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# Disallow unused placeholders in rule report messages (no-unused-placeholders)
This rule aims to disallow unused placeholders in rule report messages.
## Rule Details
Reports when a context.report call contains a data property that does not have a corresponding placeholder in the report message.
Examples of **incorrect** code for this rule:
```js
/*eslint eslint-plugin/no-unused-placeholders: error*/
module.exports = {
create(context) {
context.report({
node,
message: 'something is wrong.',
data: { something: 'foo' }
});
context.report(node, 'something is wrong.', { something: 'foo' });
}
};
```
Examples of **correct** code for this rule:
```js
/*eslint eslint-plugin/no-unused-placeholders: error*/
module.exports = {
create(context) {
context.report({
node,
message: 'something is wrong.'
});
context.report({
node,
message: '{{something}} is wrong.',
data: { something: 'foo' }
});
context.report(node, '{{something}} is wrong.', { something: 'foo' });
}
};
```
## When Not To Use It
If you want to allow unused placeholders, you should turn off this rule.
## Further Reading
* [context.report() API](http://eslint.org/docs/developer-guide/working-with-rules#contextreport)
* [no-missing-placeholders](https://github.com/not-an-aardvark/eslint-plugin-eslint-plugin/blob/master/docs/rules/no-missing-placeholders.md)
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