[has-yarn] Add types

types/has-yarn/has-yarn-tests.ts

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+import hasYarn = require('has-yarn');
+
+// $ExpectType boolean
+hasYarn('foo');

types/has-yarn/index.d.ts

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+// Type definitions for has-yarn 1.0
+// Project: https://github.com/sindresorhus/has-yarn#readme
+// Definitions by: BendingBender <https://github.com/BendgingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export = hasYarn;
+
+declare function hasYarn(cwd?: string): boolean;

types/has-yarn/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",
+        "has-yarn-tests.ts"
+    ]
+}

types/has-yarn/tslint.json

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