chore: refactored api of system-theme-extractor

src/components/super/i-static-page/modules/theme/system-theme-extractor/engines/web/engine.ts

@@ -33,7 +33,7 @@ export default class WebEngine extends Friend implements SystemThemeExtractor {
 	}
 
 	/** @inheritDoc */
-	subscribe(cb: (value: string) => void): void {
+	onChange(cb: (value: string) => void): void {
 		if (this.darkThemeMq != null) {
 			return;
 		}
@@ -47,7 +47,7 @@ export default class WebEngine extends Friend implements SystemThemeExtractor {
 	}
 
 	/** @inheritDoc */
-	unsubscribe(): void {
+	destroy(): void {
 		if (this.darkThemeMq == null) {
 			return;
 		}

src/components/super/i-static-page/modules/theme/system-theme-extractor/interface.ts

@@ -13,18 +13,18 @@ export interface SystemThemeExtractor {
 	/**
 	 * Retrieves the current system visual appearance theme
 	 */
-	getSystemTheme(): PromiseLike<string>;
+	getSystemTheme(): Promise<string>;
 
 	/**
 	 * Initializes an event listener for changes in the system's visual appearance theme
 	 *
 	 * @param cb - A callback function to be invoked when the theme changes.
 	 *             It receives the color scheme identifier as a string parameter by which project theme can be selected.
 	 */
-	subscribe(cb: (value: string) => void): void;
+	onChange(cb: (value: string) => void): void;
 
 	/**
 	 * Terminates the event listener for changes in the system's visual appearance theme
 	 */
-	unsubscribe(): void;
+	destroy(): void;
 }

src/components/super/i-static-page/modules/theme/theme-manager.ts

@@ -130,10 +130,10 @@ export default class ThemeManager extends Friend {
 	/**
 	 * Sets the actual system theme and activates the system theme change listener
 	 */
-	useSystem(): PromiseLike<void> {
+	useSystem(): Promise<void> {
 		return this.systemThemeExtractor.getSystemTheme().then((value) => {
-			this.systemThemeExtractor.unsubscribe();
-			this.systemThemeExtractor.subscribe(
+			this.systemThemeExtractor.destroy();
+			this.systemThemeExtractor.onChange(
 				(value: string) => {
 					value = this.getThemeAlias(value);
 					void this.changeTheme({value, isSystem: true});
@@ -173,7 +173,7 @@ export default class ThemeManager extends Friend {
 		}
 
 		if (!isSystem) {
-			this.systemThemeExtractor.unsubscribe();
+			this.systemThemeExtractor.destroy();
 		}
 
 		const oldValue = this.current;