From afbf6423de0098142feec25c189334d8d0a2c80f Mon Sep 17 00:00:00 2001
From: ehmicky <ehmicky@gmail.com>
Date: Wed, 24 Mar 2021 16:31:27 +0100
Subject: [PATCH 1/2] feat: improve performance of main function

---
 index.js | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

diff --git a/index.js b/index.js
index 0a9899b..9adc29c 100644
--- a/index.js
+++ b/index.js
@@ -135,22 +135,32 @@ if (platform === 'linux') {
 // TODO: Use https://github.com/sindresorhus/is-unicode-supported when targeting Node.js 10.
 const figures = platform === 'win32' ? fallback : main;
 
-const fn = string => {
-	if (figures === main) {
-		return string;
+const isFallbackFigure = ([key, mainValue]) => figures[key] !== mainValue;
+const getFigureRegExp = ([key, mainValue]) => [figures[key], new RegExp(escapeStringRegexp(mainValue), 'g')];
+
+let replacements = [];
+const getReplacements = () => {
+	if (replacements.length !== 0) {
+		return replacements;
 	}
 
-	for (const [key, value] of Object.entries(main)) {
-		if (value === figures[key]) {
-			continue;
-		}
+	replacements = Object.entries(main)
+		.filter(isFallbackFigure)
+		.map(getFigureRegExp);
+	return replacements;
+};
 
-		string = string.replace(new RegExp(escapeStringRegexp(value), 'g'), figures[key]);
+const replaceCharToFallback = (string, [fallbackValue, mainRegExp]) => string.replace(mainRegExp, fallbackValue);
+
+// On Windows, substitute non-fallback to fallback figures
+const replaceCharsToFallback = string => {
+	if (figures === main) {
+		return string;
 	}
 
-	return string;
+	return getReplacements().reduce(replaceCharToFallback, string);
 };
 
-module.exports = Object.assign(fn, figures);
+module.exports = Object.assign(replaceCharsToFallback, figures);
 module.exports.main = main;
 module.exports.windows = fallback;

From 87de1e79df0131ffd308c9607919a5d4f35f51da Mon Sep 17 00:00:00 2001
From: ehmicky <ehmicky@gmail.com>
Date: Wed, 24 Mar 2021 18:48:51 +0100
Subject: [PATCH 2/2] chore: do not use `Array.reduce()`

---
 index.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/index.js b/index.js
index 9adc29c..c06a11d 100644
--- a/index.js
+++ b/index.js
@@ -136,7 +136,7 @@ if (platform === 'linux') {
 const figures = platform === 'win32' ? fallback : main;
 
 const isFallbackFigure = ([key, mainValue]) => figures[key] !== mainValue;
-const getFigureRegExp = ([key, mainValue]) => [figures[key], new RegExp(escapeStringRegexp(mainValue), 'g')];
+const getFigureRegExp = ([key, mainValue]) => [new RegExp(escapeStringRegexp(mainValue), 'g'), figures[key]];
 
 let replacements = [];
 const getReplacements = () => {
@@ -150,15 +150,17 @@ const getReplacements = () => {
 	return replacements;
 };
 
-const replaceCharToFallback = (string, [fallbackValue, mainRegExp]) => string.replace(mainRegExp, fallbackValue);
-
 // On Windows, substitute non-fallback to fallback figures
 const replaceCharsToFallback = string => {
 	if (figures === main) {
 		return string;
 	}
 
-	return getReplacements().reduce(replaceCharToFallback, string);
+	for (const [mainRegExp, fallbackValue] of getReplacements()) {
+		string = string.replace(mainRegExp, fallbackValue);
+	}
+
+	return string;
 };
 
 module.exports = Object.assign(replaceCharsToFallback, figures);