Spoosh Angular

Spoosh is a type-safe API toolkit with a composable plugin architecture for TypeScript. This skill covers the Angular integration using signals including inject functions API, plugins, and component patterns.

Setup

pnpm add @spoosh/core @spoosh/angular

import { Spoosh } from "@spoosh/core";
import { create } from "@spoosh/angular";

type ApiSchema = {
  users: {
    GET: { data: User[] };
    POST: { data: User; body: CreateUserBody };
  };
  "users/:id": {
    GET: { data: User };
    DELETE: { data: void };
  };
};

const spoosh = new Spoosh<ApiSchema, Error>("/api").use([
  cachePlugin(),
  retryPlugin(),
]);

export const { injectRead, injectWrite, injectPages, injectQueue } =
  create(spoosh);

Inject Functions API

injectRead

Fetch data with automatic caching and state management. Returns signals.

const users = injectRead((api) => api("users").GET(), {
  staleTime: 30000,
  enabled: true,
});

Returns (all signals except methods): data, loading, fetching, error, trigger(), abort(), meta

Options: enabled (supports Signal or function), tags, staleTime, retry, pollingInterval, refetch, debounce, transform, initialData

injectWrite

Perform mutations (POST, PUT, DELETE). Returns signals.

const createUser = injectWrite((api) => api("users").POST());

// Invalidation is AUTOMATIC - no need to specify in most cases!
await createUser.trigger({ body: { name, email } });

Returns (all signals except methods): trigger(), loading, error, data, meta, input, abort()

Trigger options: body, params, query, headers, invalidate, clearCache, optimistic

injectPages

Bidirectional pagination with infinite scroll. Returns signals.

const posts = injectPages((api) => api("posts").GET({ query: { page: 1 } }), {
  canFetchNext: ({ lastPage }) => lastPage?.data?.hasMore ?? false,
  nextPageRequest: ({ lastPage, request }) => ({
    query: { ...request.query, page: (lastPage?.data?.page ?? 0) + 1 },
  }),
  merger: (pages) => pages.flatMap((p) => p.data?.items ?? []),
});

Returns (all signals except methods): data, pages, loading, fetchingNext, canFetchNext, fetchNext(), fetchPrev(), trigger()

injectQueue

Queue management for batch operations with concurrency control.

const uploadQueue = injectQueue((api) => api("files").POST(), {
  concurrency: 3,
});

files.forEach((file) => uploadQueue.trigger({ body: form({ file }) }));

Returns (signals for tasks and stats): tasks, stats, trigger(), abort(), retry(), remove(), removeSettled(), clear(), setConcurrency()

Stats: pending, loading, settled, success, failed, total, percentage

Plugins

Cache Invalidation

IMPORTANT: Tags and invalidation are handled automatically! You rarely need to configure them manually.

• Tags: Auto-generated from the resolved URL path (e.g., api("users/:id").GET({ params: { id: 123 } }) → tag: "users/123")
• Invalidation: After mutations, automatically invalidates [firstSegment, firstSegment/*] pattern

// ✅ RECOMMENDED: Let Spoosh handle it automatically
await createUser.trigger({ body: data });
// POST users/123 → auto-invalidates ["users", "users/*"]

// Only override when you need specific behavior:
await createUser.trigger({ body: data, invalidate: "posts" }); // Exact match only
await createUser.trigger({ body: data, invalidate: "posts/*" }); // Children only
await createUser.trigger({ body: data, invalidate: ["posts", "users"] }); // Multiple patterns
await createUser.trigger({ body: data, invalidate: false }); // Disable invalidation
await createUser.trigger({ body: data, invalidate: "*" }); // Global refetch all

Custom tags on queries (when auto-generated tag doesn't fit your needs):

// Custom tag only - replaces auto-generated tag
users = injectRead((api) => api("users").GET(), {
  tags: "dashboard-users",
});

// Default path + custom tags (recommended for cross-cutting concerns)
stats = injectRead((api) => api("stats").GET(), {
  tags: ["stats", "sidebar-stats"], // Keep "stats" for auto-invalidation + add custom
});

// Then invalidate by either:
await createUser.trigger({ body: data, invalidate: "stats" }); // Path-based (auto works)
await createUser.trigger({ body: data, invalidate: "sidebar-stats" }); // Custom tag

Groups config for namespaced APIs (e.g., admin/posts, api/v1/users):

invalidationPlugin({
  groups: ["admin", "api/v1"], // These prefixes use deeper segment matching
});
// POST admin/posts → invalidates ["admin/posts", "admin/posts/*"] instead of ["admin", "admin/*"]

Component Patterns

Data Fetching

@Component({
  selector: "app-user-list",
  template: `
    @if (users.loading()) {
      <app-user-list-skeleton />
    } @else if (users.error()) {
      <app-error-message [error]="users.error()!" (retry)="users.trigger()" />
    } @else if (!users.data()?.length) {
      <app-empty-state message="No users found" />
    } @else {
      <ul>
        @for (user of users.data(); track user.id) {
          <app-user-card [user]="user" />
        }
      </ul>
    }
  `,
})
export class UserListComponent {
  users = injectRead((api) => api("users").GET(), { staleTime: 30000 });
}

