diff --git a/lib/internal/errors.js b/lib/internal/errors.js
index 831532c6d4f37a..bb981290168c8c 100644
--- a/lib/internal/errors.js
+++ b/lib/internal/errors.js
@@ -392,8 +392,9 @@ function makeNodeErrorWithCode(Base, key) {
 
 /**
  * This function removes unnecessary frames from Node.js core errors.
- * @template {(...args: any[]) => any} T
- * @type {(fn: T) => T}
+ * @template {(...args: unknown[]) => unknown} T
+ * @param {T} fn
+ * @returns {T}
  */
 function hideStackFrames(fn) {
   // We rename the functions that will be hidden to cut off the stacktrace
diff --git a/lib/internal/validators.js b/lib/internal/validators.js
index 09c836e7258276..9b25868cf4abed 100644
--- a/lib/internal/validators.js
+++ b/lib/internal/validators.js
@@ -34,10 +34,18 @@ const {
 } = require('internal/util/types');
 const { signals } = internalBinding('constants').os;
 
+/**
+ * @param {*} value
+ * @returns {boolean}
+ */
 function isInt32(value) {
   return value === (value | 0);
 }
 
+/**
+ * @param {*} value
+ * @returns {boolean}
+ */
 function isUint32(value) {
   return value === (value >>> 0);
 }
@@ -70,6 +78,16 @@ function parseFileMode(value, name, def) {
   return value;
 }
 
+/**
+ * @callback validateInteger
+ * @param {*} value
+ * @param {string} name
+ * @param {number} [min]
+ * @param {number} [max]
+ * @returns {asserts value is number}
+ */
+
+/** @type {validateInteger} */
 const validateInteger = hideStackFrames(
   (value, name, min = NumberMIN_SAFE_INTEGER, max = NumberMAX_SAFE_INTEGER) => {
     if (typeof value !== 'number')
@@ -81,6 +99,16 @@ const validateInteger = hideStackFrames(
   }
 );
 
+/**
+ * @callback validateInt32
+ * @param {*} value
+ * @param {string} name
+ * @param {number} [min]
+ * @param {number} [max]
+ * @returns {asserts value is number}
+ */
+
+/** @type {validateInt32} */
 const validateInt32 = hideStackFrames(
   (value, name, min = -2147483648, max = 2147483647) => {
     // The defaults for min and max correspond to the limits of 32-bit integers.
@@ -96,7 +124,16 @@ const validateInt32 = hideStackFrames(
   }
 );
 
-const validateUint32 = hideStackFrames((value, name, positive) => {
+/**
+ * @callback validateUint32
+ * @param {*} value
+ * @param {string} name
+ * @param {number|boolean} [positive=false]
+ * @returns {asserts value is number}
+ */
+
+/** @type {validateUint32} */
+const validateUint32 = hideStackFrames((value, name, positive = false) => {
   if (typeof value !== 'number') {
     throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
   }
@@ -111,11 +148,29 @@ const validateUint32 = hideStackFrames((value, name, positive) => {
   }
 });
 
+/**
+ * @callback validateString
+ * @param {*} value
+ * @param {string} name
+ * @returns {asserts value is string}
+ */
+
+/** @type {validateString} */
 function validateString(value, name) {
   if (typeof value !== 'string')
     throw new ERR_INVALID_ARG_TYPE(name, 'string', value);
 }
 
+/**
+ * @callback validateNumber
+ * @param {*} value
+ * @param {string} name
+ * @param {number} [min]
+ * @param {number} [max]
+ * @returns {asserts value is number}
+ */
+
+/** @type {validateNumber} */
 function validateNumber(value, name, min = undefined, max) {
   if (typeof value !== 'number')
     throw new ERR_INVALID_ARG_TYPE(name, 'number', value);
@@ -129,6 +184,15 @@ function validateNumber(value, name, min = undefined, max) {
   }
 }
 
+/**
+ * @callback validateOneOf
+ * @template T
+ * @param {T} value
+ * @param {string} name
+ * @param {T[]} oneOf
+ */
+
+/** @type {validateOneOf} */
 const validateOneOf = hideStackFrames((value, name, oneOf) => {
   if (!ArrayPrototypeIncludes(oneOf, value)) {
     const allowed = ArrayPrototypeJoin(
@@ -140,6 +204,14 @@ const validateOneOf = hideStackFrames((value, name, oneOf) => {
   }
 });
 
+/**
+ * @callback validateBoolean
+ * @param {*} value
+ * @param {string} name
+ * @returns {asserts value is boolean}
+ */
+
+/** @type {validateBoolean} */
 function validateBoolean(value, name) {
   if (typeof value !== 'boolean')
     throw new ERR_INVALID_ARG_TYPE(name, 'boolean', value);
@@ -152,7 +224,8 @@ function getOwnPropertyValueOrDefault(options, key, defaultValue) {
 }
 
