diff --git a/.eslintrc.json b/.eslintrc.json
index c498c3d..44f9aa8 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -4,5 +4,9 @@
 		"wikimedia/client",
 		"wikimedia/jquery",
 		"wikimedia/mediawiki"
-	]
+	],
+	"rules": {
+		// Interferes with @type annotations.
+		"one-var": "off"
+	}
 }
diff --git a/includes/templates/Portal.mustache b/includes/templates/Portal.mustache
index 62a25e8..853e925 100644
--- a/includes/templates/Portal.mustache
+++ b/includes/templates/Portal.mustache
@@ -3,11 +3,11 @@ Each portal has the following composition:
 	string portal-id
 	string html-tooltip
 	string msg-label-id
-	string|null html-userlangattributes
-	string msg-label}
+	string? html-userlangattributes
+	string msg-label
 	string html-portal-content
-	string|null html-after-portal
-	string|null html-hook-vector-after-toolbox is deprecated and used by the toolbox portal.
+	string? html-after-portal
+	string? html-hook-vector-after-toolbox is deprecated and used by the toolbox portal.
 }}
 <div class="portal" role="navigation" id="{{portal-id}}" {{{html-tooltip}}} aria-labelledby="{{msg-label-id}}">
 	<h3 {{{html-userlangattributes}}} id="{{msg-label-id}}">
diff --git a/package-lock.json b/package-lock.json
index c689e1f..522332c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1455,12 +1455,27 @@
 			"integrity": "sha512-iTs9HReBu7evG77Q4EC8hZnqRt57irBDkK9nvmHroiOIVwYMQc4IvYvdRgwKfYepunIY7Oh/dBuuld+Gj9uo6w==",
 			"dev": true
 		},
+		"@types/jquery": {
+			"version": "3.3.33",
+			"resolved": "https://registry.npmjs.org/@types/jquery/-/jquery-3.3.33.tgz",
+			"integrity": "sha512-U6IdXYGkfUI42SR79vB2Spj+h1Ly3J3UZjpd8mi943lh126TK7CB+HZOxGh2nM3IySor7wqVQdemD/xtydsBKA==",
+			"dev": true,
+			"requires": {
+				"@types/sizzle": "*"
+			}
+		},
 		"@types/minimist": {
 			"version": "1.2.0",
 			"resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.0.tgz",
 			"integrity": "sha1-aaI6OtKcrwCX8G7aWbNh7i8GOfY=",
 			"dev": true
 		},
+		"@types/mustache": {
+			"version": "4.0.1",
+			"resolved": "https://registry.npmjs.org/@types/mustache/-/mustache-4.0.1.tgz",
+			"integrity": "sha512-wH6Tu9mbiOt0n5EvdoWy0VGQaJMHfLIxY/6wS0xLC7CV1taM6gESEzcYy0ZlWvxxiiljYvfDIvz4hHbUUDRlhw==",
+			"dev": true
+		},
 		"@types/node": {
 			"version": "13.9.1",
 			"resolved": "https://registry.npmjs.org/@types/node/-/node-13.9.1.tgz",
@@ -1529,6 +1544,12 @@
 				"@types/react": "*"
 			}
 		},
+		"@types/sizzle": {
+			"version": "2.3.2",
+			"resolved": "https://registry.npmjs.org/@types/sizzle/-/sizzle-2.3.2.tgz",
+			"integrity": "sha512-7EJYyKTL7tFR8+gDbB6Wwz/arpGa0Mywk1TJbNzKzHtzbwVmY4HR9WqS5VV7dsBUKQmPNr192jHr/VpBluj/hg==",
+			"dev": true
+		},
 		"@types/unist": {
 			"version": "2.0.3",
 			"resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.3.tgz",
@@ -2125,8 +2146,7 @@
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
 			"integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
-			"dev": true,
-			"optional": true
+			"dev": true
 		},
 		"assign-symbols": {
 			"version": "1.0.0",
@@ -3430,7 +3450,6 @@
 			"resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
 			"integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
 			"dev": true,
-			"optional": true,
 			"requires": {
 				"delayed-stream": "~1.0.0"
 			}
@@ -3938,8 +3957,7 @@
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
 			"integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
-			"dev": true,
-			"optional": true
+			"dev": true
 		},
 		"delegate": {
 			"version": "3.2.0",
@@ -5148,8 +5166,7 @@
 			"version": "1.3.0",
 			"resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
 			"integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
-			"dev": true,
-			"optional": true
+			"dev": true
 		},
 		"fast-deep-equal": {
 			"version": "2.0.1",
@@ -5613,8 +5630,7 @@
 				"ansi-regex": {
 					"version": "2.1.1",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"aproba": {
 					"version": "1.2.0",
@@ -5635,14 +5651,12 @@
 				"balanced-match": {
