fix(@vben-core/shared): keep filterTree from mutating the source tree - #8370
fix(@vben-core/shared): keep filterTree from mutating the source tree#8370loseintwilight wants to merge 3 commits into
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filterTree assigned the filtered child array back onto the source node, so nodes that failed the predicate were dropped from the input tree permanently instead of only from the result. In frontend/mixed access mode generateRoutesByFrontend filters the module-level accessRoutes on every login and role refresh, so routes stripped for a low-privilege user stayed missing for later sessions until a full page reload. filterTree is now pure: matched nodes owning a child array are copied, nodes without children are still returned by reference.
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ChangesTree filtering immutability
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This fixes route and menu trees being altered by earlier filtering while retaining expected reference behavior. The affected filtering and route-reuse cases are covered, with no remaining merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant generateRoutesByFrontend
participant filterTree
participant accessRoutes
generateRoutesByFrontend->>filterTree: filter accessRoutes for user permissions
filterTree->>filterTree: copy only branches with changed children
filterTree-->>generateRoutesByFrontend: return filtered routes
filterTree-->>accessRoutes: preserve source route table
generateRoutesByFrontend->>filterTree: filter accessRoutes again
filterTree-->>generateRoutesByFrontend: return routes from unchanged source data
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In `@packages/`@core/base/shared/src/utils/tree.ts:
- Line 46: Correct the documentation for filterTree to state its actual
reference semantics: leaf nodes may be returned by reference, as implemented by
the no-children return path around line 76. Keep the documentation consistent
with the function’s compatibility behavior and avoid changing the
implementation.
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filterTree does not write its result back into the input tree, but childless matched nodes are still returned by reference. The previous comment claimed no source node is ever returned, which contradicted the implementation and could mislead callers.
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I found one reference-compatibility issue to clarify before merge. The parent implementation returned the original branch object when every node matched (
odes.filter(...)), so ilterTree([{ id: 1, children: [{ id: 2 }] }], () => true)[0] === input[0]. On the current head, line 78 spreads every node with a truthy child array, so an isolated Vitest identity check fails even though the values are equal. The PR description says existing reference semantics are preserved (only leaf nodes are intentionally by-reference), but branch identity is observably changed. Consumers that memoize or cache route/menu branch nodes can see a compatibility break. Please either preserve the branch reference when filtering leaves the child sequence unchanged, or explicitly document/test this intentional change and classify the release accordingly. Independent verification otherwise passed: the two relevant test files (22 tests), full typecheck, lint (0 errors; 12 pre-existing warnings), and diff check.
filterTree copied every matched branch node, so filtering a tree where nothing changed still returned new branch objects. The previous implementation used Array#filter, which keeps element references, so callers could rely on filterTree(input, () => true)[0] === input[0]. Branch nodes are now shallow-copied only when their child sequence actually changes; unchanged nodes are returned by reference, restoring the reference semantics callers had before. The mutation fix itself is unaffected: the filtered child array is never assigned back onto the source node.
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Thanks for the careful review — and for running the verification yourself. You're right, and I went with option (a). What changed (8042eb6): a matched branch node is now shallow-copied only when its child sequence actually changes. The mutation fix itself is unaffected — the filtered child array is still never assigned back onto the source node. Only the decision of whether to copy the parent changed. Two tests added so this can't regress in either direction:
Verification: Since branch identity is preserved, this stays a patch. |
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Description
The bug
filterTreewrites its result back onto the input node instead of building a new one:Every node that fails the predicate is therefore permanently removed from the input tree, not just from the returned array.
Why it matters
That input is a module-level constant in real apps. In
frontendandmixedaccess mode,generateRoutesByFrontendcallsfilterTree(routes, ...)onaccessRoutes(apps/*/src/router/routes/index.ts, built once viamergeRouteModules, which returns references to the original route objects) once per login and per role refresh.So after a low-privilege user signs in, the routes stripped for them are gone for every later session in the same page:
userlogs in →/dashboard/overview(authority: ['admin']) is dropped and written back intoaccessRoutes.adminlogs in in the same page session →/dashboardonly yields the children left over from step 1, so the admin gets an empty submenu.generateMenus(!!menu.show) andinitAffixTabs(router.getRoutes()) mutate their source the same way.The fix
filterTreeis now pure: the filtered child array is never assigned back onto the source node, so nothing is ever removed from the input tree.Reference semantics are preserved too. A matched node is shallow-copied only when its child sequence actually changes (compared by length and element identity); when nothing is filtered out, the original node object is returned as-is. So
filterTree(input, () => true)[0] === input[0]still holds, exactly as it did before this PR, and callers that memoize or compare branch nodes by reference are unaffected.This also makes it consistent with
sortTreeandmapTreein the same file, which already avoid mutating their input.Verification
Reproduces the route-table scenario through the real helper:
Test results (
vitest):main)Lint (
oxlint+oxfmt+eslint+stylelint): 0 errors. Typecheck (turbo run typecheck, 6 apps): 0 errors.The two tests added for the reference semantics pin the behaviour from both sides, so neither the mutation bug nor an over-eager copy can come back:
mainshould keep branch nodes by reference when no child is droppedshould only copy the branches on the path of a dropped nodeNotes
generateRoutesByFrontend,generateMenus,initAffixTabs) — none rely on node identity of branch nodes, and that identity is preserved by this PR anyway.metastays shared by reference in the shallow copy, sosetAffixTabs'tab.meta.affixTab = truestill behaves the same.filterTree,filterTree mutate/immutable/side effect,tree mutation,sortTree, menu/route loss keywords) and found none. The only related work is feat: 修正菜单排序在二级菜单不生效问题 #7007, which addedsortTreeand did not touch this.Type of change
pnpm-lock.yamlunless you introduce a new test example.Checklist
pnpm run docs:devcommand.pnpm test.feat:,fix:,perf:,docs:, orchore:.Summary by CodeRabbit
Bug Fixes
Tests