Correctly downcast RuntimeError through JsValue when extracting WASI exit codes

Cargo.toml

@@ -16,7 +16,15 @@ wasm-bindgen = "0.2.73"
 wasmer = { version = "3.0.2", default-features = false, features = ["js", "std"] }
 wasmer-wasi = { version = "3.0.2", default-features = false, features = ["js"] }
 wasmer-vfs = { version = "3.0.2", default-features = false, features = ["mem-fs"] }
+wasm-bindgen-downcast = "0.1.1"
 
 [profile.release]
 lto = true
 opt-level = 'z'
+
+# TODO(Michael-F-Bryan): Remove this when Wasmer 3.1 comes out
+# See https://github.com/wasmerio/wasmer-js/issues/312 for more.
+[patch.crates-io]
+wasmer = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["js", "std"], rev = "ecde2aa" }
+wasmer-wasi = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["js"], rev = "ecde2aa" }
+wasmer-vfs = { git = "https://github.com/wasmerio/wasmer", default-features = false, features = ["mem-fs"], rev = "ecde2aa" }

package.json

@@ -4,6 +4,7 @@
   "main": "dist/Library.cjs.min.js",
   "module": "dist/Library.esm.min.js",
   "unpkg": "dist/Library.umd.min.js",
+  "types": "dist/lib.d.ts",
   "keywords": [
     "webassembly",
     "wasm",
@@ -24,7 +25,7 @@
     "access": "public"
   },
   "scripts": {
-    "build": "wasm-pack build --release --target web; wasm-opt pkg/wasmer_wasi_js_bg.wasm -O2 -o pkg/wasmer_wasi_js_bg.wasm; wasm-strip pkg/wasmer_wasi_js_bg.wasm; rollup -c --environment BUILD:production",
+    "build": "wasm-pack build --release --target web && wasm-opt pkg/wasmer_wasi_js_bg.wasm -O2 -o pkg/wasmer_wasi_js_bg.wasm && wasm-strip pkg/wasmer_wasi_js_bg.wasm && rollup -c --environment BUILD:production",
     "dev": "rollup -c -w",
     "lint": "",
     "test": "jest -c jest.config.js",
@@ -54,7 +55,10 @@
     "rollup-plugin-typescript2": "^0.31.0",
     "ts-loader": "^9.2.6",
     "tslib": "^2.3.1",
-    "typescript": "^4.5.2"
+    "typescript": "^4.5.2",
+    "wabt": "^1.0.30",
+    "wasm-opt": "^1.3.0",
+    "wasm-pack": "^0.10.3"
   },
   "browserslist": "> 0.5%, last 2 versions, Firefox ESR, not dead"
 }

pkg/wasmer_wasi_js.d.ts

@@ -1,5 +1,14 @@
 /* tslint:disable */
 /* eslint-disable */
+
+interface WasiConfig {
+    readonly args?: string[],
+    readonly env?: Record<string, string>,
+    readonly preopens?: Record<string, string>,
+    readonly fs?: any,
+}
+
+
 /**
 */
 export class JSVirtualFile {
@@ -56,6 +65,10 @@ export class JSVirtualFile {
 export class MemFS {
   free(): void;
 /**
+* @returns {Symbol}
+*/
+  static __wbgd_downcast_token(): Symbol;
+/**
 */
   constructor();
 /**
@@ -102,9 +115,9 @@ export class MemFS {
 export class WASI {
   free(): void;
 /**
-* @param {any} config
+* @param {WasiConfig} config
 */
-  constructor(config: any);
+  constructor(config: WasiConfig);
 /**
 * @param {WebAssembly.Module} module
 * @returns {object}
@@ -167,14 +180,20 @@ export class WASI {
 */
 export class WasmerRuntimeError {
   free(): void;
+/**
+* @returns {Symbol}
+*/
+  static __wbgd_downcast_token(): Symbol;
 }
 
 export type InitInput = RequestInfo | URL | Response | BufferSource | WebAssembly.Module;
 
 export interface InitOutput {
   readonly memory: WebAssembly.Memory;
   readonly __wbg_wasmerruntimeerror_free: (a: number) => void;
+  readonly wasmerruntimeerror___wbgd_downcast_token: () => number;
   readonly __wbg_memfs_free: (a: number) => void;
+  readonly memfs___wbgd_downcast_token: () => number;
   readonly memfs_new: (a: number) => void;
   readonly memfs_from_js: (a: number, b: number) => void;
   readonly memfs_readDir: (a: number, b: number, c: number, d: number) => void;