Skip redundant reparsing when translating Flow defs to TS defs (facebook#49840)

Summary:
Pull Request resolved: facebook#49840

Changelog: [Internal]

Reviewed By: huntie

Differential Revision: D70620551

fbshipit-source-id: d526c1de733f19ab6106ae586632709fd1a389dc

Author: iwoplaza

scripts/build/build-types/translateSourceFile.js

@@ -65,7 +65,7 @@ async function translateSourceFile(
   );
 
   // Translate to TypeScript defs
-  const tsDefResult = await translate.translateFlowToTSDef(
+  const tsDefResult = await translate.translateFlowDefToTSDef(
     flowDefResult,
     prettierOptions,
   );