diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index ece4dbd..20fff36 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -1,10 +1,33 @@
+const { rules } = require("eslint-config-prettier")
+
 module.exports = {
 	root: true,
 	parser: "@typescript-eslint/parser",
 	extends: ["eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier"],
 	plugins: ["svelte3", "@typescript-eslint"],
-	ignorePatterns: ["*.cjs"],
-	overrides: [{ files: ["*.svelte"], processor: "svelte3/svelte3" }],
+
+	//(default) check *.svelte and *.ts files
+	// ignorePatterns: ["*.cjs"],
+
+	// check only *.svelte files
+	ignorePatterns: ["*.cjs", "*.ts"],
+
+	overrides: [
+		{
+			files: ["*.svelte"],
+			processor: "svelte3/svelte3",
+
+			// checking specific rules (set to "off" / "error")
+			// errors only
+			rules: {
+				"no-inferrable-types": "error",
+				"no-undef": "error",
+				"no-empty": "error",
+				"no-case-declarations": "error",
+				"no-prototype-builtins": "error"
+			}
+		}
+	],
 	settings: {
 		"svelte3/typescript": () => require("typescript")
 	},
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3ce50ae..a6adc10 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,4 +1,5 @@
 {
+	"eslint.validate": ["javascript", "svelte"],
 	"cSpell.enabled": false,
 	"editor.wordSeparators": "`~!@#%^&*()-=+[{]}\\|;:'\",.<>/?",
 	"todohighlight.keywords": [
diff --git a/package.json b/package.json
index a791ae3..a80fbbb 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
 		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
 		"lint": "prettier --check . && eslint .",
+		"lint : quiet": "prettier --check . && eslint --quiet .",
 		"format": "prettier --write ."
 	},
 	"devDependencies": {
diff --git a/src/lib/$app/env/index.ts b/src/lib/$app/env/index.ts
index f93c977..7111125 100644
--- a/src/lib/$app/env/index.ts
+++ b/src/lib/$app/env/index.ts
@@ -1,3 +1,3 @@
 // Mimic SvelteKit's `$app/env` foor non-SSR outputs in RollUp only and Vite only setups.
 
-export const browser: boolean = true
+export const browser = true
diff --git a/src/lib/ani/SvelthreeAnimationManager.ts b/src/lib/ani/SvelthreeAnimationManager.ts
index 7ecdda3..a9c5ca1 100644
--- a/src/lib/ani/SvelthreeAnimationManager.ts
+++ b/src/lib/ani/SvelthreeAnimationManager.ts
@@ -3,11 +3,13 @@ import SvelthreeAnimationProp from "./SvelthreeAnimationProp"
 import { verbose_mode } from "../utils/SvelthreeLogger"
 
 export default class SvelthreeAnimationManager {
+	//  TODO  (ESLint -> 'no-explicit-any') see https://github.com/vatro/svelthree/issues/165
 	animation: SvelthreeAnimationProp | any
 	aniauto: boolean
 	obj: Object3D
 	scene: Scene
 
+	//  TODO  (ESLint -> 'no-explicit-any') see https://github.com/vatro/svelthree/issues/165
 	constructor(animation: SvelthreeAnimationProp | any, aniauto: boolean, obj: Object3D, scene: Scene | null) {
 		this.animation = animation
 		this.aniauto = aniauto
@@ -165,6 +167,7 @@ export default class SvelthreeAnimationManager {
 		return false
 	}
 
+	//  TODO  (ESLint -> 'no-explicit-any') see https://github.com/vatro/svelthree/issues/165
 	getAnimation(): any {
 		if (this.animationInitiated()) {
 			return this.animation
diff --git a/src/lib/ani/SvelthreeAnimationProp.ts b/src/lib/ani/SvelthreeAnimationProp.ts
index bb3e35b..58029b9 100644
--- a/src/lib/ani/SvelthreeAnimationProp.ts
+++ b/src/lib/ani/SvelthreeAnimationProp.ts
@@ -14,14 +14,14 @@ export default class SvelthreeAnimationProp {
 		try {
 			initiatedFn = this.fn(obj, args)
 
-			if (!initiatedFn.hasOwnProperty("onStart")) {
+			if (!Object.prototype.hasOwnProperty.call(initiatedFn, "onStart")) {
 				console.error("SVELTHREE > Provided animation is missing 'onStart' function!", {
 					animation: initiatedFn
 				})
 				//throw new Error("SVELTHREE Exception (see warning above)")
 			}
 
-			if (!initiatedFn.hasOwnProperty("onDestroy")) {
+			if (!Object.prototype.hasOwnProperty.call(initiatedFn, "onDestroy")) {
 				console.error("SVELTHREE > Provided animation has no 'onDestroy' function!", {
 					animation: initiatedFn
 				})
diff --git a/src/lib/components-internal/SvelthreeInteraction.svelte b/src/lib/components-internal/SvelthreeInteraction.svelte
index b1913e4..c7e6e9a 100644
--- a/src/lib/components-internal/SvelthreeInteraction.svelte
+++ b/src/lib/components-internal/SvelthreeInteraction.svelte
@@ -13,6 +13,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 	import { onMount, beforeUpdate, afterUpdate, onDestroy, getContext } from "svelte"
 	import { get_current_component, SvelteComponentDev } from "svelte/internal"
 	import { Object3D, Raycaster, Vector3 } from "three"
+	import type { Intersection, Camera, Ray } from "three"
 	import { svelthreeStores } from "svelthree/stores"
 	import { c_dev, c_lc_int, verbose_mode, get_comp_name_int } from "../utils/SvelthreeLogger"
 	import type { LogLC, LogDEV } from "../utils/SvelthreeLogger"
@@ -49,7 +50,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 	const verbose: boolean = verbose_mode()
 
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = undefined
-	//export let log_rs: boolean = false
+	//export let log_rs = false
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = undefined
 
 	export let interactionEnabled: boolean
@@ -102,13 +103,13 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 
 	interface RaycasterData {
 		/** `intersections` are of the same form as those returned by [`.intersectObject`](https://threejs.org/docs/#api/en/core/Raycaster.intersectObject). */
-		intersection: { [P in keyof THREE.Intersection]: THREE.Intersection[P] }
+		intersection: { [P in keyof Intersection]: Intersection[P] }
 		/** Current `Raycaster` `.ray`, e.g. useful properties: `ray.origin: Vector3` | `ray.direction: Vector3`. */
-		ray: THREE.Ray
+		ray: Ray
 		/** The `Camera` used for raycasting. */
-		camera: THREE.Camera
+		camera: Camera
 		/** Current pointer position ( _'point' / Vector3 position_ ) in 3d world space. */
-		unprojected_point: THREE.Vector3
+		unprojected_point: Vector3
 	}
 
 	let raycaster_data: RaycasterData
@@ -145,7 +146,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 
 	export let shadow_dom_el: SvelthreeShadowDOMElement = undefined
 
