Envelope Pattern TypeScript - v1.0.0-alpha.20
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    Type Alias Pattern

    Pattern:
        | { type: "Leaf"; pattern: LeafPattern }
        | { type: "Structure"; pattern: StructurePattern }
        | { type: "Meta"; pattern: MetaPattern }

    The main pattern type used for matching envelopes.

    Corresponds to the Rust Pattern enum in pattern/mod.rs