The "Built with Reflex" badge appends a urlencoded ref query parameter to its reflex.dev link when the REFLEX_REFERRER_PARAM environment variable is set at compile time. (#6951)

Sanitize buffered upload filenames the same way streamed upload filenames are sanitized. (#6753)
rx.script head updates now flush synchronously instead of via react-helmet's requestAnimationFrame batching, fixing intermittently missing script tags after hydration (flaky "scripts not loaded" failures). (#6905)
Upload filenames whose segments contain nothing but dots and spaces (e.g. "..", "./../.", ".. ") now sanitize to the fallback name upload instead of returning the bare segment. Such names pointed the saved path outside the upload directory — directly on POSIX, and via Win32's trailing dot/space trimming on Windows — and crashed the upload handler with a 500. (#6971)

Hoist the RegistrationContext import in the upload handler to module level. (#6382)
Internal logging migrated from the legacy console helpers to standard python logging per-module loggers. (#6864)
Property docstrings are now noun phrases rather than "Get the ..." / "Return the ..." (ruff 0.16's new D421). (#6893)

v0.9.8 (2026-08-04)

v0.9.7 (2026-07-15)

rx.upload internals use ArrayVar.map instead of the deprecated foreach. (#6701)

Deliver extra bound handler arguments to upload handlers, so on_drop=State.handle_upload(rx.upload_files(...), field) passes field through to the backend instead of raising a missing-argument error. (#5290)
Preserve literal string types through rx.cond, so rx.cond(State.flag, "green", "red") infers Var[Literal["green", "red"]] instead of widening to Var[str] and tripping Pyright on props typed as Literal[...] | Var[Literal[...]] such as Radix color_scheme. (#6545)
rx.debounce_input no longer crashes the page with ReferenceError: input is not defined when wrapping a native DOM element such as rx.el.input or rx.el.textarea. The element prop now passes global-scope tags as string literals (element:"input"), while library components keep referencing their imported identifiers. (#6637)

Form now validates statically-knowable fields against a TypedDict-annotated on_submit handler at create time: it walks nested form controls (including components nested in props), collects their static name/id values, and raises EventHandlerValueError listing the missing and present fields when a required TypedDict field has no matching control. input, select, and textarea are marked as form controls so their identifiers are collected, and required-field resolution honors NotRequired across Python 3.10 and 3.11+. The on_submit handler signature also accepts a mapping-style payload via on_submit_mapping_event. (#6301)

The connection-error banner now subscribes only to the dedicated CONNECT_ERRORS hook instead of the shared events hook, and the upload component declares its UploadFilesProvider through VarData.app_wraps rather than Upload._get_app_wrap_components. (#6447)