[fix] StyleSheet registry key check

README.md

@@ -82,6 +82,7 @@ Exported modules:
   * [`Vibration`](docs/apis/Vibration.md)
 
 <span id="#why"></span>
+
 ## Why?
 
 There are many different teams at Twitter building web applications with React.

docs/guides/rendering.md

@@ -65,6 +65,10 @@ AppRegistry.runApplication('App', {
 })
 ```
 
+Setting `process.env.__REACT_NATIVE_DEBUG_ENABLED__` to `true` will expose some
+debugging logs. This can help track down when you're rendering without the
+performance benefit of cached styles.
+
 ## Server-side rendering
 
 Rendering using the `AppRegistry`:

src/apis/StyleSheet/registry.js

@@ -56,7 +56,7 @@ const registerStyle = (id, flatStyle) => {
     }
   }).join(' ').trim();
 
-  const key = `${prefix}${id}`;
+  const key = `${prefix}-${id}`;
   resolvedPropsCache[key] = { className };
 
   return id;
@@ -76,6 +76,7 @@ const resolveProps = (reactNativeStyle) => {
       if (injectedClassNames[singleClassName]) {
         return singleClassName;
       } else {
+        // 4x slower render
         style[prop] = value;
       }
     }
@@ -110,11 +111,14 @@ const resolveProps = (reactNativeStyle) => {
  * Caching layer over 'resolveProps'
  */
 const resolvePropsIfNeeded = (key, style) => {
-  if (!key || !resolvedPropsCache[key]) {
+  if (key) {
+    if (!resolvedPropsCache[key]) {
       // slow: convert style object to props and cache
       resolvedPropsCache[key] = resolveProps(style);
     }
     return resolvedPropsCache[key];
+  }
+  return resolveProps(style);
 };
 
 /**
@@ -123,6 +127,18 @@ const resolvePropsIfNeeded = (key, style) => {
 const StyleRegistry = {
   initialize(classNames) {
     injectedClassNames = classNames;
+
+    if (process.env.__REACT_NATIVE_DEBUG_ENABLED__) {
+      if (global.__REACT_NATIVE_DEBUG_ENABLED__styleRegistryTimer) {
+        clearInterval(global.__REACT_NATIVE_DEBUG_ENABLED__styleRegistryTimer);
+      }
+      global.__REACT_NATIVE_DEBUG_ENABLED__styleRegistryTimer = setInterval(() => {
+        const entryCount = Object.keys(resolvedPropsCache).length;
+        console.groupCollapsed('[StyleSheet] resolved props cache snapshot:', entryCount, 'entries');
+        console.log(resolvedPropsCache);
+        console.groupEnd();
+      }, 30000);
+    }
   },
 
   reset() {
@@ -155,6 +171,7 @@ const StyleRegistry = {
     // flatten the array
     // [ 1, [ 2, 3 ], { prop: value }, 4, 5 ] => [ 1, 2, 3, { prop: value }, 4, 5 ];
     const flatArray = flattenArray(reactNativeStyle);
+
     let isArrayOfNumbers = true;
     for (let i = 0; i < flatArray.length; i++) {
       if (typeof flatArray[i] !== 'number') {
@@ -163,14 +180,32 @@ const StyleRegistry = {
       }
     }
 
-    if (isArrayOfNumbers) {
+    // TODO: determine when/if to cache unregistered styles. This produces 2x
-      // cache resolved props
+    // faster benchmark results for unregistered styles. However, the cache
-      const key = `${prefix}${flatArray.join('-')}`;
+    // could be filled with props that are never used again.
+    //
+    // let hasValidKey = true;
+    // let key = flatArray.reduce((keyParts, element) => {
+    //   if (typeof element === 'number') {
+    //     keyParts.push(element);
+    //   } else {
+    //     if (element.transform) {
