From 3c16db6909a107ddf119050dad65bf9455631df6 Mon Sep 17 00:00:00 2001 From: BCsabaEngine Date: Thu, 20 Aug 2026 07:59:40 +0200 Subject: [PATCH 1/4] fix: proxy pollution --- src/proxy.ts | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/src/proxy.ts b/src/proxy.ts index 25e7da8..372b130 100644 --- a/src/proxy.ts +++ b/src/proxy.ts @@ -1,3 +1,5 @@ +import { DANGEROUS_KEYS } from './internal/paths'; + export type ProxyChanged = ( target: T, property: string, @@ -58,6 +60,10 @@ export const ChangeProxy = (source: T, changed: ProxyChanged)[property]; + // Never hand back a reactive wrapper around __proto__/constructor/prototype: for + // __proto__ that value is the real, shared Object.prototype, and wrapping it would let + // a write through the returned proxy pollute every object in the process. + if (DANGEROUS_KEYS.has(property)) return (object as Record)[property]; const value = (object as Record)[property]; if (isProxiable(value)) return createProxy(value as object, resolvePath(object, property, parentPath)); return value; @@ -68,6 +74,10 @@ export const ChangeProxy = (source: T, changed: ProxyChanged)[property] = incomingValue; return true; } + // Silently reject writes to __proto__/constructor/prototype, same as setValueAtPath and + // safeMerge do, so an untrusted payload (e.g. Object.assign(data, JSON.parse(input))) + // can't repoint the state object's prototype. + if (DANGEROUS_KEYS.has(property)) return true; // Storing a proxy inside the raw tree would make later mutations report the path the // value was read from rather than the one it was written to. const nextValue = unwrap(incomingValue); @@ -81,6 +91,7 @@ export const ChangeProxy = (source: T, changed: ProxyChanged)[property]; From d12ddd1b9daa1eb368ad3de4b3025c0ae903a392 Mon Sep 17 00:00:00 2001 From: BCsabaEngine Date: Thu, 20 Aug 2026 07:59:52 +0200 Subject: [PATCH 2/4] fix: add missing tests --- test/async-validation.test.svelte.ts | 95 +++++++++++ test/plugins-analytics.test.svelte.ts | 24 +++ test/plugins-autosave.test.svelte.ts | 46 ++++++ test/plugins-devtools.test.svelte.ts | 59 +++++++ test/plugins-history.test.svelte.ts | 17 ++ test/plugins-persist.test.svelte.ts | 102 ++++++++++++ test/plugins-sync.test.svelte.ts | 48 ++++++ test/plugins-undo-redo.test.svelte.ts | 37 +++++ test/proxy.test.ts | 101 ++++++++++++ test/state.test.svelte.ts | 219 ++++++++++++++++++++++++++ test/validators.test.ts | 74 +++++++++ 11 files changed, 822 insertions(+) diff --git a/test/async-validation.test.svelte.ts b/test/async-validation.test.svelte.ts index 7b0e7e7..85619e4 100644 --- a/test/async-validation.test.svelte.ts +++ b/test/async-validation.test.svelte.ts @@ -171,6 +171,48 @@ describe('async validation - cancellation', () => { }); }); +describe('async validation - error handling', () => { + it('should store the error message when the async validator throws', async () => { + const { data, state } = createSvState( + { username: '' }, + { + asyncValidator: { + username: async () => { + throw new Error('Server unreachable'); + } + } + }, + { debounceAsyncValidation: 10 } + ); + + data.username = 'test'; + await new Promise((resolve) => setTimeout(resolve, 50)); + + expect(get(state.asyncErrors)).toEqual({ username: 'Server unreachable' }); + expect(get(state.hasAsyncErrors)).toBe(true); + expect(get(state.asyncValidating)).toEqual([]); + }); + + it('should unwrap a non-Error throw into a message', async () => { + const { data, state } = createSvState( + { username: '' }, + { + asyncValidator: { + username: async () => { + throw 'plain string rejection'; + } + } + }, + { debounceAsyncValidation: 10 } + ); + + data.username = 'test'; + await new Promise((resolve) => setTimeout(resolve, 50)); + + expect(get(state.asyncErrors)).toEqual({ username: 'plain string rejection' }); + }); +}); + describe('async validation - asyncValidating store', () => { it('should update asyncValidating store during validation', async () => { const { data, state } = createSvState( @@ -561,6 +603,59 @@ describe('async validation - nested paths', () => { expect(isAsyncValidatorCalled).toBe(true); expect(get(state.asyncErrors)).toEqual({ user: 'User invalid' }); }); + + it('should pass undefined to the validator when a path segment resolves through a null ancestor', async () => { + let receivedValue: unknown = 'not called'; + + const { data } = createSvState( + { user: { email: 'x@y.z' } as { email: string } | null }, + { + asyncValidator: { + 'user.email': async (value) => { + receivedValue = value; + return ''; + } + } + }, + { debounceAsyncValidation: 10 } + ); + + // "user" becoming null matches registered "user.email" (parent triggers child), and reading + // through the now-null "user" must not throw + // eslint-disable-next-line unicorn/no-null + data.user = null; + await new Promise((resolve) => setTimeout(resolve, 50)); + + expect(receivedValue).toBeUndefined(); + }); + + it('should still run when only a descendant path has a sync error, not the registered path itself', async () => { + let isAsyncValidatorCalled = false; + + const { data, state } = createSvState( + { user: { name: 'x' } }, + { + validator: (source) => ({ + user: { name: source.user.name ? '' : 'Required' } + }), + asyncValidator: { + // "user" itself resolves to a nested object, not a string, so the sync-error