feat: add triggerDomUpdates utility and refactor DOM update logic in main component

src/main.ts

@@ -59,7 +59,7 @@ export default (options: ComponentOptions) => {
 		constructor() {
 			super()
 
-			// initialize dom tree and append to shadow root
+			// initialize dom tree and append to shadow root, as well as initialize state
 			this._initialize()
 		}
 
@@ -85,7 +85,14 @@ export default (options: ComponentOptions) => {
 							}
 						}
 						// trigger dom updates
-						this._triggerDomUpdates(keyPath)
+						utils.triggerDomUpdates(keyPath, {
+							stateToElementsMap: this._stateToElementsMap,
+							textBindings: this._textBindings,
+							attributeBindings: this._attributeBindings,
+							updateTextNode: this._updateTextNode.bind(this),
+							getNestedState: this._getNestedState.bind(this),
+							scheduleUpdate: this._scheduleUpdate.bind(this),
+						})
 						if (this._statesListeners[keyPath])
 							this._statesListeners[keyPath](value)
 
@@ -160,45 +167,6 @@ export default (options: ComponentOptions) => {
 			})
 		}
 
-		private _triggerDomUpdates(keyPath: string) {
-			if (this._stateToElementsMap[keyPath]) {
-				const updateQueue = new Set<HTMLElement>()
-
-				for (const element of this._stateToElementsMap[keyPath]) {
-					updateQueue.add(element)
-				}
-
-				this._scheduleUpdate(updateQueue)
-			}
-
-			// Update text bindings that depend on this state
-			if (this._textBindings) {
-				// this._textBindings.forEach((binding) => {
-				for (const binding of this._textBindings)
-					if (
-						binding.expr === keyPath ||
-						binding.expr.startsWith(`${keyPath}.`)
-					)
-						this._updateTextNode(
-							binding.node,
-							binding.expr,
-							binding.originalContent,
-						)
-			}
-
-			// Update attribute bindings that depend on this state
-			if (this._attributeBindings) {
-				for (const binding of this._attributeBindings)
-					if (
-						binding.expr === keyPath ||
-						binding.expr.startsWith(`${keyPath}.`)
-					) {
-						const value = this._getNestedState(binding.expr)
-						if (value !== undefined)
-							binding.element.setAttribute(binding.attrName, String(value))
-					}
-			}
-		}
 
 		private _scheduleUpdate(elements: Set<HTMLElement>) {
 			requestAnimationFrame(() => {
@@ -1025,4 +993,4 @@ export default (options: ComponentOptions) => {
 	}
 
 	customElements.define(tag, CustomElementImpl)
-}
+}

src/utils/index.ts

@@ -1,7 +1,9 @@
-import { parseTemplate } from './parseTemplate'
-import { processTemplateMacros } from './processTemplateMarco'
+import parseTemplate from './parseTemplate'
+import processTemplateMacros from './processTemplateMarco'
+import triggerDomUpdates from './triggerDomUpdates'
 
 export default {
 	parseTemplate,
 	processTemplateMacros,
+	triggerDomUpdates,
 }

src/utils/parseTemplate.ts

@@ -1,4 +1,4 @@
-export function parseTemplate(template: string): Element {
+export default function parseTemplate(template: string): Element {
 	const parser = new DOMParser()
 	const doc = parser.parseFromString(template, 'text/html')
 

src/utils/processTemplateMarco.ts

@@ -1,4 +1,4 @@
-export function processTemplateMacros(
+export default function processTemplateMacros(
 	element: Element,
 	context: CustomElement,
 	options: {

src/utils/triggerDomUpdates.ts

@@ -0,0 +1,54 @@
+export default function triggerDomUpdates(keyPath: string, ops: {
+	stateToElementsMap: Record<string, Set<HTMLElement>>,
+	scheduleUpdate: (elements: Set<HTMLElement>) => void,
+	textBindings: Array<{
+		node: Text
+		expr: string
+		originalContent: string
+	}> | undefined,
+	attributeBindings: Array<{
+		element: Element
+		attrName: string
+		expr: string
+		template: string
+	}> | undefined,
+	updateTextNode: (node: Text, expr: string, template: string) => void,
+	getNestedState: (path: string) => unknown,
+}) {
+	if (ops.stateToElementsMap[keyPath]) {
+		const updateQueue = new Set<HTMLElement>()
+
+		for (const element of ops.stateToElementsMap[keyPath])
+			updateQueue.add(element)
+
+		ops.scheduleUpdate(updateQueue)
+	}
+
+	// Update text bindings that depend on this state
+	if (ops.textBindings) {
+		// this._textBindings.forEach((binding) => {
+		for (const binding of ops.textBindings)
+			if (
+				binding.expr === keyPath ||
+				binding.expr.startsWith(`${keyPath}.`)
+			)
+				ops.updateTextNode(
+					binding.node,
+					binding.expr,
+					binding.originalContent,
+				)
+	}
+
+	// Update attribute bindings that depend on this state
+	if (ops.attributeBindings) {
+		for (const binding of ops.attributeBindings)
+			if (
+				binding.expr === keyPath ||
+				binding.expr.startsWith(`${keyPath}.`)
+			) {
+				const value = ops.getNestedState(binding.expr)
+				if (value !== undefined)
+					binding.element.setAttribute(binding.attrName, String(value))
+			}
+	}
+}