Add types for ensure-error

types/ensure-error/ensure-error-tests.ts

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+import ensureError = require('ensure-error');
+
+const error = new TypeError('🦄');
+
+// $ExpectType TypeError
+ensureError(error);
+
+// $ExpectType NonError
+ensureError(10);

types/ensure-error/index.d.ts

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+// Type definitions for ensure-error 1.0
+// Project: https://github.com/sindresorhus/ensure-error#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+export = ensureError;
+
+declare function ensureError<T>(input: T): T extends Error ? T : ensureError.NonError;
+
+declare namespace ensureError {
+    interface NonError extends Error {
+        name: 'NonError';
+    }
+}

types/ensure-error/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",
+        "ensure-error-tests.ts"
+    ]
+}

types/ensure-error/tslint.json

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