add types for merge-env (#30629)

types/merge-env/index.d.ts

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+// Type definitions for merge-env 1.0
+// Project: https://github.com/bholloway/merge-env
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+export = mergeEnv;
+
+declare function mergeEnv(target: object, ...sources: any[]): any;

types/merge-env/merge-env-tests.ts

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+import mergeEnv = require("merge-env");
+
+const mergedConfiguration = mergeEnv({}, {}, {});

types/merge-env/tsconfig.json

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

types/merge-env/tslint.json

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