@loaders.gl/loader-utils/dist/index.cjs

Framework-independent loaders for 3D graphics formats

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var __publicField = (obj, key, value) => {
  __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value);
  return value;
};

// dist/index.js
var dist_exports = {};
__export(dist_exports, {
  BlobFile: () => BlobFile,
  DataSource: () => DataSource,
  DataViewFile: () => DataViewFile,
  FileHandleFile: () => FileHandleFile,
  FileProvider: () => FileProvider,
  HttpFile: () => HttpFile,
  ImageSource: () => ImageSource,
  JSONLoader: () => JSONLoader,
  NodeFile: () => NodeFileFacade,
  NodeFilesystem: () => NodeFileSystemFacade,
  RequestScheduler: () => RequestScheduler,
  VectorSource: () => VectorSource,
  _addAliases: () => addAliases,
  assert: () => assert,
  canEncodeWithWorker: () => canEncodeWithWorker,
  canParseWithWorker: () => canParseWithWorker,
  checkJSModule: () => checkJSModule,
  compareArrayBuffers: () => compareArrayBuffers,
  concatenateArrayBuffers: () => concatenateArrayBuffers,
  concatenateArrayBuffersAsync: () => concatenateArrayBuffersAsync,
  concatenateArrayBuffersFromArray: () => concatenateArrayBuffersFromArray,
  concatenateTypedArrays: () => concatenateTypedArrays,
  copyArrayBuffer: () => copyArrayBuffer,
  copyBinaryToDataView: () => copyBinaryToDataView,
  copyPaddedArrayBufferToDataView: () => copyPaddedArrayBufferToDataView,
  copyPaddedStringToDataView: () => copyPaddedStringToDataView,
  copyStringToDataView: () => copyStringToDataView,
  copyToArray: () => copyToArray,
  createLoaderWorker: () => createLoaderWorker,
  document: () => document_,
  forEach: () => forEach,
  getFirstCharacters: () => getFirstCharacters,
  getJSModule: () => getJSModule,
  getJSModuleOrNull: () => getJSModuleOrNull,
  getMagicString: () => getMagicString,
  getPathPrefix: () => getPathPrefix,
  global: () => global_,
  isBrowser: () => isBrowser,
  isBuffer: () => isBuffer,
  isFileProvider: () => isFileProvider,
  isWorker: () => isWorker,
  log: () => log,
  makeLineIterator: () => makeLineIterator,
  makeNumberedLineIterator: () => makeNumberedLineIterator,
  makeTextDecoderIterator: () => makeTextDecoderIterator,
  makeTextEncoderIterator: () => makeTextEncoderIterator,
  mergeLoaderOptions: () => mergeLoaderOptions,
  nodeVersion: () => nodeVersion,
  padStringToByteAlignment: () => padStringToByteAlignment,
  padToNBytes: () => padToNBytes,
  parseFromContext: () => parseFromContext,
  parseInBatchesFromContext: () => parseInBatchesFromContext,
  parseJSON: () => parseJSON,
  parseSyncFromContext: () => parseSyncFromContext,
  parseWithWorker: () => parseWithWorker,
  path: () => path_exports,
  promisify1: () => promisify1,
  promisify2: () => promisify2,
  registerJSModules: () => registerJSModules,
  resolvePath: () => resolvePath,
  self: () => self_,
  setPathPrefix: () => setPathPrefix,
  sliceArrayBuffer: () => sliceArrayBuffer,
  stream: () => stream_browser_exports,
  toArrayBuffer: () => toArrayBuffer2,
  toBuffer: () => toBuffer2,
  window: () => window_
});
module.exports = __toCommonJS(dist_exports);

// dist/loader-types.js
async function parseFromContext(data, loaders, options, context) {
  return context._parse(data, loaders, options, context);
}
function parseSyncFromContext(data, loader, options, context) {
  if (!context._parseSync) {
    throw new Error("parseSync");
  }
  return context._parseSync(data, loader, options, context);
}
async function parseInBatchesFromContext(data, loader, options, context) {
  if (!context._parseInBatches) {
    throw new Error("parseInBatches");
  }
  return context._parseInBatches(data, loader, options, context);
}

// dist/lib/env-utils/assert.js
function assert(condition, message) {
  if (!condition) {
    throw new Error(message || "loader assertion failed.");
  }
}

// dist/lib/env-utils/globals.js
var globals = {
  self: typeof self !== "undefined" && self,
  window: typeof window !== "undefined" && window,
  global: typeof global !== "undefined" && global,
  document: typeof document !== "undefined" && document
};
var self_ = globals.self || globals.window || globals.global || {};
var window_ = globals.window || globals.self || globals.global || {};
var global_ = globals.global || globals.self || globals.window || {};
var document_ = globals.document || {};
var isBrowser = (
  // @ts-ignore process does not exist on browser
  Boolean(typeof process !== "object" || String(process) !== "[object process]" || process.browser)
);
var isWorker = typeof importScripts === "function";
var matches = typeof process !== "undefined" && process.version && /v([0-9]*)/.exec(process.version);
var nodeVersion = matches && parseFloat(matches[1]) || 0;

// dist/lib/log-utils/log.js
var import_log = require("@probe.gl/log");
var VERSION = true ? "4.3.2" : "latest";
var version = VERSION[0] >= "0" && VERSION[0] <= "9" ? `v${VERSION}` : "";
function createLog() {
  const log2 = new import_log.Log({ id: "loaders.gl" });
  globalThis.loaders = globalThis.loaders || {};
  globalThis.loaders.log = log2;
  globalThis.loaders.version = version;
  globalThis.probe = globalThis.probe || {};
  globalThis.probe.loaders = log2;
  return log2;
}
var log = createLog();

