fix bad require

src/lib/plugins/index.js

@@ -0,0 +1,28 @@
+module.exports.builtinPlugins = null
+
+const filterKeys = (keys) => {
+  if (process.platform === 'browser') keys = keys.filter(k => k !== './external.js')
+  keys = keys.filter(k => k !== './index.js' && k !== 'index.js')
+  return keys
+}
+
+module.exports.initPlugins = () => {
+  if (process.platform === 'browser') {
+    const isWebpack = !!require.context
+    if (isWebpack) {
+      const pluginsMap = require.context('./', false, /^(?!.*(?:external.js$)).*\.js$/)
+      module.exports.builtinPlugins = filterKeys(pluginsMap.keys()).map(k => pluginsMap(k))
+    } else {
+      // esbuild custom plugin
+      const files = require(/* webpackIgnore: true */ 'esbuild-import-glob(path:.,skipFiles:index.js,external.js)')
+      module.exports.builtinPlugins = Object.values(files)
+    }
+  } else {
+    // todo use browser field or bundle like valtio does: https://github.com/webpack/webpack/issues/8826#issuecomment-671402668
+    const requireIndex = require('../requireindex')
+    const path = require('path')
+
+    const _plugins = requireIndex(path.join(__dirname, './'))
+    module.exports.builtinPlugins = filterKeys(Object.keys(_plugins)).map(k => _plugins[k])
+  }
+}

src/lib/plugins/world.js

@@ -39,7 +39,7 @@ module.exports.server = async function (serv, { version, worldFolder, generation
   generation.options.version = version
   serv.emit('seed', generation.options.seed)
   // ignore
-  const generationModule = generations[generation.name] ? generations[generation.name] : global['require'](generation.name)
+  const generationModule = generations[generation.name] ? generations[generation.name] : require(generation.name)
   serv.overworld = new World(generationModule(generation.options), regionFolder === undefined ? null : new Anvil(regionFolder))
   serv.netherworld = new World(generations.nether(generation.options))
   // serv.endworld = new World(generations["end"]({}));