From 1edf1f8cc0f0885a4fab12980bc0d384b804bb59 Mon Sep 17 00:00:00 2001
From: Ludovico Fischer <livrerie@gmail.com>
Date: Sat, 8 May 2021 22:26:10 +0200
Subject: [PATCH] chore(postcss-zindex): refactor to drop depenencies

Replace uniqs and has with a map.
---
 packages/postcss-zindex/package.json          |  5 +--
 packages/postcss-zindex/src/index.js          |  2 +-
 packages/postcss-zindex/src/lib/layerCache.js | 33 +++++--------------
 packages/postcss-zindex/yarn.lock             | 17 ----------
 4 files changed, 10 insertions(+), 47 deletions(-)

diff --git a/packages/postcss-zindex/package.json b/packages/postcss-zindex/package.json
index 1476d39e5..a4c9a65ca 100644
--- a/packages/postcss-zindex/package.json
+++ b/packages/postcss-zindex/package.json
@@ -22,10 +22,7 @@
     "z-index"
   ],
   "license": "MIT",
-  "dependencies": {
-    "has": "^1.0.3",
-    "uniqs": "^2.0.0"
-  },
+  "dependencies": {},
   "homepage": "https://github.com/cssnano/cssnano",
   "author": {
     "name": "Ben Briggs",
diff --git a/packages/postcss-zindex/src/index.js b/packages/postcss-zindex/src/index.js
index 9c0bd04d7..965e6f2c1 100644
--- a/packages/postcss-zindex/src/index.js
+++ b/packages/postcss-zindex/src/index.js
@@ -29,7 +29,7 @@ function pluginCreator(opts = {}) {
             return;
           }
 
-          cache.optimizeValues();
+          cache.optimizeValues(opts.startIndex || 1);
 
           // Second pass; optimize
           nodes.forEach((decl) => {
diff --git a/packages/postcss-zindex/src/lib/layerCache.js b/packages/postcss-zindex/src/lib/layerCache.js
index 3268bcece..c1c45ad3a 100644
--- a/packages/postcss-zindex/src/lib/layerCache.js
+++ b/packages/postcss-zindex/src/lib/layerCache.js
@@ -1,33 +1,16 @@
-import has from 'has';
-import uniq from 'uniqs';
-
-function LayerCache(opts) {
-  this._values = [];
-  this._startIndex = opts.startIndex || 1;
+function LayerCache() {
+  this._values = new Map();
 }
 
 function ascending(a, b) {
   return a - b;
 }
 
-function reduceValues(list, value, index) {
-  list[value] = index + this._startIndex;
-
-  return list;
-}
-
-LayerCache.prototype._findValue = function (value) {
-  if (has(this._values, value)) {
-    return this._values[value];
+LayerCache.prototype.optimizeValues = function (startIndex) {
+  const sortedValues = Array.from(this._values.keys()).sort(ascending);
+  for (let i = 0; i < sortedValues.length; i++) {
+    this._values.set(sortedValues[i], i + startIndex);
   }
-
-  return false;
-};
-
-LayerCache.prototype.optimizeValues = function () {
-  this._values = uniq(this._values)
-    .sort(ascending)
-    .reduce(reduceValues.bind(this), {});
 };
 
 LayerCache.prototype.addValue = function (value) {
@@ -38,13 +21,13 @@ LayerCache.prototype.addValue = function (value) {
     return;
   }
 
-  this._values.push(parsedValue);
+  this._values.set(parsedValue, parsedValue);
 };
 
 LayerCache.prototype.getValue = function (value) {
   let parsedValue = parseInt(value, 10);
 
-  return this._findValue(parsedValue) || value;
+  return this._values.get(parsedValue) || value;
 };
 
 export default LayerCache;
diff --git a/packages/postcss-zindex/yarn.lock b/packages/postcss-zindex/yarn.lock
index 1525ba84f..360fc7ea6 100644
--- a/packages/postcss-zindex/yarn.lock
+++ b/packages/postcss-zindex/yarn.lock
@@ -7,18 +7,6 @@ colorette@^1.2.1:
   resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
   integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
 
-function-bind@^1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
-  integrity sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==
-
-has@^1.0.3:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/has/-/has-1.0.3.tgz#722d7cbfc1f6aa8241f16dd814e011e1f41e8796"
-  integrity sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==
-  dependencies:
-    function-bind "^1.1.1"
-
 nanoid@^3.1.20:
   version "3.1.20"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
@@ -37,8 +25,3 @@ source-map@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
-
-uniqs@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/uniqs/-/uniqs-2.0.0.tgz#ffede4b36b25290696e6e165d4a59edb998e6b02"
-  integrity sha1-/+3ks2slKQaW5uFl1KWe25mOawI=