// dist/lib/option-utils/merge-loader-options.js
function mergeLoaderOptions(baseOptions, newOptions) {
  return mergeOptionsRecursively(baseOptions || {}, newOptions);
}
function mergeOptionsRecursively(baseOptions, newOptions, level = 0) {
  if (level > 3) {
    return newOptions;
  }
  const options = { ...baseOptions };
  for (const [key, newValue] of Object.entries(newOptions)) {
    if (newValue && typeof newValue === "object" && !Array.isArray(newValue)) {
      options[key] = mergeOptionsRecursively(options[key] || {}, newOptions[key], level + 1);
    } else {
      options[key] = newOptions[key];
    }
  }
  return options;
}

// dist/lib/module-utils/js-module-utils.js
function registerJSModules(modules) {
  globalThis.loaders ||= {};
  globalThis.loaders.modules ||= {};
  Object.assign(globalThis.loaders.modules, modules);
}
function checkJSModule(name, caller) {
  var _a, _b;
  const module2 = (_b = (_a = globalThis.loaders) == null ? void 0 : _a.modules) == null ? void 0 : _b[name];
  if (!module2) {
    log.warn(`${caller}: ${name} library not installed`)();
  }
}
function getJSModule(name, caller) {
  var _a, _b;
  const module2 = (_b = (_a = globalThis.loaders) == null ? void 0 : _a.modules) == null ? void 0 : _b[name];
  if (!module2) {
    throw new Error(`${caller}: ${name} library not installed`);
  }
  return module2;
}
function getJSModuleOrNull(name) {
  var _a, _b;
  const module2 = (_b = (_a = globalThis.loaders) == null ? void 0 : _a.modules) == null ? void 0 : _b[name];
  return module2 || null;
}

// dist/lib/worker-loader-utils/create-loader-worker.js
var import_worker_utils = require("@loaders.gl/worker-utils");
var requestId = 0;
async function createLoaderWorker(loader) {
  if (!await import_worker_utils.WorkerBody.inWorkerThread()) {
    return;
  }
  import_worker_utils.WorkerBody.onmessage = async (type, payload) => {
    switch (type) {
      case "process":
        try {
          const { input, options = {}, context = {} } = payload;
          const result = await parseData({
            loader,
            arrayBuffer: input,
            options,
            // @ts-expect-error fetch missing
            context: {
              ...context,
              _parse: parseOnMainThread
            }
          });
          import_worker_utils.WorkerBody.postMessage("done", { result });
        } catch (error) {
          const message = error instanceof Error ? error.message : "";
          import_worker_utils.WorkerBody.postMessage("error", { error: message });
        }
        break;
      default:
    }
  };
}
function parseOnMainThread(arrayBuffer, loader, options, context) {
  return new Promise((resolve2, reject) => {
    const id = requestId++;
    const onMessage2 = (type, payload2) => {
      if (payload2.id !== id) {
        return;
      }
      switch (type) {
        case "done":
          import_worker_utils.WorkerBody.removeEventListener(onMessage2);
          resolve2(payload2.result);
          break;
        case "error":
          import_worker_utils.WorkerBody.removeEventListener(onMessage2);
          reject(payload2.error);
          break;
        default:
      }
    };
    import_worker_utils.WorkerBody.addEventListener(onMessage2);
    const payload = { id, input: arrayBuffer, options };
    import_worker_utils.WorkerBody.postMessage("process", payload);
  });
}
async function parseData({ loader, arrayBuffer, options, context }) {
  let data;
  let parser;
  if (loader.parseSync || loader.parse) {
    data = arrayBuffer;
    parser = loader.parseSync || loader.parse;
  } else if (loader.parseTextSync) {
    const textDecoder = new TextDecoder();
    data = textDecoder.decode(arrayBuffer);
    parser = loader.parseTextSync;
  } else {
    throw new Error(`Could not load data with ${loader.name} loader`);
  }
  options = {
    ...options,
    modules: loader && loader.options && loader.options.modules || {},
    worker: false
  };
  return await parser(data, { ...options }, context, loader);
}

// dist/lib/worker-loader-utils/parse-with-worker.js
var import_worker_utils2 = require("@loaders.gl/worker-utils");
function canParseWithWorker(loader, options) {
  if (!import_worker_utils2.WorkerFarm.isSupported()) {
    return false;
  }
  if (!import_worker_utils2.isBrowser && !(options == null ? void 0 : options._nodeWorkers)) {
    return false;
  }
  return loader.worker && (options == null ? void 0 : options.worker);
}
async function parseWithWorker(loader, data, options, context, parseOnMainThread2) {
  const name = loader.id;
  const url = (0, import_worker_utils2.getWorkerURL)(loader, options);
  const workerFarm = import_worker_utils2.WorkerFarm.getWorkerFarm(options);
  const workerPool = workerFarm.getWorkerPool({ name, url });
  options = JSON.parse(JSON.stringify(options));
  context = JSON.parse(JSON.stringify(context || {}));
  const job = await workerPool.startJob(
    "process-on-worker",
    // @ts-expect-error
    onMessage.bind(null, parseOnMainThread2)
    // eslint-disable-line @typescript-eslint/no-misused-promises
  );
  job.postMessage("process", {
    // @ts-ignore
    input: data,
    options,
    context
  });
  const result = await job.result;
  return await result.result;
}
async function onMessage(parseOnMainThread2, job, type, payload) {
  switch (type) {
    case "done":
      job.done(payload);
      break;
    case "error":
      job.error(new Error(payload.error));
      break;
    case "process":
      const { id, input, options } = payload;
      try {
        const result = await parseOnMainThread2(input, options);
        job.postMessage("done", { id, result });
      } catch (error) {
        const message = error instanceof Error ? error.message : "unknown error";
        job.postMessage("error", { id, error: message });
      }
      break;
    default:
      console.warn(`parse-with-worker unknown message ${type}`);
  }
}

