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docs(std/wasi): fix usage example #7808

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Oct 3, 2020
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docs(std/wasi): fix usage example #7808

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24 changes: 16 additions & 8 deletions std/wasi/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -59,23 +59,31 @@ import Context from "https://deno.land/std/wasi/snapshot_preview1.ts";

const context = new Context({
args: Deno.args,
env: Deno.env,
env: Deno.env.toObject(),
});

const binary = await Deno.readFile("path/to/your/module.wasm");
const module = await WebAssembly.compile(binary);
const instance = await WebAssembly.instantiate(module, {
wasi_snapshot_preview1: context.exports,
"wasi_snapshot_preview1": context.exports,
});

context.memory = context.exports.memory;
const {
_start: start,
_initialize: initialize,
memory,
} = instance.exports;

if (module.exports._start) {
instance.exports._start();
} else if (module.exports._initialize) {
instance.exports._initialize();
context.memory = memory as WebAssembly.Memory;

if (start instanceof Function) {
start();
} else if (initialize instanceof Function) {
initialize();
} else {
throw new Error("No entry point found");
throw new Error(
"No '_start' or '_initialize' entry point found in WebAssembly module, make sure to compile with wasm32-wasi as the target.",
);
}
```

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