chore(core): fix plugin implementation upon testing

Author: bmuenzenmeyer

packages/core/src/lib/buildPatterns.js

@@ -14,7 +14,7 @@ const CompileState = require('./object_factory').CompileState;
 const processMetaPattern = require('./processMetaPattern');
 const pe = require('./pattern_exporter');
 const lh = require('./lineage_hunter');
-const pm = require('./lib/plugin_manager');
+const pm = require('./plugin_manager');
 const pluginMananger = new pm();
 const markModifiedPatterns = require('./markModifiedPatterns');
 const parseAllLinks = require('./parseAllLinks');

packages/core/src/lib/compose.js

@@ -8,7 +8,7 @@ const logger = require('./log');
 const parseLink = require('./parseLink');
 const render = require('./render');
 const uikitExcludePattern = require('./uikitExcludePattern');
-const pm = require('./lib/plugin_manager');
+const pm = require('./plugin_manager');
 const pluginMananger = new pm();
 
 const Pattern = require('./object_factory').Pattern;

packages/core/src/lib/plugin_manager.js

@@ -52,7 +52,9 @@ const plugin_manager = function() {
     patternlab.events.emit(eventName, args);
 
     await (async function() {
-      const hookHandlers = patternlab.hooks[eventName].map(h => h(args));
+      const hookHandlers = (patternlab.hooks[eventName] || []).map(h =>
+        h(args)
+      );
 
       const results = await Promise.all(hookHandlers);
     })();

packages/core/src/lib/watchPatternLabFiles.js

@@ -4,7 +4,7 @@ const path = require('path');
 
 const logger = require('./log');
 const events = require('./events');
-const pm = require('./lib/plugin_manager');
+const pm = require('./plugin_manager');
 const pluginMananger = new pm();
 
 let chokidar = require('chokidar'); // eslint-disable-line prefer-const