-	let listeners: boolean = false
+	let listeners = false
 
 	// --- Reactively add listeners ---
 
@@ -156,7 +157,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 
 	// --- Pointer over / out of `<canvas>` element state ---
 
-	let out_of_canvas_triggered: boolean = false
+	let out_of_canvas_triggered = false
 
 	// pointer is out of / exited the `<canvas>` element.
 	$: if (obj.userData.interact && pointer.event && $pointer_over_canvas.status === false) {
@@ -802,21 +803,24 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 				if (cancel_or_stop_propagation_fn) cancel_or_stop_propagation_fn(e)
 
 				switch (e.type) {
-					case "pointermove":
+					case "pointermove": {
 						const queued_pointermove_event = () => dispatch_pointerevent_intersection_indep(e)
 						queued_pointer_move_events[0] = queued_pointermove_event
 						//queued_pointer_move_events[0] = () => dispatch_pointerevent_intersection_indep(e)
 						break
-					case "pointermoveover":
+					}
+					case "pointermoveover": {
 						const queued_pointermoveover_event = () => dispatch_pointerevent_intersection_indep(e)
 						queued_pointer_moveover_events[0] = queued_pointermoveover_event
 						//queued_pointer_moveover_events[0] = () => dispatch_pointerevent_intersection_indep(e)
 						break
-					default:
+					}
+					default: {
 						const queued_pointer_event = () => dispatch_pointerevent_intersection_dep(e)
 						pointer_events_queue.push(queued_pointer_event)
 						//pointer_events_queue.push(() => dispatch_pointerevent_intersection_dep(e))
 						break
+					}
 				}
 
 				break
@@ -840,7 +844,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 
 	/** intersection dependent -> has raycaster_data! */
 	function dispatch_pointerevent_intersection_dep(e: PointerEvent) {
-		const action_name: string = `on_${e.type}`
+		const action_name = `on_${e.type}`
 
 		const detail = {
 			e,
@@ -855,7 +859,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 
 	/** intersection independent -> no raycaster_data! */
 	function dispatch_pointerevent_intersection_indep(e: PointerEvent) {
-		const action_name: string = `on_${e.type}`
+		const action_name = `on_${e.type}`
 
 		const detail = {
 			e,
@@ -956,11 +960,12 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 		cancel_or_stop_propagation_fn(e)
 
 		switch (render_mode) {
-			case "always":
+			case "always": {
 				// QUEUED EVENT DISPATCHING: dispatch our custom event / execute handler on next render (raf aligned)
 				const queued_focus_event = () => dispatch_focusevent_intersection_indep(e)
 				focus_events_queue.push(queued_focus_event)
 				break
+			}
 			case "auto":
 				// IMMEDIATE EVENT DISPATCHING (not raf aligned) / any changes will schedule a new render (raf aligned)
 				dispatch_focusevent_intersection_indep(e)
@@ -972,7 +977,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 	}
 
 	function dispatch_focusevent_intersection_indep(e: FocusEvent) {
-		const action_name: string = `on_${e.type}`
+		const action_name = `on_${e.type}`
 
 		const detail = {
 			e,
@@ -1179,11 +1184,12 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 		}
 
 		switch (render_mode) {
-			case "always":
+			case "always": {
 				// QUEUED EVENT DISPATCHING: dispatch our custom event / execute handler on next render (raf aligned)
 				const queued_keyboard_event = () => dispatch_keyboardevent_intersection_indep(e)
 				keyboard_events_queue.push(queued_keyboard_event)
 				break
+			}
 			case "auto":
 				// IMMEDIATE EVENT DISPATCHING (not raf aligned) / any changes will schedule a new render (raf aligned)
 				dispatch_keyboardevent_intersection_indep(e)
@@ -1204,7 +1210,7 @@ This is a **svelthree** _SvelthreeInteraction_ Component.
 	}
 
 	function dispatch_keyboardevent_intersection_indep(e: KeyboardEvent) {
-		const action_name: string = `on_${e.type}`
+		const action_name = `on_${e.type}`
 
 		const detail = {
 			code: e.code,
diff --git a/src/lib/components/AmbientLight.svelte b/src/lib/components/AmbientLight.svelte
index 24d821f..701ff90 100644
--- a/src/lib/components/AmbientLight.svelte
+++ b/src/lib/components/AmbientLight.svelte
@@ -50,7 +50,7 @@ AmbientLight cannot be used to cast shadows as it doesn't have a direction. Posi
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -86,8 +86,8 @@ AmbientLight cannot be used to cast shadows as it doesn't have a direction. Posi
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -103,6 +103,7 @@ AmbientLight cannot be used to cast shadows as it doesn't have a direction. Posi
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "AmbientLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -201,6 +202,7 @@ AmbientLight cannot be used to cast shadows as it doesn't have a direction. Posi
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -284,7 +286,7 @@ AmbientLight cannot be used to cast shadows as it doesn't have a direction. Posi
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Canvas.svelte b/src/lib/components/Canvas.svelte
index 21be50a..dfa4652 100644
--- a/src/lib/components/Canvas.svelte
+++ b/src/lib/components/Canvas.svelte
@@ -43,15 +43,15 @@ This is a **svelthree** _Canvas_ Component.
 
 	const dispatch: (type: string, detail?: any) => void = createEventDispatcher()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
 
 	// #endregion
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_canvas: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_canvas = true
 
 	// #region --- Required Attributes
 
@@ -70,7 +70,7 @@ This is a **svelthree** _Canvas_ Component.
 	export { clazz as class }
 
 	/** If `true` (_default_) the cursor will change automatically (_e.g. over/out canvas DOM element, **interactive** objects or when using the `OrbitControls` component_). */
-	export let change_cursor: boolean = true
+	export let change_cursor = true
 
 	export let interactive: boolean = undefined
 	$: if (interactive !== undefined) {
@@ -570,7 +570,7 @@ This is a **svelthree** _Canvas_ Component.
 	 * will also check all descendants of interactive objects.
 	 * - If set to `false` the interaction Raycaster will only check intersection with interactive objects.
 	 */
-	export let recursive: boolean = true
+	export let recursive = true
 
