improve warning message for large file reads in fs.readFile()

Author: mertcanaltin

lib/internal/fs/promises.js

@@ -525,8 +525,9 @@ async function readFileHandle(filehandle, options) {
     size = statFields[8 /* size */];
 
     if (size > kIoMaxLength) {
+      const limit = kIoMaxLength;
       process.emitWarning(
-        `Detected \`fs.readFile()\` to read a file larger than the recommended limit (${size} > ${limit} bytes). Please consider using \`fs.createReadStream()\` instead to minimize memory overhead and increase the performance.`,
+        `Detected \`fs.readFile()\` to read a file larger than the recommended limit (${size} > ${limit} bytes). Please consider using \`fs.createReadStream()\` instead to minimize memory overhead and increase performance.`,
         'LargeFileWarning',
         ERR_FS_FILE_TOO_LARGE
       );