84 lines
2.9 KiB
JavaScript
84 lines
2.9 KiB
JavaScript
// Copyright 2024 The Matrix.org Foundation C.I.C.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// @ts-check
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/**
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* This is the entrypoint on non-node ESM environments.
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* `asyncLoad` will load the WASM module using a `fetch` call.
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*/
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import * as bindings from "./pkg/matrix_sdk_crypto_wasm_bg.js";
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const defaultURL = new URL("./pkg/matrix_sdk_crypto_wasm_bg.wasm", import.meta.url);
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// Although we could simply instantiate the WASM at import time with a top-level `await`,
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// we avoid that, to make it easier for callers to delay loading the WASM (and instead
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// wait until `initAsync` is called). (Also, Safari 14 doesn't support top-level `await`.)
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//
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// However, having done so, there is no way to synchronously load the WASM if the user ends
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// up using the bindings before calling `initAsync` (unlike under Node.js), so we just throw
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// an error.
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bindings.__wbg_set_wasm(
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new Proxy(
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{},
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{
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get() {
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throw new Error(
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"@matrix-org/matrix-sdk-crypto-wasm was used before it was initialized. Call `initAsync` first.",
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);
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},
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},
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),
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);
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/**
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* Stores a promise of the `loadModuleAsync` call
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* @type {Promise<void> | null}
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*/
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let modPromise = null;
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/**
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* Loads and instantiates the WASM module asynchronously
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*
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* @param {URL | string} url - The URL to fetch the WebAssembly module from
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* @returns {Promise<void>}
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*/
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async function loadModuleAsync(url) {
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const { instance } = await WebAssembly.instantiateStreaming(fetch(url), {
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// @ts-expect-error: The bindings don't exactly match the 'ExportValue' type
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"./matrix_sdk_crypto_wasm_bg.js": bindings,
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});
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bindings.__wbg_set_wasm(instance.exports);
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// @ts-expect-error: Typescript doesn't know what the module exports are
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instance.exports.__wbindgen_start();
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}
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/**
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* Load the WebAssembly module in the background, if it has not already been loaded.
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*
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* Returns a promise which will resolve once the other methods are ready.
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*
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* @param {URL | string} [url] - The URL to fetch the WebAssembly module from. If not provided, a default URL will be used.
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* @returns {Promise<void>}
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*/
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export async function initAsync(url = defaultURL) {
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if (!modPromise) modPromise = loadModuleAsync(url);
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await modPromise;
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}
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// Re-export everything from the generated javascript wrappers
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export * from "./pkg/matrix_sdk_crypto_wasm_bg.js";
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