diff --git a/.terserrc.js b/.terserrc.js
index 992fd111..27b4073b 100644
--- a/.terserrc.js
+++ b/.terserrc.js
@@ -10,7 +10,7 @@ export default {
       "@atom.inSpecMode": !isTest ? "() => false" : "() => true"
     },
     "ecma": "2018", // Change based on the target
-    // "toplevel": true, // controlled by Parcel
+    "toplevel": false,
     "hoist_vars": false,
     "hoist_funs": true,
     "pure_getters": true,
diff --git a/lib/decoration-management.js b/lib/decoration-management.js
index d8fe7ff0..a4b096a5 100644
--- a/lib/decoration-management.js
+++ b/lib/decoration-management.js
@@ -1,7 +1,7 @@
 'use strict'
 
 import { Emitter } from 'atom'
-import { escapeRegExp } from 'underscore-plus'
+import { escapeRegExp } from './deps/underscore-plus'
 import path from 'path'
 import Decoration from './decoration'
 
diff --git a/lib/deps/underscore-plus.js b/lib/deps/underscore-plus.js
new file mode 100644
index 00000000..194c3dcd
--- /dev/null
+++ b/lib/deps/underscore-plus.js
@@ -0,0 +1,22 @@
+const regexEscape = /[-/\\^$*+?.()|[\]{}]/g
+export function escapeRegExp (string) {
+  if (string) {
+    return string.replace(regexEscape, '\\$&')
+  } else {
+    return ''
+  }
+}
+
+const regexDaherize = /([A-Z])|(_)/g
+export function dasherize (string) {
+  if (!string) { return '' }
+
+  string = `${string[0].toLowerCase()}${string.slice(1)}`
+  return string.replace(regexDaherize, function (m, letter) {
+    if (letter) {
+      return `-${letter.toLowerCase()}`
+    } else {
+      return '-'
+    }
+  })
+}
diff --git a/lib/minimap-plugin-generator-element.js b/lib/minimap-plugin-generator-element.js
index 81a3bbb5..49d190d3 100644
--- a/lib/minimap-plugin-generator-element.js
+++ b/lib/minimap-plugin-generator-element.js
@@ -1,6 +1,6 @@
 'use strict'
 
-import { dasherize } from 'underscore-plus'
+import { dasherize } from './deps/underscore-plus'
 import { getHomeDirectory, existsSync } from 'fs-plus'
 import path from 'path'
 import { BufferedProcess } from 'atom'
diff --git a/lib/mixins/canvas-drawer.js b/lib/mixins/canvas-drawer.js
index ee039897..8227d42a 100644
--- a/lib/mixins/canvas-drawer.js
+++ b/lib/mixins/canvas-drawer.js
@@ -1,6 +1,6 @@
 'use strict'
 
-import { escapeRegExp } from 'underscore-plus'
+import { escapeRegExp } from '../deps/underscore-plus'
 import Mixin from 'mixto'
 
 import * as Main from '../main'
diff --git a/package.json b/package.json
index a8efa5c9..0770a660 100644
--- a/package.json
+++ b/package.json
@@ -59,8 +59,7 @@
     "delegato": "^1.0.0",
     "element-resize-detector": "^1.2.1",
     "fs-plus": "^3.1.1",
-    "mixto": "^1.0.0",
-    "underscore-plus": "^1.7.0"
+    "mixto": "^1.0.0"
   },
   "devDependencies": {
     "@types/atom": "^1.40.5",
@@ -74,7 +73,8 @@
     "rollup": "2.36.1",
     "rollup-plugin-atomic": "^2.0.1",
     "shx": "^0.3.3",
-    "standard": "^16.0.3"
+    "standard": "^16.0.3",
+    "underscore-plus": "^1.7.0"
   },
   "standard": {
     "globals": [