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Added no-unsafe rule #1831

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merged 5 commits into from Jun 21, 2018
Merged

Added no-unsafe rule #1831

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b5e86bf
Added `no-unsafe` rule
sergei-startsev Jun 17, 2018
5b08a1e
Adjusted `no-unsafe` rule
sergei-startsev Jun 19, 2018
5e17159
Added missed position details for `no-unsafe`
sergei-startsev Jun 19, 2018
e41500a
Added early termination for no-unsafe, adjusted tests to support ESLint3
sergei-startsev Jun 19, 2018
0285eef
Excluded `no-unsafe` from the recommended for now to avoid breaking c…
sergei-startsev Jun 20, 2018
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3 changes: 2 additions & 1 deletion docs/rules/no-unsafe.md
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@@ -1,7 +1,8 @@
# Prevent usage of `UNSAFE_` methods (react/no-unsafe)

Certain legacy lifecycle methods are unsafe for use in async React applications and cause warnings in [_strict mode_][strict_mode]. These also happen to be the lifecycles that cause the most [confusion within the React community][component_lifecycle_changes].
Certain legacy lifecycle methods are [unsafe for use in async React applications][async_rendering] and cause warnings in [_strict mode_][strict_mode]. These also happen to be the lifecycles that cause the most [confusion within the React community][component_lifecycle_changes].

[async_rendering]: https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html
[strict_mode]: https://reactjs.org/docs/strict-mode.html#identifying-unsafe-lifecycles
[component_lifecycle_changes]: https://reactjs.org/blog/2018/03/29/react-v-16-3.html#component-lifecycle-changes

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6 changes: 4 additions & 2 deletions lib/rules/no-unsafe.js
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Expand Up @@ -8,6 +8,7 @@
const Components = require('../util/Components');
const astUtil = require('../util/ast');
const docsUrl = require('../util/docsUrl');
const versionUtil = require('../util/version');

// ------------------------------------------------------------------------------
// Rule Definition
Expand Down Expand Up @@ -44,7 +45,8 @@ module.exports = {
*/
function isUnsafe(method) {
const unsafeMethods = getUnsafeMethods();
return unsafeMethods.indexOf(method) !== -1;
const isApplicable = versionUtil.testReactVersion(context, '16.3.0');
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This seems like a check we could do earlier, and prevent even returning any visitors in the first place?

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Added early termination for the rule.

return unsafeMethods.indexOf(method) !== -1 && isApplicable;
}

/**
Expand All @@ -59,7 +61,7 @@ module.exports = {

context.report({
node: node,
message: `Do not use ${method}`
message: `${method} is unsafe for use in async rendering, see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html`
});
}

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66 changes: 56 additions & 10 deletions tests/lib/rules/no-unsafe.js
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Expand Up @@ -19,6 +19,10 @@ const parserOptions = {
}
};

function errorMessage(method) {
return `${method} is unsafe for use in async rendering, see https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html`;
}

// ------------------------------------------------------------------------------
// Tests
// ------------------------------------------------------------------------------
Expand All @@ -32,15 +36,17 @@ ruleTester.run('no-unsafe', rule, {
componentDidUpdate() {}
render() {}
}
`
`,
settings: {react: {version: '16.4.0'}}
},
{
code: `
const Foo = createReactClass({
componentDidUpdate: function() {},
render: function() {}
});
`
`,
settings: {react: {version: '16.4.0'}}
},
{
code: `
Expand All @@ -49,7 +55,8 @@ ruleTester.run('no-unsafe', rule, {
UNSAFE_componentWillReceiveProps() {}
UNSAFE_componentWillUpdate() {}
}
`
`,
settings: {react: {version: '16.4.0'}}
},
{
code: `
Expand All @@ -58,7 +65,28 @@ ruleTester.run('no-unsafe', rule, {
UNSAFE_componentWillReceiveProps: function() {},
UNSAFE_componentWillUpdate: function() {},
});
`
`,
settings: {react: {version: '16.4.0'}}
},
{
code: `
class Foo extends React.Component {
UNSAFE_componentWillMount() {}
UNSAFE_componentWillReceiveProps() {}
UNSAFE_componentWillUpdate() {}
}
`,
settings: {react: {version: '16.2.0'}}
},
{
code: `
const Foo = createReactClass({
UNSAFE_componentWillMount: function() {},
UNSAFE_componentWillReceiveProps: function() {},
UNSAFE_componentWillUpdate: function() {},
});
`,
settings: {react: {version: '16.2.0'}}
}
],

Expand All @@ -71,15 +99,28 @@ ruleTester.run('no-unsafe', rule, {
UNSAFE_componentWillUpdate() {}
}
`,
settings: {react: {version: '16.3.0'}},
errors: [
{
message: 'Do not use UNSAFE_componentWillMount'
message: errorMessage('UNSAFE_componentWillMount'),
line: 2,
column: 7,
endLine: 6,
endColumn: 8
},
{
message: 'Do not use UNSAFE_componentWillReceiveProps'
message: errorMessage('UNSAFE_componentWillReceiveProps'),
line: 2,
column: 7,
endLine: 6,
endColumn: 8
},
{
message: 'Do not use UNSAFE_componentWillUpdate'
message: errorMessage('UNSAFE_componentWillUpdate'),
line: 2,
column: 7,
endLine: 6,
endColumn: 8
}
]
},
Expand All @@ -91,15 +132,20 @@ ruleTester.run('no-unsafe', rule, {
UNSAFE_componentWillUpdate: function() {},
});
`,
settings: {react: {version: '16.3.0'}},
errors: [
{
message: 'Do not use UNSAFE_componentWillMount'
message: errorMessage('UNSAFE_componentWillMount'),
line: 2,
column: 38,
endLine: 6,
endColumn: 10
},
{
message: 'Do not use UNSAFE_componentWillReceiveProps'
message: errorMessage('UNSAFE_componentWillReceiveProps')
},
{
message: 'Do not use UNSAFE_componentWillUpdate'
message: errorMessage('UNSAFE_componentWillUpdate')
}
]
}
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