forked from swiftwasm/JavaScriptKit
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathindex.js
More file actions
54 lines (47 loc) · 1.53 KB
/
index.js
File metadata and controls
54 lines (47 loc) · 1.53 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
import { SwiftRuntime } from "javascript-kit-swift";
import { WASI } from "@wasmer/wasi";
import { WasmFs } from "@wasmer/wasmfs";
const swift = new SwiftRuntime();
// Instantiate a new WASI Instance
const wasmFs = new WasmFs();
// Output stdout and stderr to console
const originalWriteSync = wasmFs.fs.writeSync;
wasmFs.fs.writeSync = (fd, buffer, offset, length, position) => {
const text = new TextDecoder("utf-8").decode(buffer);
// Filter out standalone "\n" added by every `print`, `console.log`
// always adds its own "\n" on top.
if (text !== "\n") {
switch (fd) {
case 1:
console.log(text);
break;
case 2:
console.error(text);
break;
}
}
return originalWriteSync(fd, buffer, offset, length, position);
};
let wasi = new WASI({
args: [],
env: {},
bindings: {
...WASI.defaultBindings,
fs: wasmFs.fs,
},
});
const startWasiTask = async () => {
// Fetch our Wasm File
const response = await fetch("JavaScriptKitExample.wasm");
const responseArrayBuffer = await response.arrayBuffer();
// Instantiate the WebAssembly file
const wasm_bytes = new Uint8Array(responseArrayBuffer).buffer;
let { instance } = await WebAssembly.instantiate(wasm_bytes, {
wasi_snapshot_preview1: wasi.wasiImport,
javascript_kit: swift.importObjects(),
});
swift.setInstance(instance);
// Start the WebAssembly WASI instance!
wasi.start(instance);
};
startWasiTask();