adding docs subtree

docs/step2-03/README.md

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+# Step 2.3: Theming and Styling
+
+[Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
+
+Theming and Styling with UI Fabric. In this section, we will illustrate how to utilize some of the built-in theming and styling features right inside UI Fabric component library. UI Fabric exposes its own css-in-js library called `mergeStyles` that is very performant compared with other similar libraries.
+
+A CodePen that illustrates what `mergeStyles` does: https://codepen.io/dzearing/pen/jGdgrE?editors=1011
+
+There are three areas that we should focus on in this step:
+
+1. Theming with Fabric using `<Customizer>` component
+2. Customizing themes and loading with `loadTheme()`
+3. CSS-in-JS with mergeStyles
+4. Customizing Fabric Components `styles` prop
+
+## 1. Theming with Fabric
+
+- Fabric applies themes by propagating the theme down the children through the React Context mechanism
+- It is applied with the `<Customizer>` component
+- There are some predefined themes within Fabric already, like Fluent (which will become the default in the next major), MDL2, Azure, and some other sample themes like Teams.
+- Take a look at `demo/src/components/TodoApp.tsx`
+
+## 2. Customizing Fabric Themes
+
+- Use the `loadTheme()` function to load a theme (applies to entire application):
+- Erase the `<Customizer>` inside the `TodoApp.tsx` and place this code in the module scope. This will initialize a theme to be used throughout the application
+- Fabric website has a handy theme generator to get you started with a theme: https://developer.microsoft.com/en-us/fabric#/styles/themegenerator
+
+```ts
+import { loadTheme } from 'office-ui-fabric-react';
+
+loadTheme({
+  palette: {
+    themePrimary: '#0078d4',
+    themeLighterAlt: '#eff6fc',
+    themeLighter: '#deecf9',
+    themeLight: '#c7e0f4',
+    themeTertiary: '#71afe5',
+    themeSecondary: '#2b88d8',
+    themeDarkAlt: '#106ebe',
+    themeDark: '#005a9e',
+    themeDarker: '#004578',
+    neutralLighterAlt: '#f8f8f8',
+    neutralLighter: '#f4f4f4',
+    neutralLight: '#eaeaea',
+    neutralQuaternaryAlt: '#dadada',
+    neutralQuaternary: '#d0d0d0',
+    neutralTertiaryAlt: '#c8c8c8',
+    neutralTertiary: '#c2c2c2',
+    neutralSecondary: '#858585',
+    neutralPrimaryAlt: '#4b4b4b',
+    neutralPrimary: '#333333',
+    neutralDark: '#272727',
+    black: '#1d1d1d',
+    white: '#ffffff'
+  }
+});
+```
+
+## 3. CSS-in-JS with mergeStyles
+
+- `mergeStyles` is a styling library that creates CSS class from styles that are expressed in JS
+- These classes can be passed into `className` prop of any component like `<div>`
+- This library replaces the need to import CSS stylesheets because they are bundled as normal JS code
+- Take a look at `demo/src/components/TodoApp.tsx`
+
+## 4. Customizing Fabric Controls
+
+- calling `mergeStyles` is time consuming and very static
+- Fabric components expose a `styles` prop (not to be confused with the React built-in one called `style`)
+- You can use intellisense to discover which parts of the component you can to customize
+- You can even use a style function to change the style based on some style prop
+- Take a look at these customizations in `demo/src/components/TodoHeader.tsx`
+
+# Exercises
+
+## Themes - Using Predefined Theme
+
+Apply some included and predefined themes from the UI Fabric package inside the `/step2-03/exercise/src/components/TodoApp.tsx`. Do this by replacing:
+
+```ts
+import { FluentCustomizations } from '@uifabric/fluent-theme';
+```
+
+with:
+
+```ts
+import { TeamsCustomizations } from '@uifabric/theme-samples';
+```
+
+## Themes - Customized Theme
+
+Create your own theme and apply the color palette here:
+https://developer.microsoft.com/en-us/fabric#/styles/themegenerator
+
+1. Delete the `Customizer` component
+
+2. Paste in this code in the `TodoApp.tsx` before the `TodoApp` component definition
+
+3. Play around with the values and use intellisense to discover the `ITheme` type within VS Code
+
+## CSS in JS with MergeStyles
+
+The styling library name is glamorous nor does it bring about emotion, but it is very quick and lightweight. `MergeStyles` turns CSS Rules into CSS class names to be applied to the components.
+
+1. Try applying a merged style `className` as a prop inside `TodoApp`
+
+```tsx
+import { mergeStyles } from 'office-ui-fabric-react';
+
+const className = mergeStyles({
+  backgroundColor: 'red',
+  selectors: {
+    ':hover': {
+      backgroundColor: 'blue'
+    }
+  }
+});
+```
+
+2. Try to give a few components extra padding
+
+## Customize the Fabric Components
+
+1. Open `exercise/src/components/TodoFooter.tsx`
+
+2. Find the `<DefaultButton>` and insert a `styles` prop
+
+3. Try to customize this with a styles object (let the Intellisense of VS Code guide you on what you can use to customize)
+
+4. Try to customize this with a styles function

docs/step2-03/demo/index.html

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+<!doctype html><html><head><link rel="stylesheet" href="../../assets/step.css"></head><body class="ms-Fabric"><div id="markdownReadme"></div><div id="app"></div><script src="../../step2-03/demo/step2-03/demo.js"></script><script src="../../markdownReadme/markdownReadme.js"></script></body></html>

docs/step2-03/demo/src/components/TodoApp.tsx

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+import React from 'react';
+import { Stack, Customizer, mergeStyles, getTheme } from 'office-ui-fabric-react';
+import { TodoFooter } from './TodoFooter';
+import { TodoHeader } from './TodoHeader';
+import { TodoList } from './TodoList';
+import { Store } from '../store';
+import { FluentCustomizations } from '@uifabric/fluent-theme';
+
+let index = 0;
+
+const className = mergeStyles({
+  padding: 25,
+  ...getTheme().effects.elevation4
+});
+
+export class TodoApp extends React.Component<any, Store> {
+  constructor(props) {
+    super(props);
+    this.state = {
+      todos: {},
+      filter: 'all'
+    };
+  }
+  render() {
+    const { filter, todos } = this.state;
+    return (
+      <Customizer {...FluentCustomizations}>
+        <Stack horizontalAlign="center">
+          <Stack style={{ width: 400 }} gap={25} className={className}>
+            <TodoHeader addTodo={this._addTodo} setFilter={this._setFilter} filter={filter} />
+            <TodoList complete={this._complete} todos={todos} filter={filter} remove={this._remove} edit={this._edit} />
+            <TodoFooter clear={this._clear} todos={todos} />
+          </Stack>
+        </Stack>
+      </Customizer>
+    );
+  }
+
+  private _addTodo = label => {
+    const { todos } = this.state;
+    const id = index++;
+
+    this.setState({
+      todos: { ...todos, [id]: { label } }
+    });
+  };
+
+  private _remove = id => {
+    const newTodos = { ...this.state.todos };
+    delete newTodos[id];
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _complete = id => {
+    const newTodos = { ...this.state.todos };
+    newTodos[id].completed = !newTodos[id].completed;
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _edit = (id, label) => {
+    const newTodos = { ...this.state.todos };
+    newTodos[id] = { ...newTodos[id], label };
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _clear = () => {
+    const { todos } = this.state;
+    const newTodos = {};
+
+    Object.keys(this.state.todos).forEach(id => {
+      if (!todos[id].completed) {
+        newTodos[id] = todos[id];
+      }
+    });
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _setFilter = filter => {
+    this.setState({
+      filter: filter
+    });
+  };
+}

