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Jun 2025 (v0.3.5)

Mochi v0.3.5 introduces a new fetch expression for performing HTTP requests. Responses are decoded into typed values, and optional with parameters allow setting the HTTP method, headers, and body. The interpreter ships with a simple HTTP helper and the Python and TypeScript compilers now emit fetch support.

Fetch Expression​

type Todo {
  userId: int
  id: int
  title: string
  completed: bool
}

let todo: Todo = fetch "https://example.com/todos/1"

let created: Todo = fetch "https://example.com/todos" with {
  method: "POST",
  headers: {
    "Content-Type": "application/json"
  },
  body: todo
}

Other Changes​

  • Type checking for fetch options
  • Python and TypeScript compilers support fetch
  • Runtime HTTP helper for the interpreter