// dist/lib/worker-loader-utils/encode-with-worker.js
var import_worker_utils3 = require("@loaders.gl/worker-utils");
function canEncodeWithWorker(writer, options) {
  if (!import_worker_utils3.WorkerFarm.isSupported()) {
    return false;
  }
  if (!isBrowser && !(options == null ? void 0 : options._nodeWorkers)) {
    return false;
  }
  return writer.worker && (options == null ? void 0 : options.worker);
}

// dist/lib/binary-utils/get-first-characters.js
function getFirstCharacters(data, length = 5) {
  if (typeof data === "string") {
    return data.slice(0, length);
  } else if (ArrayBuffer.isView(data)) {
    return getMagicString(data.buffer, data.byteOffset, length);
  } else if (data instanceof ArrayBuffer) {
    const byteOffset = 0;
    return getMagicString(data, byteOffset, length);
  }
  return "";
}
function getMagicString(arrayBuffer, byteOffset, length) {
  if (arrayBuffer.byteLength <= byteOffset + length) {
    return "";
  }
  const dataView = new DataView(arrayBuffer);
  let magic = "";
  for (let i = 0; i < length; i++) {
    magic += String.fromCharCode(dataView.getUint8(byteOffset + i));
  }
  return magic;
}

// dist/lib/parser-utils/parse-json.js
function parseJSON(string) {
  try {
    return JSON.parse(string);
  } catch (_) {
    throw new Error(`Failed to parse JSON from data starting with "${getFirstCharacters(string)}"`);
  }
}

// dist/lib/binary-utils/array-buffer-utils.js
function compareArrayBuffers(arrayBuffer1, arrayBuffer2, byteLength) {
  byteLength = byteLength || arrayBuffer1.byteLength;
  if (arrayBuffer1.byteLength < byteLength || arrayBuffer2.byteLength < byteLength) {
    return false;
  }
  const array1 = new Uint8Array(arrayBuffer1);
  const array2 = new Uint8Array(arrayBuffer2);
  for (let i = 0; i < array1.length; ++i) {
    if (array1[i] !== array2[i]) {
      return false;
    }
  }
  return true;
}
function concatenateArrayBuffers(...sources) {
  return concatenateArrayBuffersFromArray(sources);
}
function concatenateArrayBuffersFromArray(sources) {
  const sourceArrays = sources.map((source2) => source2 instanceof ArrayBuffer ? new Uint8Array(source2) : source2);
  const byteLength = sourceArrays.reduce((length, typedArray) => length + typedArray.byteLength, 0);
  const result = new Uint8Array(byteLength);
  let offset = 0;
  for (const sourceArray of sourceArrays) {
    result.set(sourceArray, offset);
    offset += sourceArray.byteLength;
  }
  return result.buffer;
}
function concatenateTypedArrays(...typedArrays) {
  const arrays = typedArrays;
  const TypedArrayConstructor = arrays && arrays.length > 1 && arrays[0].constructor || null;
  if (!TypedArrayConstructor) {
    throw new Error('"concatenateTypedArrays" - incorrect quantity of arguments or arguments have incompatible data types');
  }
  const sumLength = arrays.reduce((acc, value) => acc + value.length, 0);
  const result = new TypedArrayConstructor(sumLength);
  let offset = 0;
  for (const array of arrays) {
    result.set(array, offset);
    offset += array.length;
  }
  return result;
}
function sliceArrayBuffer(arrayBuffer, byteOffset, byteLength) {
  const subArray = byteLength !== void 0 ? new Uint8Array(arrayBuffer).subarray(byteOffset, byteOffset + byteLength) : new Uint8Array(arrayBuffer).subarray(byteOffset);
  const arrayCopy = new Uint8Array(subArray);
  return arrayCopy.buffer;
}

// dist/lib/binary-utils/memory-copy-utils.js
function padToNBytes(byteLength, padding) {
  assert(byteLength >= 0);
  assert(padding > 0);
  return byteLength + (padding - 1) & ~(padding - 1);
}
function copyArrayBuffer(targetBuffer, sourceBuffer, byteOffset, byteLength = sourceBuffer.byteLength) {
  const targetArray = new Uint8Array(targetBuffer, byteOffset, byteLength);
  const sourceArray = new Uint8Array(sourceBuffer);
  targetArray.set(sourceArray);
  return targetBuffer;
}
function copyToArray(source, target, targetOffset) {
  let sourceArray;
  if (source instanceof ArrayBuffer) {
    sourceArray = new Uint8Array(source);
  } else {
    const srcByteOffset = source.byteOffset;
    const srcByteLength = source.byteLength;
    sourceArray = new Uint8Array(source.buffer || source.arrayBuffer, srcByteOffset, srcByteLength);
  }
  target.set(sourceArray, targetOffset);
  return targetOffset + padToNBytes(sourceArray.byteLength, 4);
}