docs/step2-03/demo/src/components/TodoFooter.tsx

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+import React from 'react';
+import { Text } from '@uifabric/experiments';
+import { Stack } from 'office-ui-fabric-react';
+import { Store } from '../store';
+import { DefaultButton } from 'office-ui-fabric-react';
+
+interface TodoFooterProps {
+  clear: () => void;
+  todos: Store['todos'];
+}
+
+export const TodoFooter = (props: TodoFooterProps) => {
+  const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
+
+  return (
+    <Stack horizontal horizontalAlign="space-between">
+      <Text>
+        {itemCount} item{itemCount > 1 ? 's' : ''} left
+      </Text>
+      <DefaultButton onClick={() => props.clear()}>Clear Completed</DefaultButton>
+    </Stack>
+  );
+};

docs/step2-03/demo/src/components/TodoHeader.tsx

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+import React from 'react';
+import { Text } from '@uifabric/experiments';
+import { Stack } from 'office-ui-fabric-react';
+import { Pivot, PivotItem, TextField, PrimaryButton } from 'office-ui-fabric-react';
+import { FilterTypes } from '../store';
+
+interface TodoHeaderProps {
+  addTodo: (label: string) => void;
+  setFilter: (filter: FilterTypes) => void;
+  filter: FilterTypes;
+}
+
+interface TodoHeaderState {
+  labelInput: string;
+}
+
+export class TodoHeader extends React.Component<TodoHeaderProps, TodoHeaderState> {
+  constructor(props: TodoHeaderProps) {
+    super(props);
+    this.state = { labelInput: undefined };
+  }
+
+  render() {
+    return (
+      <Stack gap={10}>
+        <Stack horizontal horizontalAlign="center">
+          <Text variant="xxLarge">todos</Text>
+        </Stack>
+
+        <Stack horizontal gap={10}>
+          <Stack.Item grow>
+            <TextField
+              placeholder="What needs to be done?"
+              value={this.state.labelInput}
+              onChange={this.onChange}
+              styles={props => ({
+                ...(props.focused && {
+                  field: {
+                    backgroundColor: 'black'
+                  }
+                })
+              })}
+            />
+          </Stack.Item>
+          <PrimaryButton onClick={this.onAdd} styles={{ root: { backgroundColor: 'maroon' }, rootHovered: { background: 'green' } }}>
+            Add
+          </PrimaryButton>
+        </Stack>
+
+        <Pivot onLinkClick={this.onFilter}>
+          <PivotItem headerText="all" />
+          <PivotItem headerText="active" />
+          <PivotItem headerText="completed" />
+        </Pivot>
+      </Stack>
+    );
+  }
+
+  private onAdd = () => {
+    this.props.addTodo(this.state.labelInput);
+    this.setState({ labelInput: undefined });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ labelInput: newValue });
+  };
+
+  private onFilter = (item: PivotItem) => {
+    this.props.setFilter(item.props.headerText as FilterTypes);
+  };
+}

docs/step2-03/demo/src/components/TodoList.tsx

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+import React from 'react';
+import { Stack } from 'office-ui-fabric-react';
+import { TodoListItem } from './TodoListItem';
+import { Store, FilterTypes } from '../store';
+
+interface TodoListProps {
+  complete: (id: string) => void;
+  remove: (id: string) => void;
+  todos: Store['todos'];
+  filter: FilterTypes;
+  edit: (id: string, label: string) => void;
+}
+
+export const TodoList = (props: TodoListProps) => {
+  const { filter, todos, complete, remove, edit } = props;
+  const filteredTodos = Object.keys(todos).filter(id => {
+    return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
+  });
+
+  return (
+    <Stack gap={10}>
+      {filteredTodos.map(id => (
+        <TodoListItem key={id} id={id} todos={todos} complete={complete} remove={remove} edit={edit} />
+      ))}
+    </Stack>
+  );
+};

