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Jan Andrle 2024-06-07 16:14:15 +02:00
parent 55860b99eb
commit a60c2dd053
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GPG Key ID: B3A25AED155AFFAB
7 changed files with 200 additions and 169 deletions
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172
dist/esm-with-signals.d.ts vendored
View File

@ -1,69 +1,4 @@
export type Signal<V, A>= (set?: V)=> V & A;
type Action<V>= (this: { value: V, stopPropagation(): void }, ...a: any[])=> typeof signal._ | void;
//type SymbolSignal= Symbol;
type SymbolOnclear= symbol;
type Actions<V>= Record<string | SymbolOnclear, Action<V>>;
type OnListenerOptions= Pick<AddEventListenerOptions, "signal"> & { first_time?: boolean };
interface signal{
_: Symbol
/**
* Simple example:
* ```js
* const hello= S("Hello Signal");
* ```
* …simple todo signal:
* ```js
* const todos= S([], {
* add(v){ this.value.push(S(v)); },
* remove(i){ this.value.splice(i, 1); },
* [S.symbols.onclear](){ S.clear(...this.value); },
* });
* ```
* …computed signal:
* ```js
* const name= S("Jan");
* const surname= S("Andrle");
* const fullname= S(()=> name()+" "+surname());
* ```
* @param value Initial signal value. Or function computing value from other signals.
* @param actions Use to define actions on the signal. Such as add item to the array.
* There is also a reserved function `S.symbol.onclear` which is called when the signal is cleared
* by `S.clear`.
* */
<V, A extends Actions<V>>(value: V, actions?: A): Signal<V, A>;
/**
* Computations signal. This creates a signal which is computed from other signals.
* */
<V>(computation: ()=> V): Signal<V, {}>
action<S extends Signal<any, Actions<any>>, A extends (S extends Signal<any, infer A> ? A : never), N extends keyof A>(
signal: S,
name: N,
...params: A[N] extends (...args: infer P)=> any ? P : never
): void;
clear(...signals: Signal<any, any>[]): void;
on<T>(signal: Signal<T, any>, onchange: (a: T)=> void, options?: OnListenerOptions): void;
symbols: {
//signal: SymbolSignal;
onclear: SymbolOnclear;
}
/**
* Reactive element, which is rendered based on the given signal.
* ```js
* S.el(signal, value=> value ? el("b", "True") : el("i", "False"));
* S.el(listS, list=> list.map(li=> el("li", li)));
* ```
* */
el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[] | DocumentFragment): DocumentFragment;
observedAttributes(custom_element: HTMLElement): Record<string, Signal<any, any>>;
}
export const signal: signal;
export const S: signal;
declare global {
type ddeSignal<T, A= {}>= Signal<T, A>;
type ddeAction<V>= Action<V>
type ddeActions<V>= Actions<V>
}
declare global{ /* ddeSignal */ }
type CustomElementTagNameMap= { '#text': Text, '#comment': Comment }
type SupportedElement=
HTMLElementTagNameMap[keyof HTMLElementTagNameMap]
@ -80,20 +15,20 @@ type AttrsModified= {
/**
* Use string like in HTML (internally uses `*.setAttribute("style", *)`), or object representation (like DOM API).
*/
style: string | Partial<CSSStyleDeclaration> | Signal<string, any> | Partial<{ [K in keyof CSSStyleDeclaration]: Signal<CSSStyleDeclaration[K], any> }>
style: string | Partial<CSSStyleDeclaration> | ddeSignal<string> | Partial<{ [K in keyof CSSStyleDeclaration]: ddeSignal<CSSStyleDeclaration[K]> }>
/**
* Provide option to add/remove/toggle CSS clasess (index of object) using 1/0/-1. In fact `el.classList.toggle(class_name)` for `-1` and `el.classList.toggle(class_name, Boolean(...))` for others.