 	/** Updates the `all_intersections.result` array and changes the pointer appearance if the `change_cursor` prop is set to `true`.*/
 	function update_all_intersections_and_cursor(): void {
@@ -732,6 +732,7 @@ This is a **svelthree** _Canvas_ Component.
 	// --- Accessabilty ---
 
 	export let tabindex: number = undefined
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (c && browser) {
diff --git a/src/lib/components/CubeCamera.svelte b/src/lib/components/CubeCamera.svelte
index 140ec75..85d47ac 100644
--- a/src/lib/components/CubeCamera.svelte
+++ b/src/lib/components/CubeCamera.svelte
@@ -66,7 +66,7 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -76,9 +76,9 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 	 * - `false` (default) -> `update_cubecam()` will be called **once on initialization**, further updates have to be done **manually** by calling `[CubeCamera component reference].update_cubecam()`.
 	 * - `true` -> WebGLRenderer component will update the CubeCamera (_renderTarget.texture_) on **every frame**.
 	 */
-	export let dynamic: boolean = false
+	export let dynamic = false
 
-	let camera_updated: boolean = false
+	let camera_updated = false
 
 	/** `CubeCamera` instances are always added to the `root_scene`
 	 * no matter which component the `CubeCamera` component was added to. */
@@ -119,7 +119,7 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 	$: texture = browser ? camera.renderTarget.texture : undefined
 
 	/** Set to `true` for correct **floor reflections** (_default: `false`_). */
-	export let is_floor: boolean = false
+	export let is_floor = false
 
 	let scene: THREE_Scene = getContext("scene")
 	const sti: number = getContext("store_index")
@@ -156,8 +156,8 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 	export let name: string = undefined
 	let index_in_cubecameras: number = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_camera: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_camera = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -306,6 +306,7 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -403,7 +404,7 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 		if (!bind_tex) {
 			let op: Mesh = bound_pos as Mesh
 			let op_mat: MaterialWithEnvMap = op.material as MaterialWithEnvMap
-			if (op_mat?.hasOwnProperty("envMap")) {
+			if (op_mat && Object.prototype.hasOwnProperty.call(op_mat, "envMap")) {
 				op_mat.envMap = camera.renderTarget.texture
 			}
 		}
@@ -602,7 +603,7 @@ Renders a `CubeMap` which can be used with **non-PBR** materials having an `.env
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/DirectionalLight.svelte b/src/lib/components/DirectionalLight.svelte
index d666c4a..8967af8 100644
--- a/src/lib/components/DirectionalLight.svelte
+++ b/src/lib/components/DirectionalLight.svelte
@@ -61,7 +61,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -97,8 +97,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -114,6 +114,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "DirectionalLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -212,6 +213,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -425,7 +427,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Group.svelte b/src/lib/components/Group.svelte
index 0f7f193..cf01127 100644
--- a/src/lib/components/Group.svelte
+++ b/src/lib/components/Group.svelte
@@ -55,13 +55,13 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
 	export let log_mau: boolean = log_all
 
-	export const isGroup: boolean = true
+	export const isGroup = true
 	let scene: THREE_Scene = getContext("scene")
 	const sti: number = getContext("store_index")
 
@@ -98,8 +98,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_group: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_group = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -115,6 +115,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (group.type === "Group") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'group' instance has wrong type '${group.type}', should be '${c_name}'!`
@@ -206,6 +207,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -415,7 +417,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/HemisphereLight.svelte b/src/lib/components/HemisphereLight.svelte
index 1b4543f..e7ab716 100644
--- a/src/lib/components/HemisphereLight.svelte
+++ b/src/lib/components/HemisphereLight.svelte
@@ -51,7 +51,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -87,8 +87,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -104,6 +104,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "HemisphereLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -202,6 +203,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -328,7 +330,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/LoadedGLTF.svelte b/src/lib/components/LoadedGLTF.svelte
index dd25654..2dfcec3 100644
--- a/src/lib/components/LoadedGLTF.svelte
+++ b/src/lib/components/LoadedGLTF.svelte
@@ -73,7 +73,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -115,8 +115,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_container: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_container = true
 
 	$: if (!container) {
 		container = new THREE_Object3D()
@@ -185,6 +185,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -205,7 +206,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	 * which will then be added to it's parent component / parent object (three) instance.
 	 * If the `add` attribute is set to `false`, the `container` instance will be `undefined`
 	 * and you'll have to manage adding loaded GLTF assets to your scene graph by yourself. */
-	export let add: boolean = true
+	export let add = true
 
 	/** GLTF file `url` (_or path_). */
 	export let url: string = undefined
@@ -484,7 +485,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	* In case `interact` prop is set / set to `true`, but no e.g. `on:<event_name>` directives or `on_<event_name>` internal actions are set,
 	* the object will automatically become an _interaction occluder / blocker_.
    */
-	export let block: boolean = false
+	export let block = false
 
 	const interaction_on_clear = {
 		interact: undefined,
@@ -691,7 +692,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Mesh.svelte b/src/lib/components/Mesh.svelte
index 9a023af..af34e75 100644
--- a/src/lib/components/Mesh.svelte
+++ b/src/lib/components/Mesh.svelte
@@ -71,7 +71,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -129,8 +129,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	export let geometry: BufferGeometry = undefined
 	let geometry_ref: BufferGeometry = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_mesh: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_mesh = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -358,6 +358,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -623,7 +624,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	* In case `interact` prop is set / set to `true`, but no e.g. `on:<event_name>` directives or `on_<event_name>` internal actions are set,
 	* the object will automatically become an _interaction occluder / blocker_.
    */
-	export let block: boolean = false
+	export let block = false
 
 	const interaction_on_clear = {
 		interact: undefined,
@@ -830,7 +831,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Object3D.svelte b/src/lib/components/Object3D.svelte
index 800b2eb..ead526d 100644
--- a/src/lib/components/Object3D.svelte
+++ b/src/lib/components/Object3D.svelte
@@ -54,13 +54,13 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
 	export let log_mau: boolean = log_all
 
-	export const isObject3D: boolean = true
+	export const isObject3D = true
 	let scene: THREE_Scene = getContext("scene")
 	const sti: number = getContext("store_index")
 
@@ -97,8 +97,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_object3d: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_object3d = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -114,6 +114,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (object3d.type === "Object3D") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'object3d' instance has wrong type '${object3d.type}', should be '${c_name}'!`
@@ -205,6 +206,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -415,7 +417,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/OrbitControls.svelte b/src/lib/components/OrbitControls.svelte
index 49e6e8e..03deb71 100644
--- a/src/lib/components/OrbitControls.svelte
+++ b/src/lib/components/OrbitControls.svelte
@@ -38,7 +38,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
 
