diff --git a/.githooks/pre-commit b/.githooks/pre-commit
new file mode 100755
index 000000000..19fe2539c
--- /dev/null
+++ b/.githooks/pre-commit
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+yarn checkIcons
+echo $?
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 000000000..b58b603fe
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,5 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/.idea/codeStyles/Project.xml b/.idea/codeStyles/Project.xml
new file mode 100644
index 000000000..ac6ddd4e3
--- /dev/null
+++ b/.idea/codeStyles/Project.xml
@@ -0,0 +1,8 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <option name="LINE_SEPARATOR" value="&#10;" />
+    <HTMLCodeStyleSettings>
+      <option name="HTML_SPACE_INSIDE_EMPTY_TAG" value="true" />
+    </HTMLCodeStyleSettings>
+  </code_scheme>
+</component>
\ No newline at end of file
diff --git a/.idea/codeStyles/codeStyleConfig.xml b/.idea/codeStyles/codeStyleConfig.xml
new file mode 100644
index 000000000..307554b77
--- /dev/null
+++ b/.idea/codeStyles/codeStyleConfig.xml
@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>
\ No newline at end of file
diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
new file mode 100644
index 000000000..9c6941105
--- /dev/null
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -0,0 +1,7 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="Eslint" enabled="true" level="WARNING" enabled_by_default="true" />
+    <inspection_tool class="TsLint" enabled="true" level="WARNING" enabled_by_default="true" />
+  </profile>
+</component>
\ No newline at end of file
diff --git a/.idea/lucide.iml b/.idea/lucide.iml
new file mode 100644
index 000000000..0b872d82d
--- /dev/null
+++ b/.idea/lucide.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/.tmp" />
+      <excludeFolder url="file://$MODULE_DIR$/temp" />
+      <excludeFolder url="file://$MODULE_DIR$/tmp" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 000000000..ef004d16c
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
new file mode 100644
index 000000000..e9b95cfdd
--- /dev/null
+++ b/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/lucide.iml" filepath="$PROJECT_DIR$/.idea/lucide.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 000000000..9661ac713
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/icons.json b/icons.json
index 5ae07710a..aa568e297 100644
--- a/icons.json
+++ b/icons.json
@@ -4882,4 +4882,4 @@
       "icon": "cloud-sun"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/package.json b/package.json
index 001a34d85..279da02c0 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,8 @@
     "addtags": "babel-node ./scripts/addMissingKeysToTags.js --presets @babel/env",
     "tags2icons": "babel-node ./scripts/migrateTagsToIcons.js --presets @babel/env",
     "icons2tags": "babel-node ./scripts/migrateIconsToTags.js --presets @babel/env",
-    "generate:changelog": "babel-node ./scripts/generateChangelog.js --presets @babel/env"
+    "generate:changelog": "babel-node ./scripts/generateChangelog.js --presets @babel/env",
+    "checkIcons": "babel-node ./scripts/checkIconsAndCategories.js --presets @babel/env"
   },
   "devDependencies": {
     "@ampproject/rollup-plugin-closure-compiler": "^0.25.2",
diff --git a/scripts/checkIconsAndCategories.js b/scripts/checkIconsAndCategories.js
new file mode 100644
index 000000000..6fcdbd738
--- /dev/null
+++ b/scripts/checkIconsAndCategories.js
@@ -0,0 +1,49 @@
+import path from 'path';
+import icons from '../icons.json';
+import {readSvgDirectory} from './helpers';
+
+const ICONS_DIR = path.resolve(__dirname, '../icons');
+
+console.log(`Read all icons`);
+
+const svgFiles = readSvgDirectory(ICONS_DIR);
+
+const iconNames = svgFiles.map(icon => icon.split('.')[0]);
+
+let error = false;
+
+iconNames.forEach(iconName => {
+  if (typeof icons.icons[iconName] === 'undefined') {
+    console.error(`'${iconName}.svg' is not present in 'icons.json'.`);
+    error = true;
+  }
+});
+
+Object.keys(icons.icons).forEach(iconName => {
+  const icon = icons.icons[iconName];
+  if (iconNames.indexOf(iconName) === -1) {
+    console.error(`'${iconName}.svg' does not exist.`);
+    error = true;
+  }
+  icon.categories.forEach(categoryName => {
+    if (typeof icons.categories[categoryName] === 'undefined') {
+      console.error(`Icon '${iconName}' refers to the non-existing category '${categoryName}'.`);
+      error = true;
+    }
+  });
+});
+
+Object.keys(icons.categories).forEach(categoryName => {
+  const category = icons.categories[categoryName];
+  if (!category.icon) {
+    console.error(`Category '${categoryName}' does not use an icon '${category.icon}'.`);
+    error = true;
+  } else if (typeof icons.icons[category.icon] === 'undefined') {
+    console.error(`Category '${categoryName}' uses the non-existing icon '${category.icon}'.`);
+    error = true;
+  }
+});
+
+if (error) {
+  throw new Error('At least one error in icons.json prevents from committing changes.');
+}