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Owl 3.0 is a major new version of the Owl framework with significant changes to the reactivity system and application architecture. Main changes: - New reactivity system based on signals, computed values, and effects, replacing the proxy-based system. This provides a simpler, more explicit, and more composable model for reactive state management. - Plugin system replacing the `env` object, offering a more structured and type-safe way to share state and features across components. - Reworked props system with better typing support and validation. - Simplified rendering context: all variables are local by default, and component properties must be accessed through `this.`. - Various API improvements: new reference system using signals, simplified t-model with signal support, registries and resources integrated with reactivity. Motivation: Owl 2 served well but encountered "soft limits" as the codebase grew: subtle reactivity bugs, limited typing support, difficulty writing performant code with computed values, and lack of architectural guidance. Owl 3.x addresses these challenges with computed functions for declarative state coordination, plugins for composable architecture, and signals for simpler reactivity. Co-authored-by: Julien Mougenot <jum@odoo.com> Co-authored-by: Lucas Lefèvre <lul@odoo.com> Co-authored-by: Michaël Mattiello <mcm@odoo.com> Co-authored-by: Nicolas Bayet <nicolas.bayet@gmail.com>
Updated the playground application to work with Owl 3. All examples have been rewritten to use the new signal-based reactivity system, the plugin system, and the updated template syntax with `this.` for component property access.
mcm-odoo
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Mar 30, 2026
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