Add eslint-plugin-relay rules (warning only)

Signed-off-by: Émile Ré <emile@getprobo.com>

packages/eslint-config/package.json

@@ -14,6 +14,7 @@
     "#baseConfigs": "./src/baseConfigs.ts",
     "#tsConfigs": "./src/tsConfigs.ts",
     "#reactConfigs": "./src/reactConfigs.ts",
+    "#relayConfigs": "./src/relayConfigs.ts",
     "#importsConfigs": "./src/importsConfigs.ts",
     "#languageOptionsConfigs": "./src/languageOptionsConfigs.ts",
     "#stylisticConfigs": "./src/stylisticConfigs.ts"
@@ -30,10 +31,12 @@
     "eslint-plugin-import-x": "^4.16.1",
     "eslint-plugin-react": "^7.37.5",
     "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-relay": "^2.0.0",
     "globals": "^17.0.0",
     "typescript-eslint": "^8.53.1"
   },
   "devDependencies": {
+    "@types/eslint-plugin-relay": "^1.0.0",
     "eslint": "^9.39.2",
     "typescript": "^5.8.3"
   }

packages/eslint-config/src/index.ts

@@ -2,6 +2,7 @@ import { baseConfigs } from "#baseConfigs";
 import { importsConfigs } from "#importsConfigs";
 import { browserLanguageOptionsConfigs, nodeLanguageOptionsConfigs } from "#languageOptionsConfigs";
 import { reactConfigs } from "#reactConfigs";
+import { relayConfigs } from "#relayConfigs";
 import { stylisticConfigs } from "#stylisticConfigs";
 import { tsConfigs } from "#tsConfigs";
 
@@ -10,6 +11,7 @@ export const configs = {
   imports: importsConfigs,
   ts: tsConfigs,
   react: reactConfigs,
+  relay: relayConfigs,
   stylistic: stylisticConfigs,
   languageOptions: {
     browser: browserLanguageOptionsConfigs,

packages/eslint-config/src/relayConfigs.ts

@@ -0,0 +1,11 @@
+import relay from "eslint-plugin-relay";
+import type { FlatConfig } from "typescript-eslint";
+
+export const relayConfigs: FlatConfig.ConfigArray = [
+  {
+    plugins: {
+      relay: relay,
+    },
+    ...relay.configs["ts-recommended"],
+  },
+];

packages/eslint-relay-plugin/index.d.ts

@@ -0,0 +1,29 @@
+declare module "eslint-plugin-relay" {
+  import type { Linter, Rule } from "eslint";
+
+  export const rules: {
+    "graphql-syntax": Rule.RuleModule;
+    "graphql-naming": Rule.RuleModule;
+    "generated-typescript-types": Rule.RuleModule;
+    "no-future-added-value": Rule.RuleModule;
+    "unused-fields": Rule.RuleModule;
+    "must-colocate-fragment-spreads": Rule.RuleModule;
+    "function-required-argument": Rule.RuleModule;
+    "hook-required-argument": Rule.RuleModule;
+  };
+
+  export const configs: {
+    recommended: {
+      rules: Linter.RulesRecord;
+    };
+    "ts-recommended": {
+      rules: Linter.RulesRecord;
+    };
+    strict: {
+      rules: Linter.RulesRecord;
+    };
+    "ts-strict": {
+      rules: Linter.RulesRecord;
+    };
+  };
+}

packages/eslint-relay-plugin/package.json

@@ -0,0 +1,7 @@
+{
+  "name": "@types/eslint-plugin-relay",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Shared ESLint configuration for Probo monorepo",
+  "types": "./index.d.ts"
+}