[debounce-fn] Add types

types/debounce-fn/debounce-fn-tests.ts

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+import debounceFn = require('debounce-fn');
+
+const debounced = debounceFn((s: string) => true);
+debounced; // $ExpectType ((s: string) => boolean | undefined) & { cancel(): void; }
+
+debounceFn((s: string) => true);
+debounceFn((s: string) => true, { wait: 100 });
+debounceFn((s: string) => true, { immediate: true });
+
+debounced.cancel();

types/debounce-fn/index.d.ts

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+// Type definitions for debounce-fn 1.0
+// Project: https://github.com/sindresorhus/debounce-fn#readme
+// Definitions by: BendingBender <https://github.com/BendingBender>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 3.0
+
+export = debounce;
+
+/**
+ * Returns a debounced function that delays calling the `input` function until after `wait` milliseconds
+ * have elapsed since the last time the debounced function was called.
+ *
+ * It comes with a `.cancel()` method to cancel any scheduled `input` function calls.
+ */
+declare function debounce<TArgs extends any[], TResult>(
+    input: (...args: TArgs) => TResult,
+    options?: debounce.Options
+): ((...args: TArgs) => TResult | undefined) & { cancel(): void };
+
+declare namespace debounce {
+    interface Options {
+        /**
+         * Time to wait until the `input` function is called.
+         * @default 0
+         */
+        wait?: number;
+        /**
+         * Trigger the function on the leading edge instead of the trailing edge of the `wait` interval.
+         * For example, can be useful for preventing accidental double-clicks on a "submit" button
+         * from firing a second time.
+         */
+        immediate?: boolean;
+    }
+}

types/debounce-fn/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",
+        "debounce-fn-tests.ts"
+    ]
+}

types/debounce-fn/tslint.json

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