 /**
- * @param {unknown} value
+ * @callback validateObject
+ * @param {*} value
  * @param {string} name
  * @param {{
  *   allowArray?: boolean,
@@ -160,8 +233,10 @@ function getOwnPropertyValueOrDefault(options, key, defaultValue) {
  *   nullable?: boolean
  * }} [options]
  */
+
+/** @type {validateObject} */
 const validateObject = hideStackFrames(
-  (value, name, options) => {
+  (value, name, options = null) => {
     const allowArray = getOwnPropertyValueOrDefault(options, 'allowArray', false);
     const allowFunction = getOwnPropertyValueOrDefault(options, 'allowFunction', false);
     const nullable = getOwnPropertyValueOrDefault(options, 'nullable', false);
@@ -174,6 +249,15 @@ const validateObject = hideStackFrames(
     }
   });
 
+/**
+ * @callback validateArray
+ * @param {*} value
+ * @param {string} name
+ * @param {number} [minLength]
+ * @returns {asserts value is any[]}
+ */
+
+/** @type {validateArray} */
 const validateArray = hideStackFrames((value, name, minLength = 0) => {
   if (!ArrayIsArray(value)) {
     throw new ERR_INVALID_ARG_TYPE(name, 'Array', value);
@@ -184,6 +268,12 @@ const validateArray = hideStackFrames((value, name, minLength = 0) => {
   }
 });
 
+// eslint-disable-next-line jsdoc/require-returns-check
+/**
+ * @param {*} signal
+ * @param {string} [name='signal']
+ * @returns {asserts signal is keyof signals}
+ */
 function validateSignalName(signal, name = 'signal') {
   validateString(signal, name);
 
@@ -197,6 +287,14 @@ function validateSignalName(signal, name = 'signal') {
   }
 }
 
+/**
+ * @callback validateBuffer
+ * @param {*} buffer
+ * @param {string} [name='buffer']
+ * @returns {asserts buffer is ArrayBufferView}
+ */
+
+/** @type {validateBuffer} */
 const validateBuffer = hideStackFrames((buffer, name = 'buffer') => {
   if (!isArrayBufferView(buffer)) {
     throw new ERR_INVALID_ARG_TYPE(name,
@@ -205,6 +303,10 @@ const validateBuffer = hideStackFrames((buffer, name = 'buffer') => {
   }
 });
 
+/**
+ * @param {string} data
+ * @param {string} encoding
+ */
 function validateEncoding(data, encoding) {
   const normalizedEncoding = normalizeEncoding(encoding);
   const length = data.length;
@@ -215,8 +317,14 @@ function validateEncoding(data, encoding) {
   }
 }
 
-// Check that the port number is not NaN when coerced to a number,
-// is an integer and that it falls within the legal range of port numbers.
+/**
+ * Check that the port number is not NaN when coerced to a number,
+ * is an integer and that it falls within the legal range of port numbers.
+ * @param {*} port
+ * @param {string} [name='Port']
+ * @param {boolean} [allowZero=true]
+ * @returns {number}
+ */
 function validatePort(port, name = 'Port', allowZero = true) {
   if ((typeof port !== 'number' && typeof port !== 'string') ||
       (typeof port === 'string' && StringPrototypeTrim(port).length === 0) ||
@@ -228,6 +336,13 @@ function validatePort(port, name = 'Port', allowZero = true) {
   return port | 0;
 }
 
+/**
+ * @callback validateAbortSignal
+ * @param {*} signal
+ * @param {string} name
+ */
+
+/** @type {validateAbortSignal} */
 const validateAbortSignal = hideStackFrames((signal, name) => {
   if (signal !== undefined &&
       (signal === null ||
@@ -237,21 +352,51 @@ const validateAbortSignal = hideStackFrames((signal, name) => {
   }
 });
 
+/**
+ * @callback validateFunction
+ * @param {*} value
+ * @param {string} name
+ * @returns {asserts value is Function}
+ */
+
+/** @type {validateFunction} */
 const validateFunction = hideStackFrames((value, name) => {
   if (typeof value !== 'function')
     throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
 });
 
+/**
+ * @callback validatePlainFunction
+ * @param {*} value
+ * @param {string} name
+ * @returns {asserts value is Function}
+ */
+
+/** @type {validatePlainFunction} */
 const validatePlainFunction = hideStackFrames((value, name) => {
   if (typeof value !== 'function' || isAsyncFunction(value))
     throw new ERR_INVALID_ARG_TYPE(name, 'Function', value);
 });
 
+/**
+ * @callback validateUndefined
+ * @param {*} value
+ * @param {string} name
+ * @returns {asserts value is undefined}
+ */
+
+/** @type {validateUndefined} */
 const validateUndefined = hideStackFrames((value, name) => {
   if (value !== undefined)
     throw new ERR_INVALID_ARG_TYPE(name, 'undefined', value);
 });
 
+/**
+ * @template T
+ * @param {T} value
+ * @param {string} name
+ * @param {T[]} union
+ */
 function validateUnion(value, name, union) {
   if (!ArrayPrototypeIncludes(union, value)) {
     throw new ERR_INVALID_ARG_TYPE(name, `('${ArrayPrototypeJoin(union, '|')}')`, value);