Function intersection

P.intersection(...patterns) returns a pattern which matches only if every patterns provided in parameter match the input.

Read the documentation for P.intersection on GitHub

Example

match(value)
  .with(
    {
      user: P.intersection(
        { firstname: P.string },
        { lastname: P.string },
        { age: P.when(age => age > 21) }
      )
    },
    ({ user }) => 'will match { firstname: string, lastname: string, age: number } if age > 21'
  )
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