diff --git a/src/materials/BasicMaterial.js b/src/materials/BasicMaterial.js
deleted file mode 100644
index 798f376..0000000
--- a/src/materials/BasicMaterial.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { defineComponent } from 'vue';
-import { MeshBasicMaterial } from 'three';
-import { bindProps, propsValues } from '../tools';
-import Material, { wireframeProps } from './Material';
-
-export default defineComponent({
-  extends: Material,
-  props: {
-    ...wireframeProps,
-  },
-  methods: {
-    createMaterial() {
-      this.material = new MeshBasicMaterial(propsValues(this.$props));
-    },
-    addWatchers() {
-      bindProps(this, Object.keys(wireframeProps), this.material);
-    },
-  },
-  __hmrId: 'BasicMaterial',
-});
diff --git a/src/materials/BasicMaterial.ts b/src/materials/BasicMaterial.ts
new file mode 100644
index 0000000..83a66d5
--- /dev/null
+++ b/src/materials/BasicMaterial.ts
@@ -0,0 +1,19 @@
+import { defineComponent } from 'vue'
+import { MeshBasicMaterial } from 'three'
+import { bindProps, propsValues } from '../tools'
+import Material, { wireframeProps } from './Material'
+
+export default defineComponent({
+  extends: Material,
+  props: {
+    ...wireframeProps,
+  },
+  methods: {
+    createMaterial() {
+      const material = new MeshBasicMaterial(propsValues(this.$props))
+      bindProps(this, Object.keys(wireframeProps), material)
+      return material
+    },
+  },
+  __hmrId: 'BasicMaterial',
+})
diff --git a/src/materials/LambertMaterial.js b/src/materials/LambertMaterial.js
deleted file mode 100644
index 2637e49..0000000
--- a/src/materials/LambertMaterial.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { defineComponent } from 'vue';
-import { MeshLambertMaterial } from 'three';
-import { bindProps, propsValues } from '../tools';
-import Material, { wireframeProps } from './Material';
-
-export default defineComponent({
-  extends: Material,
-  props: {
-    ...wireframeProps,
-  },
-  methods: {
-    createMaterial() {
-      this.material = new MeshLambertMaterial(propsValues(this.$props));
-    },
-    addWatchers() {
-      bindProps(this, Object.keys(wireframeProps), this.material);
-    },
-  },
-  __hmrId: 'LambertMaterial',
-});
diff --git a/src/materials/LambertMaterial.ts b/src/materials/LambertMaterial.ts
new file mode 100644
index 0000000..084d212
--- /dev/null
+++ b/src/materials/LambertMaterial.ts
@@ -0,0 +1,19 @@
+import { defineComponent } from 'vue'
+import { MeshLambertMaterial } from 'three'
+import { bindProps, propsValues } from '../tools'
+import Material, { wireframeProps } from './Material'
+
+export default defineComponent({
+  extends: Material,
+  props: {
+    ...wireframeProps,
+  },
+  methods: {
+    createMaterial() {
+      const material = new MeshLambertMaterial(propsValues(this.$props))
+      bindProps(this, Object.keys(wireframeProps), material)
+      return material
+    },
+  },
+  __hmrId: 'LambertMaterial',
+})
diff --git a/src/materials/MatcapMaterial.js b/src/materials/MatcapMaterial.js
deleted file mode 100644
index 4e5161f..0000000
--- a/src/materials/MatcapMaterial.js
+++ /dev/null
@@ -1,25 +0,0 @@
-import { defineComponent } from 'vue';
-import { MeshMatcapMaterial, TextureLoader } from 'three';
-import { propsValues, getMatcapUrl } from '../tools';
-import Material from './Material';
-
-export default defineComponent({
-  extends: Material,
-  props: {
-    src: String,
-    name: String,
-    flatShading: Boolean,
-  },
-  methods: {
-    createMaterial() {
-      const src = this.name ? getMatcapUrl(this.name) : this.src;
-      const opts = propsValues(this.$props, ['src', 'name']);
-      opts.matcap = new TextureLoader().load(src);
-      this.material = new MeshMatcapMaterial(opts);
-    },
-    addWatchers() {
-      // TODO
-    },
-  },
-  __hmrId: 'MatcapMaterial',
-});
diff --git a/src/materials/MatcapMaterial.ts b/src/materials/MatcapMaterial.ts
new file mode 100644
index 0000000..4a12d39
--- /dev/null
+++ b/src/materials/MatcapMaterial.ts
@@ -0,0 +1,22 @@
+import { defineComponent } from 'vue'
+import { MeshMatcapMaterial, TextureLoader } from 'three'
+import { propsValues, getMatcapUrl } from '../tools'
+import Material from './Material'
+
+export default defineComponent({
+  extends: Material,
+  props: {
+    src: String,
+    name: { type: String, default: '0404E8_0404B5_0404CB_3333FC' },
+    flatShading: Boolean,
+  },
+  methods: {
+    createMaterial() {
+      const src = this.src ? this.src : getMatcapUrl(this.name)
+      const opts = propsValues(this.$props, ['src', 'name'])
+      opts.matcap = new TextureLoader().load(src)
+      return new MeshMatcapMaterial(opts)
+    },
+  },
+  __hmrId: 'MatcapMaterial',
+})
diff --git a/src/materials/Material.js b/src/materials/Material.js
deleted file mode 100644
index c2fbc77..0000000
--- a/src/materials/Material.js
+++ /dev/null
@@ -1,63 +0,0 @@
-import { defineComponent, watch } from 'vue';
