diff --git a/package.json b/package.json
index bd74f0cd..9eef7b93 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "indent-string": "^4.0.0",
     "lodash.merge": "^4.6.0",
     "loglevel-colored-level-prefix": "^1.0.0",
-    "prettier": "^1.7.0",
+    "prettier": "^2.0.0",
     "pretty-format": "^23.0.1",
     "require-relative": "^0.8.7",
     "typescript": "^3.2.1",
diff --git a/polyfills/trim-end.js b/polyfills/trim-end.js
new file mode 100644
index 00000000..76da6e8c
--- /dev/null
+++ b/polyfills/trim-end.js
@@ -0,0 +1,9 @@
+/**
+ * String.prototype.trimEnd() polyfill
+ * Adapted from polyfill.io
+ */
+if (!String.prototype.trimEnd) {
+	String.prototype.trimEnd = function () {
+		return this.replace(new RegExp(/[\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF]+/.source + '$', 'g'), '');
+	};
+}
diff --git a/polyfills/trim-start.js b/polyfills/trim-start.js
new file mode 100644
index 00000000..3e7870d2
--- /dev/null
+++ b/polyfills/trim-start.js
@@ -0,0 +1,9 @@
+/**
+ * String.prototype.trimStart() polyfill
+ * Adapted from polyfill.io
+ */
+if (!String.prototype.trimStart) {
+	String.prototype.trimStart = function () {
+		return this.replace(new RegExp('^' + /[\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF]+/.source, 'g'), '');
+	};
+}
diff --git a/polyfills/trim.js b/polyfills/trim.js
new file mode 100644
index 00000000..060a6456
--- /dev/null
+++ b/polyfills/trim.js
@@ -0,0 +1,9 @@
+/**
+ * String.prototype.trim() polyfill
+ * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/Trim#Polyfill
+ */
+if (!String.prototype.trim) {
+	String.prototype.trim = function () {
+		return this.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
+	};
+}
diff --git a/src/index.js b/src/index.js
index 0014d55e..4b258e48 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,5 +1,11 @@
 /* eslint no-console:0, global-require:0, import/no-dynamic-require:0 */
 /* eslint complexity: [1, 13] */
+
+// Add node 8 polyfills
+import '../polyfills/trim';
+import '../polyfills/trim-start';
+import '../polyfills/trim-end';
+
 import fs from 'fs';
 import path from 'path';
 import requireRelative from 'require-relative';