feat: add custom Nuxt client

src/client/index.ts

@@ -0,0 +1,89 @@
+import { type CreateTRPCClientOptions, type inferRouterProxyClient, createTRPCProxyClient, httpBatchLink as _httpBatchLink } from '@trpc/client'
+import { type AnyRouter } from '@trpc/server'
+import { createFlatProxy, createRecursiveProxy } from '@trpc/server/shared'
+import { hash } from 'ohash'
+import { nanoid } from 'nanoid'
+import { type DecoratedProcedureRecord } from './types'
+// @ts-expect-error: Nuxt auto-imports
+import { getCurrentInstance, onScopeDispose, useAsyncData, useRequestHeaders, ref, unref } from '#imports'
+
+/**
+ * Calculates the key used for `useAsyncData` call
+ */
+export function getQueryKey (
+  path: string,
+  input: unknown
+): string {
+  return input === undefined ? path : `${path}-${hash(input || '')}`
+}
+
+export function createNuxtProxyDecoration<TRouter extends AnyRouter> (name: string, client: inferRouterProxyClient<TRouter>) {
+  return createRecursiveProxy((opts) => {
+    const args = opts.args
+
+    const pathCopy = [name, ...opts.path]
+
+    // The last arg is for instance `.useMutation` or `.useQuery()`
+    const lastArg = pathCopy.pop()!
+
+    // The `path` ends up being something like `post.byId`
+    const path = pathCopy.join('.')
+
+    const [input, otherOptions] = args
+
+    const { trpc, ...asyncDataOptions } = otherOptions || {} as any
+
+    let controller: AbortController
+
+    if (trpc?.abortOnUnmount) {
+      if (getCurrentInstance()) {
+        onScopeDispose(() => {
+          controller?.abort?.()
+        })
+      }
+      controller = typeof AbortController !== 'undefined' ? new AbortController() : {} as AbortController
+    }
+
+    if (lastArg === 'useQuery') {
+      const queryKey = getQueryKey(path, input)
+      return useAsyncData(queryKey, () => (client as any)[path].query(input, {
+        signal: controller?.signal,
+        ...trpc
+      }), asyncDataOptions)
+    }
+
+    if (lastArg === 'useMutation') {
+      const reactiveInput = ref(null)
+      const { refresh, ...result } = useAsyncData(nanoid(), () => (client as any)[path].mutate(reactiveInput.value, {
+        signal: controller?.signal,
+        ...trpc
+      }), {
+        ...asyncDataOptions,
+        immediate: false
+      })
+
+      async function mutate (_input: any) {
+        reactiveInput.value = _input
+        await refresh()
+        return unref(result.data)
+      }
+
+      return {
+        mutate,
+        ...result
+      }
+    }
+
+    return (client as any)[path][lastArg](input)
+  })
+}
+
+export function createTRPCNuxtClient<TRouter extends AnyRouter> (opts: CreateTRPCClientOptions<TRouter>) {
+  const client = createTRPCProxyClient<TRouter>(opts)
+
+  const decoratedClient = createFlatProxy((key) => {
+    return createNuxtProxyDecoration(key, client)
+  }) as DecoratedProcedureRecord<TRouter['_def']['record'], TRouter>
+
+  return decoratedClient
+}

src/client/types.ts

@@ -0,0 +1,94 @@
+import type { TRPCClientErrorLike, TRPCRequestOptions as _TRPCRequestOptions } from '@trpc/client'
+import { type TRPCSubscriptionObserver } from '@trpc/client/dist/internals/TRPCClient'
+import type {
+  AnyMutationProcedure,
+  AnyProcedure,
+  AnyQueryProcedure,
+  AnyRouter,
+  ProcedureRouterRecord,
+  inferProcedureInput,
+  inferProcedureOutput,
+  ProcedureArgs,
+  AnySubscriptionProcedure
+} from '@trpc/server'
+import { type inferObservableValue, type Unsubscribable } from '@trpc/server/observable'
+import { inferTransformedProcedureOutput } from '@trpc/server/shared'
+// import { inferTransformedProcedureOutput } from '@trpc/server/shared'
+import type {
+  AsyncData,
+  AsyncDataOptions,
+  KeyOfRes,
+  PickFrom,
+  _Transform
+} from 'nuxt/dist/app/composables/asyncData'
+
+// Modified @trpc/client and @trpc/react-query types
+// https://github.com/trpc/trpc/blob/next/packages/client/src/createTRPCClientProxy.ts
+// https://github.com/trpc/trpc/blob/next/packages/react-query/src/createTRPCReact.tsx
+
+interface TRPCRequestOptions extends _TRPCRequestOptions {
+  abortOnUnmount?: boolean
+}
+
+type Resolver<TProcedure extends AnyProcedure> = (
+  ...args: ProcedureArgs<TProcedure['_def']>
+) => Promise<inferTransformedProcedureOutput<TProcedure>>;
+
+type SubscriptionResolver<
+  TProcedure extends AnyProcedure,
+  TRouter extends AnyRouter,
+> = (
+  ...args: [
+    input: ProcedureArgs<TProcedure['_def']>[0],
+    opts: ProcedureArgs<TProcedure['_def']>[1] &
+    Partial<
+        TRPCSubscriptionObserver<
+          inferObservableValue<inferProcedureOutput<TProcedure>>,
+          TRPCClientErrorLike<TRouter>
+        >
+      >,
+  ]
+) => Unsubscribable
+
+type DecorateProcedure<
+  TProcedure extends AnyProcedure,
+  TRouter extends AnyRouter,
+> = TProcedure extends AnyQueryProcedure
+  ? {
+      useQuery: <
+      TData = inferTransformedProcedureOutput<TProcedure>,
+      Transform extends _Transform<TData> = _Transform<TData, TData>,
+      PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>,
+     >(
+        input: inferProcedureInput<TProcedure>,
+        opts?: AsyncDataOptions<TData, Transform, PickKeys> & { trpc?: TRPCRequestOptions },
+      ) => AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, TRPCClientErrorLike<TProcedure>>,
+      query: Resolver<TProcedure>
+    } : TProcedure extends AnyMutationProcedure ? {
+      useMutation: <
+      TData = inferTransformedProcedureOutput<TProcedure>,
+      Transform extends _Transform<TData> = _Transform<TData, TData>,
+      PickKeys extends KeyOfRes<Transform> = KeyOfRes<Transform>,
+     >(
+        opts?: AsyncDataOptions<TData, Transform, PickKeys> & { trpc?: TRPCRequestOptions },
+      ) => AsyncData<PickFrom<ReturnType<Transform>, PickKeys>, TRPCClientErrorLike<TProcedure>> & {
+        mutate: (input: inferProcedureInput<TProcedure>) => Promise<PickFrom<ReturnType<Transform>, PickKeys>>
+      },
+      mutate: Resolver<TProcedure>
+    } : TProcedure extends AnySubscriptionProcedure ? {
+      subscribe: SubscriptionResolver<TProcedure, TRouter>
+    } : never
+
+/**
+* @internal
+*/
+export type DecoratedProcedureRecord<
+  TProcedures extends ProcedureRouterRecord,
+  TRouter extends AnyRouter,
+> = {
+  [TKey in keyof TProcedures]: TProcedures[TKey] extends AnyRouter
+    ? DecoratedProcedureRecord<TProcedures[TKey]['_def']['record'], TRouter>
+    : TProcedures[TKey] extends AnyProcedure
+      ? DecorateProcedure<TProcedures[TKey], TRouter>
+      : never;
+}