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fix(form-core): stop DeepKeys and DeepValue expansion on self-referencing types - #2422
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…cing types DeepKeysAndValuesImpl had no cycle or depth guard, so a type that contains itself (for example a recursive JSON type or an index signature that refers to its own type) was expanded until TypeScript reported TS2589. Track the array, tuple and object types on the current path and stop when one of them is reached again. The remaining path is typed as an unknown accessor, the same fallback already used for unknown values. Types without self-references produce the same keys and values as before. Fixes TanStack#1474 Fixes TanStack#1484
🦋 Changeset detectedLatest commit: 7b0684f The changes in this PR will be included in the next version bump. This PR includes changesets to release 14 packages
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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughDeep-key traversal now tracks container types visited along each path. When a container type repeats, traversal emits an unknown-valued accessor instead of expanding it again. Type tests cover recursive paths, repeated non-recursive types, and optional properties. ChangesRecursive deep-key handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The recursive-type handling appears consistent with the form’s existing path behavior, and no verified issue remains that should block merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
Review comments at @packages/form-core/src/util-types.ts:
- Line 192: Update the recursive fallback in UnknownDeepKeyAndValue<TParent> so
its key pattern accepts bracket-prefixed suffixes, preserving paths with
consecutive array indexes such as data[0][0]. Add coverage verifying
DeepKeys<JsonForm> accepts consecutive array-index paths.
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.changeset/calm-keys-stop.mdpackages/form-core/src/util-types.tspackages/form-core/tests/util-types.test-d.ts
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When DeepKeysAndValuesImpl stops at a container type that repeats on the
path, the path continued as an unknown accessor that only allows a
`.${string}` suffix. For `type Json = Json[] | { [key: string]: Json }`
this rejected valid paths such as `data[0][0]`.
Use a dedicated accessor at the cut point that also accepts a bracket
suffix. The generic unknown accessor and types without self-references
are unchanged.
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🎯 Changes
Fixes #1474 and #1484.
Problem.
DeepKeysandDeepValuefail with TS2589 ("Type instantiation is excessively deep and possibly infinite") when the form values contain a self-referencing type, for example a recursive JSON type (#1474) or an index signature that refers to its own type (#1484). Onmain(2216fde)type K = DeepKeys<{ name: string; data: JsonData }>takes 5,001,167 instantiations and about 7.4 s of Check time on TypeScript 5.9.3 before it errors.Root cause.
DeepKeysAndValuesImplrecurses throughDeepKeyAndValueArray,DeepKeyAndValueTupleandDeepKeyAndValueObjectwith no cycle or depth guard, so a type that contains itself is expanded until the compiler gives up.Change.
DeepKeysAndValuesImpland the three helpers get an optionalTVisitedparameter (defaultnever) that collects the array, tuple and object types on the path from the root. When a container that is identical to one already on the path is reached again, the expansion stops and the path continues as the existing unknown accessor (UnknownDeepKeyAndValue, for example`data.${string}`). Identity (not assignability) is used so that a different but structurally similar nested type is never treated as a repeat. Types without self-references produce the same keys and values as before; this is covered by the existingutil-typestests plus two new cases (a type reused in sibling positions, and optional-only objects nested in a similar object).Files:
packages/form-core/src/util-types.ts,packages/form-core/tests/util-types.test-d.ts, one changeset.Tests. New type tests in
util-types.test-d.tsfor the #1474 and #1484 shapes, and for non-recursive shapes. With the fix reverted,tscreports five errors in the new tests (two TS2589 and three follow-on errors); with it applied,tscreports no errors on TypeScript 5.4.5 to 5.9.3 forform-core.form-coreunit tests: 510 passed, 3 todo;react-form: 126 passed.nx run-manyover the repo targets (test:sherif,test:eslint,test:lib,test:types,test:build,build) passed for all packages on a Linux machine (the targets ofpnpm test:pr, run withnx run-manyinstead ofnx affected).test:knipreports three unlisted@vue/*dependencies inpackages/vue-form/distafter the build step on my machine; this does not involveform-coreand I did not compare it againstmain.Measurement (whyts 0.6.0
compare, 10 runs per side, TypeScript 5.9.3; I am the author of whyts):DeepKeysandDeepValueof{ name; data: JsonData })packages/form-coretsconfig (501 files, no recursive types)For types without self-references the check adds a small amount of work (about 5% more instantiations in the
form-coreproject); the time difference there is within the noise of the measurement.Update (7b0684f). At the point where a self-referencing type is cut off, the path now continues as a recursive accessor that also accepts bracket suffixes, so
data[0][0]anddata[0][0].xare valid keys (reported by the CodeRabbit review). The generic unknown accessor is unchanged. Compared with the first commit,form-coreCheck time is 2.495 s to 2.47 s (within noise, whyts 0.7.1compare, 10 runs per side) and instantiations are +0.27%. Type tests pass on TypeScript 5.4 to 5.9.✅ Checklist
pnpm test:pr, or these tests do not apply to this pull request.🚀 Release Impact
Summary by CodeRabbit
DeepKeysandDeepValuebehavior for self-referencing types: path expansion stops when a container type repeats, while paths can continue through unknown accessors, including consecutive array indexes.