Fixes a race condition that could add validation errors for fields that had been removed

src/components/Formulate.vue

@@ -48,7 +48,8 @@ export default {
     return {
       parentIdentifier: 'vue-formulate-wrapper-element',
       forceErrors: null,
-      fieldInitials: {}
+      fieldInitials: {},
+      whenFinishedValidating: Promise.resolve()
     }
   },
   computed: {
@@ -103,13 +104,16 @@ export default {
   methods: {
     registerField (field, data) {
       this.$store.commit(`${this.m}setFieldMeta`, {form: this.name, field, data})
+      if (data.type !== 'submit') {
         this.$store.commit(`${this.m}setFieldValue`, {
           field,
           value: this.mergedInitial.hasOwnProperty(field) ? this.mergedInitial[field] : undefined,
           form: this.name
         })
+      }
     },
-    deregisterField (field) {
+    async deregisterField (field) {
+      await this.whenFinishedValidating
       this.$store.commit(`${this.m}removeField`, {
         form: this.name,
         field
@@ -151,16 +155,19 @@ export default {
         label
       }, validation, this.values)
       if (!equals(errors || [], (this.validationErrors[field] || []))) {
+        if (this.fields.find(f => f.name === field)) {
           this.updateFieldValidationErrors({field, errors: errors || []})
         }
+      }
       return errors
     },
-    updateFormValidation () {
-      this.fields.map(async field => this.validateField({
+    async updateFormValidation () {
+      await this.whenFinishedValidating
+      this.whenFinishedValidating = Promise.all(this.fields.map(async field => this.validateField({
         field: field.name,
         validation: field.validation,
         label: field.validationLabel || field.label || field.name
-      }))
+      })))
     },
     submit () {
       if ((this.prevent === 'validation' && this.hasValidationErrors) || (this.prevent === 'any' && this.hasErrors)) {

src/store.js

@@ -90,6 +90,11 @@ export const formulateMutations = (mutations = {}) => Object.assign({
         state[group][form] = filter(state[group][form], (key, value) => key !== field)
       }
     }
+  },
+  removeFieldValidationErrors (state, {form, field}) {
+    state.validationErrors = Object.assign({}, state.validationErrors, {
+      [form]: filter(state.validationErrors[form] || {}, key => key !== field)
+    })
   }
 }, mutations)