[Home](./index.md) > [@contract-case/case-definition-dsl](./case-definition-dsl.md) > [matchers](./case-definition-dsl.matchers.md) > [base](./case-definition-dsl.matchers.base.md) > [AnyMatcher](./case-definition-dsl.matchers.base.anymatcher.md) > [(constructor)](./case-definition-dsl.matchers.base.anymatcher._constructor_.md) ## matchers.base.AnyMatcher.(constructor) The base class for all Test Equivalence Matchers. Extend this if you don't have an example in your Matcher. Otherwise, use Matcher strings beginning with `_case:` are reserved for the default ContractCase matchers. Only use a types prefixed with `_case:` if you wish to create a special case for a matching behaviour that is already provided by a core ContractCase matcher. **Signature:** ```typescript constructor(matcherType: string); ``` ## Parameters

Parameter	Type	Description
matcherType	string	The type string for this matcher (see [Extending ContractCase](https://case.contract-testing.io/docs/reference/plugin-framework) for a description of these strings).