more robust module parsing

Author: Daniel Del Core

.changeset/hot-starfishes-listen.md

@@ -0,0 +1,5 @@
+---
+'@codeshift/core': patch
+---
+
+Improves module parsing to account for different import schemes

packages/core/lib/Worker.js

@@ -57,6 +57,10 @@ function retrievePath(str) {
   return str.replace(/[@#][^@#]*$/, '');
 }
 
+function getModule(mod) {
+  return mod.hasOwnProperty('default') ? mod.default : mod;
+}
+
 function setup(entryPath, babel) {
   if (babel === 'babel') {
     const presets = [];
@@ -100,23 +104,20 @@ function setup(entryPath, babel) {
   let transformModule;
 
   if (transformId) {
-    transformPkg = require(retrievePath(entryPath));
+    transformPkg = getModule(require(path.resolve(retrievePath(entryPath))));
     transformModule = transformPkg.transforms[transformId];
   }
 
   if (presetId) {
-    transformPkg = require(retrievePath(entryPath));
+    transformPkg = getModule(require(path.resolve(retrievePath(entryPath))));
     transformModule = transformPkg.presets[presetId];
   }
 
   if (!transformId && !presetId) {
     transformModule = require(path.resolve(entryPath));
   }
 
-  transform =
-    typeof transformModule.default === 'function'
-      ? transformModule.default
-      : transformModule;
+  transform = getModule(transformModule);
 
   if (transformModule.parser) {
     parserFromTransform =

packages/core/src/runner.ts

@@ -166,11 +166,15 @@ export function run(entrypointPath: string, paths: string[], options: Flags) {
   ignores.add(options.ignorePattern);
   ignores.addFromFile(options.ignoreConfig);
 
-  if (!fs.existsSync(entrypointPath.replace(/[@#][^@#]*$/, ''))) {
+  const absoluteEntrypointPath = path.resolve(
+    entrypointPath.replace(/[@#][^@#]*$/, ''),
+  );
+
+  if (!fs.existsSync(absoluteEntrypointPath)) {
     process.stderr.write(
       chalk.white.bgRed('ERROR') +
         ' Transform file ' +
-        entrypointPath +
+        absoluteEntrypointPath +
         ' does not exist \n',
     );
     return;