visgl / loaders.gl / 20352100062

// loaders.gl

// SPDX-License-Identifier: MIT

// Copyright (c) vis.gl contributors

import type {LoaderOptions} from '@loaders.gl/loader-utils';

/**

 * Gets the current fetch function from options

 * @todo - move to loader-utils module

 * @todo - use in core module counterpart

 * @param options

 * @param context

 */

export function getFetchFunction(options?: LoaderOptions) {

  const fetchFunction = options?.core?.fetch;

  // options.fetch can be a function

  if (fetchFunction && typeof fetchFunction === 'function') {

    return (url: string, fetchOptions?: RequestInit) => fetchFunction(url, fetchOptions);

  }

  // options.fetch can be an options object, use global fetch with those options

  const fetchOptions = options?.fetch;

  if (fetchOptions && typeof fetchOptions !== 'function') {

    return (url) => fetch(url, fetchOptions);

  }

  // else return the global fetch function

  return (url) => fetch(url);

}

export function mergeImageSourceLoaderProps<Props extends {loadOptions?: any}>(

  props: Props

): Required<Props> {

  // @ts-expect-error

  return {

    // Default fetch

    ...props,

    loadOptions: {

      ...props.loadOptions,

      fetch: getFetchFunction(props.loadOptions)

    }

  };

}