diff --git a/.eslintrc.js b/.eslintrc.js
index 1167273a..de4697c8 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -38,4 +38,11 @@ module.exports = {
         'jsdoc/require-param-description': 0,
         'jsdoc/require-returns-description': 0,
     },
+    settings: {
+        jsdoc: {
+            preferredTypes: {
+                object: 'Object',
+            },
+        },
+    },
 };
diff --git a/scripts/build-compatibility-table.js b/scripts/build-compatibility-table.js
index 4fb62ba6..9fb98825 100644
--- a/scripts/build-compatibility-table.js
+++ b/scripts/build-compatibility-table.js
@@ -20,14 +20,14 @@ const WIKI_COMPATIBILITY_TABLE_PATH = path.resolve(
 );
 
 /**
- * @typedef {object} CompatibilityItem
+ * @typedef {Object} CompatibilityItem
  * @property {string} adg AdGuard name
  * @property {string} abp Adblock Plus name
  * @property {string} ubo uBlock name
  */
 
 /**
- * @typedef {object} CompatibilityData
+ * @typedef {Object} CompatibilityData
  * @property {CompatibilityItem[]} scriptlets list of scriptlets compatibility items
  * @property {CompatibilityItem[]} redirects list of redirects compatibility items
  */
diff --git a/scripts/build-docs.js b/scripts/build-docs.js
index e2f28e85..c785c858 100644
--- a/scripts/build-docs.js
+++ b/scripts/build-docs.js
@@ -48,7 +48,7 @@ const aboutTrustedScriptletsPath = path.resolve(
 /**
  * Collects required comments from files
  *
- * @returns {object} describing object for scriptlets and redirects
+ * @returns {Object} describing object for scriptlets and redirects
  */
 const manageDataFromFiles = () => {
     const dataFromScriptletsFiles = getDataFromFiles(
@@ -87,7 +87,7 @@ const manageDataFromFiles = () => {
  */
 
 /**
- * @typedef {object} MarkdownData
+ * @typedef {Object} MarkdownData
  * @property {string} list table of content
  * @property {string} body main content which
  */
diff --git a/scripts/build-tests.js b/scripts/build-tests.js
index 685aa0c5..090eb9cb 100644
--- a/scripts/build-tests.js
+++ b/scripts/build-tests.js
@@ -18,7 +18,7 @@ const TEST_FILE_NAME_MARKER = '.test.js';
  * @param {string} fileName test file name
  * @param {string} dirPath resolved directory path
  * @param {string} subDir subdirectory with test files
- * @returns {object} rollup config
+ * @returns {Object} rollup config
  */
 const getTestConfig = (fileName, dirPath, subDir) => {
     if (!fs.existsSync(TESTS_DIST)) {
diff --git a/scripts/check-sources-updates.js b/scripts/check-sources-updates.js
index 47e10768..f548d3e3 100644
--- a/scripts/check-sources-updates.js
+++ b/scripts/check-sources-updates.js
@@ -33,7 +33,7 @@ const areArraysOfStringsEqual = (arr1, arr2) => {
 /**
  * Returns parsed compatibility table
  *
- * @returns {object}
+ * @returns {Object}
  */
 const getCompatibilityTable = () => {
     const rawData = fs.readFileSync(COMPATIBILITY_TABLE_DATA_PATH);
@@ -64,7 +64,7 @@ const getRedirectsFromTable = (platform) => {
 };
 
 /**
- * @typedef {object} Diff
+ * @typedef {Object} Diff
  * @property {string[]} added added content
  * @property {string[]} removed removed content
  */
diff --git a/scripts/helpers.js b/scripts/helpers.js
index 83cd4b38..8dcec4ef 100644
--- a/scripts/helpers.js
+++ b/scripts/helpers.js
@@ -31,7 +31,7 @@ const getFilesList = (relativeDirPath) => {
 };
 
 /**
- * @typedef {object} CommentTag
+ * @typedef {Object} CommentTag
  * @property {string} type tag name
  * @property {string} string text following the tag
  */
@@ -77,7 +77,7 @@ Please add one OR edit the list of NON_SCRIPTLETS_FILES / NON_REDIRECTS_FILES.`)
 };
 
 /**
- * @typedef {object} DescribingCommentData
+ * @typedef {Object} DescribingCommentData
  *
  * Collected data from jsdoc-type comment for every scriptlet or redirect.
  * @property {string} type parsed instance tag:
diff --git a/src/helpers/converter.js b/src/helpers/converter.js
index 4755e4b3..51856c27 100644
--- a/src/helpers/converter.js
+++ b/src/helpers/converter.js
@@ -79,7 +79,7 @@ const getSentences = (str) => {
  * Replaces string with data by placeholders
  *
  * @param {string} str string with placeholders
- * @param {object} data - where keys are placeholders names
+ * @param {Object} data - where keys are placeholders names
  * @returns {string} string filled with data
  */
 const replacePlaceholders = (str, data) => {
@@ -362,9 +362,9 @@ export const isValidScriptletRule = (input) => {
  * Gets index and redirect resource marker from UBO/ADG modifiers array
  *
  * @param {string[]} modifiers rule modifiers
- * @param {object} redirectsData validator.REDIRECT_RULE_TYPES.(UBO|ADG)
+ * @param {Object} redirectsData validator.REDIRECT_RULE_TYPES.(UBO|ADG)
  * @param {string} rule rule string
- * @returns {object} { index, marker }
+ * @returns {Object} { index, marker }
  */
 const getMarkerData = (modifiers, redirectsData, rule) => {
     let marker;
diff --git a/src/helpers/cookie-utils.js b/src/helpers/cookie-utils.js
index 39d27f56..7bebf680 100644
--- a/src/helpers/cookie-utils.js
+++ b/src/helpers/cookie-utils.js
@@ -88,7 +88,7 @@ export const getLimitedCookieValue = (value) => {
  * Parses cookie string into object
  *
  * @param {string} cookieString string that conforms to document.cookie format
- * @returns {object} key:value object that corresponds with incoming cookies keys and values
+ * @returns {Object} key:value object that corresponds with incoming cookies keys and values
  */
 export const parseCookieString = (cookieString) => {
     const COOKIE_DELIMITER = '=';
diff --git a/src/helpers/get-descriptor-addon.js b/src/helpers/get-descriptor-addon.js
index 6e7a3c1a..1acb3909 100644
--- a/src/helpers/get-descriptor-addon.js
+++ b/src/helpers/get-descriptor-addon.js
@@ -7,7 +7,7 @@ import { randomId } from './random-id';
  * https://github.com/AdguardTeam/Scriptlets/issues/226
  * https://github.com/AdguardTeam/Scriptlets/issues/232
  *
- * @returns {object} descriptor addon
+ * @returns {Object} descriptor addon
  */
 export function getDescriptorAddon() {
     return {
diff --git a/src/helpers/get-property-in-chain.js b/src/helpers/get-property-in-chain.js
index e27f34f6..dd1f413b 100644
--- a/src/helpers/get-property-in-chain.js
+++ b/src/helpers/get-property-in-chain.js
@@ -2,7 +2,7 @@ import { isEmptyObject } from './object-utils';
 