-import { FrontSide } from 'three';
-
-export default defineComponent({
-  inject: ['three', 'mesh'],
-  props: {
-    color: { type: [String, Number], default: '#ffffff' },
-    depthTest: { type: Boolean, default: true },
-    depthWrite: { type: Boolean, default: true },
-    fog: { type: Boolean, default: true },
-    opacity: { type: Number, default: 1 },
-    side: { type: Number, default: FrontSide },
-    transparent: Boolean,
-    vertexColors: Boolean,
-  },
-  provide() {
-    return {
-      material: this,
-    };
-  },
-  created() {
-    this.createMaterial();
-    this.mesh.setMaterial(this.material);
-
-    this._addWatchers();
-    if (this.addWatchers) this.addWatchers();
-  },
-  unmounted() {
-    this.material.dispose();
-  },
-  methods: {
-    setProp(key, value, needsUpdate = false) {
-      this.material[key] = value;
-      this.material.needsUpdate = needsUpdate;
-    },
-    setTexture(texture, key = 'map') {
-      this.setProp(key, texture, true);
-    },
-    _addWatchers() {
-      ['color', 'depthTest', 'depthWrite', 'fog', 'opacity', 'side', 'transparent'].forEach(p => {
-        watch(() => this[p], () => {
-          if (p === 'color') {
-            this.material.color.set(this.color);
-          } else {
-            this.material[p] = this[p];
-          }
-        });
-      });
-    },
-  },
-  render() {
-    return this.$slots.default ? this.$slots.default() : [];
-  },
-  __hmrId: 'Material',
-});
-
-export const wireframeProps = {
-  wireframe: { type: Boolean, default: false },
-  // not needed for WebGL
-  // wireframeLinecap: { type: String, default: 'round' },
-  // wireframeLinejoin: { type: String, default: 'round' },
-  wireframeLinewidth: { type: Number, default: 1 }, // not really useful
-};
diff --git a/src/materials/Material.ts b/src/materials/Material.ts
new file mode 100644
index 0000000..3af5d72
--- /dev/null
+++ b/src/materials/Material.ts
@@ -0,0 +1,85 @@
+import { defineComponent, watch } from 'vue'
+import { FrontSide, Material, Texture } from 'three'
+
+interface MeshInterface {
+  setMaterial(material: Material): void
+}
+
+interface MaterialInterface {
+  mesh?: MeshInterface
+  material?: Material
+  createMaterial?(): Material
+  addWatchers?(m: Material): void
+}
+
+export default defineComponent({
+  inject: ['three', 'mesh'],
+  props: {
+    color: { type: [String, Number], default: '#ffffff' },
+    depthTest: { type: Boolean, default: true },
+    depthWrite: { type: Boolean, default: true },
+    fog: { type: Boolean, default: true },
+    opacity: { type: Number, default: 1 },
+    side: { type: Number, default: FrontSide },
+    transparent: Boolean,
+    vertexColors: Boolean,
+  },
+  setup(): MaterialInterface {
+    return {}
+  },
+  provide() {
+    return {
+      material: this,
+    }
+  },
+  created() {
+    if (!this.mesh) {
+      console.error('Missing parent Mesh')
+      return
+    }
+
+    if (this.createMaterial) {
+      this.material = this.createMaterial()
+      this.mesh.setMaterial(this.material)
+      this._addWatchers()
+      this.addWatchers?.(this.material)
+    }
+  },
+  unmounted() {
+    this.material?.dispose()
+  },
+  methods: {
+    setProp(key: string, value: any, needsUpdate = false) {
+      if (this.material) {
+        this.material[key] = value
+        this.material.needsUpdate = needsUpdate
+      }
+    },
+    setTexture(texture: Texture, key = 'map') {
+      this.setProp(key, texture, true)
+    },
+    _addWatchers() {
+      ['color', 'depthTest', 'depthWrite', 'fog', 'opacity', 'side', 'transparent'].forEach(p => {
+        watch(() => this[p], (value) => {
+          if (p === 'color') {
+            this.material.color.set(value)
+          } else {
+            this.material[p] = value
+          }
+        })
+      })
+    },
+  },
+  render() {
+    return this.$slots.default ? this.$slots.default() : []
+  },
+  __hmrId: 'Material',
+})
+
+export const wireframeProps = {
+  wireframe: { type: Boolean, default: false },
+  // not needed for WebGL
+  // wireframeLinecap: { type: String, default: 'round' },
+  // wireframeLinejoin: { type: String, default: 'round' },
+  wireframeLinewidth: { type: Number, default: 1 }, // not really useful
+}
diff --git a/src/materials/PhongMaterial.js b/src/materials/PhongMaterial.ts
similarity index 52%
rename from src/materials/PhongMaterial.js
rename to src/materials/PhongMaterial.ts
index 1e70b4f..2abcc87 100644
--- a/src/materials/PhongMaterial.js
+++ b/src/materials/PhongMaterial.ts
@@ -1,7 +1,7 @@
-import { defineComponent, watch } from 'vue';
-import { MeshPhongMaterial } from 'three';
-import { bindProps, propsValues } from '../tools';
-import Material, { wireframeProps } from './Material';
+import { defineComponent, watch } from 'vue'
+import { MeshPhongMaterial } from 'three'
+import { bindProps, propsValues } from '../tools'
+import Material, { wireframeProps } from './Material'
 
