New improvements to Firestore Security Rules

Firebase has introduced substantial improvements to Cloud Firestore and Cloud Storage Security Rules to make policies easier to write, read, debug, and scale. New Set support enables concise comparisons of document fields through operations such as checking required keys, intersections, differences, and membership, while new Map methods including diff() and get() simplify detecting changed fields and safely retrieving values with defaults. Functions can now use up to 10 local variables declared with let, allowing repeated access-control conditions and document paths to be organized into clearer reusable logic. A ternary operator also adds conditional if/else-style expressions for more compact authorization rules. In addition, the maximum compiled Rules file size has increased from 64 KB to 256 KB after performance optimizations, expanding capacity while preserving the low-latency decisions required by Security Rules.

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