// dist/lib/binary-utils/dataview-copy-utils.js
function padStringToByteAlignment(string, byteAlignment) {
  const length = string.length;
  const paddedLength = Math.ceil(length / byteAlignment) * byteAlignment;
  const padding = paddedLength - length;
  let whitespace = "";
  for (let i = 0; i < padding; ++i) {
    whitespace += " ";
  }
  return string + whitespace;
}
function copyStringToDataView(dataView, byteOffset, string, byteLength) {
  if (dataView) {
    for (let i = 0; i < byteLength; i++) {
      dataView.setUint8(byteOffset + i, string.charCodeAt(i));
    }
  }
  return byteOffset + byteLength;
}
function copyBinaryToDataView(dataView, byteOffset, binary, byteLength) {
  if (dataView) {
    for (let i = 0; i < byteLength; i++) {
      dataView.setUint8(byteOffset + i, binary[i]);
    }
  }
  return byteOffset + byteLength;
}
function copyPaddedArrayBufferToDataView(dataView, byteOffset, sourceBuffer, padding) {
  const paddedLength = padToNBytes(sourceBuffer.byteLength, padding);
  const padLength = paddedLength - sourceBuffer.byteLength;
  if (dataView) {
    const targetArray = new Uint8Array(dataView.buffer, dataView.byteOffset + byteOffset, sourceBuffer.byteLength);
    const sourceArray = new Uint8Array(sourceBuffer);
    targetArray.set(sourceArray);
    for (let i = 0; i < padLength; ++i) {
      dataView.setUint8(byteOffset + sourceBuffer.byteLength + i, 32);
    }
  }
  byteOffset += paddedLength;
  return byteOffset;
}
function copyPaddedStringToDataView(dataView, byteOffset, string, padding) {
  const textEncoder = new TextEncoder();
  const stringBuffer = textEncoder.encode(string);
  byteOffset = copyPaddedArrayBufferToDataView(dataView, byteOffset, stringBuffer, padding);
  return byteOffset;
}

// dist/lib/iterators/text-iterators.js
async function* makeTextDecoderIterator(arrayBufferIterator, options = {}) {
  const textDecoder = new TextDecoder(void 0, options);
  for await (const arrayBuffer of arrayBufferIterator) {
    yield typeof arrayBuffer === "string" ? arrayBuffer : textDecoder.decode(arrayBuffer, { stream: true });
  }
}
async function* makeTextEncoderIterator(textIterator) {
  const textEncoder = new TextEncoder();
  for await (const text of textIterator) {
    yield typeof text === "string" ? textEncoder.encode(text) : text;
  }
}
async function* makeLineIterator(textIterator) {
  let previous = "";
  for await (const textChunk of textIterator) {
    previous += textChunk;
    let eolIndex;
    while ((eolIndex = previous.indexOf("\n")) >= 0) {
      const line = previous.slice(0, eolIndex + 1);
      previous = previous.slice(eolIndex + 1);
      yield line;
    }
  }
  if (previous.length > 0) {
    yield previous;
  }
}
async function* makeNumberedLineIterator(lineIterator) {
  let counter = 1;
  for await (const line of lineIterator) {
    yield { counter, line };
    counter++;
  }
}

// dist/lib/iterators/async-iteration.js
async function forEach(iterator, visitor) {
  while (true) {
    const { done, value } = await iterator.next();
    if (done) {
      iterator.return();
      return;
    }
    const cancel = visitor(value);
    if (cancel) {
      return;
    }
  }
}
async function concatenateArrayBuffersAsync(asyncIterator) {
  const arrayBuffers = [];
  for await (const chunk of asyncIterator) {
    arrayBuffers.push(chunk);
  }
  return concatenateArrayBuffers(...arrayBuffers);
}

// dist/lib/request-utils/request-scheduler.js
var import_stats = require("@probe.gl/stats");
var STAT_QUEUED_REQUESTS = "Queued Requests";
var STAT_ACTIVE_REQUESTS = "Active Requests";
var STAT_CANCELLED_REQUESTS = "Cancelled Requests";
var STAT_QUEUED_REQUESTS_EVER = "Queued Requests Ever";
var STAT_ACTIVE_REQUESTS_EVER = "Active Requests Ever";
var DEFAULT_PROPS = {
  id: "request-scheduler",
  /** Specifies if the request scheduler should throttle incoming requests, mainly for comparative testing. */
  throttleRequests: true,
  /** The maximum number of simultaneous active requests. Un-throttled requests do not observe this limit. */
  maxRequests: 6,
  /**
   * Specifies a debounce time, in milliseconds. All requests are queued, until no new requests have
   * been added to the queue for this amount of time.
   */
  debounceTime: 0
};
var RequestScheduler = class {
  props;
  stats;
  activeRequestCount = 0;
  /** Tracks the number of active requests and prioritizes/cancels queued requests. */
  requestQueue = [];
  requestMap = /* @__PURE__ */ new Map();
  updateTimer = null;
  constructor(props = {}) {
    this.props = { ...DEFAULT_PROPS, ...props };
    this.stats = new import_stats.Stats({ id: this.props.id });
    this.stats.get(STAT_QUEUED_REQUESTS);
    this.stats.get(STAT_ACTIVE_REQUESTS);
    this.stats.get(STAT_CANCELLED_REQUESTS);
    this.stats.get(STAT_QUEUED_REQUESTS_EVER);
    this.stats.get(STAT_ACTIVE_REQUESTS_EVER);
  }
  /**
   * Called by an application that wants to issue a request, without having it deeply queued by the browser
   *
   * When the returned promise resolved, it is OK for the application to issue a request.
   * The promise resolves to an object that contains a `done` method.
   * When the application's request has completed (or failed), the application must call the `done` function
   *
   * @param handle
   * @param getPriority will be called when request "slots" open up,
   *    allowing the caller to update priority or cancel the request
   *    Highest priority executes first, priority < 0 cancels the request
   * @returns a promise
   *   - resolves to a object (with a `done` field) when the request can be issued without queueing,
   *   - resolves to `null` if the request has been cancelled (by the callback return < 0).
   *     In this case the application should not issue the request
   */
  scheduleRequest(handle, getPriority = () => 0) {
    if (!this.props.throttleRequests) {
      return Promise.resolve({ done: () => {
      } });
    }
    if (this.requestMap.has(handle)) {
      return this.requestMap.get(handle);
    }
    const request = { handle, priority: 0, getPriority };
    const promise = new Promise((resolve2) => {
      request.resolve = resolve2;
      return request;
    });
    this.requestQueue.push(request);
    this.requestMap.set(handle, promise);
    this._issueNewRequests();
    return promise;
  }
  // PRIVATE
  _issueRequest(request) {
    const { handle, resolve: resolve2 } = request;
    let isDone = false;
    const done = () => {
      if (!isDone) {
        isDone = true;
        this.requestMap.delete(handle);
        this.activeRequestCount--;
        this._issueNewRequests();
      }
    };
    this.activeRequestCount++;
    return resolve2 ? resolve2({ done }) : Promise.resolve({ done });
  }
  /** We check requests asynchronously, to prevent multiple updates */
  _issueNewRequests() {
    if (this.updateTimer !== null) {
      clearTimeout(this.updateTimer);
    }
    this.updateTimer = setTimeout(() => this._issueNewRequestsAsync(), this.props.debounceTime);
  }
  /** Refresh all requests  */
  _issueNewRequestsAsync() {
    if (this.updateTimer !== null) {
      clearTimeout(this.updateTimer);
    }
    this.updateTimer = null;
    const freeSlots = Math.max(this.props.maxRequests - this.activeRequestCount, 0);
    if (freeSlots === 0) {
      return;
    }
    this._updateAllRequests();
    for (let i = 0; i < freeSlots; ++i) {
      const request = this.requestQueue.shift();
      if (request) {
        this._issueRequest(request);
      }
    }
  }
  /** Ensure all requests have updated priorities, and that no longer valid requests are cancelled */
  _updateAllRequests() {
    const requestQueue = this.requestQueue;
    for (let i = 0; i < requestQueue.length; ++i) {
      const request = requestQueue[i];
      if (!this._updateRequest(request)) {
        requestQueue.splice(i, 1);
        this.requestMap.delete(request.handle);
        i--;
      }
    }
    requestQueue.sort((a, b) => a.priority - b.priority);
  }
  /** Update a single request by calling the callback */
  _updateRequest(request) {
    request.priority = request.getPriority(request.handle);
    if (request.priority < 0) {
      request.resolve(null);
      return false;
    }
    return true;
  }
};

