What this snippet does
The 'declare global' syntax inside a module file allows adding variables or types to the global namespace.
Expected output
true
Why practise typing this
Typing global scope 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
- Adding a custom Error constructor globallyGlobal Scope · advanced
- Using declare global outside a moduleGlobal Scope · advanced
- Declaring variables with primitive typesBasic Types · beginner
- Typing function parameters with primitivesBasic Types · beginner
- Assigning a string to a number variableBasic Types · beginner
- Defining an array of numbersBasic Types · beginner