 /**
  * @typedef ChainInfo
- * @property {object} base current chain base
+ * @property {Object} base current chain base
  * @property {string} prop current chain prop
  * @property {string} [chain] string representation
  */
@@ -14,7 +14,7 @@ import { isEmptyObject } from './object-utils';
  * defines this property as 'undefined'
  * and returns base, property name and remaining part of property chain
  *
- * @param {object} base object that owns chain
+ * @param {Object} base object that owns chain
  * @param {string} chain chain of owner properties
  * @returns {ChainInfo} chain info object
  */
diff --git a/src/helpers/get-wildcard-property-in-chain.js b/src/helpers/get-wildcard-property-in-chain.js
index 1782db98..0b139c8d 100644
--- a/src/helpers/get-wildcard-property-in-chain.js
+++ b/src/helpers/get-wildcard-property-in-chain.js
@@ -1,6 +1,6 @@
 /**
  * @typedef ChainInfo
- * @property {object} base current chain base
+ * @property {Object} base current chain base
  * @property {string} prop current chain prop
  * @property {string} [chain] string representation
  */
@@ -10,7 +10,7 @@
  * Similar to getPropertyInChain but upgraded for json-prune:
  * handle wildcard properties and does not define nonexistent base property as 'undefined'
  *
- * @param {object} base object that owns chain
+ * @param {Object} base object that owns chain
  * @param {string} chain chain of owner properties
  * @param {boolean} [lookThrough=false]
  * should the method look through it's props in order to wildcard
diff --git a/src/helpers/hit.js b/src/helpers/hit.js
index ac88b531..8d5c685d 100644
--- a/src/helpers/hit.js
+++ b/src/helpers/hit.js
@@ -3,7 +3,7 @@
 /**
  * Hit used only for debug purposes now
  *
- * @param {object} source scriptlet properties
+ * @param {Object} source scriptlet properties
  * use LOG_MARKER = 'log: ' at the start of a message
  * for logging scriptlets
  */
diff --git a/src/helpers/injector.js b/src/helpers/injector.js
index b67f0649..74a1958e 100644
--- a/src/helpers/injector.js
+++ b/src/helpers/injector.js
@@ -44,7 +44,7 @@ export function addCall(scriptlet, code) {
  *      function noeval(source) { alert(source); }
  *      noeval.apply(this, args);
  * )({"args": ["aaa", "bbb"], "name":"noeval"}, ["aaa", "bbb"])`
- * @param {object} source - object with scriptlet properties
+ * @param {Object} source - object with scriptlet properties
  * @param {string} code - scriptlet source code with dependencies
  * @param {boolean} redirect if function is redirect
  * @returns {string} full scriptlet code
diff --git a/src/helpers/log-message.js b/src/helpers/log-message.js
index ceb038ea..1a87bf5e 100644
--- a/src/helpers/log-message.js
+++ b/src/helpers/log-message.js
@@ -4,7 +4,7 @@
  * is not a part of scriptlet's functionality, eg on invalid input,
  * and use 'forced' argument otherwise.
  *
- * @param {object} source required, scriptlet properties
+ * @param {Object} source required, scriptlet properties
  * @param {string} message required, message to log
  * @param {boolean} [forced=false] to log message unconditionally
  */
diff --git a/src/helpers/match-request-props.js b/src/helpers/match-request-props.js
index be868a49..2c4f52bd 100644
--- a/src/helpers/match-request-props.js
+++ b/src/helpers/match-request-props.js
@@ -10,9 +10,9 @@ import { logMessage } from './log-message';
  * This is used by prevent-xhr, prevent-fetch, trusted-replace-xhr-response
  * and  trusted-replace-fetch-response scriptlets
  *
- * @param {object} source scriptlet properties
+ * @param {Object} source scriptlet properties
  * @param {string} propsToMatch string of space-separated request properties to match
- * @param {object} requestData object with standard properties of fetch/xhr like url, method etc
+ * @param {Object} requestData object with standard properties of fetch/xhr like url, method etc
  * @returns {boolean} if request properties match
  */
 export const matchRequestProps = (source, propsToMatch, requestData) => {
diff --git a/src/helpers/noop-utils.js b/src/helpers/noop-utils.js
index 900c7728..5e106b34 100644
--- a/src/helpers/noop-utils.js
+++ b/src/helpers/noop-utils.js
@@ -59,7 +59,7 @@ export const noopArray = () => [];
 /**
  * Function returns empty object
  *
- * @returns {object} empty object
+ * @returns {Object} empty object
  */
 export const noopObject = () => ({});
 
diff --git a/src/helpers/object-utils.js b/src/helpers/object-utils.js
index 9b05e875..d8aa5973 100644
--- a/src/helpers/object-utils.js
+++ b/src/helpers/object-utils.js
@@ -3,7 +3,7 @@
  * Object.entries() polyfill because it is not supported by IE
  * https://caniuse.com/?search=Object.entries
  *
- * @param {object} object arbitrary object
+ * @param {Object} object arbitrary object
  * @returns {Array} array of pairs
  */
 export const getObjectEntries = (object) => {
@@ -19,7 +19,7 @@ export const getObjectEntries = (object) => {
  * https://caniuse.com/?search=Object.fromEntries
  *
  * @param {Array} entries - array of pairs
- * @returns {object} result object
+ * @returns {Object} result object
  */
 export const getObjectFromEntries = (entries) => {
     const output = entries
@@ -35,7 +35,7 @@ export const getObjectFromEntries = (entries) => {
 /**
  * Checks whether the obj is an empty object
  *
- * @param {object} obj arbitrary object
+ * @param {Object} obj arbitrary object
  * @returns {boolean} if object is empty
  */
 export const isEmptyObject = (obj) => Object.keys(obj).length === 0 && !obj.prototype;
@@ -43,7 +43,7 @@ export const isEmptyObject = (obj) => Object.keys(obj).length === 0 && !obj.prot
 /**
  * Safely retrieve property descriptor
  *
- * @param {object} obj target object
+ * @param {Object} obj target object
  * @param {string} prop target property
  * @returns {object|null} descriptor or null if it's not available or non-configurable
  */
@@ -58,9 +58,9 @@ export const safeGetDescriptor = (obj, prop) => {
 /**
  * Set getter and setter to property if it's configurable
  *
- * @param {object} object target object with property
+ * @param {Object} object target object with property
  * @param {string} property property name
- * @param {object} descriptor contains getter and setter functions
+ * @param {Object} descriptor contains getter and setter functions
  * @returns {boolean} is operation successful
  */
 export function setPropertyAccess(object, property, descriptor) {
diff --git a/src/helpers/open-shadow-dom-utils.js b/src/helpers/open-shadow-dom-utils.js
index aa05e622..83797a9a 100644
--- a/src/helpers/open-shadow-dom-utils.js
+++ b/src/helpers/open-shadow-dom-utils.js
@@ -29,7 +29,7 @@ export const findHostElements = (rootElement) => {
  */
 
