Add jest extensions on main module (#175)

BREAKING CHANGE

Author: gnapse

README.md

@@ -86,21 +86,22 @@ should be installed as one of your project's `devDependencies`:
 npm install --save-dev @testing-library/jest-dom
 ```
 
-> Note: We also recommend installing the jest-dom eslint plugin which provides auto-fixable lint rules 
-> that prevent false positive tests and improve test readability by ensuring you are using the right
-> matchers in your tests.  More details can be found at
+> Note: We also recommend installing the jest-dom eslint plugin which provides
+> auto-fixable lint rules that prevent false positive tests and improve test
+> readability by ensuring you are using the right matchers in your tests. More
+> details can be found at
 > [eslint-plugin-jest-dom](https://github.com/testing-library/eslint-plugin-jest-dom).
 
 ## Usage
 
-Import `@testing-library/jest-dom/extend-expect` once (for instance in your
-[tests setup file][]) and you're good to go:
+Import `@testing-library/jest-dom` once (for instance in your [tests setup
+file][]) and you're good to go:
 
 [tests setup file]:
   https://jestjs.io/docs/en/configuration.html#setupfilesafterenv-array
 
 ```javascript
-import '@testing-library/jest-dom/extend-expect'
+import '@testing-library/jest-dom'
 ```
 
 > Note: If you're using TypeScript, make sure your setup file is a `.ts` and not
@@ -110,7 +111,10 @@ Alternatively, you can selectively import only the matchers you intend to use,
 and extend jest's `expect` yourself:
 
 ```javascript
-import {toBeInTheDocument, toHaveClass} from '@testing-library/jest-dom'
+import {
+  toBeInTheDocument,
+  toHaveClass,
+} from '@testing-library/jest-dom/matchers'
 
 expect.extend({toBeInTheDocument, toHaveClass})
 ```
@@ -298,10 +302,16 @@ is `false`.
 ##### Using document.querySelector
 
 ```javascript
-expect(document.querySelector('[data-testid="no-aria-invalid"]')).not.toBeInvalid()
+expect(
+  document.querySelector('[data-testid="no-aria-invalid"]'),
+).not.toBeInvalid()
 expect(document.querySelector('[data-testid="aria-invalid"]')).toBeInvalid()
-expect(document.querySelector('[data-testid="aria-invalid-value"]')).toBeInvalid()
-expect(document.querySelector('[data-testid="aria-invalid-false"]')).not.toBeInvalid()
+expect(
+  document.querySelector('[data-testid="aria-invalid-value"]'),
+).toBeInvalid()
+expect(
+  document.querySelector('[data-testid="aria-invalid-false"]'),
+).not.toBeInvalid()
 
 expect(document.querySelector('[data-testid="valid-form"]')).not.toBeInvalid()
 expect(document.querySelector('[data-testid="invalid-form"]')).toBeInvalid()
@@ -427,7 +437,9 @@ must also be `true`.
 ```javascript
 expect(document.querySelector('[data-testid="no-aria-invalid"]')).toBeValid()
 expect(document.querySelector('[data-testid="aria-invalid"]')).not.toBeValid()
-expect(document.querySelector('[data-testid="aria-invalid-value"]')).not.toBeValid()
+expect(
+  document.querySelector('[data-testid="aria-invalid-value"]'),
+).not.toBeValid()
 expect(document.querySelector('[data-testid="aria-invalid-false"]')).toBeValid()
 
 expect(document.querySelector('[data-testid="valid-form"]')).toBeValid()
@@ -1103,7 +1115,6 @@ expect(document.querySelector('.cancel-button')).toBeTruthy()
 > replacing `toBeInTheDOM` to read through the documentation of the proposed
 > alternatives to see which use case works better for your needs.
 
-
 ## Inspiration
 
 This whole library was extracted out of Kent C. Dodds' [DOM Testing

src/extend-expect.js

@@ -1,3 +1,3 @@
-import * as extensions from './index'
+import * as extensions from './matchers'
 
 expect.extend(extensions)

src/index.js

@@ -1,39 +1 @@
-import {toBeInTheDOM} from './to-be-in-the-dom'
-import {toBeInTheDocument} from './to-be-in-the-document'
-import {toBeEmpty} from './to-be-empty'
-import {toContainElement} from './to-contain-element'
-import {toContainHTML} from './to-contain-html'
-import {toHaveTextContent} from './to-have-text-content'
-import {toHaveAttribute} from './to-have-attribute'
-import {toHaveClass} from './to-have-class'
-import {toHaveStyle} from './to-have-style'
-import {toHaveFocus} from './to-have-focus'
-import {toHaveFormValues} from './to-have-form-values'
-import {toBeVisible} from './to-be-visible'
-import {toBeDisabled, toBeEnabled} from './to-be-disabled'
-import {toBeRequired} from './to-be-required'
-import {toBeInvalid, toBeValid} from './to-be-invalid'
-import {toHaveValue} from './to-have-value'
-import {toBeChecked} from './to-be-checked'
-
-export {
-  toBeInTheDOM,
-  toBeInTheDocument,
-  toBeEmpty,
-  toContainElement,
-  toContainHTML,
-  toHaveTextContent,
-  toHaveAttribute,
-  toHaveClass,
-  toHaveStyle,
-  toHaveFocus,
-  toHaveFormValues,
-  toBeVisible,
-  toBeDisabled,
-  toBeEnabled,
-  toBeRequired,
-  toBeInvalid,
-  toBeValid,
-  toHaveValue,
-  toBeChecked,
-}
+import './extend-expect'

src/matchers.js

@@ -0,0 +1,39 @@
+import {toBeInTheDOM} from './to-be-in-the-dom'
+import {toBeInTheDocument} from './to-be-in-the-document'
+import {toBeEmpty} from './to-be-empty'
+import {toContainElement} from './to-contain-element'
+import {toContainHTML} from './to-contain-html'
+import {toHaveTextContent} from './to-have-text-content'
+import {toHaveAttribute} from './to-have-attribute'
+import {toHaveClass} from './to-have-class'
+import {toHaveStyle} from './to-have-style'
+import {toHaveFocus} from './to-have-focus'
+import {toHaveFormValues} from './to-have-form-values'
+import {toBeVisible} from './to-be-visible'
+import {toBeDisabled, toBeEnabled} from './to-be-disabled'
+import {toBeRequired} from './to-be-required'
+import {toBeInvalid, toBeValid} from './to-be-invalid'
+import {toHaveValue} from './to-have-value'
+import {toBeChecked} from './to-be-checked'
+
+export {
+  toBeInTheDOM,
+  toBeInTheDocument,
+  toBeEmpty,
+  toContainElement,
+  toContainHTML,
+  toHaveTextContent,
+  toHaveAttribute,
+  toHaveClass,
+  toHaveStyle,
+  toHaveFocus,
+  toHaveFormValues,
+  toBeVisible,
+  toBeDisabled,
+  toBeEnabled,
+  toBeRequired,
+  toBeInvalid,
+  toBeValid,
+  toHaveValue,
+  toBeChecked,
+}