// dist/lib/path-utils/file-aliases.js
var pathPrefix = "";
var fileAliases = {};
function setPathPrefix(prefix) {
  pathPrefix = prefix;
}
function getPathPrefix() {
  return pathPrefix;
}
function addAliases(aliases) {
  Object.assign(fileAliases, aliases);
}
function resolvePath(filename2) {
  for (const alias in fileAliases) {
    if (filename2.startsWith(alias)) {
      const replacement = fileAliases[alias];
      filename2 = filename2.replace(alias, replacement);
    }
  }
  if (!filename2.startsWith("http://") && !filename2.startsWith("https://")) {
    filename2 = `${pathPrefix}${filename2}`;
  }
  return filename2;
}

// dist/json-loader.js
var VERSION2 = true ? "4.3.2" : "latest";
var JSONLoader = {
  dataType: null,
  batchType: null,
  name: "JSON",
  id: "json",
  module: "json",
  version: VERSION2,
  extensions: ["json", "geojson"],
  mimeTypes: ["application/json"],
  category: "json",
  text: true,
  parseTextSync,
  parse: async (arrayBuffer) => parseTextSync(new TextDecoder().decode(arrayBuffer)),
  options: {}
};
function parseTextSync(text) {
  return JSON.parse(text);
}

// dist/lib/node/buffer.browser.js
function toArrayBuffer(buffer) {
  return buffer;
}
function toBuffer(binaryData) {
  throw new Error("Buffer not supported in browser");
}

// dist/lib/binary-utils/memory-conversion-utils.js
function isBuffer(value) {
  return value && typeof value === "object" && value.isBuffer;
}
function toBuffer2(data) {
  return toBuffer ? toBuffer(data) : data;
}
function toArrayBuffer2(data) {
  if (isBuffer(data)) {
    return toArrayBuffer(data);
  }
  if (data instanceof ArrayBuffer) {
    return data;
  }
  if (ArrayBuffer.isView(data)) {
    if (data.byteOffset === 0 && data.byteLength === data.buffer.byteLength) {
      return data.buffer;
    }
    return data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength);
  }
  if (typeof data === "string") {
    const text = data;
    const uint8Array = new TextEncoder().encode(text);
    return uint8Array.buffer;
  }
  if (data && typeof data === "object" && data._toArrayBuffer) {
    return data._toArrayBuffer();
  }
  throw new Error("toArrayBuffer");
}

// dist/lib/node/promisify.js
function promisify1(fn) {
  return (args) => new Promise((resolve2, reject) => fn(args, (error, callbackArgs) => error ? reject(error) : resolve2(callbackArgs)));
}
function promisify2(fn) {
  return (arg1, arg2) => new Promise((resolve2, reject) => fn(arg1, arg2, (error, callbackArgs) => error ? reject(error) : resolve2(callbackArgs)));
}

// dist/lib/path-utils/path.js
var path_exports = {};
__export(path_exports, {
  dirname: () => dirname,
  filename: () => filename,
  join: () => join,
  resolve: () => resolve
});

// dist/lib/path-utils/get-cwd.js
function getCWD() {
  var _a;
  if (typeof process !== "undefined" && typeof process.cwd !== "undefined") {
    return process.cwd();
  }
  const pathname = (_a = window.location) == null ? void 0 : _a.pathname;
  return (pathname == null ? void 0 : pathname.slice(0, pathname.lastIndexOf("/") + 1)) || "";
}

