adds missing files

packages/builder/src/helpers/validation/validation.js

@@ -0,0 +1,15 @@
+import { writable, derived } from 'svelte/store'
+
+export function createValidationStore(initialValue, ...validators) {
+	
+	const value = writable(initialValue || '') 
+	const error = derived(value, $v => validate($v, validators))
+	
+	return [value, error]
+}
+
+function validate(value, validators) {
+    const failing = validators.find(v => v(value) !== true)
+
+    return failing && failing(value)
+}

packages/builder/src/helpers/validation/validators.js

@@ -0,0 +1,12 @@
+function emailValidator (value) {
+    return (value && !!value.match(/^(([^<>()[\]\\.,;:\s@"]+(\.[^<>()[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/)) || 'Please enter a valid email'
+  }
+
+function requiredValidator (value) {
+    return (value !== undefined && value !== null && value !== '') || 'This field is required'
+  }
+
+export {
+  emailValidator,
+  requiredValidator
+}