 export default defineComponent({
   extends: Material,
@@ -16,21 +16,23 @@ export default defineComponent({
   },
   methods: {
     createMaterial() {
-      this.material = new MeshPhongMaterial(propsValues(this.$props));
-    },
-    addWatchers() {
+      const material = new MeshPhongMaterial(propsValues(this.$props))
+
       // TODO : handle flatShading ?
-      ['emissive', 'emissiveIntensity', 'reflectivity', 'shininess', 'specular'].forEach(p => {
+      const watchProps = ['emissive', 'emissiveIntensity', 'reflectivity', 'shininess', 'specular']
+      watchProps.forEach(p => {
         watch(() => this[p], (value) => {
           if (p === 'emissive' || p === 'specular') {
-            this.material[p].set(value);
+            material[p].set(value)
           } else {
-            this.material[p] = value;
+            material[p] = value
           }
-        });
-      });
-      bindProps(this, Object.keys(wireframeProps), this.material);
+        })
+      })
+      bindProps(this, Object.keys(wireframeProps), material)
+
+      return material
     },
   },
   __hmrId: 'PhongMaterial',
-});
+})
diff --git a/src/materials/PhysicalMaterial.js b/src/materials/PhysicalMaterial.js
deleted file mode 100644
index 24a4bff..0000000
--- a/src/materials/PhysicalMaterial.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { defineComponent } from 'vue';
-import { MeshPhysicalMaterial } from 'three';
-import { propsValues } from '../tools';
-import StandardMaterial from './StandardMaterial';
-
-export default defineComponent({
-  extends: StandardMaterial,
-  props: {
-    flatShading: Boolean,
-  },
-  methods: {
-    createMaterial() {
-      this.material = new MeshPhysicalMaterial(propsValues(this.$props));
-    },
-    addWatchers() {
-      // TODO
-    },
-  },
-  __hmrId: 'PhysicalMaterial',
-});
diff --git a/src/materials/PhysicalMaterial.ts b/src/materials/PhysicalMaterial.ts
new file mode 100644
index 0000000..8f6681f
--- /dev/null
+++ b/src/materials/PhysicalMaterial.ts
@@ -0,0 +1,17 @@
+import { defineComponent } from 'vue'
+import { MeshPhysicalMaterial } from 'three'
+import { propsValues } from '../tools'
+import StandardMaterial from './StandardMaterial'
+
+export default defineComponent({
+  extends: StandardMaterial,
+  props: {
+    flatShading: Boolean,
+  },
+  methods: {
+    createMaterial() {
+      return new MeshPhysicalMaterial(propsValues(this.$props))
+    },
+  },
+  __hmrId: 'PhysicalMaterial',
+})
diff --git a/src/materials/StandardMaterial.js b/src/materials/StandardMaterial.ts
similarity index 59%
rename from src/materials/StandardMaterial.js
rename to src/materials/StandardMaterial.ts
index 99b5296..52f85b9 100644
--- a/src/materials/StandardMaterial.js
+++ b/src/materials/StandardMaterial.ts
@@ -1,7 +1,7 @@
-import { defineComponent, watch } from 'vue';
-import { MeshStandardMaterial } from 'three';
-import { bindProp, bindProps, propsValues } from '../tools';
-import Material, { wireframeProps } from './Material';
+import { defineComponent, watch } from 'vue'
+import { MeshStandardMaterial } from 'three'
+import { bindProp, bindProps, propsValues } from '../tools'
+import Material, { wireframeProps } from './Material'
 
