update go.js

npm-packages/cadence-language-server/README.md

@@ -6,5 +6,16 @@ so it can be used in tools written in JavaScript.
 
 ## Releasing
 
-To release a new version of the Language server NPM package all you need to do is create a release of Langauge server and GitHub action will also publish a new version of WebAssembly built binary to NPM. 
+To release a new version of the Language server NPM package all you need to do is create a release of Langauge server and GitHub action will also publish a new version of WebAssembly built binary to NPM.
 That newly build NPM package using the WebAssembly will be published and can be found on NPM https://www.npmjs.com/package/@onflow/cadence-language-server
+
+## Development
+
+### Updating `src/go.js`
+
+- Copy `misc/wasm/wasm_exec.js` of appropriate Go version into `src/go.js`.
+  Keep the last line (`export const go = new Go();`)
+- Update the version in the header
+- Remove the anonymous function wrapper
+- Change `globalThis.Go = class {` to `class Go {`
+- Run `npx prettier -w src/go.js`

npm-packages/cadence-language-server/package.json

@@ -20,7 +20,8 @@
     "node-fetch": "^2.6.1",
     "ts-jest": "^29.1.1",
     "typescript": "^5.2.2",
-    "vscode-languageserver-protocol": "^3.17.5"
+    "vscode-languageserver-protocol": "^3.17.5",
+    "prettier": "^3.2.5"
   },
   "files": [
     "dist/**/*"

npm-packages/cadence-language-server/src/go.js

@@ -1,9 +1,11 @@
-// Adapted from https://github.com/golang/go/blob/go1.20.14/misc/wasm/wasm_exec.js
+// Adapted from https://github.com/golang/go/blob/go1.21.9/misc/wasm/wasm_exec.js
 
 // Copyright 2018 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+"use strict";
+
 const enosys = () => {
   const err = new Error("not implemented");
   err.code = "ENOSYS";
@@ -143,13 +145,13 @@ if (!globalThis.process) {
 
 if (!globalThis.crypto) {
   throw new Error(
-    "globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)"
+    "globalThis.crypto is not available, polyfill required (crypto.getRandomValues only)",
   );
 }
 
 if (!globalThis.performance) {
   throw new Error(
-    "globalThis.performance is not available, polyfill required (performance.now only)"
+    "globalThis.performance is not available, polyfill required (performance.now only)",
   );
 }
 
@@ -185,6 +187,10 @@ class Go {
       this.mem.setUint32(addr + 4, Math.floor(v / 4294967296), true);
     };
 
+    const setInt32 = (addr, v) => {
+      this.mem.setUint32(addr + 0, v, true);
+    };
+
     const getInt64 = (addr) => {
       const low = this.mem.getUint32(addr + 0, true);
       const high = this.mem.getInt32(addr + 4, true);
@@ -274,13 +280,16 @@ class Go {
       const saddr = getInt64(addr + 0);
       const len = getInt64(addr + 8);
       return decoder.decode(
-        new DataView(this._inst.exports.mem.buffer, saddr, len)
+        new DataView(this._inst.exports.mem.buffer, saddr, len),
       );
     };
 
     const timeOrigin = Date.now() - performance.now();
     this.importObject = {
-      go: {
+      _gotest: {
+        add: (a, b) => a + b,
+      },
+      gojs: {
         // Go's SP does not change as long as no Go code is running. Some operations (e.g. calls, getters and setters)
         // may synchronously trigger a Go event handler. This makes Go code get executed in the middle of the imported
         // function. A goroutine can switch to a new stack if the current stack is too small (see morestack function).
@@ -345,8 +354,8 @@ class Go {
                   this._resume();
                 }
               },
-              getInt64(sp + 8) + 1 // setTimeout has been seen to fire up to 1 millisecond early
-            )
+              getInt64(sp + 8),
+            ),
           );
           this.mem.setInt32(sp + 16, id, true);
         },
@@ -398,7 +407,7 @@ class Go {
           Reflect.set(
             loadValue(sp + 8),
             loadString(sp + 16),
-            loadValue(sp + 32)
+            loadValue(sp + 32),
           );
         },
 
@@ -413,7 +422,7 @@ class Go {
           sp >>>= 0;
           storeValue(
             sp + 24,
-            Reflect.get(loadValue(sp + 8), getInt64(sp + 16))
+            Reflect.get(loadValue(sp + 8), getInt64(sp + 16)),
           );
         },
 
@@ -501,7 +510,7 @@ class Go {
           sp >>>= 0;
           this.mem.setUint8(
             sp + 24,
-            loadValue(sp + 8) instanceof loadValue(sp + 16) ? 1 : 0
+            loadValue(sp + 8) instanceof loadValue(sp + 16) ? 1 : 0,
           );
         },
 
@@ -615,7 +624,7 @@ class Go {
     const wasmMinDataAddr = 4096 + 8192;
     if (offset >= wasmMinDataAddr) {
       throw new Error(
-        "total length of command line and environment variables exceeds limit"
+        "total length of command line and environment variables exceeds limit",
       );
     }
 
@@ -645,6 +654,6 @@ class Go {
       return event.result;
     };
   }
-}
+};
 
 export const go = new Go();