[relay-config] Initial import (#38561)

* [relay-config] Initial import

* [relay-config] Configure tsc for linting

* [relay-config] Use TS v3

types/relay-config/index.d.ts

@@ -0,0 +1,9 @@
+// Type definitions for relay-config 6.0
+// Project: https://facebook.github.io/relay/
+// Definitions by: Eloy Durán <https://github.com/DefinitelyTyped>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+import { Config } from 'relay-compiler/lib/bin/RelayCompilerMain';
+
+export function loadConfig(): Config | undefined;

types/relay-config/relay-config-tests.ts

@@ -0,0 +1,6 @@
+import { loadConfig } from 'relay-config';
+
+const config = loadConfig();
+if (config) {
+    config.language;
+}

types/relay-config/tsconfig.json

@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6",
+            "dom",
+            "esnext.asynciterable"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "relay-config-tests.ts"
+    ]
+}

types/relay-config/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }