diff --git a/src/directive.ts b/src/directive.ts
index fc942bc..56198a2 100644
--- a/src/directive.ts
+++ b/src/directive.ts
@@ -6,14 +6,14 @@ type MaskaDirective = Directive<HTMLElement, MaskInputOptions | undefined>
 const masks = new WeakMap<HTMLInputElement, MaskInput>()
 
 // hacky way to update binding.arg without using defineExposed
-const setArg = (binding: DirectiveBinding, value: string | boolean) => {
-  if (!binding.arg || (binding.instance == null)) return
+const setArg = (binding: DirectiveBinding, value: string | boolean): void => {
+  if (binding.arg == null || (binding.instance == null)) return
 
   const inst = binding.instance as any
 
   if (binding.arg in inst) {
     inst[binding.arg] = value // options api
-  } else if (inst.$?.setupState && binding.arg in inst.$.setupState) {
+  } else if (inst.$?.setupState != null && binding.arg in inst.$.setupState) {
     inst.$.setupState[binding.arg] = value // composition api
   }
 }
@@ -24,8 +24,8 @@ export const vMaska: MaskaDirective = (el, binding) => {
 
   if (input == null || input?.type === 'file') return
 
-  if (binding.arg) {
-    const updateArg = (detail: MaskaDetail) => {
+  if (binding.arg != null) {
+    const updateArg = (detail: MaskaDetail): void => {
       const value = binding.modifiers.unmasked
         ? detail.unmasked
         : binding.modifiers.completed
diff --git a/src/mask-input.ts b/src/mask-input.ts
index 21c25ad..4bf1be5 100644
--- a/src/mask-input.ts
+++ b/src/mask-input.ts
@@ -31,8 +31,8 @@ export class MaskInput {
     this.init(Array.from(this.items.keys()), needUpdate)
   }
 
-  updateValue (input: HTMLInputElement) {
-    if (input.value && input.value !== this.processInput(input).masked) {
+  updateValue (input: HTMLInputElement): void {
+    if (input.value !== '' && input.value !== this.processInput(input).masked) {
       this.setValue(input, input.value)
     }
   }
@@ -97,7 +97,7 @@ export class MaskInput {
     this.fixCursor(input, isDelete, () => this.setValue(input, value))
   }
 
-  private fixCursor (input: HTMLInputElement, isDelete: boolean, closure: any) {
+  private fixCursor (input: HTMLInputElement, isDelete: boolean, closure: CallableFunction): void {
     const pos = input.selectionStart
     const value = input.value