 const props = {
   aoMapIntensity: { type: Number, default: 1 },
@@ -13,11 +13,11 @@ const props = {
   envMapIntensity: { type: Number, default: 1 },
   lightMapIntensity: { type: Number, default: 1 },
   metalness: { type: Number, default: 0 },
-  normalScale: { type: Object, default: { x: 1, y: 1 } },
+  normalScale: { type: Object, default: () => ({ x: 1, y: 1 }) },
   roughness: { type: Number, default: 1 },
   refractionRatio: { type: Number, default: 0.98 },
   flatShading: Boolean,
-};
+}
 
 export default defineComponent({
   extends: Material,
@@ -27,23 +27,25 @@ export default defineComponent({
   },
   methods: {
     createMaterial() {
-      this.material = new MeshStandardMaterial(propsValues(this.$props, ['normalScale']));
-    },
-    addWatchers() {
+      const material = new MeshStandardMaterial(propsValues(this.$props, ['normalScale']))
+
       // TODO : use setProp, handle flatShading ?
       Object.keys(props).forEach(p => {
-        if (p === 'normalScale') return;
+        if (p === 'normalScale') return
         watch(() => this[p], (value) => {
           if (p === 'emissive') {
-            this.material[p].set(value);
+            material[p].set(value)
           } else {
-            this.material[p] = value;
+            material[p] = value
           }
-        });
-      });
-      bindProp(this, 'normalScale', this.material);
-      bindProps(this, Object.keys(wireframeProps), this.material);
+        })
+      })
+
+      bindProp(this, 'normalScale', material)
+      bindProps(this, Object.keys(wireframeProps), material)
+
+      return material
     },
   },
   __hmrId: 'StandardMaterial',
-});
+})
diff --git a/src/materials/SubsurfaceScatteringShader.js b/src/materials/SubsurfaceScatteringShader.ts
similarity index 75%
rename from src/materials/SubsurfaceScatteringShader.js
rename to src/materials/SubsurfaceScatteringShader.ts
index a067846..d5a075c 100644
--- a/src/materials/SubsurfaceScatteringShader.js
+++ b/src/materials/SubsurfaceScatteringShader.ts
@@ -11,14 +11,14 @@ import {
   ShaderChunk,
   ShaderLib,
   UniformsUtils,
-} from 'three';
+} from 'three'
 
