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Use ephemeral port for esbuild's internal dev server - #5974
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Pass `port: 0` to `buildContext.serve` so esbuild binds an OS-assigned ephemeral port instead of grabbing 8000, which is commonly used by other local projects. The public port (4242 by default) is unaffected. Fixesfirefox-devtools#5881
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@## main #5974 +/- ##
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- Coverage 85.33% 85.25% -0.09%
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Files 323 317 -6 Lines 32262 31935 -327 Branches 8895 8753 -142 ==========================================
- Hits 27532 27226 -306 + Misses 4298 4277 -21
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canova
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Apr 28, 2026
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Looks like an okay workaround to me. I'm not a big fan of having two servers essentially, but it looks like esbuild doesn't support having a middleware and/or ability to update/check the headers.
fatadel
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Apr 28, 2026
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Yeah I did some exploration too and it seems like too much overhead for that. |
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Changes: [Nazım Can Altınova] Add Adel to the automatic dependency reviews (#5930) [fatadel] Fix arrow panel appearing behind marker tooltips (#5926) [fatadel] Upgrade Node.js from v22 to v24 (#5923) [Markus Stange] Use createStackTableBySkippingDiscarded in focusSelf. (#5916) [Markus Stange] Propagate isJS to symbolicated funcs (#5907) [Markus Stange] Always render the CPU-usage-aware activity graph when CPU information is available (#5918) [Nazım Can Altınova] Fallback to javascript highlighting in the source view as a backup (#5936) [Nazım Can Altınova] Properly type the return value of _languageExtForPath (#5937) [Nazım Can Altınova] Update typescript eslint dependencies (#5938) [Markus Stange] Modernize more of the transform functions (#5934) [Paul Adenot] Fix extractGeckoLogs for structured Log marker format (bug 2022540) (#5927) [Nazım Can Altınova] Move some profile fetching code into a separate module. (#5939) [Markus Stange] Update the hovered item when panning any viewport canvas (#5903) [Markus Stange] Migrate Home page animation to CSS transitions and remove react-transition-group (#5649) [Nazım Can Altınova] Fix test/lint commands on Windows and fix CI (#5947) [Nazım Can Altınova] Convert profile-logic/js-tracer.tsx to a ts file (#5942) [Markus Stange] Remove panelLayoutGeneration (#5946) [fatadel] Add CounterDisplayConfig to counters in the processed profile format (#5912) [Nazım Can Altınova] Fix eslint-config-prettier silently overriding custom rules (#5955) [fatadel] Dim non-matching nodes in the stack chart when searching (#5935) [Nazım Can Altınova] Fix loading .json.gz profiles from inside zip archives (#5959) [Ryan Hunt] Add a fullscreen button to the bottom box (#5605) [Markus Stange] Speed up _computeCallNodeTableHierarchy by keeping siblings ordered by func (#5964) [Markus Stange] Replace symbolicator-cli with a profiler-edit node tool (#5965) [Nazım Can Altınova] Add "Include idle samples" toggle to the call tree settings (#5968) [Nazım Can Altınova] Add dark mode versions of the fullscreen icons (#5972) [fatadel] Replace 4 counter track components with a single generic TrackCounter (#5944) [fatadel] Use ephemeral port for esbuild's internal dev server (#5974) [carverdamien] Remove category from LongTaskMarkerPayload (#5975) And special thanks to our localizers: de: Ger de: Michael Köhler el: Jim Spentzos en-GB: Ian Neal es-CL: ravmn fr: Théo Chevalier ia: Melo46 it: Francesco Lodolo [:flod] nl: Mark Heijl pt-BR: Marcelo Ghelman ru: Valery Ledovskoy ru: berry sv-SE: Andreas Pettersson tr: Grk zh-CN: Olvcpr423 zh-CN: wxie zh-TW: Pin-guang Chen
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Pass
port: 0tobuildContext.serveso esbuild binds an OS-assigned ephemeral port instead of grabbing 8000, which is commonly used by other local projects. The public port (4242 by default) is unaffected.Fixes#5881