 					"version": "1.0.0",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"brace-expansion": {
 					"version": "1.1.11",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"balanced-match": "^1.0.0",
 						"concat-map": "0.0.1"
@@ -5657,20 +5671,17 @@
 				"code-point-at": {
 					"version": "1.1.0",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"concat-map": {
 					"version": "0.0.1",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"console-control-strings": {
 					"version": "1.1.0",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"core-util-is": {
 					"version": "1.0.2",
@@ -5787,8 +5798,7 @@
 				"inherits": {
 					"version": "2.0.4",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"ini": {
 					"version": "1.3.5",
@@ -5800,7 +5810,6 @@
 					"version": "1.0.0",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"number-is-nan": "^1.0.0"
 					}
@@ -5815,7 +5824,6 @@
 					"version": "3.0.4",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"brace-expansion": "^1.1.7"
 					}
@@ -5823,14 +5831,12 @@
 				"minimist": {
 					"version": "0.0.8",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"minipass": {
 					"version": "2.9.0",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"safe-buffer": "^5.1.2",
 						"yallist": "^3.0.0"
@@ -5849,7 +5855,6 @@
 					"version": "0.5.1",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"minimist": "0.0.8"
 					}
@@ -5939,8 +5944,7 @@
 				"number-is-nan": {
 					"version": "1.0.1",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"object-assign": {
 					"version": "4.1.1",
@@ -5952,7 +5956,6 @@
 					"version": "1.4.0",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"wrappy": "1"
 					}
@@ -6038,8 +6041,7 @@
 				"safe-buffer": {
 					"version": "5.1.2",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"safer-buffer": {
 					"version": "2.1.2",
@@ -6075,7 +6077,6 @@
 					"version": "1.0.2",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"code-point-at": "^1.0.0",
 						"is-fullwidth-code-point": "^1.0.0",
@@ -6095,7 +6096,6 @@
 					"version": "3.0.1",
 					"bundled": true,
 					"dev": true,
-					"optional": true,
 					"requires": {
 						"ansi-regex": "^2.0.0"
 					}
@@ -6139,14 +6139,12 @@
 				"wrappy": {
 					"version": "1.0.2",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				},
 				"yallist": {
 					"version": "3.1.1",
 					"bundled": true,
-					"dev": true,
-					"optional": true
+					"dev": true
 				}
 			}
 		},
@@ -7391,8 +7389,7 @@
 			"version": "0.1.1",
 			"resolved": "https://registry.npmjs.org/jsbn/-/jsbn-0.1.1.tgz",
 			"integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
-			"dev": true,
-			"optional": true
+			"dev": true
 		},
 		"jsdoc": {
 			"version": "3.6.3",
@@ -11871,8 +11868,7 @@
 			"version": "0.14.5",
 			"resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
 			"integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-			"dev": true,
-			"optional": true
+			"dev": true
 		},
 		"type-check": {
 			"version": "0.3.2",
@@ -11920,6 +11916,12 @@
 				"is-typedarray": "^1.0.0"
 			}
 		},
+		"typescript": {
+			"version": "3.8.3",
+			"resolved": "https://registry.npmjs.org/typescript/-/typescript-3.8.3.tgz",
+			"integrity": "sha512-MYlEfn5VrLNsgudQTVJeNaQFUAI7DkhnOjdpAp4T+ku1TfQClewlbSuTVHiA+8skNBgaf02TL/kLOvig4y3G8w==",
+			"dev": true
+		},
 		"uc.micro": {
 			"version": "1.0.6",
 			"resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.6.tgz",
diff --git a/package.json b/package.json
index 09ffd12..e5ded27 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
 	"private": true,
 	"scripts": {
 		"build": "npm -s test && npm -s run doc",
-		"test": "npm -s run lint",
+		"test": "npm -s run lint && tsc",
 		"lint": "npm -s run lint:js && npm -s run lint:styles && npm -s run lint:i18n",
 		"lint:fix": "npm -s run lint:js -- --fix && npm -s run lint:styles -- --fix",
 		"lint:js": "eslint --cache --max-warnings 0 .",
@@ -16,6 +16,8 @@
 	"devDependencies": {
 		"@babel/core": "7.7.7",
 		"@storybook/html": "5.2.8",