 /**
- * @typedef {object} PierceData
+ * @typedef {Object} PierceData
  * @property {HTMLElement[]} targets found elements that match the specified selector
  * @property {HTMLElement[]} innerHosts inner shadow-dom hosts
  */
diff --git a/src/helpers/parse-flags.js b/src/helpers/parse-flags.js
index e5d20c10..5c679f1a 100644
--- a/src/helpers/parse-flags.js
+++ b/src/helpers/parse-flags.js
@@ -1,5 +1,5 @@
 /**
- * @typedef {object} FlagsData object that holds info about valid flags
+ * @typedef {Object} FlagsData object that holds info about valid flags
  * and provides method for easy access
  * @property {string} ASAP asap flag string
  * @property {string} COMPLETE complete flag string
diff --git a/src/helpers/parse-rule.js b/src/helpers/parse-rule.js
index 254bc52c..809a8810 100644
--- a/src/helpers/parse-rule.js
+++ b/src/helpers/parse-rule.js
@@ -2,7 +2,7 @@
  * Iterate over iterable argument and evaluate current state with transitions
  *
  * @param {Array|string} iterable rule or list or rules
- * @param {object} transitions transtion functions
+ * @param {Object} transitions transtion functions
  * @param {string} init first transition name
  * @param {any} args arguments which should be passed to transition functions
  * @returns {string} state
@@ -23,7 +23,7 @@ export const ADG_SCRIPTLET_MASK = '#//scriptlet';
 /**
  * Helper to accumulate an array of strings char by char
  *
- * @returns {object} object with helper methods
+ * @returns {Object} object with helper methods
  */
 const wordSaver = () => {
     let str = '';
@@ -72,8 +72,8 @@ export const parseRule = (ruleText) => {
      *
      * @param {string} rule rule string
      * @param {number} index index
-     * @param {object} Object helper object
-     * @param {object} Object.sep contains prop symb with current separator char
+     * @param {Object} Object helper object
+     * @param {Object} Object.sep contains prop symb with current separator char
      * @throws {string} throws if given rule is not a scriptlet
      * @returns {string} transition
      */
@@ -111,9 +111,9 @@ export const parseRule = (ruleText) => {
      *
      * @param {string} rule rule string
      * @param {number} index index
-     * @param {object} Object helper object
-     * @param {object} Object.sep contains prop `symb` with current separator char
-     * @param {object} Object.saver helper which allow to save strings by car by char
+     * @param {Object} Object helper object
+     * @param {Object} Object.sep contains prop `symb` with current separator char
+     * @param {Object} Object.saver helper which allow to save strings by car by char
      * @returns {void}
      */
     const param = (rule, index, { saver, sep }) => {
diff --git a/src/helpers/prevent-utils.js b/src/helpers/prevent-utils.js
index 3df656f4..e7534f1b 100644
--- a/src/helpers/prevent-utils.js
+++ b/src/helpers/prevent-utils.js
@@ -38,7 +38,7 @@ export const parseRawDelay = (delay) => {
  * by given parameters 'matchCallback' and 'matchDelay'.
  * Used for prevent-setTimeout and prevent-setInterval.
  *
- * @param {object} preventData set of data to determine if scriptlet should match
+ * @param {Object} preventData set of data to determine if scriptlet should match
  * @param {Function} preventData.callback method's callback arg
  * @param {any} preventData.delay method's delay arg
  * @param {string} preventData.matchCallback scriptlets's callback arg
diff --git a/src/helpers/request-utils.js b/src/helpers/request-utils.js
index 1d68792f..33c39e9a 100644
--- a/src/helpers/request-utils.js
+++ b/src/helpers/request-utils.js
@@ -27,7 +27,7 @@ export const getRequestProps = () => [
  * Collects Request options to object
  *
  * @param {Request} request Request instance to collect properties from
- * @returns {object} data object
+ * @returns {Object} data object
  */
 export const getRequestData = (request) => {
     const requestInitOptions = getRequestProps();
@@ -44,7 +44,7 @@ export const getRequestData = (request) => {
  * Collects fetch args to object
  *
  * @param {*} args fetch args
- * @returns {object} data object
+ * @returns {Object} data object
  */
 export const getFetchData = (args) => {
     const fetchPropsObj = {};
@@ -79,7 +79,7 @@ export const getFetchData = (args) => {
  * @param {string} async request async prop
  * @param {string} user request user prop
  * @param {string} password request password prop
- * @returns {object} aggregated request data
+ * @returns {Object} aggregated request data
  */
 export const getXhrData = (method, url, async, user, password) => {
     return {
@@ -96,7 +96,7 @@ export const getXhrData = (method, url, async, user, password) => {
  * used for prevent-fetch and prevent-xhr
  *
  * @param {string} propsToMatchStr string of space-separated request properties to match
- * @returns {object} object where 'key' is prop name and 'value' is prop value
+ * @returns {Object} object where 'key' is prop name and 'value' is prop value
  */
 export const parseMatchProps = (propsToMatchStr) => {
     const PROPS_DIVIDER = ' ';
@@ -129,7 +129,7 @@ export const parseMatchProps = (propsToMatchStr) => {
 /**
  * Validates parsed data values
  *
- * @param {object} data request data
+ * @param {Object} data request data
  * @returns {boolean} if data is valid
  */
 export const validateParsedData = (data) => {
@@ -140,8 +140,8 @@ export const validateParsedData = (data) => {
 /**
  * Converts valid parsed data to data obj for further matching
  *
- * @param {object} data parsed request data
- * @returns {object} data obj ready for matching
+ * @param {Object} data parsed request data
+ * @returns {Object} data obj ready for matching
  */
 export const getMatchPropsData = (data) => {
     const matchData = {};
diff --git a/src/helpers/storage-utils.js b/src/helpers/storage-utils.js
index ff7e35e2..acdb3e36 100644
--- a/src/helpers/storage-utils.js
+++ b/src/helpers/storage-utils.js
@@ -4,7 +4,7 @@ import { logMessage } from './log-message';
 /**
  * Sets item to a specified storage, if storage isn't full.
  *
- * @param {object} source scriptlet's configuration
+ * @param {Object} source scriptlet's configuration
  * @param {Storage} storage storage instance to set item into
  * @param {string} key storage key
  * @param {string} value staroge value
diff --git a/src/helpers/string-utils.js b/src/helpers/string-utils.js
index 45fcc5e6..09f94770 100644
--- a/src/helpers/string-utils.js
+++ b/src/helpers/string-utils.js
@@ -223,7 +223,7 @@ export const isValidMatchNumber = (match) => {
 };
 
