feat: use webassembly-loader internally (#8)

* feat: use webassembly-loader internally

* test: utilize jest-each for better error reporting

* docs: update README due to loader integration

* ci: lock Rust version to 1.28.0

Author: DrSensor

.circleci/config.yml

@@ -6,9 +6,9 @@ rustup_nightly: &rustup_nightly
     name: Install Cargo and Rust compiler
     command: |
       echo 'export PATH="$HOME/.cargo/bin:$PATH"' >> $BASH_ENV
-      curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain nightly
+      curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain 1.28.0
       source $BASH_ENV
-      rustup target add wasm32-unknown-unknown --toolchain nightly
+      rustup target add wasm32-unknown-unknown
 smoke_tests: &smoke_tests
   steps:
     - checkout

README.md

@@ -8,7 +8,6 @@
 </div>
 
 [![npm][npm]][npm-url]
-[![node][node]][node-url]
 [![size][size]][size-url]
 [![npm][npm-download]][npm-url]
 [![deps][deps]][deps-url]
@@ -27,7 +26,19 @@ This is a jest transformer that loads Rust code so it can be interop with Javasc
 
 ## Requirements
 
-This module requires a minimum of Node v8.9.0, Jest v23.4.2, and Rust in [nightly channel][].
+<ul>
+<li>Node v8 or later</li>
+<li>Jest v23 or later</li>
+<li><details>
+<summary>Rust v1.28.0 with wasm32-uknown-unknown installed</summary>
+
+```console
+rustup default 1.28.0
+rustup target add wasm32-unknown-unknown
+```
+
+</details></li>
+</ul>
 
 ## Getting Started
 
@@ -94,17 +105,7 @@ Pretty much like [ts-jest][], you can configure `rs-jest` by using global variab
 <details>
 <summary><b><code>export</code></b></summary>
 
-- Type: `string`
-- Default: `promise`
-- Expected value:
-  - `buffer` will export wasm code as [Buffer][]
-  - `module` will export wasm code as [WebAssembly.Module][]
-  - `instance` will export wasm code as [WebAssembly.Instance][]
-  - `async` will [instantiate][webassembly.instantiate] wasm code asynchronously, return promise of both [WebAssembly.Module][] and [WebAssembly.Instance][]
-  - `async-module` will [compile][webassembly.compile] wasm code asynchronously, return promise of [WebAssembly.Module][]
-  - `async-instance` will [instantiate][webassembly.instantiate] wasm code asynchronously, return promise of [WebAssembly.Instance][]
-
-How wasm code would be exported. (see [examples](#examples))
+How wasm code would be exported. This options is identical with [option `export` in webassembly-loader][webassembly-loader]. (see [examples](#examples))
 
 ```json
 {
@@ -316,17 +317,10 @@ wasmCompile(importObject | undefined).then(module => {
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FDrSensor%2Frs-jest.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FDrSensor%2Frs-jest?ref=badge_large)
 
 [ts-jest]: https://github.com/kulshekhar/ts-jest/
-[nightly channel]: https://rustwasm.github.io/book/game-of-life/setup.html#the-wasm32-unknown-unknown-target
-[buffer]: https://nodejs.org/api/buffer.html
-[webassembly.module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module
-[webassembly.instance]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance
-[webassembly.instantiate]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/instantiate
-[webassembly.compile]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/compile
+[webassembly-loader]: https://github.com/DrSensor/webassembly-loader#export
 [npm]: https://img.shields.io/npm/v/rs-jest.svg
 [npm-url]: https://npmjs.com/package/rs-jest
 [npm-download]: https://img.shields.io/npm/dm/rs-jest.svg
-[node]: https://img.shields.io/node/v/rs-jest.svg
-[node-url]: https://nodejs.org
 [deps]: https://david-dm.org/DrSensor/rs-jest.svg
 [deps-url]: https://david-dm.org/DrSensor/rs-jest
 [tests]: https://img.shields.io/circleci/project/github/DrSensor/rs-jest.svg

package-lock.json

@@ -90,6 +90,8 @@
 		"ts-node": "^7.0.1",
 		"tslint": "^5.11.0",
 		"tslint-config-prettier": "^1.15.0",
-		"typescript": "^3.0.1"
-	}
+		"typescript": "^3.0.1",
+		"webassembly-loader": "^1.1.0"
+	},
+	"dependencies": {}
 }

package.json

@@ -36,9 +36,9 @@ export default [
 				exclude: ["test/**"],
 				tsconfigOverride: {compilerOptions: {module: "esnext"}}
 			}),
+			babel(),
 			commonjs(),
 			resolve(),
-			babel(),
 			autoExternal(),
 			prettier(prettierrc.files("*.js"))
 		]

rollup.config.js

@@ -3,7 +3,7 @@ import { cargoCommand, findSrcDir, handleCargo } from './cargo';
 
 import { flushLogs, logOnce, execPermissive } from './utils';
 import { defaultConfig, getConfigFrom } from './options';
-import wrap from './wrapper';
+import wasm2js from 'webassembly-loader';
 
 //#region helper
 const is = (path: string) => ({ rustFile: /\.rs$/.test(path) });
@@ -70,18 +70,8 @@ export default function preprocess(
   const wasmCode = readFileSync(wasmFile);
   flushLogs();
 
-  switch (options.export) {
-    case 'buffer':
-      return wrap(wasmCode).asBuffer;
-    case 'instance':
-      return wrap(wasmCode).asWebAssembly.Instance;
-    case 'module':
-      return wrap(wasmCode).asWebAssembly.Module;
-    case 'async':
-      return wrap(wasmCode).promiseWebAssembly.Both;
-    case 'async-instance':
-      return wrap(wasmCode).promiseWebAssembly.Instance;
-    case 'async-module':
-      return wrap(wasmCode).promiseWebAssembly.Module;
-  }
+  return wasm2js(wasmCode, {
+    export: options.export,
+    module: 'cjs'
+  });
 }

src/preprocess.ts

@@ -1,15 +1,18 @@
 /// https://stackoverflow.com/a/50856790/5221998
 import { resolve } from './utils';
+import { basename } from 'path';
 import jest_please = require('jest');
 
 describe('test export mode', () => {
   const options = {
     reporters: [['jest-silent-reporter', { useDots: true }]]
   } as jestCLI.Options;
 
-  test('globals: {"rs-jest": {export: *}}', async () => {
-    options.projects = resolve('fixtures/export_*');
-    const { results } = await jest_please.runCLI(options, options.projects);
+  const fixture = resolve('fixtures/export_*');
+  const projects = fixture.map((s, i) => [basename(s).replace('_', ' as '), i]);
+
+  test.each(projects)(`%s`, async (s, i) => {
+    const { results } = await jest_please.runCLI(options, [fixture[i]]);
     expect(results.success).toBe(true);
   });
 });