PaletteSwitcher/client/public/worker.js

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JavaScript
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importScripts("./wasm_exec.js");
if (!WebAssembly.instantiateStreaming) {
WebAssembly.instantiateStreaming = async (resp, importObject) => {
const source = await (await resp).arrayBuffer();
return await WebAssembly.instantiate(source, importObject);
};
}
// Create promise to handle Worker calls whilst
// module is still initialising
let wasmResolve;
const wasmReady = new Promise((resolve) => {
wasmResolve = resolve;
});
const go = new self.Go();
addEventListener(
"message",
async (e) => {
const { eventType, eventData, eventId } = e.data;
if (eventType === "INITIALISE") {
const instantiatedSource = await WebAssembly.instantiateStreaming(
fetch(eventData),
go.importObject
);
go.run(instantiatedSource.instance);
// Go does nor exposes the exports in the instantiated module :(((
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const methods = ["dither"];
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wasmResolve(methods);
postMessage({
eventType: "INITIALISED",
eventData: methods,
});
} else if (eventType === "CALL") {
await wasmReady;
try {
const method = self[eventData.method];
const result = await method.apply(null, eventData.arguments);
self.postMessage({
eventType: "RESULT",
eventData: result,
eventId: eventId,
});
} catch (e) {
self.postMessage({
eventType: "ERROR",
eventData:
"An error occured executing WASM instance function: " +
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e.toString(),
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eventId: eventId,
});
}
}
},
false
);