// dist/lib/path-utils/path.js
function filename(url) {
  const slashIndex = url ? url.lastIndexOf("/") : -1;
  return slashIndex >= 0 ? url.substr(slashIndex + 1) : "";
}
function dirname(url) {
  const slashIndex = url ? url.lastIndexOf("/") : -1;
  return slashIndex >= 0 ? url.substr(0, slashIndex) : "";
}
function join(...parts) {
  const separator = "/";
  parts = parts.map((part, index) => {
    if (index) {
      part = part.replace(new RegExp(`^${separator}`), "");
    }
    if (index !== parts.length - 1) {
      part = part.replace(new RegExp(`${separator}$`), "");
    }
    return part;
  });
  return parts.join(separator);
}
function resolve(...components) {
  const paths = [];
  for (let _i = 0; _i < components.length; _i++) {
    paths[_i] = components[_i];
  }
  let resolvedPath = "";
  let resolvedAbsolute = false;
  let cwd;
  for (let i = paths.length - 1; i >= -1 && !resolvedAbsolute; i--) {
    let path;
    if (i >= 0) {
      path = paths[i];
    } else {
      if (cwd === void 0) {
        cwd = getCWD();
      }
      path = cwd;
    }
    if (path.length === 0) {
      continue;
    }
    resolvedPath = `${path}/${resolvedPath}`;
    resolvedAbsolute = path.charCodeAt(0) === SLASH;
  }
  resolvedPath = normalizeStringPosix(resolvedPath, !resolvedAbsolute);
  if (resolvedAbsolute) {
    return `/${resolvedPath}`;
  } else if (resolvedPath.length > 0) {
    return resolvedPath;
  }
  return ".";
}
var SLASH = 47;
var DOT = 46;
function normalizeStringPosix(path, allowAboveRoot) {
  let res = "";
  let lastSlash = -1;
  let dots = 0;
  let code;
  let isAboveRoot = false;
  for (let i = 0; i <= path.length; ++i) {
    if (i < path.length) {
      code = path.charCodeAt(i);
    } else if (code === SLASH) {
      break;
    } else {
      code = SLASH;
    }
    if (code === SLASH) {
      if (lastSlash === i - 1 || dots === 1) {
      } else if (lastSlash !== i - 1 && dots === 2) {
        if (res.length < 2 || !isAboveRoot || res.charCodeAt(res.length - 1) !== DOT || res.charCodeAt(res.length - 2) !== DOT) {
          if (res.length > 2) {
            const start = res.length - 1;
            let j = start;
            for (; j >= 0; --j) {
              if (res.charCodeAt(j) === SLASH) {
                break;
              }
            }
            if (j !== start) {
              res = j === -1 ? "" : res.slice(0, j);
              lastSlash = i;
              dots = 0;
              isAboveRoot = false;
              continue;
            }
          } else if (res.length === 2 || res.length === 1) {
            res = "";
            lastSlash = i;
            dots = 0;
            isAboveRoot = false;
            continue;
          }
        }
        if (allowAboveRoot) {
          if (res.length > 0) {
            res += "/..";
          } else {
            res = "..";
          }
          isAboveRoot = true;
        }
      } else {
        const slice = path.slice(lastSlash + 1, i);
        if (res.length > 0) {
          res += `/${slice}`;
        } else {
          res = slice;
        }
        isAboveRoot = false;
      }
      lastSlash = i;
      dots = 0;
    } else if (code === DOT && dots !== -1) {
      ++dots;
    } else {
      dots = -1;
    }
  }
  return res;
}

// dist/lib/node/stream.browser.js
var stream_browser_exports = {};
__export(stream_browser_exports, {
  isSupported: () => isSupported
});
var isSupported = false;

// dist/lib/files/blob-file.js
var BlobFile = class {
  handle;
  size;
  bigsize;
  url;
  constructor(blob) {
    this.handle = blob instanceof ArrayBuffer ? new Blob([blob]) : blob;
    this.size = blob instanceof ArrayBuffer ? blob.byteLength : blob.size;
    this.bigsize = BigInt(this.size);
    this.url = blob instanceof File ? blob.name : "";
  }
  async close() {
  }
  async stat() {
    return {
      size: this.handle.size,
      bigsize: BigInt(this.handle.size),
      isDirectory: false
    };
  }
  async read(start, length) {
    const arrayBuffer = await this.handle.slice(Number(start), Number(start) + Number(length)).arrayBuffer();
    return arrayBuffer;
  }
};

// dist/lib/files/http-file.js
var HttpFile = class {
  handle;
  size = 0;
  bigsize = 0n;
  url;
  constructor(url) {
    this.handle = url;
    this.url = url;
  }
  async close() {
  }
  async stat() {
    const response = await fetch(this.handle, { method: "HEAD" });
    if (!response.ok) {
      throw new Error(`Failed to fetch HEAD ${this.handle}`);
    }
    const size = parseInt(response.headers.get("Content-Length") || "0");
    return {
      size,
      bigsize: BigInt(size),
      isDirectory: false
    };
  }
  async read(offset = 0, length = 0) {
    const response = await this.fetchRange(offset, length);
    const arrayBuffer = await response.arrayBuffer();
    return arrayBuffer;
  }
  /**
   *
   * @param offset
   * @param length
   * @param signal
   * @returns
   * @see https://github.com/protomaps/PMTiles
   */
  // eslint-disable-next-line complexity
  async fetchRange(offset, length, signal) {
    const nOffset = Number(offset);
    const nLength = Number(length);
    let controller;
    if (!signal) {
      controller = new AbortController();
      signal = controller.signal;
    }
    const url = this.handle;
    let response = await fetch(url, {
      signal,
      headers: { Range: `bytes=${nOffset}-${nOffset + nLength - 1}` }
    });
    switch (response.status) {
      case 206:
        break;
      case 200:
        const contentLength = response.headers.get("Content-Length");
        if (!contentLength || Number(contentLength) > length) {
          if (controller) {
            controller.abort();
          }
          throw Error("content-length header missing or exceeding request. Server must support HTTP Byte Serving.");
        }
      case 416:
        if (offset === 0) {
          const contentRange = response.headers.get("Content-Range");
          if (!contentRange || !contentRange.startsWith("bytes *")) {
            throw Error("Missing content-length on 416 response");
          }
          const actualLength = Number(contentRange.substr(8));
          response = await fetch(this.url, {
            signal,
            headers: { Range: `bytes=0-${actualLength - 1}` }
          });
        }
        break;
      default:
        if (response.status >= 300) {
          throw Error(`Bad response code: ${response.status}`);
        }
    }
    return response;
  }
};

