Extract JS runtime eval logic into packages/jsEval workspace with tests

.github/workflows/node.js.yml

@@ -32,3 +32,17 @@ jobs:
         cache: 'npm'
     - run: npm ci
     - run: npm run tsc
+
+  test-js-eval:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22.x]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+    - run: npm ci
+    - run: npm test --workspace=packages/jsEval

app/terminal/worker/jsEval.worker.ts

@@ -4,6 +4,7 @@ import { expose } from "comlink";
 import type { ReplOutput } from "../repl";
 import type { WorkerCapabilities } from "./runtime";
 import inspect from "object-inspect";
+import { replLikeEval, checkSyntax } from "@my-code/js-eval";
 
 function format(...args: unknown[]): string {
   // TODO: console.logの第1引数はフォーマット指定文字列を取ることができる
@@ -34,41 +35,6 @@ async function init(/*_interruptBuffer?: Uint8Array*/): Promise<{
   return { capabilities: { interrupt: "restart" } };
 }
 
-async function replLikeEval(code: string): Promise<unknown> {
-  // eval()の中でconst,letを使って変数を作成した場合、
-  // 次に実行するコマンドはスコープ外扱いでありアクセスできなくなってしまうので、
-  // varに置き換えている
-  if (code.trim().startsWith("const ")) {
-    code = "var " + code.trim().slice(6);
-  } else if (code.trim().startsWith("let ")) {
-    code = "var " + code.trim().slice(4);
-  }
-  // eval()の中でclassを作成した場合も同様
-  const classRegExp = /^\s*class\s+(\w+)/;
-  if (classRegExp.test(code)) {
-    code = code.replace(classRegExp, "var $1 = class $1");
-  }
-
-  if (code.trim().startsWith("{") && code.trim().endsWith("}")) {
-    // オブジェクトは ( ) で囲わなければならない
-    try {
-      return self.eval(`(${code})`);
-    } catch (e) {
-      if (e instanceof SyntaxError) {
-        // オブジェクトではなくブロックだった場合、再度普通に実行
-        return self.eval(code);
-      } else {
-        throw e;
-      }
-    }
-  } else if (/^\s*await\W/.test(code)) {
-    // promiseをawaitする場合は、promiseの部分だけをevalし、それを外からawaitする
-    return await self.eval(code.trim().slice(5));
-  } else {
-    return self.eval(code);
-  }
-}
-
 async function runCode(
   code: string,
   onOutput: (output: ReplOutput) => void
@@ -129,32 +95,6 @@ function runFile(
   return { updatedFiles: {} as Record<string, string> };
 }
 
-async function checkSyntax(
-  code: string
-): Promise<{ status: "complete" | "incomplete" | "invalid" }> {
-  try {
-    // Try to create a Function to check syntax
-    // new Function(code); // <- not working
-    self.eval(`() => {${code}}`);
-    return { status: "complete" };
-  } catch (e) {
-    // Check if it's a syntax error or if more input is expected
-    if (e instanceof SyntaxError) {
-      // Simple heuristic: check for "Unexpected end of input"
-      if (
-        e.message.includes("Unexpected token '}'") ||
-        e.message.includes("Unexpected end of input")
-      ) {
-        return { status: "incomplete" };
-      } else {
-        return { status: "invalid" };
-      }
-    } else {
-      return { status: "invalid" };
-    }
-  }
-}
-
 async function restoreState(commands: string[]): Promise<object> {
   // Re-execute all previously successful commands to restore state
   for (const command of commands) {

package.json

@@ -3,6 +3,9 @@
   "version": "0.1.0",
   "private": true,
   "type": "module",
+  "workspaces": [
+    "packages/*"
+  ],
   "scripts": {
     "dev": "npm run cf-typegen && npm run generateLanguages && npm run generateSections && npm run copyAllDTSFiles && npm run removeHinting && next dev",
     "build": "npm run cf-typegen && npm run generateLanguages && npm run generateSections && npm run copyAllDTSFiles && npm run removeHinting && next build",

packages/jsEval/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "@my-code/js-eval",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "test": "node --import tsx/esm --test tests/*"
+  },
+  "devDependencies": {
+    "tsx": "^4",
+    "typescript": "^5"
+  }
+}