@@ -48,11 +48,11 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Returns the `orbitcontrols` instance created by the component & allows providing (_injection_) of (_already created / premade_) `THREE.OrbitControls` instances. */
 	export let orbitcontrols: THREE_OrbitControls = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_orbitcontrols: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_orbitcontrols = true
 
 	/** Display a console warning if the `OrbitControls` component's `cam` attribute was assigned a currently _inactive_ camera (also adss a `CameraHelper` to the assigned Camera). Default is `true`. Set `warn={false}` to hide the warning (_also: no `CameraHelper` be added_). */
-	export let warn: boolean = true
+	export let warn = true
 
 	// TODO  clarify why / when we would need this.
 	let index_in_orbitcontrols: number = undefined
@@ -167,7 +167,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	/** When set to false, the controls will not respond to user input. Default is `true`.
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.enabled) */
-	export let enabled: boolean = true
+	export let enabled = true
 	$: if (orbitcontrols && (enabled === true || !enabled)) set_enabled()
 
 	function set_enabled(): void {
@@ -187,7 +187,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	/** Enable or disable horizontal and vertical rotation of the camera. Default `true`.
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.enableRotate) */
-	export let rotate: boolean = true
+	export let rotate = true
 	$: if (orbitcontrols && (rotate === true || !rotate)) set_rotate()
 
 	function set_rotate(): void {
@@ -201,7 +201,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	 *     - `false`: will schedule a render on `OrbitControls`'s event `"change"`.
 	 *
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.autoRotate) */
-	export let auto: boolean = false
+	export let auto = false
 	$: if (orbitcontrols && auto !== undefined) set_auto()
 
 	function set_auto(): void {
@@ -234,7 +234,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	/** Set to true to enable damping (inertia), which can be used to give a sense of weight to the controls. Default is `false`.
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.enableDamping) */
-	export let damping: boolean = false
+	export let damping = false
 	$: if (orbitcontrols && (damping === true || !damping)) set_damping()
 
 	function set_damping(): void {
@@ -244,7 +244,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	/** Enable or disable camera panning. Default is `true`.
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.enablePan) */
-	export let pan: boolean = true
+	export let pan = true
 	$: if (orbitcontrols && (pan === true || !pan)) set_pan()
 
 	function set_pan(): void {
@@ -254,7 +254,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	/** Enable or disable zooming (dollying) of the camera. Default `false`.
 	 * [See threejs-docs.](https://threejs.org/docs/#examples/en/controls/OrbitControls.enableZoom) */
-	export let zoom: boolean = false
+	export let zoom = false
 	$: if (orbitcontrols && (zoom === true || !zoom)) set_zoom()
 
 	function set_zoom(): void {
diff --git a/src/lib/components/OrthographicCamera.svelte b/src/lib/components/OrthographicCamera.svelte
index 0558612..1407edb 100644
--- a/src/lib/components/OrthographicCamera.svelte
+++ b/src/lib/components/OrthographicCamera.svelte
@@ -61,7 +61,7 @@ If you use this approach you'll see a warning in the console if you define left,
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -111,8 +111,8 @@ If you use this approach you'll see a warning in the console if you define left,
 	let camera_is_active: boolean = undefined
 	let index_in_cameras: number = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_camera: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_camera = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -279,6 +279,7 @@ If you use this approach you'll see a warning in the console if you define left,
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -428,7 +429,7 @@ If you use this approach you'll see a warning in the console if you define left,
 
 	const canvas_dim: Writable<{ w: number; h: number }> = getContext("canvas_dim")
 
-	let camera_updated_on_init: boolean = false
+	let camera_updated_on_init = false
 
 	// update frustum planes / aspect on initialization only (`frustumSize` not set -> svelthree default value in order prevent 'stretching')
 	$: if (!frustumSize && !camera_updated_on_init && camera && $canvas_dom.element && $canvas_dim.w && $canvas_dim.h) {
@@ -510,7 +511,7 @@ If you use this approach you'll see a warning in the console if you define left,
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/PerspectiveCamera.svelte b/src/lib/components/PerspectiveCamera.svelte
index 1e1b854..889e04d 100644
--- a/src/lib/components/PerspectiveCamera.svelte
+++ b/src/lib/components/PerspectiveCamera.svelte
@@ -54,7 +54,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -104,8 +104,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	let camera_is_active: boolean = undefined
 	let index_in_cameras: number = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_camera: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_camera = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -244,6 +244,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -393,7 +394,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const canvas_dim: Writable<{ w: number; h: number }> = getContext("canvas_dim")
 
-	let aspect_updated_on_init: boolean = false
+	let aspect_updated_on_init = false
 
 	/** Camera frustum aspect ratio, usually the `canvas width / canvas height`.
 	 * **svelthree** always sets the aspect of the camera automatically _once_ on initialization to match canvas dimensions.
@@ -544,7 +545,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/PointLight.svelte b/src/lib/components/PointLight.svelte
index c589b45..2c50b60 100644
--- a/src/lib/components/PointLight.svelte
+++ b/src/lib/components/PointLight.svelte
@@ -58,7 +58,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -94,8 +94,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -111,6 +111,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "PointLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -209,6 +210,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -390,7 +392,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Points.svelte b/src/lib/components/Points.svelte
index 6e5686f..9355348 100644
--- a/src/lib/components/Points.svelte
+++ b/src/lib/components/Points.svelte
@@ -71,7 +71,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -129,8 +129,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	export let geometry: BufferGeometry = undefined
 	let geometry_ref: BufferGeometry = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_points: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_points = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -146,6 +146,13 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (points.type === "Points") {
+			if (!points.geometry) {
+				throw new Error(`SVELTHREE > ${c_name} : provided 'points' instance has no geometry!`)
+			}
+
+			if (!points.material) {
+				throw new Error(`SVELTHREE > ${c_name} : provided 'points' instance has no material!`)
+			}
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'points' instance has wrong type '${points.type}', should be '${c_name}'!`
@@ -351,6 +358,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -616,7 +624,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	* In case `interact` prop is set / set to `true`, but no e.g. `on:<event_name>` directives or `on_<event_name>` internal actions are set,
 	* the object will automatically become an _interaction occluder / blocker_.
    */
-	export let block: boolean = false
+	export let block = false
 
 	const interaction_on_clear = {
 		interact: undefined,
@@ -823,7 +831,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/RectAreaLight.svelte b/src/lib/components/RectAreaLight.svelte
index 0f90c5f..2d97e3a 100644
--- a/src/lib/components/RectAreaLight.svelte
+++ b/src/lib/components/RectAreaLight.svelte
@@ -55,7 +55,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -91,8 +91,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -108,6 +108,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "RectAreaLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -132,7 +133,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 		if (browser) create_shadow_dom()
 	}
 
