Improve escapeLiteral performance of long strings by 30x

packages/pg/lib/utils.js

@@ -173,36 +173,47 @@
 }
 
 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
+  let hasBackslash = false
+  if (str.length < 13) {
+    // This methid is a bit faster for short strings
+    let escaped = "'"
+
+    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
+    }
+    return escaped
+  } else {
+    let escaped = str
+        .replace(/\\/g, () => {
+            hasBackslash = true
+            return '\\\\'
+        })
+        .replace(/'/g, "''")
+
+    if (hasBackslash) {
+        escaped = ` E'${escaped}'`
     } else {
-      escaped += c
+        escaped = `'${escaped}'`
     }
+    return escaped
   }
-
-  escaped += "'"
-
-  if (hasBackslash === true) {
-    escaped = ' E' + escaped
-  }
-
-  return escaped
 }
 
 module.exports = {