Add types for find-down

types/find-down/find-down-tests.ts

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+import findDown = require('find-down');
+
+findDown('unicorn.png').then(file => {
+    file; // $ExpectType string | null
+});
+
+findDown(['unicorn.png']).then(file => {
+    file; // $ExpectType string | null
+});
+
+findDown('unicorn.png', { cwd: '.' }).then(file => {
+    file; // $ExpectType string | null
+});

types/find-down/index.d.ts

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+// Type definitions for find-down 0.1
+// Project: https://github.com/sholladay/find-down
+// Definitions by: Florian Keller <https://github.com/ffflorian>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare namespace findDown {
+    interface Options {
+        /** Directory to end with. Default: `process.cwd()` */
+        cwd?: string;
+    }
+}
+
+declare function findDown(filename: string | string[], options?: findDown.Options): Promise<string | null>;
+
+export = findDown;

types/find-down/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",
+        "find-down-tests.ts"
+    ]
+}

types/find-down/tslint.json

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