Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #2110 from drx/master
[new] Add prefer-read-only-props rule
- Loading branch information
Showing
4 changed files
with
372 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,47 @@ | ||
# Enforce that props are read-only (react/prefer-read-only-props) | ||
|
||
Using Flow, one can define types for props. This rule enforces that prop types are read-only (covariant). | ||
|
||
## Rule Details | ||
|
||
The following patterns are considered warnings: | ||
|
||
```jsx | ||
type Props = { | ||
name: string, | ||
} | ||
class Hello extends React.Component<Props> { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
|
||
function Hello(props: {-name: string}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
|
||
const Hello = (props: {|name: string|}) => ( | ||
<div>Hello {props.name}</div> | ||
); | ||
``` | ||
|
||
The following patterns are **not** considered warnings: | ||
|
||
```jsx | ||
type Props = { | ||
+name: string, | ||
} | ||
class Hello extends React.Component<Props> { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
|
||
function Hello(props: {+name: string}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
|
||
const Hello = (props: {|+name: string|}) => ( | ||
<div>Hello {props.name}</div> | ||
); | ||
``` |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,74 @@ | ||
/** | ||
* @fileoverview Require component props to be typed as read-only. | ||
* @author Luke Zapart | ||
*/ | ||
'use strict'; | ||
|
||
const Components = require('../util/Components'); | ||
const docsUrl = require('../util/docsUrl'); | ||
|
||
function isFlowPropertyType(node) { | ||
return node.type === 'ObjectTypeProperty'; | ||
} | ||
|
||
function isCovariant(node) { | ||
return node.variance && node.variance.kind === 'plus'; | ||
} | ||
|
||
// ------------------------------------------------------------------------------ | ||
// Rule Definition | ||
// ------------------------------------------------------------------------------ | ||
|
||
module.exports = { | ||
meta: { | ||
docs: { | ||
description: 'Require read-only props.', | ||
category: 'Stylistic Issues', | ||
recommended: false, | ||
url: docsUrl('prefer-read-only-props') | ||
}, | ||
fixable: 'code', | ||
schema: [] | ||
}, | ||
|
||
create: Components.detect((context, components) => ({ | ||
'Program:exit': function () { | ||
const list = components.list(); | ||
|
||
Object.keys(list).forEach(key => { | ||
const component = list[key]; | ||
|
||
if (!component.declaredPropTypes) { | ||
return; | ||
} | ||
|
||
Object.keys(component.declaredPropTypes).forEach(propName => { | ||
const prop = component.declaredPropTypes[propName]; | ||
|
||
if (!isFlowPropertyType(prop.node)) { | ||
return; | ||
} | ||
|
||
if (!isCovariant(prop.node)) { | ||
context.report({ | ||
node: prop.node, | ||
message: 'Prop \'{{propName}}\' should be read-only.', | ||
data: { | ||
propName | ||
}, | ||
fix: fixer => { | ||
if (!prop.node.variance) { | ||
// Insert covariance | ||
return fixer.insertTextBefore(prop.node, '+'); | ||
} | ||
|
||
// Replace contravariance with covariance | ||
return fixer.replaceText(prop.node.variance, '+'); | ||
} | ||
}); | ||
} | ||
}); | ||
}); | ||
} | ||
})) | ||
}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,250 @@ | ||
/** | ||
* @fileoverview Require component props to be typed as read-only. | ||
* @author Luke Zapart | ||
*/ | ||
'use strict'; | ||
|
||
// ----------------------------------------------------------------------------- | ||
// Requirements | ||
// ----------------------------------------------------------------------------- | ||
|
||
const rule = require('../../../lib/rules/prefer-read-only-props'); | ||
const RuleTester = require('eslint').RuleTester; | ||
|
||
const parserOptions = { | ||
ecmaVersion: 2018, | ||
sourceType: 'module', | ||
ecmaFeatures: { | ||
jsx: true | ||
} | ||
}; | ||
|
||
// ------------------------------------------------------------------------------ | ||
// Tests | ||
// ------------------------------------------------------------------------------ | ||
|
||
const ruleTester = new RuleTester({parserOptions}); | ||
ruleTester.run('prefer-read-only-props', rule, { | ||
|
||
valid: [ | ||
{ | ||
// Class component with type parameter | ||
code: ` | ||
type Props = { | ||
+name: string, | ||
} | ||
class Hello extends React.Component<Props> { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// Class component with typed props property | ||
code: ` | ||
class Hello extends React.Component { | ||
props: { | ||
+name: string, | ||
} | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// Functional component with typed props argument | ||
code: ` | ||
function Hello(props: {+name: string}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// Functional component with type intersection | ||
code: ` | ||
type PropsA = {+firstName: string}; | ||
type PropsB = {+lastName: string}; | ||
type Props = PropsA & PropsB; | ||
function Hello({firstName, lastName}: Props) { | ||
return <div>Hello {firstName} {lastName}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// Arrow function | ||
code: ` | ||
const Hello = (props: {+name: string}) => ( | ||
<div>Hello {props.name}</div> | ||
); | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// Destructured props | ||
code: ` | ||
const Hello = ({name}: {+name: string}) => ( | ||
<div>Hello {props.name}</div> | ||
); | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// No error, because this is not a component | ||
code: ` | ||
const notAComponent = (props: {n: number}) => { | ||
return props.n + 1; | ||
}; | ||
`, | ||
parser: 'babel-eslint' | ||
}, | ||
{ | ||
// No error, because there is no Props flow type | ||
code: ` | ||
class Hello extends React.Component { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
` | ||
}, | ||
{ | ||
// No error, because PropTypes do not support variance | ||
code: ` | ||
class Hello extends React.Component { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
Hello.propTypes = { | ||
name: PropTypes.string, | ||
}; | ||
` | ||
} | ||
], | ||
|
||
invalid: [ | ||
{ | ||
// Props.name is not read-only | ||
code: ` | ||
type Props = { | ||
name: string, | ||
} | ||
class Hello extends React.Component<Props> { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
// Props.name is contravariant | ||
code: ` | ||
type Props = { | ||
-name: string, | ||
} | ||
class Hello extends React.Component<Props> { | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
class Hello extends React.Component { | ||
props: { | ||
name: string, | ||
} | ||
render () { | ||
return <div>Hello {this.props.name}</div>; | ||
} | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
function Hello(props: {name: string}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
function Hello(props: {|name: string|}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
function Hello({name}: {name: string}) { | ||
return <div>Hello {props.name}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
type PropsA = {firstName: string}; | ||
type PropsB = {lastName: string}; | ||
type Props = PropsA & PropsB; | ||
function Hello({firstName, lastName}: Props) { | ||
return <div>Hello {firstName} {lastName}</div>; | ||
} | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'firstName\' should be read-only.' | ||
}, { | ||
message: 'Prop \'lastName\' should be read-only.' | ||
}] | ||
}, | ||
{ | ||
code: ` | ||
const Hello = (props: {-name: string}) => ( | ||
<div>Hello {props.name}</div> | ||
); | ||
`, | ||
parser: 'babel-eslint', | ||
errors: [{ | ||
message: 'Prop \'name\' should be read-only.' | ||
}] | ||
} | ||
] | ||
}); |