added rollup-plugin-analyzer to retrieve useful information when building

package-lock.json

@@ -640,6 +640,12 @@
 				"acorn": "^7.1.0"
 			}
 		},
+		"rollup-plugin-analyzer": {
+			"version": "3.2.3",
+			"resolved": "https://registry.npmjs.org/rollup-plugin-analyzer/-/rollup-plugin-analyzer-3.2.3.tgz",
+			"integrity": "sha512-Oq5GtofTCIGhW4mDNtnxH106gvPKQcdAKTLujWekAiLiTmstXX9Fmye7uMG7NaZVBHgKPPsIWCtPj04ci/YXmg==",
+			"dev": true
+		},
 		"rollup-plugin-terser": {
 			"version": "5.3.0",
 			"resolved": "https://registry.npmjs.org/rollup-plugin-terser/-/rollup-plugin-terser-5.3.0.tgz",

package.json

@@ -26,6 +26,7 @@
 		"@rollup/plugin-replace": "^2.3.2",
 		"npm-run-all": "^4.1.5",
 		"rollup": "^1.27.0",
+		"rollup-plugin-analyzer": "^3.2.3",
 		"rollup-plugin-terser": "^5.0.0"
 	}
 }

rollup.config.js

@@ -1,8 +1,9 @@
 import resolve from '@rollup/plugin-node-resolve'
+import { terser } from 'rollup-plugin-terser'
 import commonjs from '@rollup/plugin-commonjs'
 import replace from '@rollup/plugin-replace'
 import alias from '@rollup/plugin-alias'
-import { terser } from 'rollup-plugin-terser'
+import analyze from 'rollup-plugin-analyzer'
 
 // 'rollup -c' -> 'production' is false
 // 'rollup -c -w' -> 'production' is true
@@ -32,6 +33,7 @@ export default {
 		}),
 		resolve(), // Tells Rollup how to find imported modules in node_modules
 		commonjs(), // Converts imported modules to ES modules, if necessary
-		production && terser() // Minify, but only in production
+		production && terser(), // Minify, but only in production
+		production && analyze({ showExports: true }) // Show useful information about bundles, only in production
 	]
 }