-	let ral_ulib_initiated: boolean = false
+	let ral_ulib_initiated = false
 	$: if (!ral_ulib_initiated) {
 		ral_ulib_initiated = true
 		RectAreaLightUniformsLib.init()
@@ -212,6 +213,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -405,7 +407,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/Scene.svelte b/src/lib/components/Scene.svelte
index d4da73c..9a9e325 100644
--- a/src/lib/components/Scene.svelte
+++ b/src/lib/components/Scene.svelte
@@ -72,7 +72,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -120,8 +120,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	export let name: string = undefined
 	let scene_is_active: boolean = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_scene: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_scene = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -137,6 +137,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (scene.type === "Scene") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'scene' instance has wrong type '${scene.type}', should be '${c_name}'!`
@@ -261,6 +262,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -612,7 +614,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	* In case `interact` prop is set / set to `true`, but no e.g. `on:<event_name>` directives or `on_<event_name>` internal actions are set,
 	* the object will automatically become an _interaction occluder / blocker_.
    */
-	export let block: boolean = false
+	export let block = false
 
 	const interaction_on_clear = {
 		interact: undefined,
@@ -819,7 +821,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/SpotLight.svelte b/src/lib/components/SpotLight.svelte
index 12920d8..b9e2dff 100644
--- a/src/lib/components/SpotLight.svelte
+++ b/src/lib/components/SpotLight.svelte
@@ -61,7 +61,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -97,8 +97,8 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Sets the `name` property of the created / injected three.js instance. */
 	export let name: string = undefined
 
-	export const is_svelthree_component: boolean = true
-	export const is_svelthree_light: boolean = true
+	export const is_svelthree_component = true
+	export const is_svelthree_light = true
 
 	//  ONCE  ON  INITIALIZATION  //
 
@@ -114,6 +114,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Executed when / if an instance was provided **on initializiation** -> only once if at all! */
 	function on_instance_provided(): void {
 		if (light.type === "SpotLight") {
+			//nothing
 		} else {
 			throw new Error(
 				`SVELTHREE > ${c_name} provided 'light' instance has wrong type '${light.type}', should be '${c_name}'!`
@@ -212,6 +213,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	}
 
 	// accessability -> shadow dom wai-aria
+	// eslint-disable-next-line no-undef
 	export let aria: Partial<ARIAMixin> = undefined
 
 	$: if (shadow_dom_el && aria !== undefined) {
@@ -469,7 +471,7 @@ svelthree uses svelte-accmod, where accessors are always `true`, regardless of `
 	/** Animation logic to be performed with the (three) object instance created by the component. */
 	export let animation: SvelthreeAnimationFunction = undefined
 
-	let animationEnabled: boolean = false
+	let animationEnabled = false
 	$: if (animation) animationEnabled = true
 
 	/** Immediately start provided animation, default: `false`. Alternative: `<component_reference>.start_animation()` or shorter `.start_ani()`. */
diff --git a/src/lib/components/WebGLRenderer.svelte b/src/lib/components/WebGLRenderer.svelte
index b44cdb4..7599739 100644
--- a/src/lib/components/WebGLRenderer.svelte
+++ b/src/lib/components/WebGLRenderer.svelte
@@ -33,7 +33,7 @@ This is a **svelthree** _WebGLRenderer_ Component.
 	export const type: string = c_name
 	const verbose: boolean = verbose_mode()
 
-	export let log_all: boolean = false
+	export let log_all = false
 	export let log_dev: { [P in keyof LogDEV]: LogDEV[P] } = log_all ? { all: true } : undefined
 	export let log_rs: boolean = log_all
 	export let log_lc: { [P in keyof LogLC]: LogLC[P] } = log_all ? { all: true } : undefined
@@ -76,7 +76,7 @@ This is a **svelthree** _WebGLRenderer_ Component.
 	 * An array of configuration objects specifying `Canvas` components incl. `Scene` and `Camera` components' `id`s that should be rendered.
 	 */
 	export let inputs: WebGLRendererInput[] = undefined
-	let inputs_processed: boolean = false
+	let inputs_processed = false
 	const canvas_dom: Writable<{ element: HTMLCanvasElement }> = getContext("canvas_dom")
 
 	// inside -> wait for canvas...
@@ -146,7 +146,7 @@ This is a **svelthree** _WebGLRenderer_ Component.
 
 	/** An array of `Canvas` components or `<canvas>` DOM elements to rendered to. */
 	export let outputs: WebGLRendererOutput[] = undefined
-	let outputs_processed: boolean = false
+	let outputs_processed = false
 	let first_outputs_canvas: HTMLCanvasElement | HTMLElement = undefined
 	$: if (outputs?.length && outputs[0].canvas) first_outputs_canvas = outputs[0].canvas
 	$: if (inside === false && first_outputs_canvas && inputs_processed) process_canvas_outputs()
@@ -534,7 +534,7 @@ This is a **svelthree** _WebGLRenderer_ Component.
 	const rAF = { id: undefined }
 	const frames = { total: 0 }
 
-	export let enabled: boolean = true
+	export let enabled = true
 
 	function start_renderer(): void {
 		if (verbose && log_dev) console.debug(...c_dev(c_name, "start_renderer!"))
diff --git a/src/lib/constants/LogCSS.ts b/src/lib/constants/LogCSS.ts
index 48a89d3..5dc8c34 100644
--- a/src/lib/constants/LogCSS.ts
+++ b/src/lib/constants/LogCSS.ts
@@ -1,16 +1,16 @@
 export default class LogCSS {
-	public static PREFIX_ON_MOUNT: string = "☰"
-	public static PREFIX_BEFORE_UPDATE: string = "~"
-	public static PREFIX_AFTER_UPDATE: string = "✓"
+	public static PREFIX_ON_MOUNT = "☰"
+	public static PREFIX_BEFORE_UPDATE = "~"
+	public static PREFIX_AFTER_UPDATE = "✓"
 
