Add prettier config, lint (#39)

* Add prettier, lint index

* lint all files

* lint test file

__tests__/index.test.tsx

@@ -1,200 +1,223 @@
-import {act, render, screen} from "@testing-library/react";
-import {ThemeProvider, useTheme} from "../index";
-import React, {useEffect} from "react";
+import { act, render, screen } from '@testing-library/react'
+import { ThemeProvider, useTheme } from '../index'
+import React, { useEffect } from 'react'
 
 let localStorageMock: { [key: string]: string } = {}
 
 // HelperComponent to render the theme inside a paragraph-tag and setting a theme via the forceSetTheme prop
-const HelperComponent = ({forceSetTheme}: { forceSetTheme?: string }) => {
-    const {setTheme, theme, forcedTheme} = useTheme()
-
-    useEffect(() => {
-        if (forceSetTheme) {
-            setTheme(forceSetTheme)
-        }
-    }, [forceSetTheme])
-
-    return <>
-        <p data-testid="theme">{theme}</p>
-        <p data-testid="forcedTheme">{forcedTheme}</p>
-    </>;
+const HelperComponent = ({ forceSetTheme }: { forceSetTheme?: string }) => {
+  const { setTheme, theme, forcedTheme } = useTheme()
+
+  useEffect(() => {
+    if (forceSetTheme) {
+      setTheme(forceSetTheme)
+    }
+  }, [forceSetTheme])
+
+  return (
+    <>
+      <p data-testid="theme">{theme}</p>
+      <p data-testid="forcedTheme">{forcedTheme}</p>
+    </>
+  )
 }
 
 beforeAll(() => {
-    // Create a mock of the window.matchMedia function
-    // Based on: https://stackoverflow.com/questions/39830580/jest-test-fails-typeerror-window-matchmedia-is-not-a-function
-    Object.defineProperty(window, 'matchMedia', {
-        writable: true,
-        value: jest.fn().mockImplementation(query => ({
-            matches: false,
-            media: query,
-            onchange: null,
-            addListener: jest.fn(), // Deprecated
-            removeListener: jest.fn(), // Deprecated
-            addEventListener: jest.fn(),
-            removeEventListener: jest.fn(),
-            dispatchEvent: jest.fn(),
-        })),
-    })
-
-    // Create mocks of localStorage getItem and setItem functions
-    global.Storage.prototype.getItem = jest.fn((key: string) => localStorageMock[key])
-    global.Storage.prototype.setItem = jest.fn((key: string, value: string) => {
-        localStorageMock[key] = value;
-    })
+  // Create a mock of the window.matchMedia function
+  // Based on: https://stackoverflow.com/questions/39830580/jest-test-fails-typeerror-window-matchmedia-is-not-a-function
+  Object.defineProperty(window, 'matchMedia', {
+    writable: true,
+    value: jest.fn().mockImplementation(query => ({
+      matches: false,
+      media: query,
+      onchange: null,
+      addListener: jest.fn(), // Deprecated
+      removeListener: jest.fn(), // Deprecated
+      addEventListener: jest.fn(),
+      removeEventListener: jest.fn(),
+      dispatchEvent: jest.fn()
+    }))
+  })
+
+  // Create mocks of localStorage getItem and setItem functions
+  global.Storage.prototype.getItem = jest.fn(
+    (key: string) => localStorageMock[key]
+  )
+  global.Storage.prototype.setItem = jest.fn((key: string, value: string) => {
+    localStorageMock[key] = value
+  })
 })
 
 beforeEach(() => {
-    // Clear the localStorage-mock
-    localStorageMock = {}
+  // Clear the localStorage-mock
+  localStorageMock = {}
 })
 
