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2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb
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/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
import '../flags';
import { env } from '../environment';
import { BrowserIndexedDB, BrowserIndexedDBManager } from '../io/indexed_db';
import { BrowserLocalStorage, BrowserLocalStorageManager } from '../io/local_storage';
import { ModelStoreManagerRegistry } from '../io/model_management';
import { isTypedArrayBrowser } from './is_typed_array_browser';
export class PlatformBrowser {
    constructor() {
        // For setTimeoutCustom
        this.messageName = 'setTimeoutCustom';
        this.functionRefs = [];
        this.handledMessageCount = 0;
        this.hasEventListener = false;
    }
    fetch(path, init) {
        return fetch(path, init);
    }
    now() {
        return performance.now();
    }
    encode(text, encoding) {
        if (encoding !== 'utf-8' && encoding !== 'utf8') {
            throw new Error(`Browser's encoder only supports utf-8, but got ${encoding}`);
        }
        if (this.textEncoder == null) {
            this.textEncoder = new TextEncoder();
        }
        return this.textEncoder.encode(text);
    }
    decode(bytes, encoding) {
        return new TextDecoder(encoding).decode(bytes);
    }
    // If the setTimeout nesting level is greater than 5 and timeout is less
    // than 4ms, timeout will be clamped to 4ms, which hurts the perf.
    // Interleaving window.postMessage and setTimeout will trick the browser and
    // avoid the clamp.
    setTimeoutCustom(functionRef, delay) {
        if (typeof window === 'undefined' ||
            !env().getBool('USE_SETTIMEOUTCUSTOM')) {
            setTimeout(functionRef, delay);
            return;
        }
        this.functionRefs.push(functionRef);
        setTimeout(() => {
            window.postMessage({ name: this.messageName, index: this.functionRefs.length - 1 }, '*');
        }, delay);
        if (!this.hasEventListener) {
            this.hasEventListener = true;
            window.addEventListener('message', (event) => {
                if (event.source === window && event.data.name === this.messageName) {
                    event.stopPropagation();
                    const functionRef = this.functionRefs[event.data.index];
                    functionRef();
                    this.handledMessageCount++;
                    if (this.handledMessageCount === this.functionRefs.length) {
                        this.functionRefs = [];
                        this.handledMessageCount = 0;
                    }
                }
            }, true);
        }
    }
    isTypedArray(a) {
        return isTypedArrayBrowser(a);
    }
}
if (env().get('IS_BROWSER')) {
    env().setPlatform('browser', new PlatformBrowser());
    // Register LocalStorage IOHandler
    try {
        ModelStoreManagerRegistry.registerManager(BrowserLocalStorage.URL_SCHEME, new BrowserLocalStorageManager());
    }
    catch (err) {
    }
    // Register IndexedDB IOHandler
    try {
        ModelStoreManagerRegistry.registerManager(BrowserIndexedDB.URL_SCHEME, new BrowserIndexedDBManager());
    }
    catch (err) {
    }
}
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All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\n\nimport '../flags';\n\nimport {env} from '../environment';\nimport {BrowserIndexedDB, BrowserIndexedDBManager} from '../io/indexed_db';\nimport {BrowserLocalStorage, BrowserLocalStorageManager} from '../io/local_storage';\nimport {ModelStoreManagerRegistry} from '../io/model_management';\n\nimport {Platform} from './platform';\nimport {isTypedArrayBrowser} from './is_typed_array_browser';\n\nexport class PlatformBrowser implements Platform {\n  // According to the spec, the built-in encoder can do only UTF-8 encoding.\n  // https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder/TextEncoder\n  private textEncoder: TextEncoder;\n\n  // For setTimeoutCustom\n  private readonly messageName = 'setTimeoutCustom';\n  private functionRefs: Function[] = [];\n  private handledMessageCount = 0;\n  private hasEventListener = false;\n\n  fetch(path: string, init?: RequestInit): Promise<Response> {\n    return fetch(path, init);\n  }\n\n  now(): number {\n    return performance.now();\n  }\n\n  encode(text: string, encoding: string): Uint8Array {\n    if (encoding !== 'utf-8' && encoding !== 'utf8') {\n      throw new Error(\n          `Browser's encoder only supports utf-8, but got ${encoding}`);\n    }\n    if (this.textEncoder == null) {\n      this.textEncoder = new TextEncoder();\n    }\n    return this.textEncoder.encode(text);\n  }\n  decode(bytes: Uint8Array, encoding: string): string {\n    return new TextDecoder(encoding).decode(bytes);\n  }\n\n  // If the setTimeout nesting level is greater than 5 and timeout is less\n  // than 4ms, timeout will be clamped to 4ms, which hurts the perf.\n  // Interleaving window.postMessage and setTimeout will trick the browser and\n  // avoid the clamp.\n  setTimeoutCustom(functionRef: Function, delay: number): void {\n    if (typeof window === 'undefined' ||\n        !env().getBool('USE_SETTIMEOUTCUSTOM')) {\n      setTimeout(functionRef, delay);\n      return;\n    }\n\n    this.functionRefs.push(functionRef);\n    setTimeout(() => {\n      window.postMessage(\n          {name: this.messageName, index: this.functionRefs.length - 1}, '*');\n    }, delay);\n\n    if (!this.hasEventListener) {\n      this.hasEventListener = true;\n      window.addEventListener('message', (event: MessageEvent) => {\n        if (event.source === window && event.data.name === this.messageName) {\n          event.stopPropagation();\n          const functionRef = this.functionRefs[event.data.index];\n          functionRef();\n          this.handledMessageCount++;\n          if (this.handledMessageCount === this.functionRefs.length) {\n            this.functionRefs = [];\n            this.handledMessageCount = 0;\n          }\n        }\n      }, true);\n    }\n  }\n\n  isTypedArray(a: unknown): a is Uint8Array | Float32Array | Int32Array\n    | Uint8ClampedArray {\n    return isTypedArrayBrowser(a);\n  }\n}\n\nif (env().get('IS_BROWSER')) {\n  env().setPlatform('browser', new PlatformBrowser());\n\n  // Register LocalStorage IOHandler\n  try {\n    ModelStoreManagerRegistry.registerManager(\n        BrowserLocalStorage.URL_SCHEME, new BrowserLocalStorageManager());\n  } catch (err) {\n  }\n\n  // Register IndexedDB IOHandler\n  try {\n    ModelStoreManagerRegistry.registerManager(\n        BrowserIndexedDB.URL_SCHEME, new BrowserIndexedDBManager());\n  } catch (err) {\n  }\n}\n"]}