 /**
- * @typedef {object} MatchData
+ * @typedef {Object} MatchData
  * @property {boolean} isInvertedMatch if matching should be inverted
  * @property {RegExp} matchRegexp match value parsed into regex
  */
@@ -245,7 +245,7 @@ export const parseMatchArg = (match) => {
 };
 
 /**
- * @typedef {object} DelayData
+ * @typedef {Object} DelayData
  * @property {boolean} isInvertedDelayMatch if matching should be inverted
  * @property {number|null} delayMatch parsed delay or null if delay is invalid
  */
@@ -269,7 +269,7 @@ export const parseDelayArg = (delay) => {
 /**
  * Converts object to string for logging
  *
- * @param {object} obj data object
+ * @param {Object} obj data object
  * @returns {string} object's string representation
  */
 export const objectToString = (obj) => {
diff --git a/src/redirects/blocking-redirects/click2load.js b/src/redirects/blocking-redirects/click2load.js
index ee5545b4..e0f19f7b 100644
--- a/src/redirects/blocking-redirects/click2load.js
+++ b/src/redirects/blocking-redirects/click2load.js
@@ -29,7 +29,7 @@ function clickToLoad() {
      * because frame will be shown anyway if click2load redirect rule used
      *
      * @param {string} rawQueryStr
-     * @returns {object} key is parameter name and value is parameter value
+     * @returns {Object} key is parameter name and value is parameter value
      */
     const parseSearchParam = (rawQueryStr) => {
         const res = {};
@@ -125,7 +125,7 @@ function clickToLoad() {
      * Returns translations data for navigator.language
      * or 'en' if navigator.language is not supported
      *
-     * @returns {object} data for one locale with 'title' and 'button' keys
+     * @returns {Object} data for one locale with 'title' and 'button' keys
      */
     const getTranslations = () => {
         const baseLocaleData = translationsData.en;
diff --git a/src/redirects/index.js b/src/redirects/index.js
index ba2efe96..6b9b8244 100644
--- a/src/redirects/index.js
+++ b/src/redirects/index.js
@@ -32,7 +32,7 @@ const getRedirectByName = (name) => {
 };
 
