Optimize directive work

src/directive.ts

@@ -7,13 +7,18 @@ const masks = new WeakMap<HTMLInputElement, MaskInput>()
 
 export const vMaska: MaskaDirective = (el, binding) => {
   const input = el instanceof HTMLInputElement ? el : el.querySelector('input')
+  const opts = { ...(binding.arg as MaskInputOptions) } ?? {}
+
   if (input == null) return
 
-  if (masks.get(input) != null) {
-    masks.get(input)?.destroy()
-  }
+  const existed = masks.get(input)
+  if (existed != null) {
+    if (!existed.needUpdate(input, opts)) {
+      return
+    }
 
-  const opts = { ...(binding.arg as MaskInputOptions) } ?? {}
+    existed.destroy()
+  }
 
   if (binding.value != null) {
     const binded = binding.value
@@ -32,4 +37,11 @@ export const vMaska: MaskaDirective = (el, binding) => {
   }
 
   masks.set(input, new MaskInput(input, opts))
+
+  // check initial value for v-model
+  setTimeout(() => {
+    if (input.value !== '') {
+      input.dispatchEvent(new InputEvent('input'))
+    }
+  })
 }

src/mask-input.ts

@@ -22,12 +22,16 @@ export class MaskInput {
     target: string | NodeListOf<HTMLInputElement> | HTMLInputElement,
     readonly options: MaskInputOptions = {}
   ) {
-    const { onMaska, preProcess, postProcess, ...opts } = options
-
     if (typeof target === 'string') {
-      this.init(Array.from(document.querySelectorAll(target)), opts)
+      this.init(
+        Array.from(document.querySelectorAll(target)),
+        this.getMaskOpts(options)
+      )
     } else {
-      this.init('length' in target ? Array.from(target) : [target], opts)
+      this.init(
+        'length' in target ? Array.from(target) : [target],
+        this.getMaskOpts(options)
+      )
     }
   }
 
@@ -39,6 +43,19 @@ export class MaskInput {
     this.items.clear()
   }
 
+  needUpdate (input: HTMLInputElement, opts: MaskInputOptions): boolean {
+    const mask = this.items.get(input) as Mask
+    const maskNew = new Mask(parseInput(input, this.getMaskOpts(opts)))
+
+    return JSON.stringify(mask.opts) !== JSON.stringify(maskNew.opts)
+  }
+
+  private getMaskOpts (options: MaskInputOptions): MaskOptions {
+    const { onMaska, preProcess, postProcess, ...opts } = options
+
+    return opts
+  }
+
   private init (inputs: HTMLInputElement[], defaults: MaskOptions): void {
     for (const input of inputs) {
       const mask = new Mask(parseInput(input, defaults))