-function replaceAll(string, find, replace) {
-  return string.split(find).join(replace);
+function replaceAll(string: string, find: string, replace: string) {
+  return string.split(find).join(replace)
 }
 
-const meshphongFragHead = ShaderChunk.meshphong_frag.slice(0, ShaderChunk.meshphong_frag.indexOf('void main() {'));
-const meshphongFragBody = ShaderChunk.meshphong_frag.slice(ShaderChunk.meshphong_frag.indexOf('void main() {'));
+const meshphongFragHead = ShaderChunk.meshphong_frag.slice(0, ShaderChunk.meshphong_frag.indexOf('void main() {'))
+const meshphongFragBody = ShaderChunk.meshphong_frag.slice(ShaderChunk.meshphong_frag.indexOf('void main() {'))
 
 const SubsurfaceScatteringShader = {
 
@@ -45,23 +45,23 @@ const SubsurfaceScatteringShader = {
 
     ${meshphongFragHead}
 
-    uniform float thicknessPower;
-    uniform float thicknessScale;
-    uniform float thicknessDistortion;
-    uniform float thicknessAmbient;
-    uniform float thicknessAttenuation;
-    uniform vec3 thicknessColor;
+    uniform float thicknessPower
+    uniform float thicknessScale
+    uniform float thicknessDistortion
+    uniform float thicknessAmbient
+    uniform float thicknessAttenuation
+    uniform vec3 thicknessColor
 
     void RE_Direct_Scattering(const in IncidentLight directLight, const in vec2 uv, const in GeometricContext geometry, inout ReflectedLight reflectedLight) {
       #ifdef USE_COLOR
-        vec3 thickness = vColor * thicknessColor;
+        vec3 thickness = vColor * thicknessColor
       #else
-        vec3 thickness = thicknessColor;
+        vec3 thickness = thicknessColor
       #endif
-      vec3 scatteringHalf = normalize(directLight.direction + (geometry.normal * thicknessDistortion));
-      float scatteringDot = pow(saturate(dot(geometry.viewDir, -scatteringHalf)), thicknessPower) * thicknessScale;
-      vec3 scatteringIllu = (scatteringDot + thicknessAmbient) * thickness;
-      reflectedLight.directDiffuse += scatteringIllu * thicknessAttenuation * directLight.color;
+      vec3 scatteringHalf = normalize(directLight.direction + (geometry.normal * thicknessDistortion))
+      float scatteringDot = pow(saturate(dot(geometry.viewDir, -scatteringHalf)), thicknessPower) * thicknessScale
+      vec3 scatteringIllu = (scatteringDot + thicknessAmbient) * thickness
+      reflectedLight.directDiffuse += scatteringIllu * thicknessAttenuation * directLight.color
     }
   ` + meshphongFragBody.replace(
     '#include <lights_fragment_begin>',
@@ -69,13 +69,13 @@ const SubsurfaceScatteringShader = {
       ShaderChunk.lights_fragment_begin,
       'RE_Direct( directLight, geometry, material, reflectedLight );',
       `
-        RE_Direct( directLight, geometry, material, reflectedLight );
+        RE_Direct( directLight, geometry, material, reflectedLight )
         #if defined( SUBSURFACE ) && defined( USE_UV )
-          RE_Direct_Scattering(directLight, vUv, geometry, reflectedLight);
+          RE_Direct_Scattering(directLight, vUv, geometry, reflectedLight)
         #endif
       `
     )
   ),
-};
+}
 
