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feat: add render-result-naming-convention rule (#200)
* feat: rule skeleton * test: first round * feat: rule implementation round 1 * refactor: move hasTestingLibraryImportModule * test: fix invalid lines * feat: check imported module * feat: check imported render renamed * feat: check custom render * test: add more valid tests for custom render functions * test: update tests for render wrapper functions * docs: add rule docs * test: increase coverage up to 100% * fix: add rule meta description * docs: update rule details to mention screen object * refactor: return as soon as conditions are not met * feat: check wildcard imports * refactor: rename default import * docs: include render result link
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| # Enforce a valid naming for return value from `render` (render-result-naming-convention) | ||
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| > The name `wrapper` is old cruft from `enzyme` and we don't need that here. The return value from `render` is not "wrapping" anything. It's simply a collection of utilities that you should actually not often need anyway. | ||
| ## Rule Details | ||
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| This rule aims to ensure the return value from `render` is named properly. | ||
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| Ideally, you should destructure the minimum utils that you need from `render`, combined with using queries from [`screen` object](https://github.com/testing-library/eslint-plugin-testing-library/blob/master/docs/rules/prefer-screen-queries.md). In case you need to save the collection of utils returned in a variable, its name should be either `view` or `utils`, as `render` is not wrapping anything: it's just returning a collection of utilities. Every other name for that variable will be considered invalid. | ||
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| To sum up these rules, the allowed naming convention for return value from `render` is: | ||
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| - destructuring | ||
| - `view` | ||
| - `utils` | ||
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| Examples of **incorrect** code for this rule: | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // return value from `render` shouldn't be kept in a var called "wrapper" | ||
| const wrapper = render(<SomeComponent />); | ||
| ``` | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // return value from `render` shouldn't be kept in a var called "component" | ||
| const component = render(<SomeComponent />); | ||
| ``` | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // to sum up: return value from `render` shouldn't be kept in a var called other than "view" or "utils" | ||
| const somethingElse = render(<SomeComponent />); | ||
| ``` | ||
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| Examples of **correct** code for this rule: | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // destructuring return value from `render` is correct | ||
| const { unmount, rerender } = render(<SomeComponent />); | ||
| ``` | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // keeping return value from `render` in a var called "view" is correct | ||
| const view = render(<SomeComponent />); | ||
| ``` | ||
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| ```javascript | ||
| import { render } from '@testing-library/framework'; | ||
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| // ... | ||
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| // keeping return value from `render` in a var called "utils" is correct | ||
| const utils = render(<SomeComponent />); | ||
| ``` | ||
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| ## Further Reading | ||
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| - [Common Mistakes with React Testing Library](https://kentcdodds.com/blog/common-mistakes-with-react-testing-library#using-wrapper-as-the-variable-name-for-the-return-value-from-render) | ||
| - [`render` Result](https://testing-library.com/docs/react-testing-library/api#render-result) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| import { ESLintUtils, TSESTree } from '@typescript-eslint/experimental-utils'; | ||
| import { getDocsUrl, hasTestingLibraryImportModule } from '../utils'; | ||
| import { | ||
| isCallExpression, | ||
| isIdentifier, | ||
| isImportSpecifier, | ||
| isMemberExpression, | ||
| isObjectPattern, | ||
| isRenderVariableDeclarator, | ||
| } from '../node-utils'; | ||
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| export const RULE_NAME = 'render-result-naming-convention'; | ||
