From feb90a40501c8ef69b0c65bdf1eb703182214407 Mon Sep 17 00:00:00 2001
From: Forbes Lindesay <forbes@lindesay.co.uk>
Date: Sat, 25 Apr 2020 16:01:45 +0100
Subject: [PATCH] feat: support type narrowing via isPromise and default export

---
 index.d.ts   | 4 ++--
 index.js     | 1 +
 index.mjs    | 3 +++
 package.json | 9 +++++++--
 4 files changed, 13 insertions(+), 4 deletions(-)
 create mode 100644 index.mjs

diff --git a/index.d.ts b/index.d.ts
index a3d4b0d..bf76299 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,2 +1,2 @@
-declare function isPromise(obj: any): boolean;
-export = isPromise;
\ No newline at end of file
+declare function isPromise<T, S>(obj: Promise<T> | S): obj is Promise<T>;
+export default isPromise;
\ No newline at end of file
diff --git a/index.js b/index.js
index ca2444c..1bed087 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,5 @@
 module.exports = isPromise;
+module.exports.default = isPromise;
 
 function isPromise(obj) {
   return !!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
diff --git a/index.mjs b/index.mjs
new file mode 100644
index 0000000..bf9e99b
--- /dev/null
+++ b/index.mjs
@@ -0,0 +1,3 @@
+export default function isPromise(obj) {
+  return !!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
+}
diff --git a/package.json b/package.json
index 7e55dfe..100a512 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,11 @@
   "version": "2.1.0",
   "description": "Test whether an object looks like a promises-a+ promise",
   "main": "index.js",
+  "type": "module",
+  "exports": {
+    "import": "index.mjs",
+    "require": "index.js"
+  },
   "scripts": {
     "test": "mocha -R spec"
   },
@@ -16,7 +21,7 @@
   "author": "ForbesLindesay",
   "license": "MIT",
   "devDependencies": {
-    "better-assert": "~0.1.0",
-    "mocha": "~1.7.4"
+    "better-assert": "^1.0.2",
+    "mocha": "^7.1.1"
   }
 }