Mutation Form

@Component({
  selector: "app-create-user-form",
  template: `
    <form (ngSubmit)="handleSubmit()">
      <input [(ngModel)]="name" name="name" [disabled]="createUser.loading()" />
      @if (createUser.error()) {
        <p class="error">{{ createUser.error()!.message }}</p>
      }
      <button [disabled]="createUser.loading()">
        {{ createUser.loading() ? "Creating..." : "Create" }}
      </button>
    </form>
  `,
})
export class CreateUserFormComponent {
  name = "";
  createUser = injectWrite((api) => api("users").POST());

  async handleSubmit() {
    // No need to specify invalidate - it's automatic!
    const result = await this.createUser.trigger({ body: { name: this.name } });
    if (result.data) this.name = "";
  }
}

Infinite Scroll

@Component({
  selector: "app-infinite-post-list",
  template: `
    @if (posts.loading()) {
      <app-post-list-skeleton />
    } @else {
      <div>
        @for (post of posts.data(); track post.id) {
          <app-post-card [post]="post" />
        }
        <div #loadTrigger>
          @if (posts.fetchingNext()) {
            <app-loading-spinner />
          }
        </div>
      </div>
    }
  `,
})
export class InfinitePostListComponent {
  loadTrigger = viewChild<ElementRef>("loadTrigger");

  posts = injectPages(
    (api) => api("posts").GET({ query: { page: 1, limit: 20 } }),
    {
      canFetchNext: ({ lastPage }) => lastPage?.data?.hasMore ?? false,
      nextPageRequest: ({ lastPage, request }) => ({
        query: { ...request.query, page: (lastPage?.data?.page ?? 0) + 1 },
      }),
      merger: (pages) => pages.flatMap((p) => p.data?.items ?? []),
    }
  );

  private observer?: IntersectionObserver;

  constructor() {
    effect(() => {
      const element = this.loadTrigger()?.nativeElement;
      if (element) {
        this.observer?.disconnect();
        this.observer = new IntersectionObserver(
          (entries) => {
            if (
              entries[0].isIntersecting &&
              this.posts.canFetchNext() &&
              !this.posts.fetchingNext()
            ) {
              this.posts.fetchNext();
            }
          },
          { threshold: 0.1 }
        );
        this.observer.observe(element);
      }
    });
  }
}

Optimistic Updates

@Component({
  selector: "app-toggle-like-button",
  template: `
    <button (click)="handleToggle()">
      {{ liked() ? "Unlike" : "Like" }} ({{ likeCount() }})
    </button>
  `,
})
export class ToggleLikeButtonComponent {
  postId = input.required<string>();
  liked = input.required<boolean>();
  likeCount = input.required<number>();

  toggleLike = injectWrite((api) => api("posts/:id/like").POST());

  handleToggle() {
    this.toggleLike.trigger({
      params: { id: this.postId() },
      optimistic: (cache) =>
        cache(`posts/${this.postId()}`).set((current) => ({
          ...current,
          liked: !this.liked(),
          likeCount: this.liked() ? this.likeCount() - 1 : this.likeCount() + 1,
        })),
    });
  }
}

Search with Debounce

@Component({
  selector: "app-search-users",
  template: `
    <div>
      <input
        [(ngModel)]="query"
        (ngModelChange)="searchQuery.set($event)"
        placeholder="Search..."
      />
      @if (searchResults.fetching()) {
        <app-loading-indicator />
      }
      @for (user of searchResults.data(); track user.id) {
        <li>{{ user.name }}</li>
      }
    </div>
  `,
})
export class SearchUsersComponent {
  query = "";
  searchQuery = signal("");

  searchResults = injectRead(
    (api) => api("users/search").GET({ query: { q: this.searchQuery() } }),
    { enabled: () => this.searchQuery().length >= 2, debounce: 300 }
  );
}

Polling

@Component({
  selector: "app-job-status",
  template: `<p>Status: {{ job.data()?.status }}</p>`,
})
export class JobStatusComponent {
  jobId = input.required<string>();

  job = injectRead(
    (api) => api("jobs/:id").GET({ params: { id: this.jobId() } }),
    {
      pollingInterval: ({ data }) => {
        if (data?.status === "completed" || data?.status === "failed")
          return false;
        return 2000;
      },
    }
  );
}

Server Type Inference

Hono

import { Spoosh, StripPrefix } from "@spoosh/core";
import type { HonoToSpoosh } from "@spoosh/hono";

// Server: app.basePath("/api")
type FullSchema = HonoToSpoosh<typeof app>;
type ApiSchema = StripPrefix<FullSchema, "api">; // Avoid double /api/api

const spoosh = new Spoosh<ApiSchema, Error>("/api");

Elysia

import { Spoosh, StripPrefix } from "@spoosh/core";
import type { ElysiaToSpoosh } from "@spoosh/elysia";

// Server: new Elysia({ prefix: "/api" })
type FullSchema = ElysiaToSpoosh<typeof app>;
type ApiSchema = StripPrefix<FullSchema, "api">; // Avoid double /api/api

const spoosh = new Spoosh<ApiSchema, Error>("/api");

Use StripPrefix when your baseUrl includes the same prefix as the server's basePath to prevent double prefixing (e.g., /api/api/users).

OpenAPI

# Export TypeScript → OpenAPI
npx spoosh-openapi export --schema ./schema.ts --output openapi.json

# Import OpenAPI → TypeScript
npx spoosh-openapi import openapi.json --output ./schema.ts

References

For detailed API documentation:

• references/signals-api.md - Complete inject function signatures
• references/plugins-api.md - All plugin configurations
• references/advanced-patterns.md - Complex patterns and edge cases

If more detail needed, fetch https://spoosh.dev/docs/angular/llms (or /llms-full for complete docs).