diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..1937215
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,19 @@
+# EditorConfig is awesome: https://editorconfig.org/
+
+# top-most EditorConfig file
+root = true
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.js]
+trim_trailing_whitespace = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+max_line_length = 100
diff --git a/cacheWrap.js b/cacheWrap.js
new file mode 100644
index 0000000..87e10f8
--- /dev/null
+++ b/cacheWrap.js
@@ -0,0 +1,29 @@
+var path = require('path')
+
+function cacheWrap(read, cache, async) {
+  // resolve all cached files such that they match
+  // all of the paths glslify handles, which are otherwise
+  // absolute
+  cache = Object.keys(cache).reduce(function(newCache, file) {
+    newCache[path.resolve(file)] = cache[file]
+    return newCache
+  }, {})
+
+  return function readFromCache(filename, done) {
+    if (!cache[filename]) {
+      if (async) {
+        return read(filename, done)
+      }
+      cache[filename] = read(filename)
+    }
+
+    if (async) {
+      return process.nextTick(function() {
+        done(null, cache[filename])
+      })
+    }
+    return cache[filename]
+  }
+}
+
+module.exports = cacheWrap;
diff --git a/common.js b/common.js
new file mode 100644
index 0000000..0ea8901
--- /dev/null
+++ b/common.js
@@ -0,0 +1,22 @@
+function glslifyPreprocessor(data) {
+    return /#pragma glslify:/.test(data)
+  }
+
+function glslifyExport(data) {
+  return /#pragma glslify:\s*export\(([^\)]+)\)/.exec(data)
+}
+
+function glslifyImport(data) {
+  return /#pragma glslify:\s*([^=\s]+)\s*=\s*require\(([^\)]+)\)/.exec(data)
+}
+
+function genInlineName() {
+  return '__INLINE__' + Math.random()
+}
+
+module.exports = {
+  glslifyPreprocessor,
+  glslifyExport,
+  glslifyImport,
+  genInlineName,
+};
diff --git a/index.js b/index.js
index a0ecbb4..12544f4 100644
--- a/index.js
+++ b/index.js
@@ -5,11 +5,17 @@ var map      = require('map-limit')
 var inherits = require('inherits')
 var Emitter  = require('events/')
 var path     = require('path')
-
 var glslResolve = require('glsl-resolve')
 var nodeResolve = require('resolve')
-
-var inlineName   = '__INLINE__' + Math.random()
+var cacheWrap = require('./cacheWrap');
+var {
+  glslifyPreprocessor,
+  glslifyExport,
+  glslifyImport,
+  genInlineName,
+} = require('./common.js')
+
+var inlineName   = genInlineName()
 var inlineSource = ''
 
 module.exports = Depper
@@ -39,7 +45,7 @@ function Depper(opts) {
 
   this._globalTransforms = []
 
-  this._readFile = cacheWrap(opts.readFile || defaultRead, this._fileCache)
+  this._readFile = cacheWrap(opts.readFile || defaultRead, this._fileCache, true)
   this.resolve   = opts.resolve || glslResolve
 
   if (typeof this._cwd !== 'string') {
@@ -325,38 +331,6 @@ Depper.prototype.applyTransforms = function(filename, src, transforms, done) {
   }
 }
 
-function glslifyPreprocessor(data) {
-  return /#pragma glslify:/.test(data)
-}
-
-function glslifyExport(data) {
-  return /#pragma glslify:\s*export\(([^\)]+)\)/.exec(data)
-}
-
-function glslifyImport(data) {
-  return /#pragma glslify:\s*([^=\s]+)\s*=\s*require\(([^\)]+)\)/.exec(data)
-}
-
 function defaultRead(src, done) {
   fs.readFile(src, 'utf8', done)
 }
-
-function cacheWrap(read, cache) {
-  // resolve all cached files such that they match
-  // all of the paths glslify handles, which are otherwise
-  // absolute
-  cache = Object.keys(cache).reduce(function(newCache, file) {
-    newCache[path.resolve(file)] = cache[file]
-    return newCache
-  }, {})
-
-  return function readFromCache(filename, done) {
-    if (!cache[filename]) {
-      return read(filename, done)
-    }
-
-    process.nextTick(function() {
-      done(null, cache[filename])
-    })
-  }
-}
diff --git a/sync.js b/sync.js
index 54fe512..4bb36e7 100644
--- a/sync.js
+++ b/sync.js
@@ -5,11 +5,17 @@ var map      = require('map-limit')
 var inherits = require('inherits')
 var Emitter  = require('events/')
 var path     = require('path')
-
+var cacheWrap = require('./cacheWrap');
 var glslResolve = require('glsl-resolve').sync
 var nodeResolve = require('resolve').sync
-
-var inlineName   = '__INLINE__' + Math.random()
+var {
+  glslifyPreprocessor,
+  glslifyExport,
+  glslifyImport,
+  genInlineName
+} = require('./common.js')
+
+var inlineName   = genInlineName()
 var inlineSource = ''
 
 module.exports = Depper
@@ -66,7 +72,7 @@ Depper.prototype.inline = function(source, basedir) {
  *   return src.toUpperCase()
  * }
  * ```
- * 
+ *
  * This is also different from the async transform API.
  *
  * Where `filename` is the absolute file path, `src` is the shader source
@@ -293,35 +299,6 @@ Depper.prototype.applyTransforms = function(filename, src, transforms) {
   return src
 }
 
-function glslifyPreprocessor(data) {
-  return /#pragma glslify:/.test(data)
-}
-
-function glslifyExport(data) {
-  return /#pragma glslify:\s*export\(([^\)]+)\)/.exec(data)
-}
-
-function glslifyImport(data) {
-  return /#pragma glslify:\s*([^=\s]+)\s*=\s*require\(([^\)]+)\)/.exec(data)
-}
-
 function defaultRead(src) {
   return fs.readFileSync(src, 'utf8')
 }
-
-function cacheWrap(read, cache) {
-  // resolve all cached files such that they match
-  // all of the paths glslify handles, which are otherwise
-  // absolute
-  cache = Object.keys(cache).reduce(function(newCache, file) {
-    newCache[path.resolve(file)] = cache[file]
-    return newCache
-  }, {})
-
-  return function readFromCache(filename) {
-    if (!cache[filename]) {
-      cache[filename] = read(filename)
-    }
-    return cache[filename]
-  }
-}