What are Algebraic Data Types in TypeScript?

Unions of tagged objects, each variant with precise data. Compiler bans invalid combos.

How do ADTs in TypeScript prevent payment errors?

By making illegal states uncompilable—no optional fields, exhaustiveness checks catch misses.

Should I use ADTs for all state machines?

For money flows, yes. Elsewhere, weigh verbosity vs. safety.

TypeScript ADTs: The Compiler's Shield Against Payment Nightmares

A single typo in a payment status string just cost a startup $47,000 in duplicate charges. Algebraic Data Types in TypeScript make such disasters compiler-illegal, not just unlikely.

theAIcatchup Apr 10, 2026 3 min read

TypeScript union types modeling secure payment states

⚡ Key Takeaways

ADTs make invalid payment states compiler errors, slashing double-charge risks. 𝕏
Zero runtime cost with automatic narrowing and exhaustiveness checks. 𝕏
Fintechs adopting TS ADTs ship faster, build investor trust through reliability. 𝕏

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#ADTs #Algebraic Data Types #Payment Flows #TypeScript #type safety

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Originally reported by Dev.to

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