fix: add missing npm dependency. Allow dynamic imports (#461)

## Details
- Adding `camelcase` npm package
- Allowing dynamic imports syntax (follow up with lint rule)

## Does this PR introduce a breaking change?
* [x] No

packages/lwc-compiler/src/babel-plugins.ts

@@ -37,11 +37,10 @@ import * as transformPublicFields from '@babel/plugin-proposal-class-properties'
 import * as transformObjectRestSpread from '@babel/plugin-proposal-object-rest-spread';
 
 // Base babel configuration
-// TODO: Need to remove * on the parserOpts plugin - not advised by babel-core
 export const BABEL_CONFIG_BASE = {
     babelrc: false,
     sourceMaps: true,
-    parserOpts: { plugins: ['*'] },
+    parserOpts: { plugins: ['dynamicImport', 'decorators'] },
     presets: [],
 };
 

packages/lwc-compiler/src/transformers/__tests__/transform.spec.ts

@@ -113,6 +113,24 @@ describe('Javascript transform', () => {
             );
         }
     });
+
+    it('allows dynamic imports', async () => {
+        const actual = `
+            export function test() {
+                return import('/test');
+            }
+        `;
+
+        const expected = `
+            export function test() {
+                return import('/test');
+            }
+        `;
+
+        const { code } = await transform(actual, 'foo.js', { namespace: 'x', name: 'foo' });
+        expect(pretify(code)).toBe(pretify(expected));
+
+    });
 });
 
 describe('HTML transform', () => {

packages/lwc-template-compiler/package.json

@@ -27,6 +27,7 @@
     "babel-types": "^6.26.0",
     "babylon": "^6.17.0",
     "decamelize": "^1.2.0",
+    "camelcase": "~5.0.0",
     "he": "^1.1.1",
     "parse5-with-errors": "^4.0.1"
   }

yarn.lock

@@ -2627,6 +2627,10 @@ camelcase@^4.1.0:
   version "4.1.0"
   resolved "http://npm.lwcjs.org/camelcase/-/camelcase-4.1.0/d545635be1e33c542649c69173e5de6acfae34dd.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
 
+camelcase@~5.0.0:
+  version "5.0.0"
+  resolved "http://npm.lwcjs.org/camelcase/-/camelcase-5.0.0/03295527d58bd3cd4aa75363f35b2e8d97be2f42.tgz#03295527d58bd3cd4aa75363f35b2e8d97be2f42"
+
 caniuse-api@^1.5.2:
   version "1.6.1"
   resolved "http://npm.lwcjs.org/caniuse-api/-/caniuse-api-1.6.1/b534e7c734c4f81ec5fbe8aca2ad24354b962c6c.tgz#b534e7c734c4f81ec5fbe8aca2ad24354b962c6c"