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| const ALLOWED_VAR_NAMES = ['view', 'utils']; | ||
| const ALLOWED_VAR_NAMES_TEXT = ALLOWED_VAR_NAMES.map( | ||
| name => '`' + name + '`' | ||
| ).join(', '); | ||
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| export default ESLintUtils.RuleCreator(getDocsUrl)({ | ||
| name: RULE_NAME, | ||
| meta: { | ||
| type: 'suggestion', | ||
| docs: { | ||
| description: 'Enforce a valid naming for return value from `render`', | ||
| category: 'Best Practices', | ||
| recommended: false, | ||
| }, | ||
| messages: { | ||
| invalidRenderResultName: `\`{{ varName }}\` is not a recommended name for \`render\` returned value. Instead, you should destructure it, or call it using one of the valid choices: ${ALLOWED_VAR_NAMES_TEXT}`, | ||
| }, | ||
| fixable: null, | ||
| schema: [ | ||
| { | ||
| type: 'object', | ||
| properties: { | ||
| renderFunctions: { | ||
| type: 'array', | ||
| }, | ||
| }, | ||
| }, | ||
| ], | ||
| }, | ||
| defaultOptions: [ | ||
| { | ||
| renderFunctions: [], | ||
| }, | ||
| ], | ||
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| create(context, [options]) { | ||
| const { renderFunctions } = options; | ||
| let renderAlias: string | undefined; | ||
| let wildcardImportName: string | undefined; | ||
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| return { | ||
| // check named imports | ||
| ImportDeclaration(node: TSESTree.ImportDeclaration) { | ||
| if (!hasTestingLibraryImportModule(node)) { | ||
| return; | ||
| } | ||
| const renderImport = node.specifiers.find( | ||
| node => isImportSpecifier(node) && node.imported.name === 'render' | ||
| ); | ||
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| if (!renderImport) { | ||
| return; | ||
| } | ||
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| renderAlias = renderImport.local.name; | ||
| }, | ||
| // check wildcard imports | ||
| 'ImportDeclaration ImportNamespaceSpecifier'( | ||
| node: TSESTree.ImportNamespaceSpecifier | ||
| ) { | ||
| if ( | ||
| !hasTestingLibraryImportModule( | ||
| node.parent as TSESTree.ImportDeclaration | ||
| ) | ||
| ) { | ||
| return; | ||
| } | ||
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| wildcardImportName = node.local.name; | ||
| }, | ||
| VariableDeclarator(node: TSESTree.VariableDeclarator) { | ||
| // check if destructuring return value from render | ||
| if (isObjectPattern(node.id)) { | ||
| return; | ||
| } | ||
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| const isValidRenderDeclarator = isRenderVariableDeclarator(node, [ | ||
| ...renderFunctions, | ||
| renderAlias, | ||
| ]); | ||
| const isValidWildcardImport = !!wildcardImportName; | ||
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| // check if is a Testing Library related import | ||
| if (!isValidRenderDeclarator && !isValidWildcardImport) { | ||
| return; | ||
| } | ||
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| const renderFunctionName = | ||
| isCallExpression(node.init) && | ||
| isIdentifier(node.init.callee) && | ||
| node.init.callee.name; | ||
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| const renderFunctionObjectName = | ||
| isCallExpression(node.init) && | ||
| isMemberExpression(node.init.callee) && | ||
| isIdentifier(node.init.callee.property) && | ||
| isIdentifier(node.init.callee.object) && | ||
| node.init.callee.property.name === 'render' && | ||
| node.init.callee.object.name; | ||
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| const isRenderAlias = !!renderAlias; | ||
| const isCustomRender = renderFunctions.includes(renderFunctionName); | ||
| const isWildCardRender = | ||
| renderFunctionObjectName && | ||
| renderFunctionObjectName === wildcardImportName; | ||
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| // check if is a qualified render function | ||
| if (!isRenderAlias && !isCustomRender && !isWildCardRender) { | ||
| return; | ||
| } | ||
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| const renderResultName = isIdentifier(node.id) && node.id.name; | ||
| const isAllowedRenderResultName = ALLOWED_VAR_NAMES.includes( | ||
| renderResultName | ||
| ); | ||
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| // check if return value var name is allowed | ||
| if (isAllowedRenderResultName) { | ||
| return; | ||
| } | ||
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| context.report({ | ||
| node, | ||
| messageId: 'invalidRenderResultName', | ||
| data: { | ||
| varName: renderResultName, | ||
| }, | ||
| }); | ||
| }, | ||
| }; | ||
| }, | ||
| }); |
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