+		"@types/jquery": "3.3.33",
+		"@types/mustache": "4.0.1",
 		"babel-loader": "8.0.6",
 		"eslint-config-wikimedia": "0.15.0",
 		"grunt-banana-checker": "0.8.1",
@@ -26,6 +28,7 @@
 		"mustache": "3.0.1",
 		"pre-commit": "1.2.2",
 		"stylelint-config-wikimedia": "0.9.0",
-		"svgo": "1.3.2"
+		"svgo": "1.3.2",
+		"typescript": "3.8.3"
 	}
 }
diff --git a/resources/CollapsibleTabsPlugin.d.ts b/resources/CollapsibleTabsPlugin.d.ts
new file mode 100644
index 0000000..dd9b196
--- /dev/null
+++ b/resources/CollapsibleTabsPlugin.d.ts
@@ -0,0 +1,34 @@
+interface JQueryStatic {
+	collapsibleTabs: CollapsibleTabsStatic;
+}
+
+interface JQuery {
+	collapsibleTabs(options: Partial<CollapsibleTabsOptions>): void;
+}
+
+/** A jQuery plugin that makes collapsible tabs for the Vector skin. */
+interface CollapsibleTabsOptions {
+	/** Optional tab selector. Defaults to `#p-views ul`. */
+	expandedContainer: string;
+	/** Optional menu item selector. Defaults to `#p-cactions ul`. */
+	collapsedContainer: string;
+	/** Optional selector for tabs that are collapsible. Defaults to `li.collapsible`. */
+	collapsible: string;
+	shifting: boolean;
+	expandedWidth: number;
+	expandCondition(eleWidth: number): boolean;
+	collapseCondition(): boolean;
+}
+
+interface CollapsibleTabsStatic {
+	defaults: CollapsibleTabsOptions;
+	instances: JQuery[];
+	addData($collapsible: JQuery): void;
+	getSettings($collapsible: JQuery): CollapsibleTabsOptions;
+	handleResize(): void;
+	moveToCollapsed($moving: JQuery): void;
+	moveToExpanded($moving: JQuery): void;
+	calculateTabDistance(): number;
+}
+
+interface CollapsibleTabs extends CollapsibleTabsStatic, CollapsibleTabsOptions {}
diff --git a/resources/mediawiki.d.ts b/resources/mediawiki.d.ts
new file mode 100644
index 0000000..ce06836
--- /dev/null
+++ b/resources/mediawiki.d.ts
@@ -0,0 +1,20 @@
+interface MediaWiki {
+	util: {
+		/**
+		 * Return a wrapper function that is debounced for the given duration.
+		 *
+		 * When it is first called, a timeout is scheduled. If before the timer
+		 * is reached the wrapper is called again, it gets rescheduled for the
+		 * same duration from now until it stops being called. The original function
+		 * is called from the "tail" of such chain, with the last set of arguments.
+		 *
+		 * @since 1.34
+		 * @param {number} delay Time in milliseconds
+		 * @param {Function} callback
+		 * @return {Function}
+		 */
+		debounce(delay: number, callback: Function): () => void;
+	};
+}
+
+declare const mw: MediaWiki;
diff --git a/resources/skins.vector.js/collapsibleTabs.js b/resources/skins.vector.js/collapsibleTabs.js
index 42665ce..778499f 100644
--- a/resources/skins.vector.js/collapsibleTabs.js
+++ b/resources/skins.vector.js/collapsibleTabs.js
@@ -1,19 +1,9 @@
+/** @interface CollapsibleTabsOptions */
 ( function () {
-	var boundEvent,
-		isRTL = document.documentElement.dir === 'rtl',
-		rAF = window.requestAnimationFrame || setTimeout;
+	/** @type {boolean|undefined} */ var boundEvent;
+	var isRTL = document.documentElement.dir === 'rtl';
+	var rAF = window.requestAnimationFrame || setTimeout;
 
-	/**
-	 * A jQuery plugin that makes collapsible tabs for the Vector skin.
-	 *
-	 * @class jQuery.plugin.collapsibleTabs
-	 * @param {Object} [options]
-	 * @param {string} [options.expandedContainer=#p-views ul] List of tabs
-	 * @param {string} [options.collapsedContainer=#p-cactions ul] List of menu items
-	 * @param {string} [options.collapsible=li.collapsible] Match tabs that are collapsible
-	 * @param {Function} [options.expandCondition]
-	 * @param {Function} [options.collapseCondition]
-	 */
 	$.fn.collapsibleTabs = function ( options ) {
 		// Merge options into the defaults
 		var settings = $.extend( {}, $.collapsibleTabs.defaults, options );
@@ -54,6 +44,7 @@
 			collapsedContainer: '#p-cactions ul',
 			collapsible: 'li.collapsible',
 			shifting: false,
+			expandedWidth: 0,
 			expandCondition: function ( eleWidth ) {
 				// If there are at least eleWidth + 1 pixels of free space, expand.
