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eslint.config.mjs

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+import nx from '@nx/eslint-plugin';
+
+export default [
+  ...nx.configs['flat/base'],
+  ...nx.configs['flat/typescript'],
+  ...nx.configs['flat/javascript'],
+  {
+    ignores: ['**/dist', '**/out-tsc', '**/vitest.config.*.timestamp*'],
+  },
+  {
+    files: ['**/*.ts', '**/*.tsx', '**/*.js', '**/*.jsx'],
+    rules: {
+      '@nx/enforce-module-boundaries': [
+        'error',
+        {
+          enforceBuildableLibDependency: true,
+          allow: ['^.*/eslint(\\.base)?\\.config\\.[cm]?[jt]s$'],
+          depConstraints: [
+            // Hexagonal layers: dependencies only point inwards.
+            {
+              // Pure model. Only @nestjs/common (@Injectable factories) and
+              // @nestjs/cqrs (AggregateRoot) are allowed.
+              sourceTag: 'type:domain',
+              onlyDependOnLibsWithTags: ['type:domain'],
+              bannedExternalImports: [
+                '@nestjs/core',
+                '@nestjs/config',
+                '@nestjs/typeorm',
+                '@nestjs/mongoose',
+                '@nestjs/graphql',
+                '@nestjs/apollo',
+                'typeorm',
+                'mongoose',
+                'ioredis',
+                'graphql*',
+                'pg',
+                '@angular/*',
+                '@ngrx/*',
+                '@apollo/*',
+                'apollo-angular',
+                '@pi/ui',
+              ],
+            },
+            {
+              // Use cases: services + CQRS handlers + ports.
+              sourceTag: 'type:application',
+              onlyDependOnLibsWithTags: ['type:domain', 'type:application'],
+              bannedExternalImports: [
+                'typeorm',
+                'mongoose',
+                'ioredis',
+                'graphql*',
+                'pg',
+                '@nestjs/typeorm',
+                '@nestjs/mongoose',
+                '@nestjs/graphql',
+                '@apollo/*',
+                'apollo-angular',
+                '@pi/ui',
+              ],
+            },
+            {
+              // Driving adapters (GraphQL, HTTP): talk to application services only.
+              sourceTag: 'type:presenters',
+              onlyDependOnLibsWithTags: [
+                'type:domain',
+                'type:application',
+                'type:presenters',
+              ],
+              bannedExternalImports: [
+                'typeorm',
+                'mongoose',
+                'ioredis',
+                'pg',
+                '@nestjs/typeorm',
+                '@nestjs/mongoose',
+                '@nestjs/cqrs',
+                'graphql-redis-subscriptions',
+                '@apollo/*',
+                'apollo-angular',
+              ],
+            },
+            {
+              // Driven adapters (Postgres, Mongo, Redis, Pireon). Never presenters.
+              sourceTag: 'type:infrastructure',
+              onlyDependOnLibsWithTags: [
+                'type:domain',
+                'type:application',
+                'type:infrastructure',
+              ],
+            },
+            {
+              sourceTag: 'type:app',
+              onlyDependOnLibsWithTags: ['*'],
+            },
+            // API (NestJS) bounded contexts. Never depend on the web client.
+            {
+              sourceTag: 'scope:api',
+              onlyDependOnLibsWithTags: ['scope:api-shared', 'scope:api-identity', 'scope:api-tracker'],
+            },
+            {
+              sourceTag: 'scope:api-shared',
+              onlyDependOnLibsWithTags: ['scope:api-shared'],
+            },
+            {
+              sourceTag: 'scope:api-identity',
+              onlyDependOnLibsWithTags: ['scope:api-identity', 'scope:api-shared'],
+            },
+            {
+              sourceTag: 'scope:api-tracker',
+              onlyDependOnLibsWithTags: ['scope:api-tracker', 'scope:api-identity', 'scope:api-shared'],
+            },
+            // Web client (Angular). Never depends on backend libraries.
+            {
+              sourceTag: 'scope:web',
+              onlyDependOnLibsWithTags: ['scope:web-shared', 'scope:web-identity', 'scope:web-tracker'],
+            },
+            {
+              sourceTag: 'scope:web-shared',
+              onlyDependOnLibsWithTags: ['scope:web-shared'],
+            },
+            {
+              sourceTag: 'scope:web-identity',
+              onlyDependOnLibsWithTags: ['scope:web-identity', 'scope:web-shared'],
+            },
+            {
+              sourceTag: 'scope:web-tracker',
+              onlyDependOnLibsWithTags: ['scope:web-tracker', 'scope:web-identity', 'scope:web-shared'],
+            },
+          ],
+        },
+      ],
+    },
+  },
+  {
+    files: [
+      '**/*.ts',
+      '**/*.tsx',
+      '**/*.cts',
+      '**/*.mts',
+      '**/*.js',
+      '**/*.jsx',
+      '**/*.cjs',
+      '**/*.mjs',
+    ],
+    rules: {
+      '@typescript-eslint/no-unused-vars': [
+        'warn',
+        {
+          ignoreRestSiblings: true,
+          argsIgnorePattern: '^_',
+          varsIgnorePattern: '^_',
+        },
+      ],
+    },
+  },
+];