Node.js APIs used to throw errors with the ERR_INVALID_CALLBACK code when they received an invalid callback. That code was removed in favor of ERR_INVALID_ARG_TYPE, which those APIs now throw instead. This codemod rewrites string references to the removed code in error-code contexts — equality comparisons, object properties such as assert.throws() expectations, switch cases, and string-matching calls like .includes() — while leaving unrelated strings, such as log messages, untouched. It also collapses checks that already tested for both codes into a single condition. See DEP0159.

Run this codemod with:

npx codemod @nodejs/err-invalid-callback

Equality checks against the old code are rewritten; both single- and double-quoted strings are supported.

 try {
   fs.readFile("file.txt", "invalid-callback");
 } catch (err) {
-  if (err.code === "ERR_INVALID_CALLBACK") {
+  if (err.code === "ERR_INVALID_ARG_TYPE") {
     console.error("Invalid callback provided");
   }
 }

Object properties, such as assert.throws() expectations, are updated.

 assert.throws(
   () => fs.readFile("file.txt", 123),
-  { code: "ERR_INVALID_CALLBACK" }
+  { code: "ERR_INVALID_ARG_TYPE" }
 );

case labels matching the old code are rewritten; other cases are left alone.

 switch (error.code) {
-  case "ERR_INVALID_CALLBACK":
+  case "ERR_INVALID_ARG_TYPE":
     console.log("Invalid callback");
     break;
 }

Arguments to string-matching methods such as .includes() are updated.

-if (err.toString().includes("ERR_INVALID_CALLBACK")) {
+if (err.toString().includes("ERR_INVALID_ARG_TYPE")) {
   // Handle callback error
 }

Code that already checked for both codes is collapsed into a single condition after the replacement.

 const isCallbackError =
-  err.code === "ERR_INVALID_CALLBACK" ||
   err.code === "ERR_INVALID_ARG_TYPE";

• Replacement is context-aware: only string literals in recognized error-code positions are rewritten. Strings in unrelated contexts, such as console.warn("ERR_INVALID_CALLBACK") or thrown message text, are intentionally left unchanged.
• The recognized string-matching methods are includes, indexOf, match, test, startsWith, and endsWith.