diff --git a/packages/core/src/api/modules/fetch.ts b/packages/core/src/api/modules/fetch.ts
index 60ebc4e..a8db199 100644
--- a/packages/core/src/api/modules/fetch.ts
+++ b/packages/core/src/api/modules/fetch.ts
@@ -11,7 +11,7 @@ import { GetAPIConfig } from '../config';
 /**
  * Endpoint
  */
-let endPoint = '{prefix}.json?icons={icons}';
+const endPoint = '{prefix}.json?icons={icons}';
 
 /**
  * Cache
@@ -120,7 +120,7 @@ export const getAPIModule: GetIconifyAPIModule = (
 		const iconsList = icons.join(',');
 
 		const cacheKey = provider + ':' + prefix;
-		let path =
+		const path =
 			pathCache[cacheKey] +
 			endPoint
 				.replace('{provider}', provider)
@@ -144,7 +144,9 @@ export const getAPIModule: GetIconifyAPIModule = (
 				// Store cache and complete
 				status.done(data);
 			})
-			.catch((err) => {});
+			.catch(() => {
+				//
+			});
 	};
 
 	// Return functions
diff --git a/packages/core/src/icon/index.ts b/packages/core/src/icon/index.ts
index 85590d8..81cb9d4 100644
--- a/packages/core/src/icon/index.ts
+++ b/packages/core/src/icon/index.ts
@@ -2,7 +2,7 @@ import { IconifyIcon } from '@iconify/types';
 import { merge } from '../misc/merge';
 
 export { IconifyIcon };
-export type FullIconifyIcon = Required<IconifyIcon>;
+export type FullIconifyIcon = Omit<Required<IconifyIcon>, 'hidden'>;
 
 /**
  * Default values for IconifyIcon properties
@@ -22,5 +22,5 @@ export const iconDefaults: FullIconifyIcon = Object.freeze({
  * Create new icon with all properties
  */
 export function fullIcon(icon: IconifyIcon): FullIconifyIcon {
-	return merge(iconDefaults, icon) as FullIconifyIcon;
+	return merge(iconDefaults, icon as FullIconifyIcon) as FullIconifyIcon;
 }
diff --git a/packages/types/.gitignore b/packages/types/.gitignore
new file mode 100644
index 0000000..9daa824
--- /dev/null
+++ b/packages/types/.gitignore
@@ -0,0 +1,2 @@
+.DS_Store
+node_modules
diff --git a/packages/types/package-lock.json b/packages/types/package-lock.json
new file mode 100644
index 0000000..2f8f431
--- /dev/null
+++ b/packages/types/package-lock.json
@@ -0,0 +1,14 @@
+{
+	"name": "@iconify/types",
+	"version": "1.0.5",
+	"lockfileVersion": 1,
+	"requires": true,
+	"dependencies": {
+		"typescript": {
+			"version": "4.0.5",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.5.tgz",
+			"integrity": "sha512-ywmr/VrTVCmNTJ6iV2LwIrfG1P+lv6luD8sUJs+2eI9NLGigaN+nUQc13iHqisq7bra9lnmUSYqbJvegraBOPQ==",
+			"dev": true
+		}
+	}
+}
diff --git a/packages/types/package.json b/packages/types/package.json
index 2defe32..f4c8cbf 100644
--- a/packages/types/package.json
+++ b/packages/types/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "@iconify/types",
 	"description": "Types for Iconify data",
-	"version": "1.0.4",
+	"version": "1.0.5",
 	"author": "Vjacheslav Trushkin",
 	"license": "(Apache-2.0 OR GPL-2.0)",
 	"main": "./index.js",
@@ -16,6 +16,8 @@
 		"url": "https://github.com/iconify/iconify.git",
 		"directory": "packages/types"
 	},
-	"devDependencies": {},
+	"devDependencies": {
+		"typescript": "^4.0.5"
+	},
 	"dependencies": {}
 }
diff --git a/packages/types/types.ts b/packages/types/types.ts
index ff9bf69..1b549ff 100644
--- a/packages/types/types.ts
+++ b/packages/types/types.ts
@@ -54,10 +54,7 @@ export interface IconifyTransformations {
 export interface IconifyOptional
 	extends IconifyDimenisons,
 		IconifyTransformations {
-	// True if icon is hidden.
-	// Used in icon sets to keep icons that no longer exist, but should still be accessible
-	// from API, preventing websites from breaking when icon is removed by developer.
-	hidden?: boolean;
+	//
 }
 
 /**
@@ -83,20 +80,33 @@ export interface IconifyIcon extends IconifyOptional {
 	// If property is missing in JSON file, look in root object for default value.
 }
 
+/**
+ * Icon with optional parameters that are provided by API and affect only search
+ */
+interface APIIconAttributes {
+	// True if icon is hidden.
+	// Used in icon sets to keep icons that no longer exist, but should still be accessible
+	// from API, preventing websites from breaking when icon is removed by developer.
+	hidden?: boolean;
+}
+
+export interface ExtendedIconifyIcon extends IconifyIcon, APIIconAttributes {}
+export interface ExtendedIconifyAlias extends IconifyAlias, APIIconAttributes {}
+
 /**
  * "icons" field of JSON file.
  */
 export interface IconifyIcons {
-	// Index is name of icon, without prefix. Value is IconifyIcon object.
-	[index: string]: IconifyIcon;
+	// Index is name of icon, without prefix. Value is ExtendedIconifyIcon object.
+	[index: string]: ExtendedIconifyIcon;
 }
 
 /**
  * "aliases" field of JSON file.
  */
 export interface IconifyAliases {
-	// Index is name of icon, without prefix. Value is IconifyAlias object.
-	[index: string]: IconifyAlias;
+	// Index is name of icon, without prefix. Value is ExtendedIconifyAlias object.
+	[index: string]: ExtendedIconifyAlias;
 }
 
 /**