*/
classList: Record<string,-1|0|1|boolean|Signal<-1|0|1|boolean, any>>,
classList: Record<string,-1|0|1|boolean|ddeSignal<-1|0|1|boolean>>,
/**
* By default simiral to `className`, but also supports `string[]`
* */
className: string | (string|boolean|undefined|Signal<string|boolean|undefined, any>)[];
className: string | (string|boolean|undefined|ddeSignal<string|boolean|undefined>)[];
/**
* Sets `aria-*` simiraly to `dataset`
* */
ariaset: Record<string,string|Signal<string, any>>,
} & Record<`=${string}` | `data${PascalCase}` | `aria${PascalCase}`, string|Signal<string, any>> & Record<`.${string}`, any>
ariaset: Record<string,string|ddeSignal<string>>,
} & Record<`=${string}` | `data${PascalCase}` | `aria${PascalCase}`, string|ddeSignal<string>> & Record<`.${string}`, any>
type _fromElsInterfaces<EL extends SupportedElement>= Omit<EL, keyof AttrsModified>;
/**
* Just element attributtes
@ -103,15 +38,15 @@ type _fromElsInterfaces<EL extends SupportedElement>= Omit<EL, keyof AttrsModifi
* There is added support for `data[A-Z].*`/`aria[A-Z].*` to be converted to the kebab-case alternatives.
* @private
*/
type ElementAttributes<T extends SupportedElement>= Partial<_fromElsInterfaces<T> & { [K in keyof _fromElsInterfaces<T>]: Signal<_fromElsInterfaces<T>[K], any> } & AttrsModified> & Record<string, any>;
type ElementAttributes<T extends SupportedElement>= Partial<{ [K in keyof _fromElsInterfaces<T>]: _fromElsInterfaces<T>[K] | ddeSignal<_fromElsInterfaces<T>[K]> } & AttrsModified> & Record<string, any>;
export function classListDeclarative<El extends SupportedElement>(element: El, classList: AttrsModified["classList"]): El
export function assign<El extends SupportedElement>(element: El, ...attrs_array: ElementAttributes<El>[]): El
export function assignAttribute<El extends SupportedElement, ATT extends keyof ElementAttributes<El>>(element: El, attr: ATT, value: ElementAttributes<El>[ATT]): ElementAttributes<El>[ATT]
type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap;
type textContent= string | ( (set?: string)=> string ); // TODO: for some reason `Signal<string, any>` leads to `attrs?: any`
type textContent= string | ddeSignal<string>;
export function el<
TAG extends keyof ExtendedHTMLElementTagNameMap & string,
TAG extends keyof ExtendedHTMLElementTagNameMap,
EL extends (TAG extends keyof ExtendedHTMLElementTagNameMap ? ExtendedHTMLElementTagNameMap[TAG] : HTMLElement)
>(
tag_name: TAG,
@ -121,6 +56,11 @@ export function el<
export function el(
tag_name?: "<>",
): ddeDocumentFragment
export function el(
tag_name: string,
attrs?: ElementAttributes<HTMLElement>,
...addons: ddeElementAddon<HTMLElement>[]
): ddeHTMLElement
export function el<
C extends (attr: ddeComponentAttributes)=> SupportedElement | ddeDocumentFragment
@ -148,7 +88,7 @@ export function elNS(
EL extends ( TAG extends keyof MathMLElementTagNameMap ? MathMLElementTagNameMap[TAG] : MathMLElement ),
>(
tag_name: TAG,
attrs?: string | textContent | Partial<{ [key in keyof EL]: EL[key] | Signal<EL[key], any> | string | number | boolean }>,
attrs?: string | textContent | Partial<{ [key in keyof EL]: EL[key] | ddeSignal<EL[key]> | string | number | boolean }>,
...addons: ddeElementAddon<EL>[]
)=> ddeMathMLElement
export function elNS(
@ -189,7 +129,7 @@ interface On{
EE extends ddeElementAddon<SupportedElement>,
El extends ( EE extends ddeElementAddon<infer El> ? El : never )
>(
listener: (this: El, event: CustomEvent<void>) => any,
listener: (this: El, event: CustomEvent<El>) => any,
options?: AddEventListenerOptions
) : EE;
/** Listens to the element is disconnected from the live DOM. In case of custom elements uses [`disconnectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
@ -224,7 +164,7 @@ export const scope: {
* It can be also used to register Addon(s) (functions to be called when component is initized)
* — `scope.host(on.connected(console.log))`.
