🤖 Merge PR #65746 [is-firefox] Add types by @e9x

* [is-firefox] Add types

* [is-firefox] correctly export boolean

types/is-firefox/index.d.ts

@@ -0,0 +1,8 @@
+// Type definitions for is-firefox 1.0
+// Project: https://github.com/gillstrom/is-firefox#readme
+// Definitions by: David Reed <https://github.com/e9x>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare const isFirefox: boolean;
+
+export = isFirefox;

types/is-firefox/is-firefox-tests.ts

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+import isFirefox = require('is-firefox');
+
+isFirefox; // $ExpectType boolean

types/is-firefox/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",
+        "is-firefox-tests.ts"
+    ]
+}

types/is-firefox/tslint.json

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