59 lines
2.0 KiB
HTML
59 lines
2.0 KiB
HTML
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<html>
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<head>
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<meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
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</head>
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<body>
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<!-- Note the usage of `type=module` here as this is an ES6 module -->
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<script type="module">
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// Use ES module import syntax to import functionality from the module
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// that we have compiled.
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//
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// Note that the `default` import is an initialization function which
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// will "boot" the module and make it ready to use. Currently browsers
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// don't support natively imported WebAssembly as an ES module, but
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// eventually the manual initialization won't be required!
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import init, { add } from './pkg/mapgen_demo.js';
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async function run() {
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// First up we need to actually load the wasm file, so we use the
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// default export to inform it where the wasm file is located on the
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// server, and then we wait on the returned promise to wait for the
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// wasm to be loaded.
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//
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// It may look like this: `await init('./pkg/without_a_bundler_bg.wasm');`,
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// but there is also a handy default inside `init` function, which uses
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// `import.meta` to locate the wasm file relatively to js file.
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//
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// Note that instead of a string you can also pass in any of the
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// following things:
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//
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// * `WebAssembly.Module`
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//
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// * `ArrayBuffer`
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//
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// * `Response`
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//
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// * `Promise` which returns any of the above, e.g. `fetch("./path/to/wasm")`
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//
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// This gives you complete control over how the module is loaded
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// and compiled.
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//
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// Also note that the promise, when resolved, yields the wasm module's
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// exports which is the same as importing the `*_bg` module in other
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// modes
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await init();
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// And afterwards we can use all the functionality defined in wasm.
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const result = add(1, 2);
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console.log(`1 + 2 = ${result}`);
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if (result !== 3)
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throw new Error("wasm addition doesn't work!");
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}
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run();
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</script>
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</body>
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</html>
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