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type-only-imports

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Use when auditing import statements in TypeScript files, setting up a new TypeScript project, or investigating unexpected bundle inclusions from type-only dependencies.

skills/type-only-imports/SKILL.md

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# Use import type for type-only imports

Regular imports cause the JavaScript runtime to evaluate and execute the imported module even when only a TypeScript type from that module is used. This can increase bundle size, introduce unintended side effects, and create circular dependency issues that are otherwise avoidable. Using import type makes the erased-at-runtime nature of type imports explicit and enables bundlers and the TypeScript compiler to handle them optimally.

## Quick Reference

- import type is erased entirely at compile time — no runtime module evaluation
- Prevents accidentally importing a value when only a type is needed
- Reduces circular dependency issues caused by type-only relationships
- verbatimModuleSyntax in TypeScript 5 enforces this automatically

## Check

Review the import statements in this TypeScript file and identify any imports where only types or interfaces are used. These should use import type instead of a regular import.