How to Fix TypeScript TS2589: "Type instantiation is excessively deep and possibly infinite"

Short summary

TypeScript's TS2589 error occurs when the compiler hits a safety limit on recursive type expansion—which can happen even with finite, valid types. Common causes include recursive conditional types, nested object path builders, and mapped types over deep structures. Fixes range from adding depth limits and fallback types to validating individual values instead of enumerating all valid options.

• •TS2589 occurs when TypeScript can't evaluate recursive types within compiler limits
• •Root causes: recursive conditionals, nested object builders, mapped types over deep objects
• •Solutions: add depth limits, use fallback types, or validate individual values instead of generating exhaustive unions

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