Supporting two major versions of a dependency is not automatically the right choice. The harder question is whether that compatibility promise prevents a correct fix—and whether you can give existing users a clear, maintained path on the older version.
That trade-off became concrete for Nasrul Hazim, maintainer of laravel-scheduler-manager. In an account published August 27, 2026, he describes moving the package’s main line from Livewire 3 to Livewire 4 after finding that the shared code path blocked a safe fix involving Flux Blade components. His experience is a useful case study, not a universal rule: dropping an old major is justified only when the fix, verification burden, and migration path support that decision.
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What made the Livewire 3 and 4 boundary a problem?
The package had been pinned to livewire/livewire ^3.7, and its README said Livewire 4 was unsupported because of two reported failures. Hazim revisited those failures and concluded that one was real while the other came from stale compiled Blade views. The fixes exposed a deeper issue: code that worked across both majors was not necessarily correct for both.
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Hazim reports that registering aliases individually with Livewire::component($alias, $class) worked in Livewire 3 but did not make aliases containing :: resolvable in Livewire 4. In his account, Livewire 4’s resolver returned null rather than consulting the explicit component map. Registering the class namespace with Livewire::addNamespace() resolved that issue. Livewire’s package-development documentation also documents addNamespace() for package components, including class-based components.
The Flux tag and wire:key failure
The second problem was narrower. Hazim says Livewire 4’s SupportCompiledWireKeys precompiler inserted a PHP block before wire:key. On affected <flux:*> Blade component tags, that inserted block landed inside the tag, and Blade compilation then failed with syntax error, unexpected token "endif". His workaround was to remove wire:key from those Flux tags.
That workaround should not be read as a reason to remove keys from loops generally. Livewire 4’s upgrade documentation says livewire.smart_wire_keys now defaults to true, unlike Livewire 3, but still cautions that developers must add wire:key manually in loops. Hazim’s change addressed a reported precompiler interaction on Flux component tags; it is not a blanket substitute for keys in repeated content. See the Livewire 4 upgrade guide for the setting and its qualification.
Why not add a version check to the template?
Hazim considered a conditional in the Blade template but saw no safe shared outcome: keeping the key left the Livewire 4 issue unresolved, while removing it risked DOM-diffing problems for Livewire 3 users. Rather than add a version-specific branch in the template, he moved the package’s main line to Livewire ^4.0, Flux ^2.17, and PHP ^8.4. He describes this as a breaking feature change. Livewire 3 applications can use the package’s 1.0.x line.
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How to decide whether to support two major versions
Assess the promise against the actual fix, not just whether both versions can be installed. These questions make the trade-off concrete:
- Fix correctness by major: Does the proposed change behave correctly on every version you claim to support? If the answer is “only with a template condition” or another special case, establish that the condition is reliable and testable.
- Complexity at the seam: Does dual support create runtime checks, duplicate paths, or framework-specific exceptions that make the code harder to reason about?
- Verification quality: Can your test matrix exercise each claimed major with generated caches cleared or rebuilt for that version?
- User migration path: Can existing users remain on a maintained old-major branch? State the supported version range and the branch’s actual maintenance commitment rather than implying indefinite compatibility.
In Hazim’s case, the old-major path was the 1.0.x branch, while new development on the main line could target Livewire 4. His argument is that a compatibility promise should not force a known-bad compromise into the code being actively developed. That reasoning is strongest when the incompatibility is specific, the fix cannot safely serve both majors, and users have an explicit route to remain on the older line.
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Why a dependency upgrade can produce a false-green test run
A passing test suite is useful only if it ran against the dependency version you intended to validate. Hazim’s related account says compiled Blade views were cached using a key derived from Blade source, not from the Livewire major that compiled them. After switching Livewire versions, generated views could therefore remain from the other version unless the cache was cleared. He reports that a run showing 233 passing tests became 66 failures after the compiled views were deleted. Those counts and the cache explanation are his project’s reported experience, not independently reproduced results. See his related post on Blade caching and package tests.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsThe practical lesson is broader than Blade: when a generated artifact can outlive a dependency change, make cache state part of the test setup. Otherwise, a green run may verify old output rather than the code path the new dependency uses.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the maintainer reported testing for the Livewire 4 release
For the release described, Hazim reports testing Livewire v4.4.2 from a cold Blade cache twice and in a random-order run. He reports 233 tests passing, PHPStan level 5 with an empty baseline, and a clean Pint run. These are results reported by the package maintainer, not an independent audit. He also says the compatibility check was added to contributor guidance, reflecting a useful policy: a compatibility claim belongs in the test matrix, not just in the README.
Make the support promise match the code and tests
Before retaining two dependency majors—or ending support for one—write down what each promise requires. If a correct repair cannot work safely across both, decide whether a tested compatibility path on an older branch is more maintainable than version-specific logic in the main line. Then verify each supported path from a clean generated-cache state and document the exact versions users should install.
Hazim’s central question captures the decision: “If you’re maintaining a package sitting across a major-version boundary, the question worth asking isn’t ‘can I support both?’ It’s ‘is there a fix I’m not making because I support both?’”
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