diff --git a/src/effects/BokehPass.ts b/src/effects/BokehPass.ts
index ecd101b..ac6a1de 100644
--- a/src/effects/BokehPass.ts
+++ b/src/effects/BokehPass.ts
@@ -6,7 +6,7 @@ const props = {
   focus: { type: Number, default: 1 },
   aperture: { type: Number, default: 0.025 },
   maxblur: { type: Number, default: 0.01 },
-}
+} as const
 
 export default defineComponent({
   extends: EffectPass,
diff --git a/src/effects/FilmPass.ts b/src/effects/FilmPass.ts
index db21081..0c1c0d4 100644
--- a/src/effects/FilmPass.ts
+++ b/src/effects/FilmPass.ts
@@ -7,7 +7,7 @@ const props = {
   scanlinesIntensity: { type: Number, default: 0.05 },
   scanlinesCount: { type: Number, default: 4096 },
   grayscale: { type: Number, default: 0 },
-}
+} as const
 
 export default defineComponent({
   extends: EffectPass,
diff --git a/src/effects/HalftonePass.ts b/src/effects/HalftonePass.ts
index 00a1f6a..3c8050e 100644
--- a/src/effects/HalftonePass.ts
+++ b/src/effects/HalftonePass.ts
@@ -9,7 +9,7 @@ const props = {
   rotateG: { type: Number, default: Math.PI / 12 * 2 },
   rotateB: { type: Number, default: Math.PI / 12 * 3 },
   scatter: { type: Number, default: 0 },
-}
+} as const
 
 export default defineComponent({
   extends: EffectPass,
diff --git a/src/effects/TiltShiftPass.ts b/src/effects/TiltShiftPass.ts
index 5e38226..9dcafde 100644
--- a/src/effects/TiltShiftPass.ts
+++ b/src/effects/TiltShiftPass.ts
@@ -11,7 +11,7 @@ const props = {
   gradientRadius: { type: Number, default: 100 },
   start: { type: Object as PropType<Vector2PropInterface>, default: () => ({ x: 0, y: 100 }) },
   end: { type: Object as PropType<Vector2PropInterface>, default: () => ({ x: 10, y: 100 }) },
-}
+} as const
 
 interface TiltShiftPassSetupInterface {
   uniforms1: {[name: string]: { value: any }}
diff --git a/src/effects/UnrealBloomPass.ts b/src/effects/UnrealBloomPass.ts
index 5e0d0c3..d6c16f3 100644
--- a/src/effects/UnrealBloomPass.ts
+++ b/src/effects/UnrealBloomPass.ts
@@ -7,7 +7,7 @@ const props = {
   strength: { type: Number, default: 1.5 },
   radius: { type: Number, default: 0 },
   threshold: { type: Number, default: 0 },
-}
+} as const
 
 export default defineComponent({
   extends: EffectPass,
diff --git a/src/materials/StandardMaterial.ts b/src/materials/StandardMaterial.ts
index 0a628ac..5b33cfe 100644
--- a/src/materials/StandardMaterial.ts
+++ b/src/materials/StandardMaterial.ts
@@ -9,7 +9,7 @@ const props = {
   bumpScale: { type: Number, default: 1 },
   displacementBias: { type: Number, default: 0 },
   displacementScale: { type: Number, default: 1 },
-  emissive: { type: [Number, String], default: 0 },
+  emissive: { type: [String, Number] as PropType<string | number>, default: 0 },
   emissiveIntensity: { type: Number, default: 1 },
   envMapIntensity: { type: Number, default: 1 },
   lightMapIntensity: { type: Number, default: 1 },
@@ -18,7 +18,7 @@ const props = {
   roughness: { type: Number, default: 1 },
   refractionRatio: { type: Number, default: 0.98 },
   flatShading: Boolean,
-}
+} as const
 
 export default defineComponent({
   extends: Material,
diff --git a/src/materials/SubSurfaceMaterial.ts b/src/materials/SubSurfaceMaterial.ts
index c6eb7cf..7ae05bc 100644
--- a/src/materials/SubSurfaceMaterial.ts
+++ b/src/materials/SubSurfaceMaterial.ts
@@ -1,18 +1,18 @@
-import { defineComponent } from 'vue'
+import { defineComponent, PropType } from 'vue'
 import { Color, ShaderMaterial, UniformsUtils } from 'three'
 import SubsurfaceScatteringShader from './SubsurfaceScatteringShader'
 import Material from './Material'
 // import { bindProps, propsValues } from '../tools'
 
 const props = {
-  color: { type: [String, Number], default: '#ffffff' },
-  thicknessColor: { type: [String, Number], default: '#ffffff' },
+  color: { type: [String, Number] as PropType<string | number>, default: '#ffffff' },
+  thicknessColor: { type: [String, Number] as PropType<string | number>, default: '#ffffff' },
   thicknessDistortion: { type: Number, default: 0.4 },
   thicknessAmbient: { type: Number, default: 0.01 },
   thicknessAttenuation: { type: Number, default: 0.7 },
   thicknessPower: { type: Number, default: 2 },
   thicknessScale: { type: Number, default: 4 },
-}
+} as const
 
 export default defineComponent({
   extends: Material,
diff --git a/src/meshes/Text.ts b/src/meshes/Text.ts
index 8b3cc77..60dedc4 100644
--- a/src/meshes/Text.ts
+++ b/src/meshes/Text.ts
@@ -1,4 +1,4 @@
-import { defineComponent, watch } from 'vue'
+import { defineComponent, PropType, watch } from 'vue'
 import { Font, FontLoader, TextGeometry } from 'three'
 import Mesh, { MeshSetupInterface } from './Mesh'
 
@@ -19,8 +19,8 @@ const props = {
   bevelSize: { type: Number, default: 8 },
   bevelOffset: { type: Number, default: 0 },
   bevelSegments: { type: Number, default: 5 },
-  align: { type: [Boolean, String], default: false },
-}
+  align: { type: [Boolean, String] as PropType<boolean | string>, default: false },
+} as const
 
 export default defineComponent({
   extends: Mesh,