check + // (which only looks at the exact registered path) must not block this + user: async () => { + isAsyncValidatorCalled = true; + return ''; + } + } + }, + { debounceAsyncValidation: 10 } + ); + + data.user.name = ''; + await new Promise((resolve) => setTimeout(resolve, 50)); + + expect(get(state.errors)).toEqual({ user: { name: 'Required' } }); + expect(isAsyncValidatorCalled).toBe(true); + }); }); describe('async validation - receives full source', () => { diff --git a/test/plugins-analytics.test.svelte.ts b/test/plugins-analytics.test.svelte.ts index fad5238..2dd70cb 100644 --- a/test/plugins-analytics.test.svelte.ts +++ b/test/plugins-analytics.test.svelte.ts @@ -41,6 +41,30 @@ describe('analyticsPlugin', () => { expect(flushed.length).toBeGreaterThanOrEqual(1); }); + it('should use the default 5000ms flush interval when not specified', () => { + vi.useFakeTimers(); + try { + const flushed: AnalyticsEvent[][] = []; + const analytics = analyticsPlugin({ + onFlush: (events) => { + flushed.push([...events]); + }, + batchSize: 100 + }); + const { data, destroy } = createSvState({ name: 'test' }, undefined, { plugins: [analytics] }); + + data.name = 'updated'; + expect(flushed.length).toBe(0); + + vi.advanceTimersByTime(5000); + expect(flushed.length).toBe(1); + + destroy(); + } finally { + vi.useRealTimers(); + } + }); + it('should filter by include types', () => { const flushed: AnalyticsEvent[][] = []; const analytics = analyticsPlugin({ diff --git a/test/plugins-autosave.test.svelte.ts b/test/plugins-autosave.test.svelte.ts index 175d756..fc681bc 100644 --- a/test/plugins-autosave.test.svelte.ts +++ b/test/plugins-autosave.test.svelte.ts @@ -117,6 +117,52 @@ describe('autosavePlugin', () => { expect(saved.length).toBeGreaterThanOrEqual(2); }); + it('should run a save requested while one is already in flight instead of dropping it', async () => { + const saveCalls: string[] = []; + const { promise: inFlight, resolve: resolveInFlight } = Promise.withResolvers(); + const autosave = autosavePlugin({ + save: async (data) => { + saveCalls.push((data as { name: string }).name); + if (saveCalls.length === 1) await inFlight; + }, + idle: 5000, + interval: 15, + onlyWhenDirty: false, + saveOnDestroy: false + }); + const { data, destroy } = createSvState({ name: 'a' }, undefined, { plugins: [autosave] }); + + // First interval tick starts the save and hangs on the unresolved promise + await new Promise((r) => setTimeout(r, 25)); + expect(autosave.isSaving()).toBe(true); + + data.name = 'b'; + // A later interval tick requests a save while the first is still in flight, and must not be + // dropped even though `isSaving` was true at request time + await new Promise((r) => setTimeout(r, 25)); + + resolveInFlight(); + await new Promise((r) => setTimeout(r, 15)); + destroy(); + + expect(saveCalls[0]).toBe('a'); + expect(saveCalls).toContain('b'); + expect(autosave.isSaving()).toBe(false); + }); + + it('should not touch document when onVisibilityHidden is set but document is unavailable', () => { + const autosave = autosavePlugin({ + save: () => {}, + onVisibilityHidden: true, + saveOnDestroy: false + }); + + expect(() => { + const { destroy } = createSvState({ name: 'a' }, undefined, { plugins: [autosave] }); + destroy(); + }).not.toThrow(); + }); + it('should clear idle timer after successful action', async () => { const saved: unknown[] = []; const autosave = autosavePlugin({ diff --git a/test/plugins-devtools.test.svelte.ts b/test/plugins-devtools.test.svelte.ts index e6db039..c213201 100644 --- a/test/plugins-devtools.test.svelte.ts +++ b/test/plugins-devtools.test.svelte.ts @@ -77,6 +77,65 @@ describe('devtoolsPlugin', () => { expect(actionCalls.length).toBe(2); }); + it('should default to enabled outside of production when enabled is not specified', () => { + const devtools = devtoolsPlugin(); + const { data } = createSvState({ name: 'test' }, undefined, { plugins: [devtools] }); + + data.name = 'updated'; + + expect(groupCollapsedSpy).toHaveBeenCalled(); + }); + + it('should include from/to values when logValues is true', () => { + const devtools = devtoolsPlugin({ enabled: true, logValues: true }); + const { data } = createSvState({ name: 'old' }, undefined, { plugins: [devtools] }); + + data.name = 'new'; + + const changeDetail = logSpy.mock.calls.find((c) => (c[0] as { property?: string })?.property === 'name')?.[0] as + { from?: string; to?: string } | undefined; + expect(changeDetail).toEqual({ property: 'name', from: 'old', to: 'new' }); + }); + + it('should log the error message when an action fails', async () => { + const devtools = devtoolsPlugin({ enabled: true }); + const { execute } = createSvState( + { name: 'test' }, + { + action: async () => { + throw new Error('boom'); + } + }, + { plugins: [devtools] } + ); + + await execute(); + + const errorDetail = logSpy.mock.calls.find((c) => (c[0] as { error?: string })?.error === 'boom'); + expect(errorDetail).toBeDefined(); + }); + + it('should log snapshot, rollback and reset events', () => { + const devtools = devtoolsPlugin({ enabled: true }); + const { data, rollback, reset } = createSvState( + { name: 'initial' }, + { effect: ({ snapshot }) => snapshot('Changed') }, + { plugins: [devtools] } + ); + + data.name = 'updated'; + const snapshotCall = groupCollapsedSpy.mock.calls.find((c) => (c[0] as string).includes('snapshot')); + expect(snapshotCall).toBeDefined(); + + rollback(); + const rollbackCall = groupCollapsedSpy.mock.calls.find((c) => (c[0] as string).includes('rollback')); + expect(rollbackCall).toBeDefined(); + + reset(); + const resetCall = groupCollapsedSpy.mock.calls.find((c) => (c[0] as string).includes('reset')); + expect(resetCall).toBeDefined(); + }); + it('should use custom name in log prefix', () => { const devtools = devtoolsPlugin({ enabled: true, name: 'myForm' }); const { data } = createSvState({ name: 'test' }, undefined, { plugins: [devtools] }); diff --git a/test/plugins-history.test.svelte.ts b/test/plugins-history.test.svelte.ts index d9113c4..1e2f332 100644 --- a/test/plugins-history.test.svelte.ts +++ b/test/plugins-history.test.svelte.ts @@ -146,6 +146,23 @@ describe('historyPlugin', () => { expect(popstateListeners.length).toBe(0); }); + it('should stay a safe no-op during SSR, where window is unavailable', () => { + // Undo the beforeEach mock: neither onInit's URL read nor onChange's URL write may touch it + delete (globalThis as Record).window; + + const history = historyPlugin({ fields: { query: 'q' } }); + + expect(() => { + const { data, destroy } = createSvState({ query: 'initial' }, undefined, { plugins: [history] }); + expect(data.query).toBe('initial'); + + data.query = 'changed'; + expect(data.query).toBe('changed'); + + destroy(); + }).not.toThrow(); + }); + describe('nested fields', () => { it('should update URL when a dotted field is mutated directly', () => { const history = historyPlugin({ fields: { 'filters.q': 'q' } }); diff --git a/test/plugins-persist.test.svelte.ts b/test/plugins-persist.test.svelte.ts index fecfe3f..e3bf980 100644 --- a/test/plugins-persist.test.svelte.ts +++ b/test/plugins-persist.test.svelte.ts @@ -15,6 +15,19 @@ function createMockStorage() { } describe('persistPlugin', () => { + it('should stay a safe no-op when no storage option is given and no global localStorage exists', () => { + const persist = persistPlugin({ key: 'test', throttle: 10 }); + + expect(() => { + const { data } = createSvState({ name: 'initial' }, undefined, { plugins: [persist] }); + expect(data.name).toBe('initial'); + expect(persist.isRestored()).toBe(false); + + data.name = 'changed'; + persist.clearPersistedState(); + }).not.toThrow(); + }); + it('should hydrate state from storage on init', () => { const storage = createMockStorage(); storage.setItem('test', JSON.stringify({ version: 1, data: { name: 'stored' } })); @@ -27,6 +40,20 @@ describe('persistPlugin', () => { expect(persist.isRestored()).toBe(true); }); + it('should ignore a __proto__ key in stored data instead of merging it', () => { + const storage = createMockStorage(); + // A raw JSON string (not an object literal) is required: JSON.parse gives "__proto__" a real + // own property, whereas `{ __proto__: ... }` as a literal would just set the prototype. + storage.setItem('test', '{"version":1,"data":{"name":"stored","__proto__":{"polluted":true}}}'); + + const persist = persistPlugin({ key: 'test', storage }); + const { data } = createSvState({ name: 'initial' }, undefined, { plugins: [persist] }); + + expect(data.name).toBe('stored'); + expect(Object.getPrototypeOf(data)).toBe(Object.prototype); + expect(({} as Record).polluted).toBeUndefined(); + }); + it('should not restore if no stored data', () => { const storage = createMockStorage(); const persist = persistPlugin({ key: 'test', storage }); @@ -67,6 +94,40 @@ describe('persistPlugin', () => { expect(stored.data.count).toBeUndefined(); }); + it('should persist a nested include path, creating intermediate objects as needed', async () => { + const storage = createMockStorage(); + const persist = persistPlugin({ key: 'test', storage, throttle: 10, include: ['user.address.city'] }); + const { data } = createSvState({ user: { address: { city: 'Berlin', zip: '10115' } }, count: 0 }, undefined, { + plugins: [persist] + }); + + data.user.address.city = 'Vienna'; + await new Promise((r) => setTimeout(r, 50)); + + const stored = JSON.parse(storage.getItem('test')!); + expect(stored.data).toEqual({ user: { address: { city: 'Vienna' } } }); + }); + + it('should skip include paths that are or traverse through a dangerous key', async () => { + const storage = createMockStorage(); + const persist = persistPlugin({ + key: 'test', + storage, + throttle: 10, + // 'constructor' alone and 'constructor.name' both resolve to a defined value (the real + // Object constructor / its name), so this exercises setValueAtPath's own guard rather + // than being filtered out earlier by "value === undefined". + include: ['name', 'constructor', 'constructor.name'] + }); + const { data } = createSvState({ name: 'test' }, undefined, { plugins: [persist] }); + + data.name = 'updated'; + await new Promise((r) => setTimeout(r, 50)); + + const stored = JSON.parse(storage.getItem('test')!); + expect(stored.data).toEqual({ name: 'updated' }); + }); + it('should respect exclude paths', async () => { const storage = createMockStorage(); const persist = persistPlugin({ key: 'test', storage, throttle: 10, exclude: ['secret'] }); @@ -80,6 +141,47 @@ describe('persistPlugin', () => { expect(stored.data.secret).toBeUndefined(); }); + it('should respect a nested