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XState v5 migration breaks v4 code with subtle context update issue

By PulseAugur Editorial · [1 sources] ·

XState v5, released in December 2023, introduced a subtle breaking change in its migration guide where implementation functions now expect a single object argument containing context, event, and other properties. Code written in the older v4 style may not throw an error but will produce incorrect results, such as NaN for context updates, because `context.cycles` becomes undefined. A tested recipe for a traffic light model using XState v5.33.2 is available, demonstrating the correct v5 syntax for actions. AI

RANK_REASON The item discusses a specific issue with a software library version and provides a practical example/recipe, fitting the 'tool' category.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

XState v5 migration breaks v4 code with subtle context update issue

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  1. dev.to — MCP tag TIER_1 (SL) · ProvenPin ·

    XState v4 code on v5: no error, just NaN

    <p>XState v5 shipped in December 2023, and its <a href="https://stately.ai/docs/migration" rel="noopener noreferrer">migration guide</a> lists a breaking change that is easy to miss: implementation functions now take a single object argument with <code>context</code>, <code>event…

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