-export default SubsurfaceScatteringShader;
+export default SubsurfaceScatteringShader
diff --git a/src/materials/ToonMaterial.js b/src/materials/ToonMaterial.js
deleted file mode 100644
index 719e20b..0000000
--- a/src/materials/ToonMaterial.js
+++ /dev/null
@@ -1,20 +0,0 @@
-import { defineComponent } from 'vue';
-import { MeshToonMaterial } from 'three';
-import { bindProps, propsValues } from '../tools';
-import Material, { wireframeProps } from './Material';
-
-export default defineComponent({
-  extends: Material,
-  props: {
-    ...wireframeProps,
-  },
-  methods: {
-    createMaterial() {
-      this.material = new MeshToonMaterial(propsValues(this.$props));
-    },
-    addWatchers() {
-      bindProps(this, Object.keys(wireframeProps), this.material);
-    },
-  },
-  __hmrId: 'ToonMaterial',
-});
diff --git a/src/materials/ToonMaterial.ts b/src/materials/ToonMaterial.ts
new file mode 100644
index 0000000..25c4078
--- /dev/null
+++ b/src/materials/ToonMaterial.ts
@@ -0,0 +1,19 @@
+import { defineComponent } from 'vue'
+import { MeshToonMaterial } from 'three'
+import { bindProps, propsValues } from '../tools'
+import Material, { wireframeProps } from './Material'
+
+export default defineComponent({
+  extends: Material,
+  props: {
+    ...wireframeProps,
+  },
+  methods: {
+    createMaterial() {
+      const material = new MeshToonMaterial(propsValues(this.$props))
+      bindProps(this, Object.keys(wireframeProps), material)
+      return material
+    },
+  },
+  __hmrId: 'ToonMaterial',
+})
diff --git a/src/materials/index.js b/src/materials/index.js
deleted file mode 100644
index af0be33..0000000
--- a/src/materials/index.js
+++ /dev/null
@@ -1,12 +0,0 @@
-export { default as BasicMaterial } from './BasicMaterial.js';
-export { default as LambertMaterial } from './LambertMaterial.js';
-export { default as MatcapMaterial } from './MatcapMaterial.js';
-export { default as PhongMaterial } from './PhongMaterial.js';
-export { default as PhysicalMaterial } from './PhysicalMaterial.js';
-export { default as ShaderMaterial } from './ShaderMaterial.js';
-export { default as StandardMaterial } from './StandardMaterial.js';
-export { default as SubSurfaceMaterial } from './SubSurfaceMaterial.js';
-export { default as ToonMaterial } from './ToonMaterial.js';
-
-export { default as Texture } from './Texture.js';
-export { default as CubeTexture } from './CubeTexture.js';
diff --git a/src/materials/index.ts b/src/materials/index.ts
new file mode 100644
index 0000000..80e6196
--- /dev/null
+++ b/src/materials/index.ts
@@ -0,0 +1,12 @@
+export { default as BasicMaterial } from './BasicMaterial'
+export { default as LambertMaterial } from './LambertMaterial'
+export { default as MatcapMaterial } from './MatcapMaterial'
+export { default as PhongMaterial } from './PhongMaterial'
+export { default as PhysicalMaterial } from './PhysicalMaterial'
+export { default as ShaderMaterial } from './ShaderMaterial'
+export { default as StandardMaterial } from './StandardMaterial'
+export { default as SubSurfaceMaterial } from './SubSurfaceMaterial'
+export { default as ToonMaterial } from './ToonMaterial'
+
+export { default as Texture } from './Texture'
+export { default as CubeTexture } from './CubeTexture'