feat(amplify-alpha): throw ValidationError instead of untyped errors (#33141)

### Issue 

`aws-amplify-alpha` for #32569 

### Description of changes

ValidationErrors everywhere

### Describe any new or updated permissions being added

n/a

### Description of how you validated changes

Existing tests. Exemptions granted as this is basically a refactor of existing code.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: mrgrain

packages/@aws-cdk/aws-amplify-alpha/.eslintrc.js

@@ -4,5 +4,12 @@ baseConfig.parserOptions.project = __dirname + '/tsconfig.json';
 baseConfig.rules['import/no-extraneous-dependencies'] = ['error', { devDependencies: true, peerDependencies: true } ];
 baseConfig.rules['import/order'] = 'off';
 baseConfig.rules['@aws-cdk/invalid-cfn-imports'] = 'off';
+baseConfig.rules['@cdklabs/no-throw-default-error'] = ['error'];
+baseConfig.overrides.push({
+  files: ["./test/**"],
+  rules: {
+    "@cdklabs/no-throw-default-error": "off",
+  },
+});
 
 module.exports = baseConfig;

packages/@aws-cdk/aws-amplify-alpha/lib/domain.ts

@@ -1,6 +1,6 @@
 import * as acm from 'aws-cdk-lib/aws-certificatemanager';
 import * as iam from 'aws-cdk-lib/aws-iam';
-import { Lazy, Resource, IResolvable, Token } from 'aws-cdk-lib/core';
+import { Lazy, Resource, IResolvable, Token, ValidationError } from 'aws-cdk-lib/core';
 import { Construct } from 'constructs';
 import { CfnDomain } from 'aws-cdk-lib/aws-amplify';
 import { IApp } from './app';
@@ -131,10 +131,10 @@ export class Domain extends Resource {
 
     const domainName = props.domainName || id;
     if (!Token.isUnresolved(domainName) && domainName.length > 255) {
-      throw new Error(`Domain name must be 255 characters or less, got: ${domainName.length} characters.`);
+      throw new ValidationError(`Domain name must be 255 characters or less, got: ${domainName.length} characters.`, this);
     }
     if (!Token.isUnresolved(domainName) && !/^(((?!-)[A-Za-z0-9-]{0,62}[A-Za-z0-9])\.)+((?!-)[A-Za-z0-9-]{1,62}[A-Za-z0-9])(\.)?$/.test(domainName)) {
-      throw new Error(`Domain name must be a valid hostname, got: ${domainName}.`);
+      throw new ValidationError(`Domain name must be a valid hostname, got: ${domainName}.`, this);
     }
 
     const domain = new CfnDomain(this, 'Resource', {

packages/aws-cdk-lib/.eslintrc.js

@@ -16,12 +16,14 @@ baseConfig.rules['import/no-extraneous-dependencies'] = [
 
 // no-throw-default-error
 const enableNoThrowDefaultErrorIn = [
+  'aws-amplify',
+  'aws-amplifyuibuilder',  
   'aws-apigatewayv2-authorizers',
   'aws-apigatewayv2-integrations',
   'aws-elasticloadbalancing',
   'aws-elasticloadbalancingv2',
   'aws-elasticloadbalancingv2-actions',
-  'aws-elasticloadbalancingv2-targets',    
+  'aws-elasticloadbalancingv2-targets',
   'aws-lambda',
   'aws-rds',
   'aws-s3',

packages/aws-cdk-lib/core/lib/errors.ts

@@ -142,6 +142,8 @@ abstract class ConstructError extends Error {
  *
  * A ValidationError is always attached to a Construct scope. To a user, the error will present with additional
  * information on the construct that caused the validation to fail.
+ *
+ * @internal
  */
 export class ValidationError extends ConstructError {
   public get type(): 'validation' {
@@ -162,6 +164,8 @@ export class ValidationError extends ConstructError {
  *
  * To a User, these errors still present themselves as a "ValidationError".
  * However they do not contain any information about the location in the construct tree.
+ *
+ * @internal
  */
 export class UnscopedValidationError extends ConstructError {
   public get type(): 'validation' {

packages/aws-cdk-lib/core/lib/index.ts

@@ -35,7 +35,7 @@ export * from './expiration';
 export * from './size';
 export * from './stack-trace';
 export { Element } from './deps';
-export { Errors } from './errors';
+export * from './errors';
 
 export * from './app';
 export * from './context-provider';