# Join

Formats a tuple of Path AST nodes as its normalized route string literal type.

## Signatures

```ts
export type Join<Parts extends ReadonlyArray<PathAst>> = `/${StringJoin<{
    [K in keyof Parts]: FormatAst<Parts[K]>;
}, "">}`;
```

## Why

Compile-time Route paths use the same slash, parameter, wildcard, and query formatting rules as the runtime `join` function.

## Ownership and lifetime

TypeScript computes `Join` from the route literal or AST tuple supplied to it; the alias is erased and retains no runtime data.