 describe('defaultTheme test-suite', () => {
-
-    test('should return system when no default-theme is set', () => {
-        render(
-            <ThemeProvider>
-                <HelperComponent/>
-            </ThemeProvider>
-        )
-
-        expect(screen.getByTestId('theme').textContent).toBe('system')
-    })
-
-    test('should return light when no default-theme is set and enableSystem=false', () => {
-        render(
-            <ThemeProvider enableSystem={false}>
-                <HelperComponent/>
-            </ThemeProvider>
-        )
-
-        expect(screen.getByTestId('theme').textContent).toBe('light')
-    })
-
-    test('should return light when light is set as default-theme', () => {
-        render(
-            <ThemeProvider defaultTheme="light">
-                <HelperComponent/>
-            </ThemeProvider>
-        )
-
-        expect(screen.getByTestId('theme').textContent).toBe('light')
-    })
-
-    test('should return dark when dark is set as default-theme', () => {
-        render(
-            <ThemeProvider defaultTheme="dark">
-                <HelperComponent/>
-            </ThemeProvider>
-        )
-
-        expect(screen.getByTestId('theme').textContent).toBe('dark')
-    })
-});
+  test('should return system when no default-theme is set', () => {
+    render(
+      <ThemeProvider>
+        <HelperComponent />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme').textContent).toBe('system')
+  })
+
+  test('should return light when no default-theme is set and enableSystem=false', () => {
+    render(
+      <ThemeProvider enableSystem={false}>
+        <HelperComponent />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme').textContent).toBe('light')
+  })
+
+  test('should return light when light is set as default-theme', () => {
+    render(
+      <ThemeProvider defaultTheme="light">
+        <HelperComponent />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme').textContent).toBe('light')
+  })
+
+  test('should return dark when dark is set as default-theme', () => {
+    render(
+      <ThemeProvider defaultTheme="dark">
+        <HelperComponent />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme').textContent).toBe('dark')
+  })
+})
 
 describe('custom storageKey test-suite', () => {
-
-    test('should save to localStorage with \'theme\' key when using default settings', () => {
-        act(() => {
-            render(<ThemeProvider>
-                <HelperComponent forceSetTheme="light"/>
-            </ThemeProvider>)
-        })
-
-        expect(global.Storage.prototype.getItem).toHaveBeenCalledWith('theme')
-        expect(global.Storage.prototype.setItem).toHaveBeenCalledWith('theme', 'light')
+  test("should save to localStorage with 'theme' key when using default settings", () => {
+    act(() => {
+      render(
+        <ThemeProvider>
+          <HelperComponent forceSetTheme="light" />
+        </ThemeProvider>
+      )
     })
 
-    test('should save to localStorage with \'custom\' when setting prop \'storageKey\' to \'customKey\'', () => {
-        act(() => {
-            render(<ThemeProvider storageKey="customKey">
-                <HelperComponent forceSetTheme="light"/>
-            </ThemeProvider>)
-        })
-
-        expect(global.Storage.prototype.getItem).toHaveBeenCalledWith('customKey')
-        expect(global.Storage.prototype.setItem).toHaveBeenCalledWith('customKey', 'light')
+    expect(global.Storage.prototype.getItem).toHaveBeenCalledWith('theme')
+    expect(global.Storage.prototype.setItem).toHaveBeenCalledWith(
+      'theme',
+      'light'
+    )
+  })
+
+  test("should save to localStorage with 'custom' when setting prop 'storageKey' to 'customKey'", () => {
+    act(() => {
+      render(
+        <ThemeProvider storageKey="customKey">
+          <HelperComponent forceSetTheme="light" />
+        </ThemeProvider>
+      )
     })
 
+    expect(global.Storage.prototype.getItem).toHaveBeenCalledWith('customKey')
+    expect(global.Storage.prototype.setItem).toHaveBeenCalledWith(
+      'customKey',
+      'light'
+    )
+  })
 })
 
 describe('custom attribute test-suite', () => {
-
-    test('should use data-theme attribute when using default', () => {
-        act(() => {
-            render(<ThemeProvider>
-                <HelperComponent forceSetTheme="light"/>
-            </ThemeProvider>)
-        })
-
-        expect(document.documentElement.getAttribute("data-theme")).toBe("light")
+  test('should use data-theme attribute when using default', () => {
+    act(() => {
+      render(
+        <ThemeProvider>
+          <HelperComponent forceSetTheme="light" />
+        </ThemeProvider>
+      )
     })
 
-    test('should use class attribute (CSS-class) when attribute="class"', () => {
-        act(() => {
-            render(<ThemeProvider attribute="class">
-                <HelperComponent forceSetTheme="light"/>
-            </ThemeProvider>)
-        })
+    expect(document.documentElement.getAttribute('data-theme')).toBe('light')
+  })
 
