perf: ⚡️ create units object only once

README.md

@@ -57,6 +57,7 @@ __Motto of `nano-css` is simple__: *create the smallest possible CSS-in-JS libra
   - [`extract`](./docs/extract.md)
   - [`sourcemaps`](./docs/sourcemaps.md)
   - [`safe`](./docs/safe.md)
+  - [`units`](./docs/units.md)
 - [Presets](./docs/Presets.md)
 - [Server-side rendering](./docs/SSR.md)
 

addon/__tests__/units.dev.test.js

@@ -0,0 +1,5 @@
+'use strict';
+
+process.env.NODE_ENV = 'development';
+
+require('./units.test');

addon/__tests__/units.server.dev.test.js

@@ -0,0 +1,6 @@
+/** @jest-environment node */
+'use strict';
+
+process.env.NODE_ENV = 'development';
+
+require('./units.test');

addon/__tests__/units.server.test.js

@@ -0,0 +1,4 @@
+/** @jest-environment node */
+'use strict';
+
+require('./units.test');

addon/units.js

@@ -1,43 +1,43 @@
 'use strict';
 
-exports.addon = function (renderer) {
-    var units = {};
-    var list = [
-        'px',
-        'cm',
-        'mm',
-        'in',
-        'pt',
-        'pc',
-        'em',
-        'ex',
-        'ch',
-        'rem',
-        'vw',
-        'vh',
-        'deg',
-        'vmin',
-        'vmax',
-    ];
+var units = {};
+var list = [
+    'px',
+    'cm',
+    'mm',
+    'in',
+    'pt',
+    'pc',
+    'em',
+    'ex',
+    'ch',
+    'rem',
+    'vw',
+    'vh',
+    'deg',
+    'vmin',
+    'vmax',
+];
 
-    function f (unit, val) {
-        return val + unit;
-    }
+function f (unit, val) {
+    return val + unit;
+}
 
-    for (var i = 0; i < list.length; i++) {
-        var unit = list[i];
+for (var i = 0; i < list.length; i++) {
+    var unit = list[i];
 
-        units[unit] = f.bind(null, unit);
-    }
+    units[unit] = f.bind(null, unit);
+}
 
-    units.inch = function (val) {
-        return val + 'in';
-    };
+units.inch = function (val) {
+    return val + 'in';
+};
 
-    units.pct = function (val) {
-        return val + '%';
-    };
+units.pct = function (val) {
+    return val + '%';
+};
 
+exports.addon = function (renderer) {
     renderer.assign(renderer, units);
     renderer.units = units;
 };