chore: tweak babel config

babel.config.js

@@ -46,8 +46,8 @@ module.exports = {
       '@babel/preset-env',
       {
         bugfixes: true,
-        // a runtime error is preferable, and we need a real `import`
-        exclude: ['@babel/plugin-proposal-dynamic-import'],
+        // we manually include the CJS plugin above, so let's make preset-env do less work
+        modules: false,
         shippedProposals: true,
         targets: {node: supportedNodeVersion},
       },

scripts/build.js

@@ -116,8 +116,8 @@ function buildFile(file, silent) {
             plugin[0],
             Object.assign({}, plugin[1], {
               lazy: string =>
-                // we want to lazyload all non-local modules plus `importEsm` - the latter to avoid syntax errors. Set to just `true` when we drop support for node 8
-                !string.startsWith('./') || string === './importEsm',
+                // we want to lazyload all non-local modules - this is buggy though as it doesn't pick up `../` etc. We should consider just `: true` which works correctly or even () => true which would also transform any local imports
+                !string.startsWith('./'),
             }),
           ];
         }