Added new API Mesh Custom Resolver sample.

api-mesh/custom-resolver/.babelrc

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+{
+  "plugins": [
+    "@babel/plugin-transform-react-jsx"
+  ]
+}

api-mesh/custom-resolver/.eslintrc.json

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+{
+    "env": {
+        "es6": true,
+        "node": true
+    },
+    "extends": ["eslint:recommended", "plugin:jest/recommended"],
+    "parserOptions": {
+        "ecmaVersion": "latest"
+    }
+}

api-mesh/custom-resolver/.gitignore

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+
+# package directories
+node_modules
+jspm_packages
+
+# build
+build
+dist
+.manifest-dist.yml
+
+# Config
+config.json
+.env*
+.aio
+
+# Adobe I/O console config
+console.json
+
+# Test output
+junit.xml
+
+# IDE & Temp
+.cache
+.idea
+.nyc_output
+.vscode
+coverage
+.aws.tmp.creds.json
+.wskdebug.props.tmp
+
+# Parcel
+.parcel-cache
+
+# OSX
+.DS_Store
+
+# yeoman
+.yo-repository
+
+# logs folder for aio-run-detached
+logs
+

api-mesh/custom-resolver/README.md

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+# API Mesh Custom Resolver Example
+
+This is an example for API Mesh custom resolver.
+
+## Table of Contents
+
+- [Introduction](#introduction)
+- [Prerequisites](#prerequisites)
+- [Explanation](#explanation)
+
+## Introduction
+
+Custom resolvers allow developers to extend the schema and apply some different business logic to the final result.
+
+## Prerequisites
+
+Before you begin, ensure you have the following:
+
+- An Adobe Developer account
+- Node.js and npm installed on your local machine (nvm 18.x.x (Mac/Linux) or nvm-windows (Windows))
+- API Mesh configured for your project.
+
+## Explanation
+
+With this mesh config and custom resolver we can return two new fields, ```capital``` and ```currency```, to the final result. The data for these fields will be retrieved from Trevorblades GraphQl.
+
+```graphql
+{
+    ACOM_country(id: "US") {
+        available_regions {
+        code
+        id
+        name
+        }
+        full_name_english
+        full_name_locale
+        id
+        three_letter_abbreviation
+        two_letter_abbreviation
+        capital
+        currency
+    }
+}
+```
+
+### Mesh configuration used in this example:
+
+```json
+{
+  "meshConfig": {
+    "sources": [
+      {
+        "name": "ACOMGQL",
+        "handler": {
+          "graphql": {
+            "endpoint": "https://venia.magento.com/graphql"
+          }
+        },
+        "transforms": [
+          {
+            "prefix": {
+              "includeRootOperations": true,
+              "value": "ACOM_"
+            }
+          }
+        ]
+      },
+      {
+        "name": "TBGQL",
+        "handler": {
+          "graphql": {
+            "endpoint": "https://countries.trevorblades.com/graphql"
+          }
+        },
+        "transforms": [
+          {
+            "prefix": {
+              "includeRootOperations": true,
+              "value": "TB_"
+            }
+          }
+        ]
+      }
+    ],
+    "additionalTypeDefs": "extend type ACOM_Country { capital: String currency: String }",
+    "additionalResolvers": [
+      "./resolvers/cc-resolver.js"
+    ]
+  }
+}
+```

api-mesh/custom-resolver/app.config.yaml

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+extensions:
+  dx/excshell/1:
+    $include: src/dx-excshell-1/api-mesh/ext.config.yaml

api-mesh/custom-resolver/jest.setup.js

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+/*
+Copyright 2024 Adobe. All rights reserved.
+This file is licensed to you under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License. You may obtain a copy
+of the License at http://www.apache.org/licenses/LICENSE-2.0
+Unless required by applicable law or agreed to in writing, software distributed under
+the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
+OF ANY KIND, either express or implied. See the License for the specific language
+governing permissions and limitations under the License.
+*/
+
+jest.setTimeout(10000)
+
+beforeEach(() => { })
+afterEach(() => { })