-	public static REACTIVE_STATEMENT: string = "color:red; font-weight:bold;"
-	public static BEFORE_UPDATE: string =
+	public static REACTIVE_STATEMENT = "color:red; font-weight:bold;"
+	public static BEFORE_UPDATE =
 		"font-weight:bold; color: #A5F3FC; background: #4B5563; padding: 2px 4px; border: 1px solid #4B5563; border-radius: 6px;"
-	public static AFTER_UPDATE: string =
+	public static AFTER_UPDATE =
 		"font-weight:bold; background: #4B5563; color: #BBF7D0; padding: 2px 4px; border: 1px solid #4B5563; border-radius: 6px;"
-	public static ON_MOUNT: string =
+	public static ON_MOUNT =
 		"font-weight:bold; background: #4B5563; color: white; padding: 2px 4px; border: 1px solid #4B5563; border-radius: 6px;"
 
-	public static DEV_DEBUG: string = "font-weight:normal"
-	public static FEATURE_MAU: string = "font-weight:normal"
+	public static DEV_DEBUG = "font-weight:normal"
+	public static FEATURE_MAU = "font-weight:normal"
 }
diff --git a/src/lib/types/types-extra.ts b/src/lib/types/types-extra.ts
index a94b175..b3f417c 100644
--- a/src/lib/types/types-extra.ts
+++ b/src/lib/types/types-extra.ts
@@ -6,8 +6,6 @@ export type Constructor<T = object> = {
 export type Array3 = [number, number, number]
 export type Array4 = [number, number, number, string]
 
-export type Params<T> = T extends new (...params: any) => any ? ConstructorParameters<T> : T
-
 // see https://stackoverflow.com/questions/49579094/typescript-conditional-types-filter-out-readonly-properties-pick-only-requir
 export type IfEquals<X, Y, A = X, B = never> = (<T>() => T extends X ? 1 : 2) extends <T>() => T extends Y ? 1 : 2
 	? A
@@ -83,6 +81,7 @@ export interface SvelthreeAnimationFunctionReturn {
 	 * _Usually used for continuing the animation in a multiple top-level Scenes scenario._
 	 */
 	onSceneReactivated?: () => void
+	//  TODO  (ESLint -> 'no-explicit-any') see https://github.com/vatro/svelthree/issues/165
 	[anything: string]: any
 }
 
@@ -114,6 +113,7 @@ export interface SvelthreeAnimationFunctionReturn {
  */
 /*eslint @typescript-eslint/no-explicit-any: ["error", { "ignoreRestArgs": true }]*/
 export interface SvelthreeAnimationFunction {
+	//  TODO  (ESLint -> 'no-explicit-any') see https://github.com/vatro/svelthree/issues/165
 	(obj: any, ...args: any[]): SvelthreeAnimationFunctionReturn
 }
 
diff --git a/src/lib/utils/Calc.ts b/src/lib/utils/Calc.ts
index cb5e332..56b2676 100644
--- a/src/lib/utils/Calc.ts
+++ b/src/lib/utils/Calc.ts
@@ -2,14 +2,12 @@ import { Vector3 } from "three"
 import type { PerspectiveCamera, OrthographicCamera } from "three"
 
 export default class Calc {
-	constructor() {}
-
 	public static get_unproject_pointer(
 		c: HTMLCanvasElement,
 		e: PointerEvent,
 		cam: PerspectiveCamera | OrthographicCamera
 	): Vector3 {
-		let rect: DOMRect = c.getBoundingClientRect()
+		const rect: DOMRect = c.getBoundingClientRect()
 
 		const px = ((e.clientX - rect.left) / (rect.right - rect.left)) * 2 - 1
 		const py = -((e.clientY - rect.top) / (rect.bottom - rect.top)) * 2 + 1
@@ -18,19 +16,19 @@ export default class Calc {
 			// Perspective Camera
 			// see: https://stackoverflow.com/questions/13055214/mouse-canvas-x-y-to-three-js-world-x-y-z
 
-			let v: Vector3 = new Vector3(px, py, 0.5)
-			let t: Vector3 = new Vector3()
+			const v: Vector3 = new Vector3(px, py, 0.5)
+			const t: Vector3 = new Vector3()
 
 			v.unproject(cam)
 			v.sub(cam.position).normalize()
-			let d = -cam.position.z / v.z
+			const d = -cam.position.z / v.z
 			//let d = ( unproject_z - cam.position.z ) / v.z
 			t.copy(cam.position).add(v.multiplyScalar(d))
 
 			return t
 		} else if (cam.type === "OrthographicCamera") {
-			let vz: number = (cam.near + cam.far) / (cam.near - cam.far)
-			let v: Vector3 = new Vector3(px, py, vz)
+			const vz: number = (cam.near + cam.far) / (cam.near - cam.far)
+			const v: Vector3 = new Vector3(px, py, vz)
 			v.unproject(cam).sub(cam.position)
 
 			return v
diff --git a/src/lib/utils/CameraUtils.ts b/src/lib/utils/CameraUtils.ts
index d0d0de2..d2ee741 100644
--- a/src/lib/utils/CameraUtils.ts
+++ b/src/lib/utils/CameraUtils.ts
@@ -41,10 +41,10 @@ export default class CameraUtils {
 			// abilty to have (blank)
 			//const _frustumSize = frustumSize || CameraValues.CAM_ORTHO_FRUSTUM_SIZE
 
-			let left = (frustumSize * aspect) / -2
-			let right = (frustumSize * aspect) / 2
-			let top = frustumSize / 2
-			let bottom = frustumSize / -2
+			const left = (frustumSize * aspect) / -2
+			const right = (frustumSize * aspect) / 2
+			const top = frustumSize / 2
+			const bottom = frustumSize / -2
 
 			cam.left = left
 			cam.right = right
diff --git a/src/lib/utils/CubeCameraHelper.ts b/src/lib/utils/CubeCameraHelper.ts
index 2a3844f..3ce8ee6 100644
--- a/src/lib/utils/CubeCameraHelper.ts
+++ b/src/lib/utils/CubeCameraHelper.ts
@@ -9,10 +9,10 @@ export default class CubeCameraHelper {
 	}
 
 	private createHelpers(camera: CubeCamera): CameraHelper[] {
-		let all: CameraHelper[] = []
+		const all: CameraHelper[] = []
 		for (let i = 0; i < camera.children.length; i++) {
-			let pc: PerspectiveCamera = (camera.children as PerspectiveCamera[])[i]
-			let helper = new CameraHelper(pc)
+			const pc: PerspectiveCamera = (camera.children as PerspectiveCamera[])[i]
+			const helper = new CameraHelper(pc)
 			all.push(helper)
 		}
 		return all
diff --git a/src/lib/utils/GLTF_afterLoaded.ts b/src/lib/utils/GLTF_afterLoaded.ts
index cc327b9..1d37271 100644
--- a/src/lib/utils/GLTF_afterLoaded.ts
+++ b/src/lib/utils/GLTF_afterLoaded.ts
@@ -57,7 +57,7 @@ export default class GLTF_afterLoaded {
 					if (obj[typ]) {
 						// see https://github.com/mrdoob/three.js/blob/1a241ef10048770d56e06d6cd6a64c76cc720f95/src/core/Object3D.js#L342-L369
 						if (parent) {
-							let index_to_remove: number = parent.children.indexOf(obj)
+							const index_to_remove: number = parent.children.indexOf(obj)
 							//console.log(`removing -> [${index_to_remove}] ${obj.type}`, obj.uuid)
 							parent.children.splice(index_to_remove, 1)
 						}
@@ -70,7 +70,7 @@ export default class GLTF_afterLoaded {
 				}
 			}
 
