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New Flow Errors on Unknown Property Access in Conditionals

website/blog/2018-03-16-New-Flow-Errors-on-Unknown-Property-Access-in-Conditionals.md

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:::info[Historical] This post announced errors on unknown property access in conditionals when it was introduced. For current syntax and behavior, see the Refinements documentation. :::

TL;DR: Starting in 0.68.0, Flow will now error when you access unknown properties in conditionals.