feat: add simple reporter and formatter along with validators

Author: emyann

src/validation/reporter.ts

@@ -0,0 +1,42 @@
+import { getSymbolName } from '../helpers';
+import { StringValidator } from './validators';
+import { BooleanValidator } from './validators';
+import { NumberValidator } from './validators';
+import { ValuePropertyValidationError } from './PropertyValidationError';
+
+export const ERRORS = Symbol('errors');
+
+export interface ValidationError extends ValuePropertyValidationError {
+  targetProperty: string;
+}
+
+export interface Errors extends Array<ValidationError> {}
+
+export interface Validation {
+  [ERRORS]: Errors;
+}
+
+export function targetContainsErrors(target: any): target is Validation {
+  return target && target[ERRORS] && target[ERRORS].length > 0;
+}
+
+export function formatter(error: ValidationError) {
+  const { value, targetProperty, type } = error;
+  return `Invalid value ${value} supplied to : [⚠️ Schema With Type] at property ${targetProperty}. Expecting type ${getSymbolName(type)}`;
+}
+export function reporter(target: any) {
+  if (!targetContainsErrors(target)) return [];
+
+  const errors = target[ERRORS];
+  return errors.map(formatter);
+}
+
+export function parse(value: any, type: symbol) {
+  if (type === StringValidator.type) {
+    return StringValidator.validateAndParse(value);
+  } else if (type === NumberValidator.type) {
+    return NumberValidator.validateAndParse(value);
+  } else if (type === BooleanValidator.type) {
+    return BooleanValidator.validateAndParse(value);
+  }
+}