* */
host: (...addons: ddeElementAddon<any>[])=> HTMLElement,
host: (...addons: ddeElementAddon<SupportedElement>[])=> HTMLElement,
state: Scope[],
/** Adds new child scope. All attributes are inherited by default. */
@ -237,15 +177,15 @@ export const scope: {
export function customElementRender<
EL extends HTMLElement,
P extends any = Record<string, any>
P extends any = Record<string, string | ddeSignal<string>>
>(
custom_element: EL,
target: ShadowRoot | EL,
render: (props: P)=> SupportedElement,
props?: P | ((...args: any[])=> P)
render: (props: P)=> SupportedElement | DocumentFragment,
props?: P | ((el: EL)=> P)
): EL
export function customElementWithDDE<EL extends HTMLElement>(custom_element: EL): EL
export function lifecyclesToEvents<EL extends HTMLElement>(custom_element: EL): EL
export function customElementWithDDE<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL
export function lifecyclesToEvents<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL
export function observedAttributes(custom_element: HTMLElement): Record<string, string>
/* TypeScript MEH */
@ -525,4 +465,70 @@ interface ddeSVGTextPathElement extends SVGTextPathElement{ append: ddeAppend<dd
interface ddeSVGTitleElement extends SVGTitleElement{ append: ddeAppend<ddeSVGTitleElement>; }
interface ddeSVGTSpanElement extends SVGTSpanElement{ append: ddeAppend<ddeSVGTSpanElement>; }
interface ddeSVGUseElement extends SVGUseElement{ append: ddeAppend<ddeSVGUseElement>; }
interface ddeSVGViewElement extends SVGViewElement{ append: ddeAppend<ddeSVGViewElement>; }
interface ddeSVGViewElement extends SVGViewElement{ append: ddeAppend<ddeSVGViewElement>; }
export type Signal<V, A>= (set?: V)=> V & A;
type Action<V>= (this: { value: V, stopPropagation(): void }, ...a: any[])=> typeof signal._ | void;
//type SymbolSignal= Symbol;
type SymbolOnclear= symbol;
type Actions<V>= Record<string | SymbolOnclear, Action<V>>;
type OnListenerOptions= Pick<AddEventListenerOptions, "signal"> & { first_time?: boolean };
interface signal{
_: Symbol
/**
* Computations signal. This creates a signal which is computed from other signals.
* */
<V extends ()=> any>(computation: V): Signal<ReturnType<V>, {}>
/**
* Simple example:
* ```js
* const hello= S("Hello Signal");
* ```
* …simple todo signal:
* ```js
* const todos= S([], {
* add(v){ this.value.push(S(v)); },
* remove(i){ this.value.splice(i, 1); },
* [S.symbols.onclear](){ S.clear(...this.value); },
* });
* ```
* …computed signal:
* ```js
* const name= S("Jan");
* const surname= S("Andrle");
* const fullname= S(()=> name()+" "+surname());
* ```
* @param value Initial signal value. Or function computing value from other signals.
* @param actions Use to define actions on the signal. Such as add item to the array.
* There is also a reserved function `S.symbol.onclear` which is called when the signal is cleared
* by `S.clear`.
* */
<V, A extends Actions<V>>(value: V, actions?: A): Signal<V, A>;
action<S extends Signal<any, Actions<any>>, A extends (S extends Signal<any, infer A> ? A : never), N extends keyof A>(
signal: S,
name: N,
...params: A[N] extends (...args: infer P)=> any ? P : never
): void;
clear(...signals: Signal<any, any>[]): void;
on<T>(signal: Signal<T, any>, onchange: (a: T)=> void, options?: OnListenerOptions): void;
symbols: {
//signal: SymbolSignal;
onclear: SymbolOnclear;
}
/**
* Reactive element, which is rendered based on the given signal.
