Understanding and Resolving the Vue Feature Flag Warning in Your Development Environment __VUE_PROD_HYDRATION_MISMATCH_DETAILS__ is not explicitly defined

Vue.js, like many modern JavaScript frameworks, employs feature flags to toggle certain development or production-only features. Recently, upon updating to Vue 3.4.4, you might encounter a console warning about an undefined feature flag, __VUE_PROD_HYDRATION_MISMATCH_DETAILS__. This flag plays a role in how Vue handles hydration mismatches, a common issue when the server-rendered markup doesn’t match the client-rendered markup.

Read more »