-			function traverse(child: Object3D, parent?: Object3D) {
+			const traverse = (child: Object3D, parent?: Object3D) => {
 				fns.push(check_obj(child, parent, typ))
 				const children = child.children
 				for (let i = 0, l = children.length; i < l; i++) {
@@ -106,7 +106,7 @@ export default class GLTF_afterLoaded {
 				(obj: Object3D, props: { [P in keyof AnyMeshMaterialProps]: AnyMeshMaterialProps[P] }) => async () => {
 					if (obj) {
 						if (obj["isMesh"] && obj["material"]) {
-							for (let prop in props) {
+							for (const prop in props) {
 								try {
 									obj["material"][prop] = props[prop]
 								} catch (e) {
@@ -122,7 +122,10 @@ export default class GLTF_afterLoaded {
 					}
 				}
 
-			function traverse(child: Object3D, props: { [P in keyof AnyMeshMaterialProps]: AnyMeshMaterialProps[P] }) {
+			const traverse = (
+				child: Object3D,
+				props: { [P in keyof AnyMeshMaterialProps]: AnyMeshMaterialProps[P] }
+			) => {
 				fns.push(check_obj(child, props))
 				const children = child.children
 				for (let i = 0, l = children.length; i < l; i++) {
@@ -159,7 +162,7 @@ export default class GLTF_afterLoaded {
 				(obj: Object3D, props: { [P in keyof MeshProperties]: MeshProperties[P] }) => async () => {
 					if (obj) {
 						if (obj["isMesh"]) {
-							for (let prop in props) {
+							for (const prop in props) {
 								try {
 									obj[prop] = props[prop]
 								} catch (e) {
@@ -175,7 +178,7 @@ export default class GLTF_afterLoaded {
 					}
 				}
 
-			function traverse(child: Object3D, props: { [P in keyof MeshProperties]: MeshProperties[P] }) {
+			const traverse = (child: Object3D, props: { [P in keyof MeshProperties]: MeshProperties[P] }) => {
 				fns.push(check_obj(child, props))
 				const children = child.children
 				for (let i = 0, l = children.length; i < l; i++) {
@@ -211,7 +214,7 @@ export default class GLTF_afterLoaded {
 			const check_obj = (obj: Object3D, props: { [P in keyof AnyLightProps]: AnyLightProps[P] }) => async () => {
 				if (obj) {
 					if (obj["isLight"]) {
-						for (let prop in props) {
+						for (const prop in props) {
 							try {
 								obj[prop] = props[prop]
 							} catch (e) {
@@ -227,7 +230,7 @@ export default class GLTF_afterLoaded {
 				}
 			}
 
-			function traverse(child: Object3D, props: { [P in keyof AnyLightProps]: AnyLightProps[P] }) {
+			const traverse = (child: Object3D, props: { [P in keyof AnyLightProps]: AnyLightProps[P] }) => {
 				fns.push(check_obj(child, props))
 				const children = child.children
 				for (let i = 0, l = children.length; i < l; i++) {
diff --git a/src/lib/utils/GLTF_utils.ts b/src/lib/utils/GLTF_utils.ts
index 87090df..59aff9a 100644
--- a/src/lib/utils/GLTF_utils.ts
+++ b/src/lib/utils/GLTF_utils.ts
@@ -96,7 +96,7 @@ export default class GLTF_utils {
 				}
 			}
 
-			function traverse(child: Object3D) {
+			const traverse = (child: Object3D) => {
 				fns.push(check_obj(child, check, found))
 				const children = child.children
 				for (let i = 0, l = children.length; i < l; i++) {
diff --git a/src/lib/utils/LightTarget.ts b/src/lib/utils/LightTarget.ts
index 02fb34f..ec32a6a 100644
--- a/src/lib/utils/LightTarget.ts
+++ b/src/lib/utils/LightTarget.ts
@@ -18,7 +18,7 @@ export default class LightTarget {
 	public on_light_target_change() {
 		this.change = false
 
