Use immediate in browsers, setImmediate in Node (#61)

immediate-browser.js

@@ -0,0 +1 @@
+module.exports = require('immediate')

immediate.js

@@ -0,0 +1 @@
+module.exports = setImmediate

memdown.js

@@ -4,8 +4,10 @@ var inherits          = require('inherits')
   , ltgt              = require('ltgt')
   , createRBT = require('functional-red-black-tree')
   , globalStore       = {}
-/* istanbul ignore next */
-var setImmediate = global.setImmediate || process.nextTick
+
+// In Node, use global.setImmediate. In the browser, use a consistent
+// microtask library to give consistent microtask experience to all browsers
+var setImmediate = require('./immediate')
 
 function gt(value) {
   return ltgt.compare(value, this._end) > 0

package.json

@@ -21,10 +21,11 @@
     "url": "https://github.com/Level/memdown.git"
   },
   "dependencies": {
-    "inherits": "~2.0.1",
-    "ltgt": "~2.1.3",
+    "abstract-leveldown": "2.4.1",
     "functional-red-black-tree": "^1.0.1",
-    "abstract-leveldown": "2.4.1"
+    "immediate": "^3.2.3",
+    "inherits": "~2.0.1",
+    "ltgt": "~2.1.3"
   },
   "devDependencies": {
     "bench": "*",
@@ -37,7 +38,8 @@
     "zuul": "^3.9.0"
   },
   "browser": {
-    "rimraf": false
+    "rimraf": false,
+    "./immediate.js": "./immediate-browser.js"
   },
   "scripts": {
     "test": "npm run lint && node ./test.js --stderr | faucet",