From 3bd433c950f3e4cd14aa0619fef57756c38d72cf Mon Sep 17 00:00:00 2001
From: Sergey Krashevich <svk@svk.su>
Date: Sat, 27 Dec 2025 09:09:32 +0300
Subject: [PATCH] Improve null checks and object handling in config.html

Replaces optional chaining with explicit null checks and more robust object property access throughout the file. Refactors destructuring and object spreading to use Object.assign for better compatibility. These changes improve code reliability and compatibility with older browsers or environments lacking support for newer JavaScript features.
---
 www/config.html | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/www/config.html b/www/config.html
index e6562c5d..eaf6bcdf 100644
--- a/www/config.html
+++ b/www/config.html
@@ -204,7 +204,7 @@
 
             if (indentIndex >= line.length) return null;
 
-            let i = indentIndex;
+            const i = indentIndex;
             let key = '';
             let rawKey = '';
             let isQuoted = false;
@@ -275,7 +275,7 @@
                 keyEndIndex = i + rawKey.length;
             }
 
-            const after = line.slice(colonIndex + 1) ?? '';
+            const after = line.slice(colonIndex + 1);
             const isContainer = after.trim() === '' || after.trim().startsWith('#');
             const valueStartIndex = colonIndex + 1;
 
@@ -301,11 +301,12 @@
                         if (seen.has(ref)) return schema;
                         seen.add(ref);
                         const name = ref.slice('#/definitions/'.length);
-                        const def = schemaRoot.definitions?.[name];
+                        const def = schemaRoot.definitions && schemaRoot.definitions[name];
                         if (!def) return schema;
                         const resolved = resolveRef(def, seen);
-                        const {$ref, ...rest} = schema;
-                        return {...resolved, ...rest};
+                        const rest = Object.assign({}, schema);
+                        delete rest.$ref;
+                        return Object.assign({}, resolved, rest);
                     }
                 }
                 return schema;
@@ -466,7 +467,8 @@
             let blockScalarParentIndent = null;
 
             const isBlockScalarHeader = (text) => {
-                const t = (text ?? '').trimStart();
+                const rawText = (text == null) ? '' : text;
+                const t = rawText.trimStart ? rawText.trimStart() : rawText.replace(/^\s+/, '');
                 return t.startsWith('|') || t.startsWith('>');
             };
 
@@ -495,14 +497,16 @@
                 });
             };
 
-            if (window.jsyaml?.load) {
+            if (window.jsyaml && window.jsyaml.load) {
                 try {
                     window.jsyaml.load(model.getValue());
                 } catch (e) {
-                    const mark = e?.mark || {};
+                    const mark = (e && e.mark) || {};
                     const line = typeof mark.line === 'number' ? mark.line + 1 : 1;
                     const column = typeof mark.column === 'number' ? mark.column + 1 : 1;
-                    markLineError(line, e?.reason ? `YAML: ${e.reason}` : `YAML: ${e?.message || 'Invalid YAML'}`, column);
+                    const reason = e && e.reason;
+                    const messageText = e && e.message;
+                    markLineError(line, reason ? `YAML: ${reason}` : `YAML: ${messageText || 'Invalid YAML'}`, column);
                 }
             }
 
@@ -520,7 +524,7 @@
 
             const stack = [{
                 indent: -1,
-                schema: schemaTools?.schemaRoot || null,
+                schema: (schemaTools && schemaTools.schemaRoot) || null,
                 expected: 'object',
                 actual: null,
                 keys: new Map(),
@@ -856,8 +860,8 @@
                     const lineNoCommentTrimmedEnd = lineNoComment.trimEnd();
                     const listItem = parseListItem(lineNoCommentTrimmedEnd);
 
-                    const {word, startColumn, endColumn} = model.getWordUntilPosition(position);
-                    const range = new monaco.Range(position.lineNumber, startColumn, position.lineNumber, endColumn);
+                    const wordUntil = model.getWordUntilPosition(position);
+                    const range = new monaco.Range(position.lineNumber, wordUntil.startColumn, position.lineNumber, wordUntil.endColumn);
 
                     const cursorIndex = position.column - 1;
                     let contentStartIndex = 0;
@@ -917,7 +921,7 @@
                                 kind: monaco.languages.CompletionItemKind.Property,
                                 insertText,
                                 insertTextRules: monaco.languages.CompletionItemInsertTextRule.InsertAsSnippet,
-                                documentation: s?.description,
+                                documentation: s && s.description,
                                 range,
                             };
                         });
@@ -989,7 +993,7 @@
                     if (!propSchema) return null;
 
                     const resolved = resolveRef(propSchema);
-                    const description = resolved?.description;
+                    const description = resolved && resolved.description;
                     if (!description) return null;
 
                     return {