-		if (this.light.hasOwnProperty("target")) {
+		if (Object.prototype.hasOwnProperty.call(this.light, "target")) {
 			// remove current target from parent if it's a built-in target
 			if (this.light["target"]?.userData.is_builtin_target && this.light["target"].parent) {
 				this.light["target"].parent.remove(this.light["target"])
diff --git a/src/lib/utils/PropUtils.ts b/src/lib/utils/PropUtils.ts
index ce2904b..9d4a827 100644
--- a/src/lib/utils/PropUtils.ts
+++ b/src/lib/utils/PropUtils.ts
@@ -16,7 +16,7 @@ import { verbose_mode, log_prop_utils } from "../utils/SvelthreeLogger"
  */
 export default class PropUtils {
 	public static getShortHandAttrWarnings(prefix: string): { [key: string]: any } {
-		let warnings = {
+		const warnings = {
 			rot: `${prefix} 'rot' attribute ignored! : overridden by either 'matrix' or 'quat' attribute!`,
 			pos: `${prefix} 'pos' attribute ignored! : overridden by 'matrix' attribute!`,
 			quat: `${prefix} 'quat' attribute ignored! : overridden by 'matrix' attribute!`,
@@ -329,7 +329,7 @@ export default class PropUtils {
 			// limit using manipulating `target` via `lookAt` to lights only
 			if (obj["isLight"]) {
 				// THREE  IMPORTANT  Only DirectionalLight and SpotLight have own `target` properties. Object3D does not.
-				if (obj.hasOwnProperty("target")) {
+				if (Object.prototype.hasOwnProperty.call(obj, "target")) {
 					if (obj["target"].isObject3D) {
 						if (obj.matrixAutoUpdate === false) {
 							obj["target"].matrixAutoUpdate = false
@@ -532,7 +532,7 @@ export default class PropUtils {
 			if (val["isObject3D"]) {
 				obj["target"] = val
 			} else if (val["is_svelthree_component"]) {
-				let obj3d: Object3D = (val as TargetableSvelthreeComponent).get_instance()
+				const obj3d: Object3D = (val as TargetableSvelthreeComponent).get_instance()
 				obj["target"] = obj3d
 			} else {
 				console.error(`[ PropUtils ] -> setLightTarget : invalid 'target' value!`, { val })
diff --git a/src/lib/utils/PropUtilsComplex.ts b/src/lib/utils/PropUtilsComplex.ts
deleted file mode 100644
index 1f9437a..0000000
--- a/src/lib/utils/PropUtilsComplex.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import type { ComplexValueType } from "../types/types-extra"
-
-export default class PropUtilsComplex {
-	public static check(complex: ComplexValueType) {
-		switch (complex) {
-			case "Array3Nums":
-				break
-			default:
-				break
-		}
-	}
-
-	public static checkArray3Nums() {}
-}
diff --git a/src/lib/utils/Propeller.ts b/src/lib/utils/Propeller.ts
index 4e49f56..2c73574 100644
--- a/src/lib/utils/Propeller.ts
+++ b/src/lib/utils/Propeller.ts
@@ -63,7 +63,7 @@ export default class Propeller {
 				default:
 					// update `CubeCamera`'s `renderTargetProps` prop (`CubeTexture`)
 					if (obj_type === "WebGLCubeRenderTarget") {
-						let cubeRenderTarget = obj as WebGLCubeRenderTarget
+						const cubeRenderTarget = obj as WebGLCubeRenderTarget
 						PropUtils.applyValueToProp(cubeRenderTarget.texture, value, key)
 					} else {
 						// no wildcard updating of **inherited** properties  via `Proppeller` -> show error in the console.
diff --git a/src/lib/utils/RaycastArray.ts b/src/lib/utils/RaycastArray.ts
index 1cc7c31..6a41432 100644
--- a/src/lib/utils/RaycastArray.ts
+++ b/src/lib/utils/RaycastArray.ts
@@ -4,7 +4,7 @@ import type { RaycastableSvelthreeComponents } from "../types/types-extra"
 class RaycastArray_Base extends Array {
 	public head_path?: string[] | undefined = undefined
 	public index_prop: string | undefined = undefined
-	public dirty: boolean = false
+	public dirty = false
 
 	constructor(...args: any[]) {
 		super(...args)
diff --git a/src/lib/utils/RendererUtils.svelte b/src/lib/utils/RendererUtils.svelte
index 3531cbd..ac05794 100644
--- a/src/lib/utils/RendererUtils.svelte
+++ b/src/lib/utils/RendererUtils.svelte
@@ -7,7 +7,7 @@
 		renderer_component: WebGLRenderer,
 		event_name: string,
 		callback: () => void,
-		skip_frames: number = 0
+		skip_frames = 0
 	) => {
 		let skip = 0
 		let remove_on_render_event: () => void = undefined
diff --git a/src/lib/utils/SvelthreeProps.ts b/src/lib/utils/SvelthreeProps.ts
index c21ffb4..51aef4c 100644
--- a/src/lib/utils/SvelthreeProps.ts
+++ b/src/lib/utils/SvelthreeProps.ts
@@ -125,7 +125,7 @@ export default class SvelthreeProps {
 		this.updatedKeys = []
 
 		// analyze and sort `props` object's properties
-		for (let k in props) {
+		for (const k in props) {
 			const complexType: ComplexValueType | undefined = PropUtils.checkIfComplexValueType(props[k])
 			const is_own_prop: any = has_prop(this.obj, k)
 			const is_inherited_prop: boolean = is_own_prop ? false : this.obj[k] ? true : false
diff --git a/src/lib/utils/props/PropColorX.ts b/src/lib/utils/props/PropColorX.ts
index ae49912..d24dc6c 100644
--- a/src/lib/utils/props/PropColorX.ts
+++ b/src/lib/utils/props/PropColorX.ts
@@ -20,7 +20,7 @@ export default class PropColorX {
 
 			case value:
 				// same object, perform deep check
-				for (let k in this.prevValues) {
+				for (const k in this.prevValues) {
 					if (not_equal(this.prevValues[k], value[k])) {
 						Propeller.update(obj, this.obj_type, this.key, value, this.origin, "Color")
 						this.setPrevValues(value)
diff --git a/src/lib/utils/props/PropEulerX.ts b/src/lib/utils/props/PropEulerX.ts
index 6f006ec..aa353c9 100644
--- a/src/lib/utils/props/PropEulerX.ts
+++ b/src/lib/utils/props/PropEulerX.ts
@@ -20,7 +20,7 @@ export default class PropEulerX {
 
 			case value:
 				// same object, perform deep check
-				for (let k in this.prevValues) {
+				for (const k in this.prevValues) {
 					if (not_equal(this.prevValues[k], value[k])) {
 						Propeller.update(obj, this.obj_type, this.key, value, this.origin, "Euler")
 						this.setPrevValues(value)
diff --git a/src/lib/utils/props/PropQuaternionX.ts b/src/lib/utils/props/PropQuaternionX.ts
index 53747e5..696ed25 100644
--- a/src/lib/utils/props/PropQuaternionX.ts
+++ b/src/lib/utils/props/PropQuaternionX.ts
@@ -20,7 +20,7 @@ export default class PropQuaternionX {
 
 			case value:
 				// same object, perform deep check
-				for (let k in value) {
+				for (const k in value) {
 					if (not_equal(this.prevValues[k], value[k])) {
 						Propeller.update(obj, this.obj_type, this.key, value, this.origin, "Quaternion")
 						this.setPrevValues(value)
diff --git a/src/lib/utils/props/PropVector3X.ts b/src/lib/utils/props/PropVector3X.ts
index de296eb..0905742 100644
--- a/src/lib/utils/props/PropVector3X.ts
+++ b/src/lib/utils/props/PropVector3X.ts
@@ -20,7 +20,7 @@ export default class PropVector3X {
 
 			case value:
 				// same object, perform deep check
-				for (let k in value) {
+				for (const k in value) {
 					if (not_equal(this.prevValues[k], value[k])) {
 						Propeller.update(obj, this.obj_type, this.key, value, this.origin, "Vector3")
 						this.setPrevValues(value)