fix: resolve cjs deps as cjs instead of esm

package.json

@@ -45,6 +45,7 @@
     "@types/graceful-fs": "^4.1.5",
     "@types/micromatch": "^4.0.1",
     "@types/node": "^14.14.37",
+    "@vercel/edge-config": "^0.4.0",
     "analytics-node": "^3.4.0-beta.1",
     "apollo-server-express": "^2.14.2",
     "argon2": "^0.27.2",

src/node-file-trace.ts

@@ -328,7 +328,7 @@ export class Job {
         else
           await this.emitFile(asset, 'asset', path);
       }),
-      ...[...deps].map(async dep => this.maybeEmitDep(dep, path, !isESM)),
+      ...[...deps].map(async dep => this.maybeEmitDep(dep, path, !isESM || this.mixedModules)),
       ...[...imports].map(async dep => this.maybeEmitDep(dep, path, false)),
     ]);
   }

test/integration/vercel-edge-config-esm.js

@@ -0,0 +1,5 @@
+// this will load the CJS export and should not be treated as ESM
+const ec = require('@vercel/edge-config');
+
+// this will cause the file to be treated as ESM
+export default function foo() {}