first commit

build/node_modules/imagemin-upng/index.js

@@ -0,0 +1,37 @@
+'use strict'
+
+var UPNG = require('upng-js')
+var isPng = require('is-png')
+var defaultOptions = {
+  cnum: 256
+}
+
+module.exports = function(options) {
+  options = Object.assign({}, defaultOptions, options)
+
+  return function(input) {
+    if (!Buffer.isBuffer(input)) {
+      return Promise.reject(new TypeError('Expected a buffer'))
+    }
+
+    if (!isPng(input)) {
+      return Promise.resolve(input)
+    }
+
+    var img = UPNG.decode(input)
+
+    var output = Buffer.from(
+      UPNG.encode(
+        UPNG.toRGBA8(img),
+        img.width,
+        img.height,
+        options.cnum,
+        img.frames.map(function(frame) {
+          return frame.delay
+        })
+      )
+    )
+
+    return Promise.resolve(output)
+  }
+}