I am getting an ESlint error Don't use `{}` as a type. `{}` actually means "any non-nullish value". in my Contact component whiling using React and TypeScript.
The component doesn't have any props.
export default class Contact extends React.Component<{}, MyState> {
constructor(props = {}) {
super(props);
this.state = {
signedUp: false,
};
}
}
I tried using null instead, but that threw other ESLint errors.
After a lot of digging I found the following GitHub issues.
By adding the following to your .eslintrc.js you are able to ignore the rule. It is recommended to use Configurations to have this rule only apply to React components. This will ensure strong typing everywhere else.
"rules": {
"@typescript-eslint/ban-types": [
"error",
{
"extendDefaults": true,
"types": {
"{}": false
}
}
]
}
}
Source: https://github.com/typescript-eslint/typescript-eslint/issues/2063#issuecomment-675156492
Expanding on Jordan answer to apply this rule to only React components in the .eslintrc.js file add
overrides: [
{
files: ['*.tsx, *.jsx'],
rules: {
'@typescript-eslint/ban-types': [
'error',
{
extendDefaults: true,
types: {
'{}': false,
},
},
],
},
},
]
I don't think so, the chosen answer is correct. For anyone googling it, I'll leave it at what ESLint says:
- If you want a type meaning "any object", you probably want
Record<string, unknown>instead.- If you want a type meaning "any value", you probably want
unknowninstead.- If you want a type meaning "empty object", you probably want
Record<string, never>instead.