feat: strip flow syntax with keep esm statements

- remove "imports" from sucrase transforms - strip typeof import statements manually
leegeunhyeok · Nov 16, 2023 · bec3b70 · bec3b70 · vercel · Nov 16, 2023
1 parent 4646fc3
commit bec3b70
Showing 1 changed file with 14 additions and 5 deletions.
diff --git a/packages/transformer/lib/transformer/sucrase/sucrase.ts b/packages/transformer/lib/transformer/sucrase/sucrase.ts
@@ -1,11 +1,20 @@
 import { transform, type Transform } from 'sucrase';
 import type { SyncTransformer } from '../../types';
 
-const TRANSFORM_FOR_STRIP_FLOW: Transform[] = ['flow', 'imports', 'jsx'];
+const TRANSFORM_FOR_STRIP_FLOW: Transform[] = ['flow', 'jsx'];
+
+const stripFlowTypeofImportStatements = (code: string): string => {
+  return code
+    .split('\n')
+    .filter((line) => !line.startsWith('import typeof '))
+    .join('\n');
+};
 
 export const stripFlowWithSucrase: SyncTransformer<void> = (code, context) => {
-  return transform(code, {
-    transforms: TRANSFORM_FOR_STRIP_FLOW,
-    filePath: context.path,
-  }).code;
+  return stripFlowTypeofImportStatements(
+    transform(code, {
+      transforms: TRANSFORM_FOR_STRIP_FLOW,
+      filePath: context.path,
+    }).code,
+  );
 };