Add type definitions for imul.

types/imul/imul-tests.ts

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+import imul = require("imul");
+
+// $ExpectType number
+imul(2, 4);

types/imul/index.d.ts

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+// Type definitions for imul 1.0
+// Project: https://github.com/sindresorhus/imul#readme
+// Definitions by: Daniel Cassidy <https://github.com/djcsdy>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function imul(a: number, b: number): number;
+
+export = imul;

types/imul/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",
+        "imul-tests.ts"
+    ]
+}

types/imul/tslint.json

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