Improve escapeIdentifier performance on long strings by 47x

Author: Llorx

packages/pg/lib/utils.js

@@ -173,35 +173,22 @@ const escapeIdentifier = function (str) {
 }
 
 const escapeLiteral = function (str) {
-  let hasBackslash = false
-  let escaped = "'"
-
-  if (str == null) {
-    return "''"
-  }
-
   if (typeof str !== 'string') {
     return "''"
   }
-
-  for (let i = 0; i < str.length; i++) {
-    const c = str[i]
-    if (c === "'") {
-      escaped += c + c
-    } else if (c === '\\') {
-      escaped += c + c
-      hasBackslash = true
-    } else {
-      escaped += c
-    }
-  }
-
-  escaped += "'"
-
-  if (hasBackslash === true) {
-    escaped = ' E' + escaped
+  let hasBackslash = false
+  let escaped = str
+    .replace(/\\/g, () => {
+        hasBackslash = true
+        return '\\\\'
+    })
+    .replace(/'/g, "''")
+  
+  if (hasBackslash) {
+    escaped = ` E'${escaped}'`
+  } else {
+    escaped = `'${escaped}'`
   }
-
   return escaped
 }