Function createResource

packages/react-devtools-shared/src/devtools/cache.js:123–187

(
  fetch: Input => Thenable<Value>,
  hashInput: Input => Key,
  config?: Config = {},
)

}

export function createResource<Input, Key, Value>(
  fetch: Input => Thenable<Value>,
  hashInput: Input => Key,
  config?: Config = {},
): Resource<Input, Key, Value> {
  const resource = {
    clear(): void {
      entries.delete(resource);
    },

    invalidate(key: Key): void {
      const entriesForResource = getEntriesForResource(resource);
      entriesForResource.delete(key);
    },

    read(input: Input): Value {
      // Prevent access outside of render.
      readContext(CacheContext);

      const key = hashInput(input);
      const result: Thenable<Value> = accessResult(resource, fetch, input, key);
      if (typeof React.use === 'function') {
        // eslint-disable-next-line react-hooks-published/rules-of-hooks
        return React.use(result);
      }

      switch (result.status) {
        case 'fulfilled': {
          const value = result.value;
          return value;
        }
        case 'rejected': {
          const error = result.reason;
          throw error;
        }
        default:
          throw result;
      }
    },

    preload(input: Input): void {
      // Prevent access outside of render.
      readContext(CacheContext);

      const key = hashInput(input);
      accessResult(resource, fetch, input, key);
    },

    write(key: Key, value: Value): void {
      const entriesForResource = getEntriesForResource(resource);

      const fulfilledThenable: FulfilledThenable<Value> = (Promise.resolve(
        value,
      ): any);
      fulfilledThenable.status = 'fulfilled';
      fulfilledThenable.value = value;

      entriesForResource.set(key, fulfilledThenable);