From 3efbf07f3310c0846afc038cddddefae72d98dde Mon Sep 17 00:00:00 2001
From: Egill <egillsigurdur@gmail.com>
Date: Sun, 12 Aug 2018 23:51:16 +0000
Subject: [PATCH] Switch from ES6 to ES5 to ensure compatability.
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**Runes** is not compiled with Babel, which leads to some difficulty when depending on it.

It is currently [not possible](https://github.com/facebook/create-react-app/blob/master/packages/react-scripts/template/README.md#npm-run-build-fails-to-minify) to use `runes` in projects using `create-react-app`.

The only ES6 features being used by **runes** are `const` and `let`. I therefore suggest that we switch to ES5, or add a compile step.
---
 index.js | 50 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/index.js b/index.js
index 16a5f38..4cb598d 100644
--- a/index.js
+++ b/index.js
@@ -1,25 +1,25 @@
 'use strict'
 
-const HIGH_SURROGATE_START = 0xd800
-const HIGH_SURROGATE_END = 0xdbff
+var HIGH_SURROGATE_START = 0xd800
+var HIGH_SURROGATE_END = 0xdbff
 
-const LOW_SURROGATE_START = 0xdc00
+var LOW_SURROGATE_START = 0xdc00
 
-const REGIONAL_INDICATOR_START = 0x1f1e6
-const REGIONAL_INDICATOR_END = 0x1f1ff
+var REGIONAL_INDICATOR_START = 0x1f1e6
+var REGIONAL_INDICATOR_END = 0x1f1ff
 
-const FITZPATRICK_MODIFIER_START = 0x1f3fb
-const FITZPATRICK_MODIFIER_END = 0x1f3ff
+var FITZPATRICK_MODIFIER_START = 0x1f3fb
+var FITZPATRICK_MODIFIER_END = 0x1f3ff
 
-const VARIATION_MODIFIER_START = 0xfe00
-const VARIATION_MODIFIER_END = 0xfe0f
+var VARIATION_MODIFIER_START = 0xfe00
+var VARIATION_MODIFIER_END = 0xfe0f
 
-const DIACRITICAL_MARKS_START = 0x20d0
-const DIACRITICAL_MARKS_END = 0x20ff
+var DIACRITICAL_MARKS_START = 0x20d0
+var DIACRITICAL_MARKS_END = 0x20ff
 
-const ZWJ = 0x200d
+var ZWJ = 0x200d
 
-const GRAPHEMS = [
+var GRAPHEMS = [
   0x0308, // ( ◌̈ ) COMBINING DIAERESIS
   0x0937, // ( ष ) DEVANAGARI LETTER SSA
   0x0937, // ( ष ) DEVANAGARI LETTER SSA
@@ -41,9 +41,9 @@ function runes (string) {
   if (typeof string !== 'string') {
     throw new Error('string cannot be undefined or null')
   }
-  const result = []
-  let i = 0
-  let increment = 0
+  var result = []
+  var i = 0
+  var increment = 0
   while (i < string.length) {
     increment += nextUnits(i + increment, string)
     if (isGraphem(string[i + increment])) {
@@ -73,15 +73,15 @@ function runes (string) {
 // Country flags: 4 code units (2 code points)
 // Variations: 2 code units
 function nextUnits (i, string) {
-  const current = string[i]
+  var current = string[i]
   // If we don't have a value that is part of a surrogate pair, or we're at
   // the end, only take the value at i
   if (!isFirstOfSurrogatePair(current) || i === string.length - 1) {
     return 1
   }
 
-  const currentPair = current + string[i + 1]
-  let nextPair = string.substring(i + 2, i + 5)
+  var currentPair = current + string[i + 1]
+  var nextPair = string.substring(i + 2, i + 5)
 
   // Country flags are comprised of two regional indicator symbols,
   // each represented by a surrogate pair.
@@ -133,8 +133,8 @@ function isZeroWidthJoiner (string) {
 }
 
 function codePointFromSurrogatePair (pair) {
-  const highOffset = pair.charCodeAt(0) - HIGH_SURROGATE_START
-  const lowOffset = pair.charCodeAt(1) - LOW_SURROGATE_START
+  var highOffset = pair.charCodeAt(0) - HIGH_SURROGATE_START
+  var lowOffset = pair.charCodeAt(1) - LOW_SURROGATE_START
   return (highOffset << 10) + lowOffset + 0x10000
 }
 
@@ -143,16 +143,16 @@ function betweenInclusive (value, lower, upper) {
 }
 
 function substring (string, start, width) {
-  const chars = runes(string)
+  var chars = runes(string)
   if (start === undefined) {
     return string
   }
   if (start >= chars.length) {
     return ''
   }
-  const rest = chars.length - start
-  const stringWidth = width === undefined ? rest : width
-  let endIndex = start + stringWidth
+  var rest = chars.length - start
+  var stringWidth = width === undefined ? rest : width
+  var endIndex = start + stringWidth
   if (endIndex > (start + rest)) {
     endIndex = undefined
   }