React 19 narrowed the callback-ref signature to (instance) => void |
(() => void), where a returned non-void value is treated as a cleanup
function. Several _takeXxxRef handlers were written as
`(el) => (this._el = el)`, which implicitly returns the assigned value
and no longer satisfies the new type. They now use block bodies so
they return undefined.
@types/react v19 also changed React.createRef<T>() to return
RefObject<T | null> instead of the legacy split between RefObject and
MutableRefObject. MaybeFlameGraph's _flameGraph field declares the new
shape directly so the assignment continues to typecheck.
React 19 appends "(<anonymous>)" to component-stack frames whose
component lacks a source location, so the ErrorBoundary regex now
allows that suffix on the NonLocalizedErrorBoundary frame. React 19
also follows the HTML spec for boolean attributes on custom elements
(prop={false} drops the attribute entirely); the Home tests mock
ListOfPublishedProfiles as a custom-element string, so the affected
snapshots no longer carry withactionbuttons="false".
Closes firefox-devtools#5590
Merged
canova added a commit that referenced this pull request
Jun 16, 2026
Changes: [Nazım Can Altınova] Fix call node context menu being hidden behind source view bottom box (#6045) [Nazım Can Altınova] Pass `--use-env-proxy` only when the node version is >= 24 (#6064) [fatadel] Upgrade @firefox-devtools/react-contextmenu to 5.2.4 (#6066) [Markus Stange] Switch profiler-edit from minimist to commander (#6065) [Markus Stange] Support reading profiles from JsonSlabs files (#6037) [Florian Quèze] Don't fail profile processing when a marker's stack field is not a backtrace (#6069) [fatadel] Replace the footer-links overlay with a settings menu (#6042) [fatadel] Upgrade @types/node to match Node 24 (#6070) [fatadel] Remove unused undici-types package (#6074) [cathaysia] Update isLocalURL to include LAN addresses, .local domains, and hostn… (#5973) [Markus Stange] Fix from-url with binary profiles (#6072) [fatadel] Upgrade to React 19 (#6067) [Markus Stange] Add an insertStackLabels helper. (#6076) [fatadel] Drive counter tooltips from a tooltipRows schema (#6023) [fatadel] Add TrackPower--tooltip-average-power-microwatt (#6080) [Markus Stange] Downgrade to React 19.1 to fix unusable dev build performance. (#6082) [Nazım Can Altınova] Add source map symbolication and source view support (#6018) [spokodev] fix(FilterNavigatorBar): clip overflow so many breadcrumbs do not expand the parent (#6085) [Markus Stange] Move paddings inside the tree header cells. (#6002) [Markus Stange] Add an --insert-label-frames argument to the profiler-edit tool (#5966) [Markus Stange] Stop printing "error: too many arguments" during tests. (#6088) [Markus Stange] More additions to profiler-edit, for sp3 profiles (#6009) [Nazım Can Altınova] Do not rely on localized texts in the settings menu tests (#6101) And special thanks to our localizers: be: Andrei Mukamolau de: Ger de: Michael Köhler de: Ralf Duehnfahr el: Jim Spentzos en-CA: chutten en-GB: Ian Neal es-CL: ravmn fr: Théo Chevalier fr: wy fur: Fabio Tomat fy-NL: Fjoerfoks ia: Melo46 it: Francesco Lodolo [:flod] nl: Mark Heijl ru: Valery Ledovskoy sr: Марко Костић (Marko Kostić) sv-SE: Andreas Pettersson tr: Grk tr: Selim Şumlu zh-CN: Olvcpr423 zh-TW: Pin-guang Chen