 /**
- * @typedef {object} Source - redirect properties
+ * @typedef {Object} Source - redirect properties
  * @property {string} name redirect name
  * @property {Array<string>} args Arguments for redirect function
  * @property {'extension'|'test'} [engine] -
diff --git a/src/redirects/metrika-yandex-tag.js b/src/redirects/metrika-yandex-tag.js
index 0a5f9762..a432926b 100644
--- a/src/redirects/metrika-yandex-tag.js
+++ b/src/redirects/metrika-yandex-tag.js
@@ -69,7 +69,7 @@ export function metrikaYandexTag(source) {
      *
      * @param {string} id
      * @param {string} target
-     * @param {object} params
+     * @param {Object} params
      * @param {Function} callback
      * @param {any} ctx
      */
diff --git a/src/redirects/metrika-yandex-watch.js b/src/redirects/metrika-yandex-watch.js
index 03f5a57d..f2646de7 100644
--- a/src/redirects/metrika-yandex-watch.js
+++ b/src/redirects/metrika-yandex-watch.js
@@ -17,7 +17,7 @@ export function metrikaYandexWatch(source) {
     /**
      * Gets callback and its context from options and call it in async way
      *
-     * @param {object} options Yandex Metrika API options
+     * @param {Object} options Yandex Metrika API options
      */
     const asyncCallbackFromOptions = (options = {}) => {
         let { callback } = options;
diff --git a/src/redirects/redirects.js b/src/redirects/redirects.js
index 8e2fa182..5d90c806 100644
--- a/src/redirects/redirects.js
+++ b/src/redirects/redirects.js
@@ -10,7 +10,7 @@ import jsYaml from 'js-yaml';
  *      content: R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==
  * }
  *
- * @typedef {object} Redirect
+ * @typedef {Object} Redirect
  * @property {string} title resource name
  * @property {string} comment resource description
  * @property {string} content encoded resource content
diff --git a/src/scriptlets/index.js b/src/scriptlets/index.js
index 300c6b8b..bf9e9242 100644
--- a/src/scriptlets/index.js
+++ b/src/scriptlets/index.js
@@ -14,7 +14,7 @@ import {
 import { getScriptletFunction } from '../../tmp/scriptlets-func';
 
 /**
- * @typedef {object} Source - scriptlet properties
+ * @typedef {Object} Source - scriptlet properties
  * @property {string} name Scriptlet name
  * @property {Array<string>} args Arguments for scriptlet function
  * @property {'extension'|'corelibs'|'test'} engine -
@@ -28,7 +28,7 @@ import { getScriptletFunction } from '../../tmp/scriptlets-func';
 /**
  * Returns scriptlet code by param
  *
- * @param {Source} source
+ * @param {Object} source scriptlet properties
  * @returns {string|null} scriptlet code
  * @throws on unknown scriptlet name
  */
@@ -54,7 +54,7 @@ function getScriptletCode(source) {
 /**
  * Scriptlets variable
  *
- * @returns {object} object with methods:
+ * @returns {Object} object with methods:
  * `invoke` method receives one argument with `Source` type
  * `validate` method receives one argument with `String` type
  */
diff --git a/src/scriptlets/json-prune.js b/src/scriptlets/json-prune.js
index a1457e4f..d0bb1480 100644
--- a/src/scriptlets/json-prune.js
+++ b/src/scriptlets/json-prune.js
@@ -156,8 +156,8 @@ export function jsonPrune(source, propsToRemove, requiredInitialProps, stack) {
     /**
      * Prunes properties of 'root' object
      *
-     * @param {object} root
-     * @returns {object} pruned root
+     * @param {Object} root
+     * @returns {Object} pruned root
      */
     const jsonPruner = (root) => {
         if (prunePaths.length === 0 && requiredPaths.length === 0) {