init

node_modules/@matrix-org/matrix-sdk-crypto-wasm/index.cjs

@@ -0,0 +1,81 @@
+// Copyright 2024 The Matrix.org Foundation C.I.C.
+//
+// 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.
+
+// @ts-check
+
+/**
+ * This is the entrypoint on non-node CommonJS environments.
+ * `asyncLoad` will load the WASM module using a `fetch` call.
+ */
+
+const bindings = require("./pkg/matrix_sdk_crypto_wasm_bg.cjs");
+
+const defaultURL = require.resolve("./pkg/matrix_sdk_crypto_wasm_bg.wasm");
+
+// We want to throw an error if the user tries to use the bindings before
+// calling `initAsync`.
+bindings.__wbg_set_wasm(
+    new Proxy(
+        {},
+        {
+            get() {
+                throw new Error(
+                    "@matrix-org/matrix-sdk-crypto-wasm was used before it was initialized. Call `initAsync` first.",
+                );
+            },
+        },
+    ),
+);
+
+/**
+ * Stores a promise of the `loadModule` call
+ * @type {Promise<void> | null}
+ */
+let modPromise = null;
+
+/**
+ * Loads and instantiates the WASM module asynchronously
+ *
+ * @param {URL | string} url - The URL to fetch the WebAssembly module from
+ * @returns {Promise<void>}
+ */
+async function loadModuleAsync(url) {
+    const { instance } = await WebAssembly.instantiateStreaming(fetch(url), {
+        // @ts-expect-error: The bindings don't exactly match the 'ExportValue' type
+        "./matrix_sdk_crypto_wasm_bg.js": bindings,
+    });
+
+    bindings.__wbg_set_wasm(instance.exports);
+    // @ts-expect-error: Typescript doesn't know what the module exports are
+    instance.exports.__wbindgen_start();
+}
+
+/**
+ * Load the WebAssembly module in the background, if it has not already been loaded.
+ *
+ * Returns a promise which will resolve once the other methods are ready.
+ *
+ * @param {URL | string} [url] - The URL to fetch the WebAssembly module from. If not provided, a default URL will be used.
+ * @returns {Promise<void>}
+ */
+async function initAsync(url = defaultURL) {
+    if (!modPromise) modPromise = loadModuleAsync(url);
+    await modPromise;
+}
+
+module.exports = {
+    // Re-export everything from the generated javascript wrappers
+    ...bindings,
+    initAsync,
+};