diff --git a/index.d.ts b/index.d.ts
index f4c1b91..b94e1c1 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -214,39 +214,6 @@ export namespace Parser {
 
     satisfies(checkTree: checkTree): boolean | undefined;
 
-    /**
-     * Check if the browser name equals the passed string
-     * @param {string} browserName The string to compare with the browser name
-     * @param [includingAlias=false] The flag showing whether alias will be included into comparison
-     * @returns {boolean}
-     */
-
-    isBrowser(browserName: string, includingAlias?: boolean): boolean;
-
-    /**
-     * Check if the engine name equals the passed string
-     * @param {string} engineName The string to compare with the engine name
-     * @returns {boolean}
-     */
-
-    isEngine(engineName: string): boolean;
-
-    /**
-     * Check if the platform type equals the passed string
-     * @param {string} platformType The string to compare with the platform type
-     * @returns {boolean}
-     */
-
-    isPlatform(platformType: string): boolean;
-
-    /**
-     * Check if the OS name equals the passed string
-     * @param {string} osName The string to compare with the OS name
-     * @returns {boolean}
-     */
-
-    isOS(osName: string): boolean;
-
     /**
      * Check if any of the given values satisfies `.is(anything)`
      * @param {string[]} anythings