// dist/lib/files/node-file-facade.js
var NOT_IMPLEMENTED = new Error("Not implemented");
var NodeFileFacade = class {
  handle;
  size = 0;
  bigsize = 0n;
  url = "";
  constructor(url, flags, mode) {
    var _a;
    if ((_a = globalThis.loaders) == null ? void 0 : _a.NodeFile) {
      return new globalThis.loaders.NodeFile(url, flags, mode);
    }
    if (isBrowser) {
      throw new Error("Can't instantiate NodeFile in browser.");
    }
    throw new Error("Can't instantiate NodeFile. Make sure to import @loaders.gl/polyfills first.");
  }
  /** Read data */
  async read(start, length) {
    throw NOT_IMPLEMENTED;
  }
  /** Write to file. The number of bytes written will be returned */
  async write(arrayBuffer, offset, length) {
    throw NOT_IMPLEMENTED;
  }
  /** Get information about file */
  async stat() {
    throw NOT_IMPLEMENTED;
  }
  /** Truncates the file descriptor. Only available on NodeFile. */
  async truncate(length) {
    throw NOT_IMPLEMENTED;
  }
  /** Append data to a file. Only available on NodeFile. */
  async append(data) {
    throw NOT_IMPLEMENTED;
  }
  /** Close the file */
  async close() {
  }
};

// dist/lib/filesystems/node-filesystem-facade.js
var NOT_IMPLEMENTED2 = new Error("Not implemented");
var NodeFileSystemFacade = class {
  // implements FileSystem
  constructor(options) {
    var _a;
    if ((_a = globalThis.loaders) == null ? void 0 : _a.NodeFileSystem) {
      return new globalThis.loaders.NodeFileSystem(options);
    }
    if (isBrowser) {
      throw new Error("Can't instantiate NodeFileSystem in browser.");
    }
    throw new Error("Can't instantiate NodeFileSystem. Make sure to import @loaders.gl/polyfills first.");
  }
  // DUMMY IMPLEMENTATION, not used (constructor returns a real NodeFileSystem instance)
  // implements RandomAccessReadFileSystem
  readable = true;
  writable = true;
  async openReadableFile(path, flags) {
    throw NOT_IMPLEMENTED2;
  }
  // implements RandomAccessWriteFileSystem
  async openWritableFile(path, flags, mode) {
    throw NOT_IMPLEMENTED2;
  }
  // Implements file system
  async readdir(dirname2 = ".", options) {
    throw NOT_IMPLEMENTED2;
  }
  async stat(path, options) {
    throw NOT_IMPLEMENTED2;
  }
  async unlink(path) {
    throw NOT_IMPLEMENTED2;
  }
  async fetch(path, options) {
    throw NOT_IMPLEMENTED2;
  }
};

// dist/lib/file-provider/file-provider-interface.js
var isFileProvider = (fileProvider) => {
  return (fileProvider == null ? void 0 : fileProvider.getUint8) && (fileProvider == null ? void 0 : fileProvider.slice) && (fileProvider == null ? void 0 : fileProvider.length);
};

// dist/lib/file-provider/file-provider.js
var FileProvider = class {
  /** The File object from which data is provided */
  file;
  size;
  /** Create a new BrowserFile */
  constructor(file, size) {
    this.file = file;
    this.size = BigInt(size);
  }
  static async create(file) {
    var _a;
    let size = 0n;
    if (file.bigsize > 0n) {
      size = file.bigsize;
    } else if (file.size > 0) {
      size = file.size;
    } else {
      const stats = await ((_a = file.stat) == null ? void 0 : _a.call(file));
      size = (stats == null ? void 0 : stats.bigsize) ?? 0n;
    }
    return new FileProvider(file, size);
  }
  /**
   * Truncates the file descriptor.
   * @param length desired file lenght
   */
  async truncate(length) {
    throw new Error("file loaded via range requests cannot be changed");
  }
  /**
   * Append data to a file.
   * @param buffer data to append
   */
  async append(buffer) {
    throw new Error("file loaded via range requests cannot be changed");
  }
  /** Close file */
  async destroy() {
    throw new Error("file loaded via range requests cannot be changed");
  }
  /**
   * Gets an unsigned 8-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint8(offset) {
    const arrayBuffer = await this.file.read(offset, 1);
    const val = new Uint8Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 16-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint16(offset) {
    const arrayBuffer = await this.file.read(offset, 2);
    const val = new Uint16Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint32(offset) {
    const arrayBuffer = await this.file.read(offset, 4);
    const val = new Uint32Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getBigUint64(offset) {
    const arrayBuffer = await this.file.read(offset, 8);
    const val = new BigInt64Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * returns an ArrayBuffer whose contents are a copy of this file bytes from startOffset, inclusive, up to endOffset, exclusive.
   * @param startOffset The offset, in byte, from the start of the file where to start reading the data.
   * @param endOffset The offset, in bytes, from the start of the file where to end reading the data.
   */
  async slice(startOffset, endOffset) {
    const bigLength = BigInt(endOffset) - BigInt(startOffset);
    if (bigLength > Number.MAX_SAFE_INTEGER) {
      throw new Error("too big slice");
    }
    const length = Number(bigLength);
    return await this.file.read(startOffset, length);
  }
  /**
   * the length (in bytes) of the data.
   */
  get length() {
    return this.size;
  }
};

