Add types for get-certain

types/get-certain/get-certain-tests.ts

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+import getCertain = require('get-certain');
+
+const map = new Map<string, number>();
+
+map.set('foo', 1);
+
+// $ExpectType number
+getCertain(map, 'foo');
+getCertain(map, 'bar', 'This map is barless.');

types/get-certain/index.d.ts

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+// Type definitions for get-certain 1.0
+// Project: https://github.com/wtgtybhertgeghgtwtg/get-certain#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = getCertain;
+
+declare function getCertain<TKey, TValue>(
+    map: Map<TKey, TValue>,
+    key: TKey,
+    message?: string
+): TValue;

types/get-certain/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",
+        "get-certain-tests.ts"
+    ]
+}

types/get-certain/tslint.json

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