fix(form-core): prevValidationResult initialize as empty array

.changeset/loud-planes-doubt.md

@@ -0,0 +1,5 @@
+---
+'@lion/form-core': patch
+---
+
+Make sure prev validation result is always an array (of validators) and not undefined.

packages/form-core/src/validate/ResultValidator.js

@@ -10,7 +10,7 @@ export class ResultValidator extends Validator {
   /**
    * @param {Object} context
    * @param {Validator[]} context.regularValidationResult
-   * @param {Validator[] | undefined} context.prevValidationResult
+   * @param {Validator[]} context.prevValidationResult
    * @param {Validator[]} [context.validators]
    * @returns {boolean}
    */

packages/form-core/src/validate/ValidateMixin.js

@@ -161,6 +161,8 @@ export const ValidateMixinImplementation = superclass =>
        * @type {Validator[]}
        */
       this.__validationResult = [];
+      /** @type {Validator[]} */
+      this.__prevValidationResult = [];
 
       this.__onValidatorUpdated = this.__onValidatorUpdated.bind(this);
       this._updateFeedbackComponent = this._updateFeedbackComponent.bind(this);