Merge pull request #3353 from projectblacklight/upgrade-rollup

Upgrade rollup to v4

Author: jcoyne

package.json

@@ -3,6 +3,7 @@
   "version": "9.0.0-alpha",
   "description": "The frontend code and styles for Blacklight",
   "main": "app/assets/javascripts/blacklight",
+  "type": "module",
   "module": "app/assets/javascripts/blacklight/blacklight.esm.js",
   "scripts": {
     "prepare": "rollup --config rollup.config.js --sourcemap && ESM=true rollup --config rollup.config.js --sourcemap"
@@ -22,7 +23,7 @@
   },
   "homepage": "https://github.com/projectblacklight/blacklight#readme",
   "devDependencies": {
-    "rollup": "^2.60.0",
+    "rollup": "^4.24.0",
     "rollup-plugin-includepaths": "^0.2.4"
   },
   "browserslist": [

rollup.config.js

@@ -1,8 +1,5 @@
-'use strict'
-
 import includePaths from 'rollup-plugin-includepaths';
 
-const path = require('path')
 
 const BUNDLE = process.env.BUNDLE === 'true'
 const ESM = process.env.ESM === 'true'
@@ -19,19 +16,16 @@ let includePathOptions = {
 };
 
 const rollupConfig = {
-  input: path.resolve(__dirname, `app/javascript/blacklight/index.js`),
+  input: 'app/javascript/blacklight/index.js',
   output: {
-    file: path.resolve(__dirname, `app/assets/javascripts/blacklight/${fileDest}.js`),
-    format: ESM ? 'esm' : 'umd',
+    file: `app/assets/javascripts/blacklight/${fileDest}.js`,
+    format: ESM ? 'es' : 'umd',
     globals,
-    generatedCode: 'es2015'
+    generatedCode: { preset: 'es2015' },
+    name: ESM ? undefined : 'Blacklight'
   },
   external,
   plugins: [includePaths(includePathOptions)]
 }
 
-if (!ESM) {
-  rollupConfig.output.name = 'Blacklight'
-}
-
-module.exports = rollupConfig
+export default rollupConfig