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Code Issues Packages 1 Wiki Activity

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

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The usage example is a bit out of date and not compatible with the
stricter definition of the WebAssembly namespace.

This fixes that and makes it a bit cleaner.
This commit is contained in:
Casper Beyer 2020-10-03 21:52:34 +08:00 committed by GitHub
parent ae1ed2d166
commit e8b93674ed
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1 changed files with 16 additions and 8 deletions
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24
std/wasi/README.md
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@ -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.",
);
}
```