Support combining matching rules

[mefellows]

In some cases, you need to apply multiple matchers to a field in order to properly validate it. Only Pact JVM currently supports this behaviour.

The capability to combine matching rules will be enabled in the next release (v0.4.19), but the clients will need to update their DSLs to support it.

Motivating Use Case

From a request in slack.

How might you write a matcher to check both the keys and values and the same time (use eachKeyMatches and eachValueMatches simultaneously):

    enum Keys {
      One = "One",
      Two = "Two",
    }

    interface Value {
      min: number
      max: number
    }

    type R = Record<Keys, Value>
    const record: R  = {
      [Keys.One]:
        {
          min: 1,
          max: 2
        }
    }

  it("check record", async () => {
    messagePact
      .expectsToReceive("record")
      .withContent({
        // What need to write here to check type R ?
      })
  })

Proposed API to support this

TBC

Background: pact-foundation/pact-reference#399 (comment)

[mefellows]

See also pact-foundation/pact-php#597

[sergewar]

@mefellows do you have any expectation when this feature will be implemented for JS?

[mefellows]

There are no immediate plans to implement, so if you would like to pick this up I'd be happy to support you.