refactor(mosaic): pass props to machines through provide instead of context by alexcarpenter · Pull Request #10084 · clerk/javascript

alexcarpenter · 2026-10-05T23:39:37Z

Description

Mosaic machines now keep two things apart: the state a flow remembers (context) and what it's given from outside (callbacks, canSubmit, field config). Outside dependencies are named implementations (setup().extend + machine.provide), looked up when they run. setContext is removed.

Context is plain state in the migrated controllers (form, edit field, rename passkey, add email/phone, reverification). The snapshot, the logger and mockActor hold state like emailAddress, code and error, not callbacks. The unused sign-in and first-factor machines still keep callbacks in context.
The useMachine context option has one meaning: starting values. Before, it also reset those keys every render, silently undoing anything the machine had assigned. No current controller hits that; it only affects a machine that seeds a key it also assigns. A test covers it (fails before, passes after).

useMachine(
  userProfileRenamePasskeyMachine.provide({
    guards: { isSaveable: context => isSaveable(context.name, name, onRename) },
    actors: { rename: async context => onRename?.(id, context.name) },
  }),
);

Also fixes: a synchronous throw from an invoke src now goes to onError instead of throwing out of send().

Apart from that fix, no behavior change; the form and reverification controller tests pass against both the old and new code. The machine lib is internal to @clerk/mosaic.

Overlapping PRs: #9937 / #10078 and #9983 replace add email/phone and rename passkey (take theirs).

Call stack: rename passkey save, before and after

Before

render(props)
  useMachine(machine, { context: { passkeyId, savedName, onRename } })
  useLayoutEffect → actor.setContext({ passkeyId, savedName, onRename })   ← props copied into context every render
click Save
  actor.send({ type: 'SAVE' })
    pickTransition → guard(ctx) reads ctx.onRename
    startInvoke → src(ctx) calls ctx.onRename?.(ctx.passkeyId, ctx.name)

After

render(props)
  useMachine(machine.provide({ guards: { isSaveable }, actors: { rename } }))
  useLayoutEffect → actor.logic.implementations = machine.implementations   ← one swap, nothing copied
click Save
  actor.send({ type: 'SAVE' })
    pickTransition → resolveGuard('isSaveable') → implementations().guards.isSaveable   ← looked up when it runs
    startInvoke → resolveSrc('rename') → implementations().actors.rename

Checklist

pnpm test runs as expected.
pnpm build runs as expected.
(If applicable) JSDoc comments have been added or updated for any package exports
(If applicable) Documentation has been updated

Type of change

…o the machine lib

…ions

…entations

…ve model

…ontext

changeset-bot · 2026-10-05T23:39:43Z

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Latest commit: 877a599

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vercel · 2026-10-05T23:39:44Z

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packages/mosaic/src/machine/__tests__/use-machine.test.tsx

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📝 Walkthrough

Walkthrough

Mosaic machines add typed named guards, actions, and actors, with APIs to register and provide implementations. The actor runtime resolves these implementations and routes synchronous invoke-source errors to error handlers. useMachine and form, profile, and reverification controllers supply dependencies through implementations instead of machine context. Tests and examples cover the API and controller behavior.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~45 minutes

Merge Risk: 🔵 Low · up to 31d06

A missing actor implementation can leave a machine’s published state stale after a failed transition. Resolve that behavior before merging or explicitly accept the bounded risk.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 8.70% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 69 functions across 22 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: passing machine dependencies through provide instead of context.
Description check	✅ Passed	The description explains the context and implementation changes, the useMachine behavior, and the synchronous invoke error fix. It is directly related to the changeset.

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commit: 877a599

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Inline comments:
Review comments at @packages/mosaic/src/machine/create-actor.ts:
- Line 237: Resolve invoke.src before takeTransition changes the actor’s value,
runs exit or transition actions, or increments invocationToken, so a missing
named actor cannot leave mutated internal state without a committed snapshot.
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📒 Files selected for processing (24)

.changeset/mosaic-invoke-sync-throw.md
packages/mosaic/src/components/form/form.machine.ts
packages/mosaic/src/components/form/use-form.test.ts
packages/mosaic/src/components/form/use-form.ts
packages/mosaic/src/features/organization-profile/organization-profile-profile-section/organization-profile-edit-field.controller.ts
packages/mosaic/src/features/reverification/__tests__/reverification.controller.test.ts
packages/mosaic/src/features/reverification/reverification.controller.ts
packages/mosaic/src/features/user-profile/user-profile-account-section/user-profile-add-email.controller.ts
packages/mosaic/src/features/user-profile/user-profile-account-section/user-profile-add-phone.controller.ts
packages/mosaic/src/features/user-profile/user-profile-rename-passkey.controller.ts
packages/mosaic/src/machine/ADOPTION.md
packages/mosaic/src/machine/__tests__/implementations.test-d.ts
packages/mosaic/src/machine/__tests__/implementations.test.ts
packages/mosaic/src/machine/__tests__/machine.test.ts
packages/mosaic/src/machine/__tests__/use-machine.test.tsx
packages/mosaic/src/machine/__tests__/wizard-migration.test.tsx
packages/mosaic/src/machine/assign.ts
packages/mosaic/src/machine/create-actor.ts
packages/mosaic/src/machine/create-machine.ts
packages/mosaic/src/machine/setup.ts
packages/mosaic/src/machine/types.ts
packages/mosaic/src/machine/use-machine.ts
packages/mosaic/src/machines/first-factor-machine.ts
packages/mosaic/src/machines/sign-in-machine.ts

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…mments

alexcarpenter added 8 commits October 5, 2026 19:33

fix(mosaic): route synchronous throws from invoke src to onError

d391e17

feat(mosaic): add named implementations, provide, and action params t…

6128ead

…o the machine lib

refactor(mosaic): provide the edit field callbacks as implementations

3eb10aa

refactor(mosaic): provide the rename passkey callbacks as implementat…

50b7366

…ions

refactor(mosaic): provide add email and add phone callbacks as implem…

83a3c1c

…entations

refactor(mosaic): provide reverification callbacks from the last acti…

c807f9c

…ve model

refactor(mosaic): provide form config as implementations instead of c…

cf12beb

…ontext

refactor(mosaic): remove setContext in favor of provided implementations

05a3026

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Comment thread packages/mosaic/src/machine/create-actor.ts

chore(mosaic): trim machine lib comments that restate the code

2f9923a

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chore(mosaic): drop references to other libraries from machine lib co…

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…mments

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alexcarpenter changed the title ~~fix(mosaic): pass changing props to machines through provide instead of context~~ refactor(mosaic): pass props to machines through provide instead of context Oct 6, 2026

test(mosaic): assert the useMachine context option only seeds the actor

31d06fa

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alexcarpenter marked this pull request as draft October 6, 2026 02:20

docs(mosaic): show sign-in machine deps are fixed at creation

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refactor(mosaic): pass props to machines through provide instead of context - #10084

refactor(mosaic): pass props to machines through provide instead of context#10084
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