JS Interop in Blazor 1. Collocated JS Modules Always use collocated files with — never global functions or tags. Import paths: same project = , RCL = . 2. Lifecycle Timing All JS interop must happen in or event handlers — never in , , or constructors. JS is not available during server prerendering. Use a typed interop wrapper (see Section 4) — never call / with raw string literals: Parameter changes : set a flag in , apply in : 3. Batch Related Operations Each JS interop call crosses the .NET-to-JS boundary (and in Blazor Server, the SignalR circuit). Batching applies in both directions — .NE…