docs/step2-03/demo/src/components/TodoListItem.tsx

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+import React from 'react';
+import { Stack, Checkbox, IconButton, TextField, DefaultButton } from 'office-ui-fabric-react';
+import { Store } from '../store';
+
+interface TodoListItemProps {
+  id: string;
+  todos: Store['todos'];
+  remove: (id: string) => void;
+  complete: (id: string) => void;
+  edit: (id: string, label: string) => void;
+}
+
+interface TodoListItemState {
+  editing: boolean;
+  editLabel: string;
+}
+
+export class TodoListItem extends React.Component<TodoListItemProps, TodoListItemState> {
+  constructor(props: TodoListItemProps) {
+    super(props);
+    this.state = { editing: false, editLabel: undefined };
+  }
+
+  render() {
+    const { todos, id, complete, remove } = this.props;
+    const item = todos[id];
+
+    return (
+      <Stack horizontal verticalAlign="center" horizontalAlign="space-between">
+        {!this.state.editing && (
+          <>
+            <Checkbox label={item.label} checked={item.completed} onChange={() => complete(id)} />
+            <div>
+              <IconButton iconProps={{ iconName: 'Edit' }} onClick={this.onEdit} />
+              <IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => remove(id)} />
+            </div>
+          </>
+        )}
+
+        {this.state.editing && (
+          <Stack.Item grow>
+            <Stack horizontal gap={10}>
+              <Stack.Item grow>
+                <TextField value={this.state.editLabel} onChange={this.onChange} />
+              </Stack.Item>
+              <DefaultButton onClick={this.onDoneEdit}>Save</DefaultButton>
+            </Stack>
+          </Stack.Item>
+        )}
+      </Stack>
+    );
+  }
+
+  private onEdit = () => {
+    const { todos, id } = this.props;
+    const { label } = todos[id];
+
+    this.setState({
+      editing: true,
+      editLabel: this.state.editLabel || label
+    });
+  };
+
+  private onDoneEdit = () => {
+    this.props.edit(this.props.id, this.state.editLabel);
+    this.setState({
+      editing: false,
+      editLabel: undefined
+    });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ editLabel: newValue });
+  };
+}

docs/step2-03/demo/src/index.tsx

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import { TodoApp } from './components/TodoApp';
+import { initializeIcons } from '@uifabric/icons';
+
+// Initializes the UI Fabric icons that we can use
+// Choose one from this list: https://developer.microsoft.com/en-us/fabric#/styles/icons
+initializeIcons();
+
+ReactDOM.render(<TodoApp />, document.getElementById('app'));

docs/step2-03/demo/src/store/index.ts

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+export type FilterTypes = 'all' | 'active' | 'completed';
+
+export interface TodoItem {
+  label: string;
+  completed: boolean;
+}
+
+export interface Store {
+  todos: {
+    [id: string]: TodoItem;
+  };
+
+  filter: FilterTypes;
+}

docs/step2-03/exercise/index.html

@@ -0,0 +1 @@
+<!doctype html><html><head><link rel="stylesheet" href="../../assets/step.css"></head><body class="ms-Fabric"><div id="markdownReadme"></div><div id="app"></div><script src="../../step2-03/exercise/step2-03/exercise.js"></script><script src="../../markdownReadme/markdownReadme.js"></script></body></html>

docs/step2-03/exercise/src/components/TodoApp.tsx

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+import React from 'react';
+import { Stack, Customizer, mergeStyles, getTheme } from 'office-ui-fabric-react';
+import { TodoFooter } from './TodoFooter';
+import { TodoHeader } from './TodoHeader';
+import { TodoList } from './TodoList';
+import { Store } from '../store';
+
+// TODO: Change me to another theme!
+import { TeamsCustomizations } from '@uifabric/theme-samples';
+
+let index = 0;
+
+// TODO: Change this to add other CSS styles like backgroundColor, fontSize, etc
+const className = mergeStyles({
+  padding: 25,
+  ...getTheme().effects.elevation4
+});
+
+export class TodoApp extends React.Component<any, Store> {
+  constructor(props) {
+    super(props);
+    this.state = {
+      todos: {},
+      filter: 'all'
+    };
+  }
+  render() {
+    const { filter, todos } = this.state;
+    return (
+      <Customizer {...TeamsCustomizations}>
+        <Stack horizontalAlign="center">
+          <Stack style={{ width: 400 }} gap={25} className={className}>
+            <TodoHeader addTodo={this._addTodo} setFilter={this._setFilter} filter={filter} />
+            <TodoList complete={this._complete} todos={todos} filter={filter} remove={this._remove} edit={this._edit} />
+            <TodoFooter clear={this._clear} todos={todos} />
+          </Stack>
+        </Stack>
+      </Customizer>
+    );
+  }
+
+  private _addTodo = label => {
+    const { todos } = this.state;
+    const id = index++;
+
+    this.setState({
+      todos: { ...todos, [id]: { label } }
+    });
+  };
+
+  private _remove = id => {
+    const newTodos = { ...this.state.todos };
+    delete newTodos[id];
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _complete = id => {
+    const newTodos = { ...this.state.todos };
+    newTodos[id].completed = !newTodos[id].completed;
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _edit = (id, label) => {
+    const newTodos = { ...this.state.todos };
+    newTodos[id] = { ...newTodos[id], label };
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _clear = () => {
+    const { todos } = this.state;
+    const newTodos = {};
+
+    Object.keys(this.state.todos).forEach(id => {
+      if (!todos[id].completed) {
+        newTodos[id] = todos[id];
+      }
+    });
+
+    this.setState({
+      todos: newTodos
+    });
+  };
+
+  private _setFilter = filter => {
+    this.setState({
+      filter: filter
+    });
+  };
+}

