element & reuse existing
+	const out= S(initial);
+	let element;
+	scope.host(el=> {
+		element= el;
+		if(elementAttribute(element, "has", name)) out(elementAttribute(element, "get", name));
+		else if(initial!==null) elementAttribute(element, "set", name, initial);
+		
+		if(el[key_attributes]){
+			el[key_attributes][name]= out;
+			return;
+		}
+		element[key_attributes]= { [name]: out };
 		on.attributeChanged(function attributeChangeToSignal({ detail }){
 			/*! This maps attributes to signals (`S.attribute`).
 			 * Investigate `__dde_attributes` key of the element.*/
@@ -128,14 +139,12 @@ S.fromAttribute= function(element, name, value){
 			 * Investigate `__dde_attributes` key of the element.*/
 			S.clear(...Object.values(element[key_attributes]));
 		})(element);
-	}
-	const store= element[key_attributes];
-	const out= Reflect.has(store, name) ? Reflect.get(store, name) : (store[name]= S(value));
+	});
 	return new Proxy(out, {
 		apply(target, _, args){
 			if(!args.length) return target();
 			const value= args[0];
-			return element.setAttribute(name, value);
+			return elementAttribute(element, "set", name, value);
 		}
 	});
 };