cloned the repository

first-app_01-hello-world/BUILD.bazel

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+filegroup(
+    name = "files",
+    srcs = glob(["**/*"]),
+    visibility = ["//visibility:public"],
+)

first-app_01-hello-world/angular.json

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+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "first-app": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "inlineTemplate": true,
+          "inlineStyle": true,
+          "style": "scss",
+          "skipTests": true
+        },
+        "@schematics/angular:class": {
+          "skipTests": true
+        },
+        "@schematics/angular:directive": {
+          "skipTests": true
+        },
+        "@schematics/angular:guard": {
+          "skipTests": true
+        },
+        "@schematics/angular:interceptor": {
+          "skipTests": true
+        },
+        "@schematics/angular:pipe": {
+          "skipTests": true
+        },
+        "@schematics/angular:resolver": {
+          "skipTests": true
+        },
+        "@schematics/angular:service": {
+          "skipTests": true
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/first-app",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": ["zone.js"],
+            "tsConfig": "tsconfig.app.json",
+            "inlineStyleLanguage": "scss",
+            "assets": ["src/favicon.ico", "src/assets"],
+            "styles": ["src/styles.css"],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kb",
+                  "maximumError": "1mb"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "2kb",
+                  "maximumError": "4kb"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "first-app:build:production"
+            },
+            "development": {
+              "buildTarget": "first-app:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n",
+          "options": {
+            "buildTarget": "first-app:build"
+          }
+        }
+      }
+    }
+  },
+  "cli": {
+    "analytics": false
+  }
+}

first-app_01-hello-world/config.json

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+{
+  "title": "Hello world!",
+  "type": "editor",
+  "answerSrc": "../02-HomeComponent/src",
+  "openFiles": ["src/app/app.component.ts"]
+}

first-app_01-hello-world/db.json

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+{
+    "locations": [
+        {
+            "id": 0,
+            "name": "Acme Fresh Start Housing",
+            "city": "Chicago",
+            "state": "IL",
+            "photo": "https://angular.dev/assets/images/tutorials/common/bernard-hermant-CLKGGwIBTaY-unsplash.jpg",
+            "availableUnits": 4,
+            "wifi": true,
+            "laundry": true
+        },
+        {
+            "id": 1,
+            "name": "A113 Transitional Housing",
+            "city": "Santa Monica",
+            "state": "CA",
+            "photo": "https://angular.dev/assets/images/tutorials/common/brandon-griggs-wR11KBaB86U-unsplash.jpg",
+            "availableUnits": 0,
+            "wifi": false,
+            "laundry": true
+        },
+        {
+            "id": 2,
+            "name": "Warm Beds Housing Support",
+            "city": "Juneau",
+            "state": "AK",
+            "photo": "https://angular.dev/assets/images/tutorials/common/i-do-nothing-but-love-lAyXdl1-Wmc-unsplash.jpg",
+            "availableUnits": 1,
+            "wifi": false,
+            "laundry": false
+        },
+        {
+            "id": 3,
+            "name": "Homesteady Housing",
+            "city": "Chicago",
+            "state": "IL",
+            "photo": "https://angular.dev/assets/images/tutorials/common/ian-macdonald-W8z6aiwfi1E-unsplash.jpg",
+            "availableUnits": 1,
+            "wifi": true,
+            "laundry": false
+        },
+        {
+            "id": 4,
+            "name": "Happy Homes Group",
+            "city": "Gary",
+            "state": "IN",
+            "photo": "https://angular.dev/assets/images/tutorials/common/krzysztof-hepner-978RAXoXnH4-unsplash.jpg",
+            "availableUnits": 1,
+            "wifi": true,
+            "laundry": false
+        },
+        {
+            "id": 5,
+            "name": "Hopeful Apartment Group",
+            "city": "Oakland",
+            "state": "CA",
+            "photo": "https://angular.dev/assets/images/tutorials/common/r-architecture-JvQ0Q5IkeMM-unsplash.jpg",
+            "availableUnits": 2,
+            "wifi": true,
+            "laundry": true
+        },
+        {
+            "id": 6,
+            "name": "Seriously Safe Towns",
+            "city": "Oakland",
+            "state": "CA",
+            "photo": "https://angular.dev/assets/images/tutorials/common/phil-hearing-IYfp2Ixe9nM-unsplash.jpg",
+            "availableUnits": 5,
+            "wifi": true,
+            "laundry": true
+        },
+        {
+            "id": 7,
+            "name": "Hopeful Housing Solutions",
+            "city": "Oakland",
+            "state": "CA",
+            "photo": "https://angular.dev/assets/images/tutorials/common/r-architecture-GGupkreKwxA-unsplash.jpg",
+            "availableUnits": 2,
+            "wifi": true,
+            "laundry": true
+        },
+        {
+            "id": 8,
+            "name": "Seriously Safe Towns",
+            "city": "Oakland",
+            "state": "CA",
+            "photo": "https://angular.dev/assets/images/tutorials/common/saru-robert-9rP3mxf8qWI-unsplash.jpg",
+            "availableUnits": 10,
+            "wifi": false,
+            "laundry": false
+        },
+        {
+            "id": 9,
+            "name": "Capital Safe Towns",
+            "city": "Portland",
+            "state": "OR",
+            "photo": "https://angular.dev/assets/images/tutorials/common/webaliser-_TPTXZd9mOo-unsplash.jpg",
+            "availableUnits": 6,
+            "wifi": true,
+            "laundry": true
+        }
+    ]
+}

first-app_01-hello-world/idx/dev.nix

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+# To learn more about how to use Nix to configure your environment
+# see: https://developers.google.com/idx/guides/customize-idx-env
+{ pkgs, ... }: {
+  # Which nixpkgs channel to use.
+  channel = "stable-23.11"; # or "unstable"
+  # Use https://search.nixos.org/packages to find packages
+  packages = [
+    pkgs.nodejs_18
+  ];
+  # Sets environment variables in the workspace
+  env = {};
+  idx = {
+    # Search for the extensions you want on https://open-vsx.org/ and use "publisher.id"
+    extensions = [
+      "angular.ng-template"
+    ];
+    workspace = {
+      # Runs when a workspace is first created with this \`dev.nix\` file
+      onCreate = {
+        npm-install = "npm install --no-audit --prefer-offline";
+      };
+      # To run something each time the environment is rebuilt, use the \`onStart\` hook
+    };
+    # Enable previews and customize configuration
+    previews = {
+      enable = true;
+      previews = {
+        web = {
+          command = ["npm" "run" "start" "--" "--port" "$PORT" "--host" "0.0.0.0"];
+          manager = "web";
+        };
+      };
+    };
+  };
+}