* ```js
* S.el(signal, value=> value ? el("b", "True") : el("i", "False"));
* S.el(listS, list=> list.map(li=> el("li", li)));
* ```
* */
el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[] | DocumentFragment): DocumentFragment;
observedAttributes(custom_element: HTMLElement): Record<string, Signal<string, {}>>;
}
export const signal: signal;
export const S: signal;
declare global {
type ddeSignal<T, A= {}>= Signal<T, A>;
type ddeAction<V>= Action<V>
type ddeActions<V>= Actions<V>
}

104
dist/esm.d.ts vendored
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@ -1,69 +1,4 @@
export type Signal<V, A>= (set?: V)=> V & A;
type Action<V>= (this: { value: V, stopPropagation(): void }, ...a: any[])=> typeof signal._ | void;
//type SymbolSignal= Symbol;
type SymbolOnclear= symbol;
type Actions<V>= Record<string | SymbolOnclear, Action<V>>;
type OnListenerOptions= Pick<AddEventListenerOptions, "signal"> & { first_time?: boolean };
interface signal{
_: Symbol
/**
* Simple example:
* ```js
* const hello= S("Hello Signal");
* ```
* …simple todo signal:
* ```js
* const todos= S([], {
* add(v){ this.value.push(S(v)); },
* remove(i){ this.value.splice(i, 1); },
* [S.symbols.onclear](){ S.clear(...this.value); },
* });
* ```
* …computed signal:
* ```js
* const name= S("Jan");
* const surname= S("Andrle");
* const fullname= S(()=> name()+" "+surname());
* ```
* @param value Initial signal value. Or function computing value from other signals.
* @param actions Use to define actions on the signal. Such as add item to the array.
* There is also a reserved function `S.symbol.onclear` which is called when the signal is cleared
* by `S.clear`.
* */
<V, A extends Actions<V>>(value: V, actions?: A): Signal<V, A>;
/**
* Computations signal. This creates a signal which is computed from other signals.
* */
<V>(computation: ()=> V): Signal<V, {}>
action<S extends Signal<any, Actions<any>>, A extends (S extends Signal<any, infer A> ? A : never), N extends keyof A>(
signal: S,
name: N,
...params: A[N] extends (...args: infer P)=> any ? P : never
): void;
clear(...signals: Signal<any, any>[]): void;
on<T>(signal: Signal<T, any>, onchange: (a: T)=> void, options?: OnListenerOptions): void;
symbols: {
//signal: SymbolSignal;
onclear: SymbolOnclear;
}
/**
* Reactive element, which is rendered based on the given signal.
* ```js
* S.el(signal, value=> value ? el("b", "True") : el("i", "False"));
* S.el(listS, list=> list.map(li=> el("li", li)));
* ```
* */
el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[] | DocumentFragment): DocumentFragment;
observedAttributes(custom_element: HTMLElement): Record<string, Signal<any, any>>;
}
export const signal: signal;
export const S: signal;
declare global {
type ddeSignal<T, A= {}>= Signal<T, A>;
type ddeAction<V>= Action<V>
type ddeActions<V>= Actions<V>
}
declare global{ /* ddeSignal */ }
type CustomElementTagNameMap= { '#text': Text, '#comment': Comment }
type SupportedElement=
HTMLElementTagNameMap[keyof HTMLElementTagNameMap]
@ -80,20 +15,20 @@ type AttrsModified= {
/**
* Use string like in HTML (internally uses `*.setAttribute("style", *)`), or object representation (like DOM API).
*/
style: string | Partial<CSSStyleDeclaration> | Signal<string, any> | Partial<{ [K in keyof CSSStyleDeclaration]: Signal<CSSStyleDeclaration[K], any> }>
style: string | Partial<CSSStyleDeclaration> | ddeSignal<string> | Partial<{ [K in keyof CSSStyleDeclaration]: ddeSignal<CSSStyleDeclaration[K]> }>
/**
* Provide option to add/remove/toggle CSS clasess (index of object) using 1/0/-1. In fact `el.classList.toggle(class_name)` for `-1` and `el.classList.toggle(class_name, Boolean(...))` for others.
