Updated dependencies and replaced outdated escodegen package by astri…

…ng for now

lib/io.js

@@ -9,7 +9,8 @@
 import fs from "fs";
 import path from "path";
 
-import {generate as astToCode} from "escodegen";
+import {traverse} from "estraverse";
+import {generate as astToCode} from "astring";
 import {parse as codeToAst} from "acorn";
 
 function ensureParentDirExists(filepath)
@@ -37,7 +38,7 @@ function removeLocations(ast)
 export function parseScript(contents)
 {
   let ast = codeToAst(contents, {
-    ecmaVersion: 2021,
+    ecmaVersion: "latest",
     sourceType: "module",
     allowReturnOutsideFunction: true
   });
@@ -62,15 +63,37 @@ export function saveScript(ast, filepath)
     return;
   }
 
+  // Make sure to wrap any single-statement blocks in block statements, otherwise astring will put
+  // everything in one line.
+  function wrap(node)
+  {
+    if (!node || node.type == "BlockStatement")
+      return node;
+    else
+    {
+      return {
+        type: "BlockStatement",
+        body: [node],
+      };
+    }
+  }
+
+  traverse(ast, {
+    enter(node)
+    {
+      if (node.type == "IfStatement")
+      {
+        node.consequent = wrap(node.consequent);
+        node.alternate = wrap(node.alternate);
+      }
+      else if (["WithStatement", "WhileStatement", "DoWhileStatement", "ForStatement", "ForInStatement", "ForOfStatement"].includes(node.type))
+        node.body = wrap(node.body);
+    }
+  });
+
   let code = astToCode(ast, {
-    format: {
-      indent: {
-        style: "  "
-      },
-      quotes: "double",
-      escapeless: true
-    },
-    comment: true
+    indent: "  ",
+    comments: true
   });
 
   fs.writeFileSync(filepath, code, {encoding: "utf-8"});