-        expect(document.documentElement.classList.contains("light")).toBeTruthy()
-    });
+  test('should use class attribute (CSS-class) when attribute="class"', () => {
+    act(() => {
+      render(
+        <ThemeProvider attribute="class">
+          <HelperComponent forceSetTheme="light" />
+        </ThemeProvider>
+      )
+    })
 
-    test('should use "data-example"-attribute when attribute="data-example"', () => {
-        act(() => {
-            render(<ThemeProvider attribute="data-example">
-                <HelperComponent forceSetTheme="light"/>
-            </ThemeProvider>)
-        })
+    expect(document.documentElement.classList.contains('light')).toBeTruthy()
+  })
 
-        expect(document.documentElement.getAttribute('data-example')).toBe('light')
+  test('should use "data-example"-attribute when attribute="data-example"', () => {
+    act(() => {
+      render(
+        <ThemeProvider attribute="data-example">
+          <HelperComponent forceSetTheme="light" />
+        </ThemeProvider>
+      )
     })
 
+    expect(document.documentElement.getAttribute('data-example')).toBe('light')
+  })
 })
 
 describe('custom value-mapping test-suite', () => {
-
-    test('should use custom value mapping when using value={{pink:"my-pink-theme"}}', () => {
-        localStorageMock["theme"] = "pink"
-
-        act(() => {
-            render(<ThemeProvider themes={['pink', 'light', 'dark', 'system']} value={{pink: "my-pink-theme"}}>
-                <HelperComponent forceSetTheme="pink"/>
-            </ThemeProvider>)
-        })
-
-        expect(document.documentElement.getAttribute('data-theme')).toBe('my-pink-theme')
-        expect(global.Storage.prototype.setItem).toHaveBeenCalledWith('theme', 'pink')
+  test('should use custom value mapping when using value={{pink:"my-pink-theme"}}', () => {
+    localStorageMock['theme'] = 'pink'
+
+    act(() => {
+      render(
+        <ThemeProvider
+          themes={['pink', 'light', 'dark', 'system']}
+          value={{ pink: 'my-pink-theme' }}
+        >
+          <HelperComponent forceSetTheme="pink" />
+        </ThemeProvider>
+      )
     })
 
+    expect(document.documentElement.getAttribute('data-theme')).toBe(
+      'my-pink-theme'
+    )
+    expect(global.Storage.prototype.setItem).toHaveBeenCalledWith(
+      'theme',
+      'pink'
+    )
+  })
 })
 
 describe('forcedTheme test-suite', () => {
-
-    test('should render saved theme when no forcedTheme is set', () => {
-        localStorageMock['theme'] = 'dark';
-
-        render(
-            <ThemeProvider>
-                <HelperComponent/>
-            </ThemeProvider>
-        )
-
-        expect(screen.getByTestId('theme').textContent).toBe('dark')
-        expect(screen.getByTestId('forcedTheme').textContent).toBe('')
-    })
-
-    test('should render light theme when forcedTheme is set a', () => {
-        localStorageMock['theme'] = 'dark'
-
-        act(() => {
-            render(<ThemeProvider forcedTheme="light">
-                <HelperComponent/>
-            </ThemeProvider>)
-        })
-
-        expect(screen.getByTestId('theme').textContent).toBe('dark')
-        expect(screen.getByTestId('forcedTheme').textContent).toBe('light')
+  test('should render saved theme when no forcedTheme is set', () => {
+    localStorageMock['theme'] = 'dark'
+
+    render(
+      <ThemeProvider>
+        <HelperComponent />
+      </ThemeProvider>
+    )
+
+    expect(screen.getByTestId('theme').textContent).toBe('dark')
+    expect(screen.getByTestId('forcedTheme').textContent).toBe('')
+  })
+
+  test('should render light theme when forcedTheme is set a', () => {
+    localStorageMock['theme'] = 'dark'
+
+    act(() => {
+      render(
+        <ThemeProvider forcedTheme="light">
+          <HelperComponent />
+        </ThemeProvider>
+      )
     })
 
+    expect(screen.getByTestId('theme').textContent).toBe('dark')
+    expect(screen.getByTestId('forcedTheme').textContent).toBe('light')
+  })
 })