*/
classList: Record<string,-1|0|1|boolean|Signal<-1|0|1|boolean, any>>,
classList: Record<string,-1|0|1|boolean|ddeSignal<-1|0|1|boolean>>,
/**
* By default simiral to `className`, but also supports `string[]`
* */
className: string | (string|boolean|undefined|Signal<string|boolean|undefined, any>)[];
className: string | (string|boolean|undefined|ddeSignal<string|boolean|undefined>)[];
/**
* Sets `aria-*` simiraly to `dataset`
* */
ariaset: Record<string,string|Signal<string, any>>,
} & Record<`=${string}` | `data${PascalCase}` | `aria${PascalCase}`, string|Signal<string, any>> & Record<`.${string}`, any>
ariaset: Record<string,string|ddeSignal<string>>,
} & Record<`=${string}` | `data${PascalCase}` | `aria${PascalCase}`, string|ddeSignal<string>> & Record<`.${string}`, any>
type _fromElsInterfaces<EL extends SupportedElement>= Omit<EL, keyof AttrsModified>;
/**
* Just element attributtes
@ -103,15 +38,15 @@ type _fromElsInterfaces<EL extends SupportedElement>= Omit<EL, keyof AttrsModifi
* There is added support for `data[A-Z].*`/`aria[A-Z].*` to be converted to the kebab-case alternatives.
* @private
*/
type ElementAttributes<T extends SupportedElement>= Partial<_fromElsInterfaces<T> & { [K in keyof _fromElsInterfaces<T>]: Signal<_fromElsInterfaces<T>[K], any> } & AttrsModified> & Record<string, any>;
type ElementAttributes<T extends SupportedElement>= Partial<{ [K in keyof _fromElsInterfaces<T>]: _fromElsInterfaces<T>[K] | ddeSignal<_fromElsInterfaces<T>[K]> } & AttrsModified> & Record<string, any>;
export function classListDeclarative<El extends SupportedElement>(element: El, classList: AttrsModified["classList"]): El
export function assign<El extends SupportedElement>(element: El, ...attrs_array: ElementAttributes<El>[]): El
export function assignAttribute<El extends SupportedElement, ATT extends keyof ElementAttributes<El>>(element: El, attr: ATT, value: ElementAttributes<El>[ATT]): ElementAttributes<El>[ATT]
type ExtendedHTMLElementTagNameMap= HTMLElementTagNameMap & CustomElementTagNameMap;
type textContent= string | ( (set?: string)=> string ); // TODO: for some reason `Signal<string, any>` leads to `attrs?: any`
type textContent= string | ddeSignal<string>;
export function el<
TAG extends keyof ExtendedHTMLElementTagNameMap & string,
TAG extends keyof ExtendedHTMLElementTagNameMap,
EL extends (TAG extends keyof ExtendedHTMLElementTagNameMap ? ExtendedHTMLElementTagNameMap[TAG] : HTMLElement)
>(
tag_name: TAG,
@ -121,6 +56,11 @@ export function el<
export function el(
tag_name?: "<>",
): ddeDocumentFragment
export function el(
tag_name: string,
attrs?: ElementAttributes<HTMLElement>,
...addons: ddeElementAddon<HTMLElement>[]
): ddeHTMLElement
export function el<
C extends (attr: ddeComponentAttributes)=> SupportedElement | ddeDocumentFragment
@ -148,7 +88,7 @@ export function elNS(
EL extends ( TAG extends keyof MathMLElementTagNameMap ? MathMLElementTagNameMap[TAG] : MathMLElement ),
>(
tag_name: TAG,
attrs?: string | textContent | Partial<{ [key in keyof EL]: EL[key] | Signal<EL[key], any> | string | number | boolean }>,
attrs?: string | textContent | Partial<{ [key in keyof EL]: EL[key] | ddeSignal<EL[key]> | string | number | boolean }>,
...addons: ddeElementAddon<EL>[]
)=> ddeMathMLElement
export function elNS(
@ -189,7 +129,7 @@ interface On{
EE extends ddeElementAddon<SupportedElement>,
El extends ( EE extends ddeElementAddon<infer El> ? El : never )
>(
listener: (this: El, event: CustomEvent<void>) => any,
listener: (this: El, event: CustomEvent<El>) => any,
options?: AddEventListenerOptions
) : EE;
/** Listens to the element is disconnected from the live DOM. In case of custom elements uses [`disconnectedCallback`](https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements#custom_element_lifecycle_callbacks), or {@link MutationObserver} else where */
@ -224,7 +164,7 @@ export const scope: {
* It can be also used to register Addon(s) (functions to be called when component is initized)
* — `scope.host(on.connected(console.log))`.
