thenify - npm Package Compare versions

Comparing version 3.0.0 to 3.1.0

index.js

@@ -7,18 +7,28 @@
 
+/**
+ * Turn async functions into promises
+ *
+ * @param {Function} $$__fn__$$
+ * @return {Function}
+ * @api public
+ */
+
 function thenify($$__fn__$$) {
   assert(typeof $$__fn__$$ === 'function')
-  var name = $$__fn__$$.name || ''
-  return eval('(function ' + name + '() {\n'
-    + 'var self = this\n'
-    + 'var len = arguments.length\n'
-    + 'var args = new Array(len + 1)\n'
-    + 'for (var i = 0; i < len; ++i) args[i] = arguments[i]\n'
-    + 'var lastIndex = i\n'
-    + 'return new Promise(function (resolve, reject) {\n'
-      + 'args[lastIndex] = createCallback(resolve, reject)\n'
-      + '$$__fn__$$.apply(self, args)\n'
-    + '})\n'
-  + '})')
+  return eval(createWraper($$__fn__$$.name))
 }
 
+/**
+ * Turn async functions into promises and backward compatible with callback
+ *
+ * @param {Function} $$__fn__$$
+ * @return {Function}
+ * @api public
+ */
+
+thenify.withCallback = function ($$__fn__$$) {
+  assert(typeof $$__fn__$$ === 'function')
+  return eval(createWraper($$__fn__$$.name, true))
+}
+
 function createCallback(resolve, reject) {
@@ -34,1 +44,21 @@ return function(err, value) {
 }
+
+function createWraper(name, withCallback) {
+  withCallback = withCallback ?
+    'var lastType = typeof arguments[len - 1]\n'
+    + 'if (lastType === "function") return $$__fn__$$.apply(self, arguments)\n'
+   : ''
+
+  return '(function ' + (name || '') + '() {\n'
+    + 'var self = this\n'
+    + 'var len = arguments.length\n'
+    + withCallback
+    + 'var args = new Array(len + 1)\n'
+    + 'for (var i = 0; i < len; ++i) args[i] = arguments[i]\n'
+    + 'var lastIndex = i\n'
+    + 'return new Promise(function (resolve, reject) {\n'
+      + 'args[lastIndex] = createCallback(resolve, reject)\n'
+      + '$$__fn__$$.apply(self, args)\n'
+    + '})\n'
+  + '})'
+}

package.json

 {
   "name": "thenify",
   "description": "Promisify a callback-based function",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "author": "Jonathan Ong <[e-mail]> (http://jongleberry.com)",
@@ -6,0 +6,0 @@ "license": "MIT",

README.md

@@ -18,2 +18,3 @@
 - Resulting function never deoptimizes
+- Supports both callback and promise style
 
@@ -24,2 +25,4 @@ An added benefit is that `throw`n errors in that async function will be caught by the promise!
 
+- Turn async functions into promises
+
 ```js
@@ -33,2 +36,15 @@ var thenify = require('thenify');
 
+- Backward compatible with callback
+
+```js
+var thenify = require('thenify').withcallback;
+
+var somethingAsync = thenify(function somethingAsync(a, b, c, callback) {
+  callback(null, a, b, c);
+});
+
+// somethingAsync(a, b, c).then(onFulfilled).catch(onRejected);
+// somethingAsync(a, b, c, function () {});
+```
+
 ### var fn = thenify(fn)
@@ -35,0 +51,0 @@

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New author

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Fixed alerts

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Improved metrics

Total package byte prevSize

5887

increased by21.93%

Lines of code

53

increased by89.29%

Number of lines in readme file

69

increased by30.19%

Worsened metrics

Number of medium supply chain risk alerts

3

increased by200%

No dependency changes