Nathan Nguyen d558923fde fix(script): dedupe concurrent same-src loads (#1263) ...

* fix(script): dedupe concurrent same-src loads

Multiple next/script components with the same src could append duplicate DOM scripts when they mounted before the first script load event fired. That double-executed third-party code and diverged from Next.js' in-flight script cache behavior.

The shim now tracks remote scripts that are currently loading separately from scripts that have completed loading, and fans out load/error callbacks without adding another script element.

Adds a Pages Router browser regression that verifies simultaneous same-src scripts produce one DOM script and one execution.

* fix: address review feedback for script load dedupe

- Defer loadedScripts.add(key) to after in-flight promise resolves
- Add onReady() callback for duplicate callers joining in-flight load
- Clean up loadingScripts entry on promise settlement to allow retry

2026-05-16 20:16:38 +01:00

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dedupe-script.js

fix(script): dedupe concurrent same-src loads (#1263)

2026-05-16 20:16:38 +01:00