remove module package file from cjs builds

Author: dlarocque

packages/functions-compat/rollup.config.js

@@ -68,7 +68,7 @@ const builds = [
       format: 'cjs',
       sourcemap: true
     },
-    plugins: [...es2017BuildPlugins, emitModulePackageFile()],
+    plugins: [...es2017BuildPlugins],
     external: id => deps.some(dep => id === dep || id.startsWith(`${dep}/`))
   }
 ];

packages/functions/rollup.config.js

@@ -81,7 +81,6 @@ const builds = [
     plugins: [
       ...es2017BuildPlugins,
       replace(generateBuildTargetReplaceConfig('cjs', 2017)),
-      emitModulePackageFile()
     ]
   }
 ];