* */
host: (...addons: ddeElementAddon<any>[])=> HTMLElement,
host: (...addons: ddeElementAddon<SupportedElement>[])=> HTMLElement,
state: Scope[],
/** Adds new child scope. All attributes are inherited by default. */
@ -237,15 +177,15 @@ export const scope: {
export function customElementRender<
EL extends HTMLElement,
P extends any = Record<string, any>
P extends any = Record<string, string | ddeSignal<string>>
>(
custom_element: EL,
target: ShadowRoot | EL,
render: (props: P)=> SupportedElement,
props?: P | ((...args: any[])=> P)
render: (props: P)=> SupportedElement | DocumentFragment,
props?: P | ((el: EL)=> P)
): EL
export function customElementWithDDE<EL extends HTMLElement>(custom_element: EL): EL
export function lifecyclesToEvents<EL extends HTMLElement>(custom_element: EL): EL
export function customElementWithDDE<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL
export function lifecyclesToEvents<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL
export function observedAttributes(custom_element: HTMLElement): Record<string, string>
/* TypeScript MEH */

44
docs/p06-customElement.html
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File diff suppressed because one or more lines are too long

42
docs_src/components/examples/customElement/observedAttributes.js Normal file
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@ -0,0 +1,42 @@
import {
customElementRender,
customElementWithDDE,
observedAttributes,
el, on, scope
} from "deka-dom-el";
import { S } from "deka-dom-el/signals";
export class HTMLCustomElement extends HTMLElement{
static tagName= "custom-element";
static observedAttributes= [ "attr" ];
connectedCallback(){
console.log(observedAttributes(this));
customElementRender(
this,
this.attachShadow({ mode: "open" }),
ddeComponent,
S.observedAttributes
);
}
set attr(value){ this.setAttribute("attr", value); }
get attr(){ return this.getAttribute("attr"); }
}
/** @param {{ attr: ddeSignal<string, {}> }} props */
function ddeComponent({ attr }){
scope.host(
on.connected(e=> console.log(e.target.outerHTML)),
);
return el().append(
el("p", S(()=> `Hello from Custom Element with attribute '${attr()}'`))
);
}
customElementWithDDE(HTMLCustomElement);
customElements.define(HTMLCustomElement.tagName, HTMLCustomElement);
document.body.append(
el(HTMLCustomElement.tagName, { attr: "Attribute" })
);
setTimeout(
()=> document.querySelector(HTMLCustomElement.tagName).setAttribute("attr", "New Value"),
3*750
);

1
docs_src/p06-customElement.html.js
View File

@ -81,6 +81,7 @@ export function page({ pkg, info }){
and ${el("code", "observedAttributes")} (converts attributes to render function arguments —
${el("em", "default")}) or ${el("code", "S.observedAttributes")} (converts attributes to signals).
`),
el(example, { src: fileURL("./components/examples/customElement/observedAttributes.js"), page_id }),
el(mnemonic)

4
index.d.ts vendored
View File

@ -177,12 +177,12 @@ export const scope: {
export function customElementRender<
EL extends HTMLElement,
P extends any = Record<string, any>
P extends any = Record<string, string | ddeSignal<string>>
>(
custom_element: EL,
target: ShadowRoot | EL,
render: (props: P)=> SupportedElement | DocumentFragment,
props?: P | ((...args: any[])=> P)
props?: P | ((el: EL)=> P)
): EL
export function customElementWithDDE<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL
export function lifecyclesToEvents<EL extends (new ()=> HTMLElement)>(custom_element: EL): EL

2
signals.d.ts vendored
View File

@ -55,7 +55,7 @@ interface signal{
* */
el<S extends any>(signal: Signal<S, any>, el: (v: S)=> Element | Element[] | DocumentFragment): DocumentFragment;
observedAttributes(custom_element: HTMLElement): Record<string, Signal<any, any>>;
observedAttributes(custom_element: HTMLElement): Record<string, Signal<string, {}>>;
}
export const signal: signal;
export const S: signal;