Courses / TypeScript
4. allowSyntheticDefaultImports
Flag that relaxes default import behavior for interop with CommonJS modules during migration.
JavaScript / TypeScript (module interop)
allowSyntheticDefaultImports
A compiler flag that lets you write default-style imports for modules that only export CommonJS exports.
"When I'm migrating old CommonJS code, I want to import default-style without rewriting every module."
allowSyntheticDefaultImports is a TypeScript/tsc/ESBuild/Babel-compatible flag that permits writing `import foo from "module"` even if the module uses CommonJS exports, by providing a synthetic default export at compile-time for ease of migration and interop.
"When I'm migrating old CommonJS code, I want to import default-style without rewriting every module."
allowSyntheticDefaultImports is a TypeScript/tsc/ESBuild/Babel-compatible flag that permits writing `import foo from "module"` even if the module uses CommonJS exports, by providing a synthetic default export at compile-time for ease of migration and interop.