feat(events): add PATTERNLAB_BUILD_END event and rename BUILD_START

Emitting PATTERNLAB_BUILD_END allows us to remove reliance on reloading liveServer on PATTERNLAB_PATTERN_CHANGE - which is too early

Author: bmuenzenmeyer

packages/core/src/index.js

@@ -132,6 +132,9 @@ const patternlab_module = function(config) {
                     return Promise.resolve();
                   });
                 }
+              })
+              .then(() => {
+                this.events.emit(events.PATTERNLAB_BUILD_END);
               });
           });
         }

packages/core/src/lib/buildPatterns.js

@@ -25,7 +25,7 @@ let pattern_exporter = new pe(); // eslint-disable-line
 const lineage_hunter = new lh();
 
 module.exports = (deletePatternDir, patternlab, additionalData) => {
-  patternlab.events.emit(events.PATTERNLAB_BUILD_PATTERN_START, patternlab);
+  patternlab.events.emit(events.PATTERNLAB_BUILD_START, patternlab);
 
   const paths = patternlab.config.paths;
 

packages/core/src/lib/events.js

@@ -14,7 +14,14 @@ const EVENTS = Object.freeze({
    * @property {object} patternlab - global data store
    *
    */
-  PATTERNLAB_BUILD_PATTERN_START: 'patternlab-build-pattern-start',
+  PATTERNLAB_BUILD_START: 'patternlab-build-start',
+
+  /**
+   * @desc Emitted after all logic run inside `build()`, which is the entry point for single builds, pattern-only builds, run singly or when watched.
+   * @property {object} patternlab - global data store
+   *
+   */
+  PATTERNLAB_BUILD_END: 'patternlab-build-end',
 
   /**
    * @desc Emitted after patterns are iterated over to gather data about them. Right before Pattern Lab processes and renders patterns into HTML

packages/core/src/lib/server.js

@@ -45,15 +45,8 @@ const server = patternlab => {
         );
 
         const setupEventWatchers = () => {
-          // watch for asset changes, and reload appropriately
-          patternlab.events.on(events.PATTERNLAB_PATTERN_ASSET_CHANGE, data => {
-            if (serverReady) {
-              _module.reload(data);
-            }
-          });
-
-          //watch for pattern changes, and reload
-          patternlab.events.on(events.PATTERNLAB_PATTERN_CHANGE, () => {
+          //watch for builds to complete
+          patternlab.events.on(events.PATTERNLAB_BUILD_END, () => {
             if (serverReady) {
               _module.reload({
                 file: '',