exclude path without disturbing its siblings', async () => { + const storage = createMockStorage(); + const persist = persistPlugin({ key: 'test', storage, throttle: 10, exclude: ['user.secret'] }); + const { data } = createSvState({ user: { name: 'test', secret: 'hidden' }, count: 0 }, undefined, { + plugins: [persist] + }); + + data.count = 1; + await new Promise((r) => setTimeout(r, 50)); + + const stored = JSON.parse(storage.getItem('test')!); + expect(stored.data).toEqual({ user: { name: 'test' }, count: 1 }); + }); + + it('should ignore stored data that is not a valid StorageFormat', () => { + const storage = createMockStorage(); + storage.setItem('test', JSON.stringify({ notAVersion: true })); + + const persist = persistPlugin({ key: 'test', storage }); + const { data } = createSvState({ name: 'initial' }, undefined, { plugins: [persist] }); + + expect(data.name).toBe('initial'); + expect(persist.isRestored()).toBe(false); + }); + + it('should ignore migration output that is not a plain object', () => { + const storage = createMockStorage(); + storage.setItem('test', JSON.stringify({ version: 1, data: { fullName: 'John Doe' } })); + + const persist = persistPlugin({ + key: 'test', + storage, + version: 2, + migrate: () => 'not-an-object' + }); + const { data } = createSvState({ name: 'initial' }, undefined, { plugins: [persist] }); + + expect(data.name).toBe('initial'); + expect(persist.isRestored()).toBe(false); + }); + it('should run migration when version changes', () => { const storage = createMockStorage(); storage.setItem('test', JSON.stringify({ version: 1, data: { fullName: 'John Doe' } })); diff --git a/test/plugins-sync.test.svelte.ts b/test/plugins-sync.test.svelte.ts index 2e04660..f8dc38d 100644 --- a/test/plugins-sync.test.svelte.ts +++ b/test/plugins-sync.test.svelte.ts @@ -62,6 +62,23 @@ describe('syncPlugin', () => { expect(state2.data.name).toBe('updated'); }); + it('should reject an incoming payload nested deeper than the depth limit', async () => { + const sync1 = syncPlugin({ key: 'depth-test', throttle: 10 }); + const sync2 = syncPlugin({ key: 'depth-test', throttle: 10 }); + + const state1 = createSvState({ deep: 'unset' as unknown }, undefined, { plugins: [sync1] }); + const state2 = createSvState({ deep: 'unset' as unknown }, undefined, { plugins: [sync2] }); + + // 12 levels of object nesting inside "deep" pushes the whole payload past the 10-level limit + let tooDeep: unknown = 'leaf'; + for (let index = 0; index < 12; index++) tooDeep = { nested: tooDeep }; + + state1.data.deep = tooDeep; + await new Promise((r) => setTimeout(r, 40)); + + expect(state2.data.deep).toBe('unset'); + }); + it('should not create echo loops', async () => { const sync1 = syncPlugin({ key: 'echo-test', throttle: 10 }); const sync2 = syncPlugin({ key: 'echo-test', throttle: 10 }); @@ -186,4 +203,35 @@ describe('syncPlugin inbound throttling', () => { expect(errors).toHaveLength(1); }); + + it('should stay a safe no-op when BroadcastChannel is unavailable', async () => { + vi.stubGlobal('BroadcastChannel', undefined); + + const sync = syncPlugin({ key: 'no-bc', throttle: 10 }); + const { data, destroy } = createSvState({ name: 'initial' }, undefined, { plugins: [sync] }); + + data.name = 'updated'; + // Let the throttled broadcast actually fire with no channel to post through, instead of + // cancelling it via an immediate destroy() + await new Promise((resolve) => setTimeout(resolve, 30)); + + expect(() => destroy()).not.toThrow(); + }); + + it('should ignore a non-sync message and a non-object payload', async () => { + const sync1 = syncPlugin({ key: 'ignore-test', throttle: 10 }); + const sync2 = syncPlugin({ key: 'ignore-test', throttle: 10 }); + + const state1 = createSvState({ name: 'initial' }, undefined, { plugins: [sync1] }); + const state2 = createSvState({ name: 'initial' }, undefined, { plugins: [sync2] }); + + const channel = MockBroadcastChannel.channels.get('ignore-test')![0]!; + channel.postMessage({ type: 'not-sync', data: { name: 'should-not-apply' } }); + channel.postMessage({ type: 'sync', data: 'not-an-object' }); + + await new Promise((r) => setTimeout(r, 30)); + + expect(state1.data.name).toBe('initial'); + expect(state2.data.name).toBe('initial'); + }); }); diff --git a/test/plugins-undo-redo.test.svelte.ts b/test/plugins-undo-redo.test.svelte.ts index 10fe3a8..99a8b92 100644 --- a/test/plugins-undo-redo.test.svelte.ts +++ b/test/plugins-undo-redo.test.svelte.ts @@ -105,6 +105,43 @@ describe('undoRedoPlugin', () => { destroy(); expect(undoRedo.canRedo()).toBe(false); }); + + it('should not push a redo entry when rollback(0) leaves the snapshot list unchanged', () => { + const { data, rollback, undoRedo } = createTestState(); + + data.name = 'updated'; + // steps=0 targets the current tip, so restoreToSnapshot doesn't shrink the snapshot list + // and the plugin's subscription never captures a "previous tip" to push onto the redo stack + rollback(0); + + expect(data.name).toBe('updated'); + expect(undoRedo.canRedo()).toBe(false); + }); +}); + +describe('undoRedoPlugin maxRedoStack', () => { + it('should drop the oldest redo entry once the configured maximum is exceeded', () => { + const undoRedo = undoRedoPlugin<{ a: number; b: number; c: number }>({ maxRedoStack: 2 }); + const { data, rollback } = createSvState( + { a: 0, b: 0, c: 0 }, + { effect: ({ snapshot, property }) => snapshot(`Changed ${property}`) }, + { plugins: [undoRedo] } + ); + + data.a = 1; // Changed a + data.b = 2; // Changed b + data.c = 3; // Changed c + + // Each rollback undoes the current tip and pushes it onto the redo stack, so the push order + // is the reverse of the change order: "Changed c" first, then "Changed b", then "Changed a" + rollback(); + rollback(); + rollback(); + + const stack = get(undoRedo.redoStack); + // "Changed c" (pushed first) is dropped once the stack exceeds maxRedoStack + expect(stack.map((s) => s.title)).toEqual(['Changed b', 'Changed a']); + }); }); describe('undoRedoPlugin multi-step redo', () => { diff --git a/test/proxy.test.ts b/test/proxy.test.ts index fbd3090..b19c138 100644 --- a/test/proxy.test.ts +++ b/test/proxy.test.ts @@ -370,6 +370,32 @@ describe('ChangeProxy', () => { expect(changed).toHaveBeenCalledWith(expect.any(Object), '123abc', 'updated', 'test'); }); + + it('should set a symbol-keyed property directly on the raw object without reporting a change', () => { + const source: Record = {}; + const changed = vi.fn(); + const proxy = ChangeProxy(source, changed) as Record; + const sym = Symbol('tag'); + + proxy[sym] = 'value'; + + expect(source[sym]).toBe('value'); + expect(proxy[sym]).toBe('value'); + expect(changed).not.toHaveBeenCalled(); + }); + + it('should delete a symbol-keyed property directly on the raw object without reporting a change', () => { + const sym = Symbol('tag'); + const source: Record = { [sym]: 'value' }; + const changed = vi.fn(); + const proxy = ChangeProxy(source, changed) as Record; + + const wasDeleted = delete proxy[sym]; + + expect(wasDeleted).toBe(true); + expect(Object.hasOwn(source, sym)).toBe(false); + expect(changed).not.toHaveBeenCalled(); + }); }); }); @@ -460,3 +486,78 @@ describe('ChangeProxy identity, deletes and paths', () => { expect(changed).toHaveBeenNthCalledWith(2, expect.any(Object), 'list', 1, 3); }); }); + +describe('prototype pollution guard', () => { + it('should not reassign the raw object prototype via __proto__', () => { + const source: Record = { a: 1 }; + const changed = vi.fn(); + const proxy = ChangeProxy(source, changed) as Record; + + proxy.__proto__ = { isAdmin: true }; + + expect(Object.getPrototypeOf(source)).toBe(Object.prototype); + expect((source as { isAdmin?: boolean }).isAdmin).toBeUndefined(); + expect(changed).not.toHaveBeenCalled(); + }); + + it('should not create own constructor/prototype properties', () => { + const source: Record = { a: 1 }; + const changed = vi.fn(); + const proxy = ChangeProxy(source, changed) as Record; + + proxy.constructor = 'hijacked'; + proxy.prototype = 'hijacked'; + + expect(Object.hasOwn(source, 'constructor')).toBe(false); + expect(Object.hasOwn(source, 'prototype')).toBe(false); + expect(changed).not.toHaveBeenCalled(); + }); + + it('should no-op deleting __proto__ without throwing or affecting the prototype', () => { + const source: Record = { a: 1 }; + const proxy = ChangeProxy(source, vi.fn()) as Record; + + expect(() => delete proxy.__proto__).not.toThrow(); + expect(Object.getPrototypeOf(source)).toBe(Object.prototype); + }); + + it('should not pollute the prototype via Object.assign with a __proto__ payload', () => { + const source: Record = { a: 1 }; + const proxy = ChangeProxy(source, vi.fn()) as Record; + + const untrusted = JSON.parse('{"__proto__":{"polluted":"yes"}}') as Record; + Object.assign(proxy, untrusted); + + expect(Object.getPrototypeOf(source)).toBe(Object.prototype); + expect((source as { polluted?: string }).polluted).toBeUndefined(); + }); + + it('should return the real prototype from __proto__, not a reactive wrapper', () => { + const source: Record = { a: 1 }; + const proxy = ChangeProxy(source, vi.fn()) as Record; + + expect(proxy.__proto__).toBe(Object.prototype); + }); + + it('should return the real constructor unwrapped, not a reactive proxy', () => { + const source: Record = { a: 1 }; + const proxy = ChangeProxy(source, vi.fn()) as Record; + + expect(proxy.constructor).toBe(Object); + }); + + it('should guard __proto__/constructor/prototype at any nesting depth, not just the root', () => { + const source = { nested: { a: 1 } as Record }; + const changed = vi.fn(); + const proxy = ChangeProxy(source, changed) as { nested: Record }; + + proxy.nested.__proto__ = { isAdmin: true }; + proxy.nested.constructor = 'hijacked'; + delete proxy.nested.__proto__; + + expect(Object.getPrototypeOf(source.nested)).toBe(Object.prototype); + expect(Object.hasOwn(source.nested, 'constructor')).toBe(false); + expect((source.nested as { isAdmin?: boolean }).isAdmin).toBeUndefined(); + expect(changed).not.toHaveBeenCalled(); + }); +}); diff --git a/test/state.test.svelte.ts b/test/state.test.svelte.ts index 5e5cc3e..785d35d 100644 --- a/test/state.test.svelte.ts +++ b/test/state.test.svelte.ts @@ -49,6 +49,20 @@ class ParentClass { } } +// Plain-object accessors (unlike a class's get/set, which live on the shared prototype) are own +// properties of the instance, so deepClone must special-case them to avoid flattening into a value. +const createAccessorState = (cents = 0) => ({ + cents, + get dollars(): number { + // eslint-disable-next-line unicorn/no-this-outside-of-class -- own-property accessor on a plain object, not a class + return this.cents / 100; + }, + set dollars(value: number) { + // eslint-disable-next-line unicorn/no-this-outside-of-class -- own-property accessor on a plain object, not a class + this.cents = Math.round(value * 100); + } +}); + describe('createSvState basic functionality', () => { it('should create state with initial data', () => { const { data } = createSvState({ name: 'test', count: 5 }); @@ -372,6 +386,26 @@ describe('rollback', () => { expect(get(state.snapshots)).toHaveLength(1); }); + it('should do nothing when steps is negative enough to target a non-existent snapshot', () => { + const { data, rollback, state } = createSvState( + { value: 0 }, + { + effect: ({ snapshot }) => { + snapshot('Changed', false); + } + } + ); + + data.value = 1; + const snapshotsBefore = get(state.snapshots); + + // steps=-5 targets an index past the end of the snapshot history + rollback(-5); + + expect(data.value).toBe(1); + expect(get(state.snapshots)).toEqual(snapshotsBefore); + }); + it('should trigger validation after rollback', () => { const { data, rollback, state } = createSvState( { name: 'initial' }, @@ -617,6 +651,54 @@ describe('actionError', () => { expect(get(state.actionError)).toBeUndefined(); }); + it('should read .message off a thrown non-Error object', async () => { + const { execute, state } = createSvState( + { value: 0 }, + { + action: async () => { + throw { message: 'Object error' }; + } + } + ); + + await execute(); + + expect(get(state.actionError)).toBeInstanceOf(Error); + expect(get(state.actionError)?.message).toBe('Object error'); + }); + + it('should fall back to .body.message when .message is absent', async () => { + const { execute, state } = createSvState( + { value: 0 }, + { + action: async () => { + throw { body: { message: 'Nested body error' } }; + } + } + ); + + await execute(); + + expect(get(state.actionError)).toBeInstanceOf(Error); + expect(get(state.actionError)?.message).toBe('Nested body error'); + }); + + it('should stringify a thrown object with neither .message nor .body.message', async () => { + const { execute, state } = createSvState( + { value: 0 }, + { + action: async () => { + throw { code: 500 }; + } + } + ); + + await execute(); + + expect(get(state.actionError)).toBeInstanceOf(Error); + expect(get(state.actionError)?.message).toBe('[object Object]'); + }); + it('should persist actionError when persistActionError is true', async () => { const { data, execute, state } = createSvState( { value: 0 }, @@ -1639,6 +1721,58 @@ describe('non-plain values in state', () => { expect(Object.hasOwn(data, 'b')).toBe(false); }); + + it('should carry Promise/WeakMap/Error fields by reference through rollback', () => { + const promise = Promise.resolve(1); + const weakMap = new WeakMap(); + const error = new Error('boom'); + + const { data, rollback } = createSvState( + { promise, weakMap, error, label: 'x' }, + { effect: ({ snapshot }) => snapshot('change') } + ); + + data.label = 'y'; + rollback(); + + expect(data.promise).toBe(promise); + expect(data.weakMap).toBe(weakMap); + expect(data.error).toBe(error); + }); + + it('should preserve an own getter/setter through rollback instead of flattening it to a value', () => { + const { data, rollback } = createSvState(createAccessorState(150), { + effect: ({ snapshot }) => snapshot('change') + }); + + expect(data.dollars).toBe(1.5); + + data.dollars = 9.99; + expect(data.cents).toBe(999); + + rollback(); + + expect(data.cents).toBe(150); + expect(data.dollars).toBe(1.5); + + // The setter must still run through the accessor, not a plain flattened value + data.dollars = 2; + expect(data.cents).toBe(200); + }); + + it('should drop an own constructor/prototype key when snapshotting', () => { + const init = { name: 'x', constructor: 'hijacked', prototype: 'hijacked' } as unknown as { name: string }; + const { data, rollback } = createSvState(init, { effect: ({ snapshot }) => snapshot('change') }); + + expect(Object.hasOwn(data, 'constructor')).toBe(true); + + data.name = 'y'; + rollback(); + + expect(data.name).toBe('x'); + expect(Object.hasOwn(data, 'constructor')).toBe(false); + expect(Object.hasOwn(data, 'prototype')).toBe(false); + }); }); describe('destroy cleanup', () => { @@ -1685,6 +1819,28 @@ describe('destroy cleanup', () => { expect(validations).toBe(before); }); + it('should skip a validation microtask scheduled before destroy runs before it fires', async () => { + let validations = 0; + const { data, destroy } = createSvState( + { value: 0 }, + { + validator: () => { + validations++; + return {}; + } + } + ); + + const before = validations; + // debounceValidation defaults to 0, so this schedules the pending run via queueMicrotask + data.value = 1; + destroy(); + await Promise.resolve(); + await Promise.resolve(); + + expect(validations).toBe(before); + }); + it('should be safe to call twice', () => { let destroyCalls = 0; const { destroy } = createSvState( @@ -1806,6 +1962,44 @@ describe('batch', () => { expect(data.b).toBe(2); expect(get(state.snapshots)).toHaveLength(2); }); + + it('should schedule each async validator at most once for the whole batch', async () => { + let callCount = 0; + const { batch, state } = createSvState( + { a: '', b: '' }, + { + asyncValidator: { + a: async () => { + callCount++; + return ''; + } + } + }, + { debounceAsyncValidation: 10 } + ); + + batch((draft) => { + draft.a = 'one'; + draft.a = 'two'; + draft.a = 'three'; + }); + + await new Promise((resolve) => setTimeout(resolve, 50)); + + expect(callCount).toBe(1); + expect(get(state.asyncErrors)).toEqual({ a: '' }); + }); + + it('should do nothing when called after destroy', () => { + const { data, batch, destroy } = createSvState({ a: 0 }); + + destroy(); + batch((draft) => { + draft.a = 1; + }); + + expect(data.a).toBe(0); + }); }); describe('plugin error isolation', () => { @@ -1843,4 +2037,29 @@ describe('plugin error isolation', () => { expect(seen).toEqual(['value']); expect(reported).toEqual(['thrower:onChange']); }); + + it('should log through console.error by default when onPluginError is not provided', () => { + const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {}); + + const { data } = createSvState( + { value: 0 }, + {}, + { + plugins: [ + { + name: 'thrower', + onChange: () => { + throw new Error('boom'); + } + } + ] + } + ); + + data.value = 1; + + expect(consoleErrorSpy).toHaveBeenCalledWith('svstate: plugin "thrower" threw in onChange', expect.any(Error)); + + consoleErrorSpy.mockRestore(); + }); }); diff --git a/test/validators.test.ts b/test/validators.test.ts index 2906859..c4a439c 100644 --- a/test/validators.test.ts +++ b/test/validators.test.ts @@ -185,6 +185,13 @@ describe('stringValidator', () => { it('should fail for mixed case string', () => { expect(stringValidator('Hello').lowercase().getError()).toBe('Lowercase only'); }); + + it('should skip validation for nullish values', () => { + /* eslint-disable unicorn/no-null */ + expect(stringValidator(null).lowercase().getError()).toBe(''); + expect(stringValidator().lowercase().getError()).toBe(''); + /* eslint-enable unicorn/no-null */ + }); }); describe('startsWith', () => { @@ -207,6 +214,10 @@ describe('stringValidator', () => { it('should skip validation for empty string', () => { expect(stringValidator('').startsWith('hello').getError()).toBe(''); }); + + it('should keep the earlier error instead of overwriting it', () => { + expect(stringValidator('bye world').minLength(20).startsWith('hello').getError()).toBe('Min length 20'); + }); }); describe('regexp', () => { @@ -270,6 +281,10 @@ describe('stringValidator', () => { expect(stringValidator().in(['apple', 'banana']).getError()).toBe(''); /* eslint-enable unicorn/no-null */ }); + + it('should keep the earlier error instead of overwriting it', () => { + expect(stringValidator('orange').minLength(20).in(['apple', 'banana']).getError()).toBe('Min length 20'); + }); }); describe('notIn', () => { @@ -301,6 +316,10 @@ describe('stringValidator', () => { expect(stringValidator().notIn(['apple', 'banana']).getError()).toBe(''); /* eslint-enable unicorn/no-null */ }); + + it('should keep the earlier error instead of overwriting it', () => { + expect(stringValidator('apple').minLength(20).notIn(['apple', 'banana']).getError()).toBe('Min length 20'); + }); }); describe('email', () => { @@ -765,6 +784,14 @@ describe('numberValidator', () => { it('should fail for positive number', () => { expect(numberValidator(5).negative().getError()).toBe('Must be negative'); }); + + it('should skip validation for null/undefined/NaN', () => { + /* eslint-disable unicorn/no-null */ + expect(numberValidator(null).negative().getError()).toBe(''); + expect(numberValidator().negative().getError()).toBe(''); + /* eslint-enable unicorn/no-null */ + expect(numberValidator(NaN).negative().getError()).toBe(''); + }); }); describe('nonNegative', () => { @@ -779,6 +806,14 @@ describe('numberValidator', () => { it('should fail for negative number', () => { expect(numberValidator(-5).nonNegative().getError()).toBe('Must be non-negative'); }); + + it('should skip validation for null/undefined/NaN', () => { + /* eslint-disable unicorn/no-null */ + expect(numberValidator(null).nonNegative().getError()).toBe(''); + expect(numberValidator().nonNegative().getError()).toBe(''); + /* eslint-enable unicorn/no-null */ + expect(numberValidator(NaN).nonNegative().getError()).toBe(''); + }); }); describe('notZero', () => { @@ -1660,6 +1695,15 @@ describe('numberValidator precision', () => { it('should reject a zero divisor', () => { expect(numberValidator(5).multipleOf(0).getError()).toBe('Must be a multiple of 0'); }); + + it('should treat an unsafe integer with no decimal point as having zero decimal places', () => { + // Beyond Number.MAX_SAFE_INTEGER, isSafeInteger() is false but String() still has no '.' or 'e' + expect( + numberValidator(2 ** 60) + .decimal(2) + .getError() + ).toBe(''); + }); }); describe('arrayValidator comparison keys', () => { @@ -1701,4 +1745,34 @@ describe('arrayValidator comparison keys', () => { .getError() ).toBe('Must include 1'); }); + + it('should compare nested arrays by structure', () => { + expect( + arrayValidator([ + [1, 2], + [1, 2] + ]) + .unique() + .getError() + ).toBe('Items must be unique'); + expect( + arrayValidator([ + [1, 2], + [1, 3] + ]) + .unique() + .getError() + ).toBe(''); + }); + + it('should treat undefined entries inside nested structures as equal', () => { + expect( + arrayValidator([ + [1, undefined], + [1, undefined] + ]) + .unique() + .getError() + ).toBe('Items must be