source/library/state/schema.svelte.ts


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/*** IMPORT ------------------------------------------- ***/

import {
  buildClientSchema,
  getIntrospectionQuery,
  printSchema,
  type GraphQLSchema,
  type IntrospectionQuery
} from "graphql";

/*** UTILITY ------------------------------------------ ***/

import type { Fetcher } from "../fetcher/types.ts";

/*** EXPORT ------------------------------------------- ***/

export class SchemaStore {
  error = $state<string | null>(null);
  loading = $state(false);
  schema = $state<GraphQLSchema | null>(null);
  sdl = $state<string>("");

  async introspect(fetcher: Fetcher) {
    this.loading = true;
    this.error = null;

    try {
      const result = await fetcher({ query: getIntrospectionQuery() });
      const data = (result as { data: IntrospectionQuery }).data;
      this.schema = buildClientSchema(data);
      this.sdl = printSchema(this.schema);
    } catch(err) {
      this.error = String(err);
    } finally {
      this.loading = false;
    }
  }
}