Function select

select(): Chainable<AnonymousSelectP, "and" | "or" | "select">

match<{ age: number }>(value)
  .with({ age: P.select() }, (age) => 'age: number'
  )
Copy

select<
    input,
    const patternOrKey extends
    
            | undefined
            | null
            | string
            | number
            | bigint
            | boolean
            | symbol
            | readonly []
            | readonly [unknown, unknown]
            | readonly [unknown, unknown]
            | UnknownProperties
            | UnknownMatcher
            | readonly UnknownPattern[]
            | readonly [UnknownPattern, UnknownPattern]
            | readonly [UnknownPattern, UnknownPattern]
            | PatternMatcher<input>
            | {
                readonly [k in string | number | symbol]?: Pattern.Pattern<
                    Readonly<
                        MergeUnion<
                            Exclude<
                                input,
                                readonly any[]
                                | Primitives
                                | Map<any, any>
                                | Set<any>,
                            >,
                        >,
                    >[k],
                >
            },
>(
    patternOrKey: patternOrKey,
): patternOrKey extends string
    ? Chainable<
        SelectP<patternOrKey<patternOrKey>, "and" | "or" | "select">,
    >
    : Chainable<
        SelectP<"@ts-pattern/anonymous-select-key", input, patternOrKey>,
        "and" | "or" | "select",
    >

match<{ age: number }>(value)
  .with({ age: P.select() }, (age) => 'age: number'
  )
Copy

select<
    input,
    const pattern extends
    
            | undefined
            | null
            | string
            | number
            | bigint
            | boolean
            | symbol
            | readonly []
            | readonly [unknown, unknown]
            | readonly [unknown, unknown]
            | UnknownProperties
            | UnknownMatcher
            | readonly UnknownPattern[]
            | readonly [UnknownPattern, UnknownPattern]
            | readonly [UnknownPattern, UnknownPattern]
            | PatternMatcher<input>
            | {
                readonly [k in string | number | symbol]?: Pattern.Pattern<
                    Readonly<
                        MergeUnion<
                            Exclude<
                                input,
                                readonly any[]
                                | Primitives
                                | Map<any, any>
                                | Set<any>,
                            >,
                        >,
                    >[k],
                >
            },
    const k extends string,
>(
    key: k,
    pattern: pattern,
): Chainable<SelectP<k, input, pattern>, "and" | "or" | "select">

match<{ age: number }>(value)
  .with({ age: P.select() }, (age) => 'age: number'
  )
Copy