overmind
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Frictionless state management
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{ PROXY_TREE } from 'proxy-state-tree'\n\nimport { EventType, Overmind, derived, IContext } from './'\n\ndescribe('Derived', () => {\n test('should instantiate app with derived state', () => {\n type State = {\n foo: string\n upperFoo: string\n }\n const state: State = {\n foo: 'bar',\n upperFoo: derived((state: State) => state.foo.toUpperCase()),\n }\n const config = {\n state,\n }\n\n const app = new Overmind(config)\n\n expect(app.state.upperFoo).toEqual('BAR')\n })\n\n test('should dynamically remove derived', async () => {\n let dirtyCount = 0\n const removeDerived = ({ state }: Context) => {\n state.upperFoo = null as any\n }\n const changeFoo = ({ state }: Context, count: number) => {\n state.foo = 'bar' + count\n }\n type State = {\n foo: string\n upperFoo: string\n }\n const state: State = {\n foo: 'bar',\n upperFoo: derived((state: State) => state.foo.toUpperCase()),\n }\n const actions = {\n changeFoo,\n removeDerived,\n }\n const config = {\n state,\n actions,\n }\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n\n const app = new Overmind(config)\n const trackStateTree = app.getTrackStateTree()\n const onTrack = () => {}\n function render() {\n trackStateTree.track(onTrack)\n app.state.upperFoo\n }\n app.eventHub.on(EventType.DERIVED_DIRTY, () => {\n dirtyCount++\n })\n render()\n expect(app.state.upperFoo).toBe('BAR')\n app.actions.changeFoo(2)\n expect(app.state.upperFoo).toBe('BAR2')\n app.actions.removeDerived()\n app.actions.changeFoo(3)\n // The dirty event is async\n await new Promise((resolve) => setTimeout(resolve, 0))\n expect(dirtyCount).toBe(1)\n })\n\n test('should dynamically add derived', () => {\n const addDerived = ({ state }: Context) => {\n state.upperFoo = derived((state: State) => state.foo.toUpperCase())\n }\n const changeFoo = ({ state }: Context) => {\n state.foo = 'bar2'\n }\n type State = {\n foo: string\n upperFoo: string | null\n }\n const state: State = {\n foo: 'bar',\n upperFoo: null,\n }\n const actions = {\n changeFoo,\n addDerived,\n }\n\n const config = {\n state,\n actions,\n }\n\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n\n const app = new Overmind(config)\n const trackStateTree = app.getTrackStateTree()\n const onTrack = () => {}\n function render() {\n trackStateTree.track(onTrack)\n app.state.upperFoo\n }\n render()\n app.actions.addDerived()\n expect(app.state.upperFoo).toBe('BAR')\n app.actions.changeFoo()\n expect(app.state.upperFoo).toBe('BAR2')\n })\n\n test('should allow access to proxy state tree to continue tracking with derived function', () => {\n let renderCount = 0\n const changeFoo = ({ state }: Context) => {\n state.foo = 'bar2'\n }\n type State = {\n foo: string\n upperFoo: () => string\n }\n const state: State = {\n foo: 'bar',\n upperFoo: derived(\n () =>\n function() {\n const state = this[PROXY_TREE].state\n\n return state.foo.toUpperCase()\n }\n ),\n }\n const actions = {\n changeFoo,\n }\n\n const config = {\n state,\n actions,\n }\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n\n const app = new Overmind(config)\n const trackStateTree = app.getTrackStateTree()\n const onTrack = () => {\n renderCount++\n }\n function render() {\n trackStateTree.track(onTrack)\n app.state.upperFoo()\n }\n render()\n app.actions.changeFoo()\n expect(renderCount).toBe(1)\n })\n\n test('should track derived state', () => {\n let renderCount = 0\n const changeFoo = ({ state }: Context) => {\n state.foo = 'bar2'\n }\n type State = {\n foo: string\n upperFoo: string\n }\n const state: State = {\n foo: 'bar',\n upperFoo: derived((state: State) => state.foo.toUpperCase()),\n }\n const actions = {\n changeFoo,\n }\n const config = {\n state,\n actions,\n }\n\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n\n const app = new Overmind(config)\n const trackStateTree = app.getTrackStateTree()\n const onTrack = () => {\n renderCount++\n }\n function render() {\n trackStateTree.track(onTrack)\n app.state.upperFoo\n }\n render()\n app.actions.changeFoo()\n expect(app.state.upperFoo).toBe('BAR2')\n expect(renderCount).toBe(1)\n })\n\n test('should not require flush to flag as dirty', () => {\n expect.assertions(1)\n type State = {\n foo: string\n upperFoo: string\n }\n const state: State = {\n foo: 'bar',\n upperFoo: derived((state: State) => state.foo.toUpperCase()),\n }\n const changeFoo = ({ state }: Context) => {\n state.foo = 'bar2'\n expect(state.upperFoo).toBe('BAR2')\n }\n const actions = {\n changeFoo,\n }\n const config = {\n state,\n actions,\n }\n\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n const app = new Overmind(config)\n\n app.actions.changeFoo()\n })\n test('should pass parent as second argument', () => {\n expect.assertions(1)\n const changeFoo = ({ state }: Context) => {\n state.foo = 'bar2'\n expect(state.upperFoo).toBe('BAR2')\n }\n\n type State = {\n foo: string\n upperFoo: string\n }\n\n const state: State = {\n foo: 'bar',\n upperFoo: derived((_, parent: State) => parent.foo.toUpperCase()),\n }\n const actions = {\n changeFoo,\n }\n const config = {\n state,\n actions,\n }\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n const app = new Overmind(config)\n\n app.actions.changeFoo()\n })\n test('should track nested derived correctly', () => {\n expect.assertions(4)\n let runCount = 0\n const changeFoo = ({ state }: Context) => {\n state.nestedDerived.foo = 'bar2'\n expect(state.nestedDerived.upperFoo).toBe('BAR2')\n }\n\n type State = {\n nestedDerived: {\n foo: string\n upperFoo: string\n }\n }\n\n const state: State = {\n nestedDerived: {\n foo: 'bar',\n upperFoo: derived((parent: State['nestedDerived']) =>\n parent.foo.toUpperCase()\n ),\n },\n }\n const actions = {\n changeFoo,\n }\n const config = {\n state,\n actions,\n }\n type Context = IContext<{\n state: typeof state\n actions: typeof actions\n }>\n const app = new Overmind(config)\n\n const trackStateTree = app.getTrackStateTree()\n\n function render() {\n runCount++\n if (runCount === 1) {\n expect(trackStateTree.state.nestedDerived.upperFoo).toBe('BAR')\n } else {\n expect(trackStateTree.state.nestedDerived.upperFoo).toBe('BAR2')\n }\n trackStateTree.stopTracking()\n }\n\n trackStateTree.track(render)\n\n render()\n\n app.actions.changeFoo()\n\n expect(runCount).toBe(2)\n })\n test('should be able to add derived to class instances', () => {\n class SomeClass {\n foo = derived((state: SomeClass) => state.bar + '!')\n bar = 'foo'\n }\n type State = {\n class: SomeClass\n }\n const state: State = {\n class: new SomeClass(),\n }\n const config = {\n state,\n }\n\n const app = new Overmind(config)\n\n expect(app.state.class.foo).toEqual('foo!')\n })\n})\n"]}