+    //       hasValidKey = false;
+    //     } else {
+    //       const objectAsKey = Object.keys(element).map((prop) => `${prop}:${element[prop]}`).join(';');
+    //       if (objectAsKey !== '') {
+    //         keyParts.push(objectAsKey);
+    //       }
+    //     }
+    //   }
+    //   return keyParts;
+    // }, [ prefix ]).join('-');
+    // if (!hasValidKey) { key = null; }
+
+    // cache resolved props when all styles are registered
+    const key = isArrayOfNumbers ? `${prefix}${flatArray.join('-')}` : null;
+
     return resolvePropsIfNeeded(key, flatArray);
-    } else {
-      // resolve
-      return resolveProps(flatArray);
-    }
   }
 };
 

src/components/Text/__tests__/__snapshots__/index-test.js.snap

@@ -1,15 +1,25 @@
 exports[`components/Text prop "children" 1`] = `
 <span
-  className="rn-borderTopWidth:0px rn-borderRightWidth:0px rn-borderBottomWidth:0px rn-borderLeftWidth:0px rn-color:inherit rn-display:inline rn-font:inherit rn-marginTop:0px rn-marginRight:0px rn-marginBottom:0px rn-marginLeft:0px rn-paddingTop:0px rn-paddingRight:0px rn-paddingBottom:0px rn-paddingLeft:0px rn-textDecoration:none rn-whiteSpace:pre-wrap rn-wordWrap:break-word"
+  className="
-  style={
+rn-borderTopWidth:0px
-    Array [
+rn-borderRightWidth:0px
-      3,
+rn-borderBottomWidth:0px
-      undefined,
+rn-borderLeftWidth:0px
-      false,
+rn-color:inherit
-      false,
+rn-display:inline
-      undefined,
+rn-font:inherit
-    ]
+rn-marginTop:0px
-  }>
+rn-marginRight:0px
+rn-marginBottom:0px
+rn-marginLeft:0px
+rn-paddingTop:0px
+rn-paddingRight:0px
+rn-paddingBottom:0px
+rn-paddingLeft:0px
+rn-textDecoration:none
+rn-whiteSpace:pre-wrap
+rn-wordWrap:break-word"
+  style={Object {}}>
   children
 </span>
 `;
@@ -44,16 +54,26 @@ rn-wordWrap:break-word"
 
 exports[`components/Text prop "selectable" 1`] = `
 <span
-  className="rn-borderTopWidth:0px rn-borderRightWidth:0px rn-borderBottomWidth:0px rn-borderLeftWidth:0px rn-color:inherit rn-display:inline rn-font:inherit rn-marginTop:0px rn-marginRight:0px rn-marginBottom:0px rn-marginLeft:0px rn-paddingTop:0px rn-paddingRight:0px rn-paddingBottom:0px rn-paddingLeft:0px rn-textDecoration:none rn-whiteSpace:pre-wrap rn-wordWrap:break-word"
+  className="
-  style={
+rn-borderTopWidth:0px
-    Array [
+rn-borderRightWidth:0px
-      3,
+rn-borderBottomWidth:0px
-      undefined,
+rn-borderLeftWidth:0px
-      false,
+rn-color:inherit
-      false,
+rn-display:inline
-      undefined,
+rn-font:inherit
-    ]
+rn-marginTop:0px
-  } />
+rn-marginRight:0px
+rn-marginBottom:0px
+rn-marginLeft:0px
+rn-paddingTop:0px
+rn-paddingRight:0px
+rn-paddingBottom:0px
+rn-paddingLeft:0px
+rn-textDecoration:none
+rn-whiteSpace:pre-wrap
+rn-wordWrap:break-word"
+  style={Object {}} />
 `;
 
 exports[`components/Text prop "selectable" 2`] = `

src/modules/ReactNativePropRegistry/index.js

@@ -17,11 +17,11 @@ const objects = {};
 const prefix = 'r';
 let uniqueID = 1;
 
-const createKey = (id) => `${prefix}${id}`;
+const createKey = (id) => `${prefix}-${id}`;
 
 class ReactNativePropRegistry {
   static register(object: Object): number {
-    let id = ++uniqueID;
+    let id = uniqueID++;
     if (process.env.NODE_ENV !== 'production') {
       Object.freeze(object);
     }