Browser support + marginally smaller modules (#1)

* Shave ~20 bytes from math.js file

This is just a small micro-optimization using converge and inline.always
to remove a few bytes off of the final .wasm size. Sadly, we can't use
"shrinkLevel": 3 since that gives imprecise results.

* Fix the message for the 10^-5 test

This confused me for a couple minutes when testing out "shrinkLevel": 3.

* Use `fetch` and `WebAssembly.instantiateStreaming`` to support browsers

Browsers don't have Node.js's Buffer, nor do they have any reasonable
way to decode base64. Luckily, `WebAssembly.instantiateStreaming` allows
using the results of `fetch`, which in turn can accept base64 data URIs.

Author: CountBleck

asconfig.json

@@ -6,6 +6,7 @@
     "debug": false,
     "noExportMemory": true,
     "optimize": true,
+    "converge": true,
     "noAssert": true
   }
 }

assembly/index.ts

@@ -1,3 +1,3 @@
 export function f64_pow(x: f64, y: f64): f64 {
-  return Math.pow(x, y);
+  return inline.always(Math.pow(x, y));
 }

index.js

@@ -1,7 +1,3 @@
 import { MathWasmBase64 } from "./build/math.js";
 
-const exports = (await WebAssembly.instantiate(Buffer.from(MathWasmBase64, "base64"))).instance.exports;
-
-export function f64_pow(value, exponent) {
-  return exports.f64_pow(value, exponent);
-}
+export const {f64_pow} = (await WebAssembly.instantiateStreaming(fetch(MathWasmBase64))).instance.exports;

scripts/postbuild.js

@@ -2,4 +2,4 @@ import { readFileSync, writeFileSync } from "fs";
 
 const base64String = readFileSync("build/math.wasm", "base64");
 
-writeFileSync("build/math.js", `export const MathWasmBase64 = "${base64String}";`);
+writeFileSync("build/math.js", `export const MathWasmBase64 = "data:application/wasm;base64,${base64String}";`);

test/index.js

@@ -2,4 +2,4 @@ import { f64_pow } from "../index.js";
 import assert from "assert";
 
 assert(f64_pow(2, 2) === 4, "2^2 == 4");
-assert(f64_pow(10, -5) === 0.00001, "2^2 == 4");
+assert(f64_pow(10, -5) === 0.00001, "10^-5 == 0.00001");