feat: add extract addon

addon/extract.js

@@ -0,0 +1,61 @@
+'use strict';
+
+exports.addon = function (renderer) {
+    if (renderer.client) {
+        console.error(
+            'You are running nano-css "extract" addon in browser. ' +
+            'You should use it ONLY on server and ONLY at build time.'
+        );
+
+        return;
+    }
+
+    var sheet = renderer.sheet;
+
+    // eslint-disable-next-line no-unused-vars
+    var dummy;
+
+    // Evaluate all lazy-evaluated sheet() styles.
+    if (sheet) {
+        renderer.sheet = function (map) {
+            var styles = sheet.apply(this, arguments);
+
+            for (var name in map) dummy = styles[name];
+
+            return styles;
+        };
+    }
+
+    var jsx = renderer.jsx;
+
+    // Render jsx component once to extract its static CSS.
+    if (jsx) {
+        renderer.jsx = function () {
+            var jsxComponent = jsx.apply(this, arguments);
+
+            process.nextTick(function () {
+                jsxComponent(jsxComponent.defaultProps || {});
+            });
+
+            return jsxComponent;
+        };
+    }
+
+    var style = renderer.style;
+
+    // Render styled component once with default props
+    // to extract its static CSS and "default" dynamic CSS.
+    if (style) {
+        renderer.style = function (tag, css, dynamicTemplate) {
+            var styledComponent = style.apply(this, arguments);
+
+            if (typeof dynamicTemplate === 'function') {
+                process.nextTick(function () {
+                    styledComponent(styledComponent.defaultProps || {});
+                });
+            }
+
+            return styledComponent;
+        };
+    }
+};