Quiz · 3 questions
🧩 Modules — Code Organization
ESM, import type, .d.ts, ambient modules, namespaces (legacy)
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Quiz
01What's the difference between
import type and a regular import?Hint
Look at the JavaScript output of a file that imports a type. With
import type, the import line is missing entirely.02What goes in a
.d.ts file?Hint
Open
node_modules/typescript/lib/lib.es5.d.ts — every type in the standard library lives here as a declaration.03Why did ES modules win over
namespace?Hint
Try to tree-shake a namespace — you can't. The whole namespace ships as one object. ESM imports can be analyzed and pruned individually.
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