Variable FetchManagerConst

Type Declaration

• fetch: function

  • fetch(resource: FetchResource, options?: FetchOptions): Promise<FetchResult>

    Fetch and parse a resource

    Parameters

    • resource: FetchResource

      Resource to fetch

      • url

        Resource URL

      • type

        Resource type (tile, icon, config, etc)

      • optional

        Is optional

    • Optionaloptions: FetchOptions = {}

      Fetch options

      • signal

        Abort signal

    Returns Promise<FetchResult>

    Parsed resource with metadata

    Throws

    If fetch fails (unless optional and 404)

    Example

    const resource = {
      url: 'https://example.com/icon.svg',
      type: 'icon'
    };
    const result = await FetchManager.fetch(resource);
    // result = { data, size, metadata }
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• fetchAll: function

  • fetchAll(
        resources: FetchResource[],
        options?: {
            concurrency?: number;
            signal?: AbortSignal;
            onResource?: (
                r: FetchResource,
                result: FetchResult | null,
                error: unknown,
            ) => void;
        },
    ): Promise<
        { resource: FetchResource; result?: FetchResult; error?: unknown }[],
    >

    Fetch multiple resources in parallel with worker pool

    Parameters

    • resources: FetchResource[]

      Resources to fetch

    • options: {
          concurrency?: number;
          signal?: AbortSignal;
          onResource?: (
              r: FetchResource,
              result: FetchResult | null,
              error: unknown,
          ) => void;
      } = {}

      Options

      • Optionalconcurrency?: number

        Number of concurrent workers

      • Optionalsignal?: AbortSignal

        Abort signal

      • OptionalonResource?: (r: FetchResource, result: FetchResult | null, error: unknown) => void

        Callback per resource (resource, result, error)

    Returns Promise<{ resource: FetchResource; result?: FetchResult; error?: unknown }[]>

    Fetch results

    Example

    const results = await FetchManager.fetchAll(resources, {
      concurrency: 5,
      onResource: (resource, result, error) => {
        console.log(resource.url, result ? 'OK' : error);
      }
    });
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• isModified: function

  • isModified(
        url: string,
        cachedMetadata: { etag?: string | null; lastModified?: string | null },
        options?: { signal?: AbortSignal },
    ): Promise<boolean>

    Check if resource has been modified (using ETag/Last-Modified)

    Parameters

    • url: string

      Resource URL

    • cachedMetadata: { etag?: string | null; lastModified?: string | null }

      Cached metadata

    • Optionaloptions: { signal?: AbortSignal } = {}

      Options

      • Optionalsignal?: AbortSignal

        Abort signal

    Returns Promise<boolean>

    True if modified