docs/step2-03/exercise/src/components/TodoFooter.tsx

@@ -0,0 +1,26 @@
+import React from 'react';
+import { Text } from '@uifabric/experiments';
+import { Stack } from 'office-ui-fabric-react';
+import { Store } from '../store';
+import { DefaultButton } from 'office-ui-fabric-react';
+
+interface TodoFooterProps {
+  clear: () => void;
+  todos: Store['todos'];
+}
+
+export const TodoFooter = (props: TodoFooterProps) => {
+  const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
+
+  // TODO: play around with the DefaultButton component below with a "styles" prop
+  // - try it with an object: styles={{ ... }}
+  // - try it with a function: styles={props => ({ ... })}
+  return (
+    <Stack horizontal horizontalAlign="space-between">
+      <Text>
+        {itemCount} item{itemCount > 1 ? 's' : ''} left
+      </Text>
+      <DefaultButton onClick={() => props.clear()}>Clear Completed</DefaultButton>
+    </Stack>
+  );
+};

docs/step2-03/exercise/src/components/TodoHeader.tsx

@@ -0,0 +1,58 @@
+import React from 'react';
+import { Text } from '@uifabric/experiments';
+import { Stack } from 'office-ui-fabric-react';
+import { Pivot, PivotItem, TextField, PrimaryButton } from 'office-ui-fabric-react';
+import { FilterTypes } from '../store';
+
+interface TodoHeaderProps {
+  addTodo: (label: string) => void;
+  setFilter: (filter: FilterTypes) => void;
+  filter: FilterTypes;
+}
+
+interface TodoHeaderState {
+  labelInput: string;
+}
+
+export class TodoHeader extends React.Component<TodoHeaderProps, TodoHeaderState> {
+  constructor(props: TodoHeaderProps) {
+    super(props);
+    this.state = { labelInput: undefined };
+  }
+
+  render() {
+    return (
+      <Stack gap={10}>
+        <Stack horizontal horizontalAlign="center">
+          <Text variant="xxLarge">todos</Text>
+        </Stack>
+
+        <Stack horizontal gap={10}>
+          <Stack.Item grow>
+            <TextField placeholder="What needs to be done?" value={this.state.labelInput} onChange={this.onChange} />
+          </Stack.Item>
+          <PrimaryButton onClick={this.onAdd}>Add</PrimaryButton>
+        </Stack>
+
+        <Pivot onLinkClick={this.onFilter}>
+          <PivotItem headerText="all" />
+          <PivotItem headerText="active" />
+          <PivotItem headerText="completed" />
+        </Pivot>
+      </Stack>
+    );
+  }
+
+  private onAdd = () => {
+    this.props.addTodo(this.state.labelInput);
+    this.setState({ labelInput: undefined });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ labelInput: newValue });
+  };
+
+  private onFilter = (item: PivotItem) => {
+    this.props.setFilter(item.props.headerText as FilterTypes);
+  };
+}

