Add types for direction (#41512)

types/direction/direction-tests.ts

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+import direction = require('direction');
+
+direction('anglais'); // $ExpectType Direction
+direction('بسيطة'); // $ExpectType Direction
+direction('?'); // $ExpectType Direction

types/direction/index.d.ts

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+// Type definitions for direction 1.0
+// Project: https://github.com/wooorm/direction#readme
+// Definitions by: Andrey Romanov <https://github.com/andrew--r>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace direction {
+    type Direction = 'ltr' | 'rtl' | 'neutral';
+}
+
+/**
+ * Detect direction: left-to-right, right-to-left, or neutral.
+ *
+ * @example
+ * ```
+ * direction('anglais') // => 'ltr'
+ * direction('بسيطة') // => 'rtl'
+ * direction('?') // => 'neutral'
+ * ```
+ */
+declare function direction(value: string): direction.Direction;
+export = direction;

types/direction/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "direction-tests.ts"
+    ]
+}

types/direction/tslint.json

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+{ "extends": "dtslint/dt.json" }