What this snippet does
Under isolatedModules, re-exporting a type without the 'type' modifier can cause runtime errors because transpilers can't distinguish types from values.
Expected output
Compile Error: 'Config' is a type and must be imported using a type-only import when 'isolatedModules' is enabled.
Why practise typing this
Typing modules & namespaces code builds muscle memory for the symbols and indentation TypeScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More TypeScript practice
- Exporting and importing a typed variableModules & Namespaces · intermediate
- Exporting an interface and implementationModules & Namespaces · intermediate
- Defining a default exportModules & Namespaces · intermediate
- Default exporting a class instanceModules & Namespaces · intermediate
- Mixing default and named imports incorrectlyModules & Namespaces · intermediate
- Defining a basic namespaceModules & Namespaces · intermediate