Writing a TypeScript Type Inference Engine in 300 Lines of Vanilla JS

It sounds like you've built an interesting tool for generating TypeScript interfaces from JSON samples! Your approach seems to focus on simplicity and ease-of-use, which can be very valuable in certain contexts where a lightweight solution is preferred over a more comprehensive but complex one.

Key Points of Your Tool

1. Simplicity: The core functionality is straightforward—parse JSON inputs, generate TypeScript interfaces, and provide runtime type checks. This makes it easy to understand and use.
2. Customizability: By focusing on generating basic types (primitives, arrays, objects), your tool can be easily extended or modified for specific needs without the overhead of a large codebase.
3. Live Preview: The live-updating output pane is a nice touch that provides immediate feedback to users as they input JSON samples.

Potential Improvements

1. Error Handling and Validation:

   • While you mentioned handling some edge cases, consider adding more robust error messages for invalid inputs (e.g., malformed JSON).
   • Validate the generated TypeScript code against a TypeScript compiler API to ensure it's syntactically correct before displaying it in the output pane.

2. Additional Features:

   • Support for optional fields and default values.

Read the full article at DEV Community

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