// dist/lib/file-provider/file-handle-file.js
var FileHandleFile = class {
  /** The FileHandle from which data is provided */
  file;
  /** Create a new FileHandleFile */
  constructor(path, append = false) {
    this.file = new NodeFileFacade(path, append ? "a+" : "r");
  }
  /**
   * Truncates the file descriptor.
   * @param length desired file lenght
   */
  async truncate(length) {
    await this.file.truncate(length);
  }
  /**
   * Append data to a file.
   * @param buffer data to append
   */
  async append(buffer) {
    await this.file.append(buffer);
  }
  /** Close file */
  async destroy() {
    await this.file.close();
  }
  /**
   * Gets an unsigned 8-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint8(offset) {
    const arrayBuffer = await this.file.read(offset, 1);
    const val = new Uint8Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 16-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint16(offset) {
    const arrayBuffer = await this.file.read(offset, 2);
    const val = new Uint16Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint32(offset) {
    const arrayBuffer = await this.file.read(offset, 4);
    const val = new Uint32Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getBigUint64(offset) {
    const arrayBuffer = await this.file.read(offset, 8);
    const val = new BigInt64Array(arrayBuffer).at(0);
    if (val === void 0) {
      throw new Error("something went wrong");
    }
    return val;
  }
  /**
   * returns an ArrayBuffer whose contents are a copy of this file bytes from startOffset, inclusive, up to endOffset, exclusive.
   * @param startOffset The offset, in byte, from the start of the file where to start reading the data.
   * @param endOffset The offset, in bytes, from the start of the file where to end reading the data.
   */
  async slice(startOffset, endOffset) {
    const bigLength = endOffset - startOffset;
    if (bigLength > Number.MAX_SAFE_INTEGER) {
      throw new Error("too big slice");
    }
    const length = Number(bigLength);
    return await this.file.read(startOffset, length);
  }
  /**
   * the length (in bytes) of the data.
   */
  get length() {
    return this.file.bigsize;
  }
};

// dist/lib/file-provider/data-view-file.js
var toNumber = (bigint) => {
  if (bigint > Number.MAX_SAFE_INTEGER) {
    throw new Error("Offset is out of bounds");
  }
  return Number(bigint);
};
var DataViewFile = class {
  /** The DataView from which data is provided */
  file;
  constructor(file) {
    this.file = file;
  }
  async destroy() {
  }
  /**
   * Gets an unsigned 8-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint8(offset) {
    return this.file.getUint8(toNumber(offset));
  }
  /**
   * Gets an unsigned 16-bit intege at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint16(offset) {
    return this.file.getUint16(toNumber(offset), true);
  }
  /**
   * Gets an unsigned 32-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getUint32(offset) {
    return this.file.getUint32(toNumber(offset), true);
  }
  /**
   * Gets an unsigned 64-bit integer at the specified byte offset from the start of the file.
   * @param offset The offset, in bytes, from the start of the file where to read the data.
   */
  async getBigUint64(offset) {
    return this.file.getBigUint64(toNumber(offset), true);
  }
  /**
   * returns an ArrayBuffer whose contents are a copy of this file bytes from startOffset, inclusive, up to endOffset, exclusive.
   * @param startOffset The offset, in bytes, from the start of the file where to start reading the data.
   * @param endOffset The offset, in bytes, from the start of the file where to end reading the data.
   */
  async slice(startOffset, endOffset) {
    return this.file.buffer.slice(toNumber(startOffset), toNumber(endOffset));
  }
  /** the length (in bytes) of the data. */
  get length() {
    return BigInt(this.file.byteLength);
  }
};

// dist/lib/sources/data-source.js
var DataSource = class {
  /** A resolved fetch function extracted from loadOptions prop */
  fetch;
  /** The actual load options, if calling a loaders.gl loader */
  loadOptions;
  _needsRefresh = true;
  props;
  constructor(props) {
    this.props = { ...props };
    this.loadOptions = { ...props.loadOptions };
    this.fetch = getFetchFunction(this.loadOptions);
  }
  setProps(props) {
    this.props = Object.assign(this.props, props);
    this.setNeedsRefresh();
  }
  /** Mark this data source as needing a refresh (redraw) */
  setNeedsRefresh() {
    this._needsRefresh = true;
  }
  /**
   * Does this data source need refreshing?
   * @note The specifics of the refresh mechanism depends on type of data source
   */
  getNeedsRefresh(clear = true) {
    const needsRefresh = this._needsRefresh;
    if (clear) {
      this._needsRefresh = false;
    }
    return needsRefresh;
  }
};
function getFetchFunction(options) {
  const fetchFunction = options == null ? void 0 : options.fetch;
  if (fetchFunction && typeof fetchFunction === "function") {
    return (url, fetchOptions2) => fetchFunction(url, fetchOptions2);
  }
  const fetchOptions = options == null ? void 0 : options.fetch;
  if (fetchOptions && typeof fetchOptions !== "function") {
    return (url) => fetch(url, fetchOptions);
  }
  return (url) => fetch(url);
}

// dist/lib/sources/image-source.js
var ImageSource = class extends DataSource {
};
__publicField(ImageSource, "type", "template");
__publicField(ImageSource, "testURL", (url) => false);

// dist/lib/sources/vector-source.js
var VectorSource = class extends DataSource {
};
__publicField(VectorSource, "type", "template");
__publicField(VectorSource, "testURL", (url) => false);
//# sourceMappingURL=index.cjs.map