add typescript typings

index.d.ts

@@ -0,0 +1,32 @@
+declare global {
+  namespace jest {
+    interface Matchers<R> {
+      toBeDeepCloseTo: (
+        expected: number | number[] | object,
+        decimals?: number
+      ) => R;
+      toMatchCloseTo: (
+        expected: number | number[] | object,
+        decimals?: number
+      ) => R;
+    }
+  }
+}
+
+export function toBeDeepCloseTo(
+  received: number | number[] | object,
+  expected: number | number[] | object,
+  decimals?: number
+): {
+  message(): string;
+  pass: boolean;
+}
+
+export function toMatchCloseTo(
+  received: number | number[] | object,
+  expected: number | number[] | object,
+  decimals?: number
+): {
+  message(): string;
+  pass: boolean;
+}

package.json

@@ -4,9 +4,11 @@
   "description": "Extend jest to assert arrays with approximate values",
   "main": "lib/index.js",
   "module": "src/index.js",
+  "types": "index.d.ts",
   "files": [
     "lib",
-    "src"
+    "src",
+    "index.d.ts"
   ],
   "scripts": {
     "eslint": "eslint src",