Add type definitions for math-trunc.

types/math-trunc/index.d.ts

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+// Type definitions for math-trunc 1.0
+// Project: https://github.com/kevva/math-trunc#readme
+// Definitions by: Daniel Cassidy <https://github.com/djcsdy>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare function trunc(val: number): number;
+
+export = trunc;

types/math-trunc/math-trunc-tests.ts

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+import trunc = require("math-trunc");
+
+// $ExpectType number
+trunc(13.37);
+
+// $ExpectType number
+trunc(-0.123);

types/math-trunc/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",
+        "math-trunc-tests.ts"
+    ]
+}

types/math-trunc/tslint.json

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