fix: Include source url for parsing failures (#109)

Author: timfish

lib/get-exports.js

@@ -92,23 +92,29 @@ async function getExports (url, context, parentLoad) {
     source = readFileSync(fileURLToPath(url), 'utf8')
   }
 
-  if (format === 'module') {
-    return getEsmExports(source)
-  }
+  try {
+    if (format === 'module') {
+      return getEsmExports(source)
+    }
 
-  if (format === 'commonjs') {
-    return getCjsExports(url, context, parentLoad, source)
-  }
+    if (format === 'commonjs') {
+      return await getCjsExports(url, context, parentLoad, source)
+    }
 
-  // At this point our `format` is either undefined or not known by us. Fall
-  // back to parsing as ESM/CJS.
-  const esmExports = getEsmExports(source)
-  if (!esmExports.length) {
-    // TODO(bengl) it's might be possible to get here if somehow the format
-    // isn't set at first and yet we have an ESM module with no exports.
-    // I couldn't construct an example that would do this, so maybe it's
-    // impossible?
-    return getCjsExports(url, context, parentLoad, source)
+    // At this point our `format` is either undefined or not known by us. Fall
+    // back to parsing as ESM/CJS.
+    const esmExports = getEsmExports(source)
+    if (!esmExports.length) {
+      // TODO(bengl) it's might be possible to get here if somehow the format
+      // isn't set at first and yet we have an ESM module with no exports.
+      // I couldn't construct an example that would do this, so maybe it's
+      // impossible?
+      return await getCjsExports(url, context, parentLoad, source)
+    }
+  } catch (cause) {
+    const err = new Error(`Failed to parse '${url}'`)
+    err.cause = cause
+    throw err
   }
 }