Short Circuit

This example shows how you can short circuit your anyware at any hook. This is more succinct than having to manually write each hook execution even past your desired one until the final result.

// Our website uses Vitepress+Twoslash. Twoslash does not discover the generated Graffle modules.
// Perhaps we can configure Twoslash to include them. Until we figure that out, we have to
// explicitly import them like this.
import './graffle/modules/global.js'
// ---cut---

import { Graffle } from 'graffle'

Graffle
  .create()
  .transport({ url: `http://localhost:3000/graphql` })
  .anyware(async ({ encode }) => {
    const { pack } = await encode()
    const { exchange } = await pack()

    if (exchange.input.transportType !== `http`) return exchange()

    const mergedHeaders = new Headers(exchange.input.request.headers)
    mergedHeaders.set(`X-Custom-Header`, `123`)
    // Notice how we **end** with the `exchange` hook, skipping the `unpack` and `decode` hooks.
    return await exchange({
      input: {
        ...exchange.input,
        request: {
          ...exchange.input.request,
          headers: mergedHeaders,
        },
      },
    })
  })