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# require rules to implement a meta.schema property (require-meta-schema)
Defining a schema for each rule allows eslint to validate that configuration options are passed correctly. Even when there are no options for a rule, a schema should still be defined (as an empty array) so that eslint can validate that no data is passed to the rule.
## Rule Details
This rule requires ESLint rules to have a valid `meta.schema` property.
Examples of **incorrect** code for this rule:
```js
/* eslint eslint-plugin/require-meta-schema: error */
module.exports = {
meta: {},
create: function(context) { /* ... */}
};
module.exports = {
meta: { schema: null },
create: function(context) { /* ... */}
};
```
Examples of **correct** code for this rule:
```js
/* eslint eslint-plugin/require-meta-type: error */
module.exports = {
meta: { schema: [] }, // ensures no options are passed to the rule
create: function(context) { /* ... */}
};
module.exports = {
meta: {
schema: [
{
type: 'object',
properties: {
exceptRange: {
type: 'boolean'
}
},
additionalProperties: false
}
]
},
create: function(context) { /* ... */}
};
```
## Further Reading
* [working-with-rules#options-schemas](https://eslint.org/docs/developer-guide/working-with-rules#options-schemas)
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