Upgrade bundler.

make.js

@@ -1,5 +1,6 @@
 /* eslint-disable no-template-curly-in-string */
 const b = require('substance-bundler')
+const rollup = require('substance-bundler/extensions/rollup')
 
 const DIST = 'dist/'
 const TMP = 'tmp/'
@@ -20,7 +21,8 @@ b.task('default', ['publish'])
 b.task('build', ['build:lib'])
 
 b.task('build:lib', () => {
-  b.js('index.es.js', {
+  rollup(b, {
+    input: 'index.es.js',
     output: [{
       file: DIST + 'texture-xml-utils.js',
       format: 'umd',
@@ -31,25 +33,26 @@ b.task('build:lib', () => {
     }, {
       file: DIST + 'texture-xml-utils.cjs.js',
       format: 'cjs'
+    }, {
+      file: DIST + 'texture-xml-utils.es.js',
+      format: 'esm'
     }],
     external: [ 'substance' ]
   })
-  b.minify(DIST + 'texture-xml-utils.js', {
-    debug: false
-  })
 })
 
 b.task('build:tests:browser', () => {
-  b.js('test/index.js', {
-    output: [{
+  rollup(b, {
+    input: 'test/index.js',
+    output: {
       file: TMP + 'tests.js',
       format: 'umd',
       name: 'tests',
       globals: {
         'substance': 'substance',
         'substance-test': 'substanceTest'
       }
-    }],
+    },
     external: [ 'substance', 'substance-test' ]
   })
 })

package.json

@@ -28,9 +28,10 @@
   "devDependencies": {
     "esm": "3.0.47",
     "nyc": "11.8.0",
+    "rollup": "^1.20.3",
     "standard": "12.0.1",
     "substance": "0.142.0",
-    "substance-bundler": "0.25.5",
+    "substance-bundler": "^0.27.1",
     "substance-test": "0.13.2",
     "tap-spec": "5.0.0",
     "uglify-es": "3.3.9"