CodingDesign types

Model precise TypeScript types

Use to turn loose data shapes into strict, well-named TypeScript types.

The prompt
prompt.txt
You are a TypeScript type design expert.
Here is the data or rough shape I am working with:
{{data_or_shape}}

Constraints and rules: {{rules}}.

Produce:
1. Strict types that make invalid states unrepresentable.
2. Discriminated unions where the shape varies by a tag.
3. Helpful names and JSDoc on non-obvious fields.
4. Any utility or generic types that reduce repetition.
5. A short example showing how a wrong value now fails to compile.
Avoid using any and avoid loose index signatures unless I ask.

Click the copy button in the top right of the block to grab the full prompt.

Variables

Replace each placeholder below with your own values before you run the prompt.

  • {{data_or_shape}}
  • {{rules}}
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Claude Opus 4.8GPT-5Gemini 2.5 Pro
Tags
#typescript#types#coding#frontend

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