Fix build errors across browserify and webpack. see:

vicapow/react-map-gl-heatmap-overlay#2

heatmap-heights.js

@@ -1,8 +1,12 @@
 'use strict';
 
 var HeatmapShader = require('./heatmap-shader');
-var vertexShaderBlit = require('./vertex-shader-blit.glsl');
-var fragmentShaderBlit = require('./fragment-shader-blit.glsl');
+var fs = require('fs');
+var path = require('path');
+/* eslint-disable max-len */
+var vertexShaderBlit = fs.readFileSync(path.join(__dirname, './vertex-shader-blit.glsl'), 'utf-8');
+var fragmentShaderBlit = fs.readFileSync(path.join(__dirname, './fragment-shader-blit.glsl'), 'utf-8');
+/* eslint-enable max-len */
 var HeatmapNode = require('./heatmap-node');
 
 function HeatmapHeights(heatmap, gl, width, height) {

package.json

@@ -19,18 +19,11 @@
   "author": "Victor Powell <[email protected]>",
   "license": "MIT",
   "dependencies": {
-    "browserify-shader": "^0.1.2",
     "brfs": "^1.4.1",
     "global": "^4.3.0"
   },
   "browserify": {
     "transform": [
-      [
-        "browserify-shader",
-        {
-          "parameterize": false
-        }
-      ],
       "brfs"
     ]
   },

webgl-heatmap.js

@@ -2,8 +2,12 @@
 
 var document = require('global/document');
 var window = require('global/window');
-var vertexShaderBlit = require('./vertex-shader-blit.glsl');
-var fragmentShaderBlit = require('./fragment-shader-blit.glsl');
+var fs = require('fs');
+var path = require('path');
+/* eslint-disable max-len */
+var vertexShaderBlit = fs.readFileSync(path.join(__dirname, './vertex-shader-blit.glsl'), 'utf-8');
+var fragmentShaderBlit = fs.readFileSync(path.join(__dirname, './fragment-shader-blit.glsl'), 'utf-8');
+/* eslint-enable max-len */
 var HeatmapTexture = require('./heatmap-texture');
 var HeatmapHeights = require('./heatmap-heights');
 var HeatmapShader = require('./heatmap-shader');