Improve TypeScript error messages for long type assignments

Author: shaischaudhry

modify_checker.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+
+# Read the file
+with open('src/compiler/checker.ts', 'r', encoding='utf-8') as f:
+    lines = f.readlines()
+
+# Find the line to replace (should be around line 22489)
+target_line = "            reportError(message, generalizedSourceType, targetType);\n"
+replacement = """            // Check if both types are long and format differently for better readability
+            if (message === Diagnostics.Type_0_is_not_assignable_to_type_1 &&
+                generalizedSourceType.length > 30 && targetType.length > 30) {
+                // Remove quotes from type strings and format with newlines  
+                const sourceTypeUnquoted = generalizedSourceType.replace(/^'|'$/g, "");
+                const targetTypeUnquoted = targetType.replace(/^'|'$/g, "");
+                const customMessage = { 
+                    ...message, 
+                    message: `Type: \\n${sourceTypeUnquoted}\\n\\nis not assignable to type:\\n${targetTypeUnquoted}` 
+                };
+                reportError(customMessage);
+            } else {
+                reportError(message, generalizedSourceType, targetType);
+            }
+"""
+
+# Replace the line
+for i, line in enumerate(lines):
+    if line == target_line:
+        lines[i] = replacement + "\n"
+        print(f"Replaced line {i+1}")
+        break
+else:
+    print("Target line not found")
+
+# Write the file back
+with open('src/compiler/checker.ts', 'w', encoding='utf-8') as f:
+    f.writelines(lines)
+
+print("File modified successfully")