unique'); + }); }); From 3df004105217cd2760202bdf23358c93487a0cf8 Mon Sep 17 00:00:00 2001 From: BCsabaEngine Date: Thu, 20 Aug 2026 08:00:07 +0200 Subject: [PATCH 3/4] fix: demo --- demo/src/pages/ActionDemo.svelte | 2 +- demo/src/pages/ArrayProperty.svelte | 4 ++-- demo/src/pages/AsyncValidation.svelte | 8 +++---- demo/src/pages/OptionsDemo.svelte | 2 +- demo/src/pages/PluginPersistSync.svelte | 1 + demo/src/pages/ZodValidation.svelte | 2 +- .../{index-DofWQVW3.js => index-VyZcMzTz.js} | 23 ++++++++++--------- docs/index.html | 2 +- 8 files changed, 23 insertions(+), 21 deletions(-) rename docs/assets/{index-DofWQVW3.js => index-VyZcMzTz.js} (90%) diff --git a/demo/src/pages/ActionDemo.svelte b/demo/src/pages/ActionDemo.svelte index 47fbe11..054b858 100644 --- a/demo/src/pages/ActionDemo.svelte +++ b/demo/src/pages/ActionDemo.svelte @@ -65,7 +65,7 @@ createSvState(sourceData, { validator: (source) => ({ title: stringValidator(source.title).prepare('trim').required().minLength(3).maxLength(50).getError(), - description: stringValidator(source.description).prepare('trim').required().minLength(10).getError() + description: stringValidator(source.description).prepare('trim').required().minLength(10).maxLength(200).getError() }), action: async () => { // Simulate API call with 100-1000ms delay diff --git a/demo/src/pages/ArrayProperty.svelte b/demo/src/pages/ArrayProperty.svelte index bd7fff5..adaae50 100644 --- a/demo/src/pages/ArrayProperty.svelte +++ b/demo/src/pages/ArrayProperty.svelte @@ -96,10 +96,10 @@ type ItemErrors = Record; {#each data.items as item, index} - + - + {/each}`; diff --git a/demo/src/pages/AsyncValidation.svelte b/demo/src/pages/AsyncValidation.svelte index 7d6eb92..c73c1b3 100644 --- a/demo/src/pages/AsyncValidation.svelte +++ b/demo/src/pages/AsyncValidation.svelte @@ -103,12 +103,12 @@ // ───────────────────────────────────────────── // Source code examples for the collapsible section // ───────────────────────────────────────────── - const stateSourceCode = `const { data, batch, state: { errors, asyncErrors, asyncValidating, hasCombinedErrors } } = + const stateSourceCode = `const { data, batch, state: { errors, hasErrors, isDirty, asyncErrors, asyncValidating, hasCombinedErrors } } = createSvState(sourceData, { validator: (source) => ({ - username: stringValidator(source.username).required().minLength(3).noSpace().getError(), - email: stringValidator(source.email).required().email().getError(), - slug: stringValidator(source.slug).required().minLength(2).slug().getError() + username: stringValidator(source.username).prepare('trim').required().minLength(3).maxLength(20).noSpace().getError(), + email: stringValidator(source.email).prepare('trim').required().email().getError(), + slug: stringValidator(source.slug).prepare('trim').required().minLength(2).slug().getError() }), asyncValidator: { username: async (value, source, signal) => { diff --git a/demo/src/pages/OptionsDemo.svelte b/demo/src/pages/OptionsDemo.svelte index 20a951b..7446724 100644 --- a/demo/src/pages/OptionsDemo.svelte +++ b/demo/src/pages/OptionsDemo.svelte @@ -113,7 +113,7 @@ // ───────────────────────────────────────────── const optionsSourceCode = `const { data, execute, state } = createSvState( sourceData, - { validator, effect, action }, + { validator, effect, action, actionCompleted }, { // Reset isDirty to false after successful action resetDirtyOnAction: true, // default: true diff --git a/demo/src/pages/PluginPersistSync.svelte b/demo/src/pages/PluginPersistSync.svelte index 81e42d8..32ac1c1 100644 --- a/demo/src/pages/PluginPersistSync.svelte +++ b/demo/src/pages/PluginPersistSync.svelte @@ -109,6 +109,7 @@ batch((draft) => { draft.username = 'demo_user'; draft.theme = 'dark'; draft.fontSize = 16; + draft.notifications = false; });`; const apiSourceCode = `// persistPlugin API diff --git a/demo/src/pages/ZodValidation.svelte b/demo/src/pages/ZodValidation.svelte index 64d56f6..ad343ca 100644 --- a/demo/src/pages/ZodValidation.svelte +++ b/demo/src/pages/ZodValidation.svelte @@ -117,7 +117,7 @@ const userSchema = z.object({ ); } -const { data, batch, state: { errors, hasErrors } } = createSvState(sourceData, { +const { data, batch, state: { errors, hasErrors, isDirty, isDirtyByField } } = createSvState(sourceData, { validator: (source) => zodToSvstateErrors(userSchema, source, allFields) }); diff --git a/docs/assets/index-DofWQVW3.js b/docs/assets/index-VyZcMzTz.js similarity index 90% rename from docs/assets/index-DofWQVW3.js rename to docs/assets/index-VyZcMzTz.js index c8b9bb4..ae53114 100644 --- a/docs/assets/index-DofWQVW3.js +++ b/docs/assets/index-VyZcMzTz.js @@ -1,9 +1,9 @@ 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Effect triggered:
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`),Ho=U(`
Options

Reset isDirty after successful action

Try 500ms and type quickly

Keep errors until next action

Current Options
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svstate logo

svstate

A Svelte 5 library that provides a supercharged $state() with deep reactive proxies, validation, snapshot/undo, - and side effects — built for complex, real-world applications.

$ npm i svstate
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$ npm i svstate
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