docs/step2-03/exercise/src/components/TodoList.tsx

@@ -0,0 +1,27 @@
+import React from 'react';
+import { Stack } from 'office-ui-fabric-react';
+import { TodoListItem } from './TodoListItem';
+import { Store, FilterTypes } from '../store';
+
+interface TodoListProps {
+  complete: (id: string) => void;
+  remove: (id: string) => void;
+  todos: Store['todos'];
+  filter: FilterTypes;
+  edit: (id: string, label: string) => void;
+}
+
+export const TodoList = (props: TodoListProps) => {
+  const { filter, todos, complete, remove, edit } = props;
+  const filteredTodos = Object.keys(todos).filter(id => {
+    return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
+  });
+
+  return (
+    <Stack gap={10}>
+      {filteredTodos.map(id => (
+        <TodoListItem key={id} id={id} todos={todos} complete={complete} remove={remove} edit={edit} />
+      ))}
+    </Stack>
+  );
+};

docs/step2-03/exercise/src/components/TodoListItem.tsx

@@ -0,0 +1,75 @@
+import React from 'react';
+import { Stack, Checkbox, IconButton, TextField, DefaultButton } from 'office-ui-fabric-react';
+import { Store } from '../store';
+
+interface TodoListItemProps {
+  id: string;
+  todos: Store['todos'];
+  remove: (id: string) => void;
+  complete: (id: string) => void;
+  edit: (id: string, label: string) => void;
+}
+
+interface TodoListItemState {
+  editing: boolean;
+  editLabel: string;
+}
+
+export class TodoListItem extends React.Component<TodoListItemProps, TodoListItemState> {
+  constructor(props: TodoListItemProps) {
+    super(props);
+    this.state = { editing: false, editLabel: undefined };
+  }
+
+  render() {
+    const { todos, id, complete, remove } = this.props;
+    const item = todos[id];
+
+    return (
+      <Stack horizontal verticalAlign="center" horizontalAlign="space-between">
+        {!this.state.editing && (
+          <>
+            <Checkbox label={item.label} checked={item.completed} onChange={() => complete(id)} />
+            <div>
+              <IconButton iconProps={{ iconName: 'Edit' }} onClick={this.onEdit} />
+              <IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => remove(id)} />
+            </div>
+          </>
+        )}
+
+        {this.state.editing && (
+          <Stack.Item grow>
+            <Stack horizontal gap={10}>
+              <Stack.Item grow>
+                <TextField value={this.state.editLabel} onChange={this.onChange} />
+              </Stack.Item>
+              <DefaultButton onClick={this.onDoneEdit}>Save</DefaultButton>
+            </Stack>
+          </Stack.Item>
+        )}
+      </Stack>
+    );
+  }
+
+  private onEdit = () => {
+    const { todos, id } = this.props;
+    const { label } = todos[id];
+
+    this.setState({
+      editing: true,
+      editLabel: this.state.editLabel || label
+    });
+  };
+
+  private onDoneEdit = () => {
+    this.props.edit(this.props.id, this.state.editLabel);
+    this.setState({
+      editing: false,
+      editLabel: undefined
+    });
+  };
+
+  private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
+    this.setState({ editLabel: newValue });
+  };
+}

docs/step2-03/exercise/src/index.tsx

@@ -0,0 +1,10 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import { TodoApp } from './components/TodoApp';
+import { initializeIcons } from '@uifabric/icons';
+
+// Initializes the UI Fabric icons that we can use
+// Choose one from this list: https://developer.microsoft.com/en-us/fabric#/styles/icons
+initializeIcons();
+
+ReactDOM.render(<TodoApp />, document.getElementById('app'));

docs/step2-03/exercise/src/store/index.ts

@@ -0,0 +1,14 @@
+export type FilterTypes = 'all' | 'active' | 'completed';
+
+export interface TodoItem {
+  label: string;
+  completed: boolean;
+}
+
+export interface Store {
+  todos: {
+    [id: string]: TodoItem;
+  };
+
+  filter: FilterTypes;
+}