 				// We add 1 because .width() will truncate fractional values but .offset() will not.
@@ -125,19 +116,21 @@
 			} );
 		},
 		moveToCollapsed: function ( $moving ) {
-			var outerData, expContainerSettings, target;
+			/** @type {CollapsibleTabsOptions} */ var outerData;
+			/** @type {CollapsibleTabsOptions} */ var collapsedContainerSettings;
+			/** @type {string} */ var target;
 
 			outerData = $.collapsibleTabs.getSettings( $moving );
 			if ( !outerData ) {
 				return;
 			}
-			expContainerSettings = $.collapsibleTabs.getSettings(
+			collapsedContainerSettings = $.collapsibleTabs.getSettings(
 				$( outerData.expandedContainer )
 			);
-			if ( !expContainerSettings ) {
+			if ( !collapsedContainerSettings ) {
 				return;
 			}
-			expContainerSettings.shifting = true;
+			collapsedContainerSettings.shifting = true;
 
 			// Remove the element from where it's at and put it in the dropdown menu
 			target = outerData.collapsedContainer;
@@ -150,22 +143,26 @@
 					$( '<span>' ).addClass( 'placeholder' ).css( 'display', 'none' ).insertAfter( this );
 					$( this ).detach().prependTo( target ).data( 'collapsibleTabsSettings', outerData );
 					$( this ).attr( 'style', 'display: list-item;' );
-					expContainerSettings.shifting = false;
+					collapsedContainerSettings.shifting = false;
 					rAF( $.collapsibleTabs.handleResize );
 				} );
 		},
 		moveToExpanded: function ( $moving ) {
-			var data, expContainerSettings, $target, expandedWidth;
+			/** @type {CollapsibleTabsOptions} */ var data;
+			/** @type {CollapsibleTabsOptions} */ var expandedContainerSettings;
+			var $target;
+			var expandedWidth;
 
 			data = $.collapsibleTabs.getSettings( $moving );
 			if ( !data ) {
 				return;
 			}
-			expContainerSettings = $.collapsibleTabs.getSettings( $( data.expandedContainer ) );
-			if ( !expContainerSettings ) {
+			expandedContainerSettings =
+				$.collapsibleTabs.getSettings( $( data.expandedContainer ) );
+			if ( !expandedContainerSettings ) {
 				return;
 			}
-			expContainerSettings.shifting = true;
+			expandedContainerSettings.shifting = true;
 
 			// grab the next appearing placeholder so we can use it for replacing
 			$target = $( data.expandedContainer ).find( 'span.placeholder' ).first();
@@ -184,9 +181,9 @@
 							// change the tab's contents after the page load *gasp* (T71729). This
 							// doesn't prevent a tab from collapsing back and forth once, but at
 							// least it won't continue to do that forever.
-							data.expandedWidth = $moving.width();
+							data.expandedWidth = $moving.width() || 0;
 							$moving.data( 'collapsibleTabsSettings', data );
-							expContainerSettings.shifting = false;
+							expandedContainerSettings.shifting = false;
 							$.collapsibleTabs.handleResize();
 						} );
 					} )
@@ -215,10 +212,12 @@
 				leftTab = document.getElementById( 'right-navigation' );
 				rightTab = document.getElementById( 'left-navigation' );
 			}
-
-			leftEnd = leftTab.getBoundingClientRect().right;
-			rightStart = rightTab.getBoundingClientRect().left;
-			return rightStart - leftEnd;
+			if ( leftTab && rightTab ) {
+				leftEnd = leftTab.getBoundingClientRect().right;
+				rightStart = rightTab.getBoundingClientRect().left;
+				return rightStart - leftEnd;
+			}
+			return 0;
 		}
 	};
 }() );
diff --git a/resources/skins.vector.js/vector.js b/resources/skins.vector.js/vector.js
index 6a8fde5..f1d36ab 100644
--- a/resources/skins.vector.js/vector.js
+++ b/resources/skins.vector.js/vector.js
@@ -14,7 +14,7 @@ $( function () {
 			// must not return 0 if hidden, but rather virtually render it
 			// and compute its width, then hide it again. jQuery width() does
 			// all that for us.
-			var width = $cactions.width();
+			var width = $cactions.width() || 0;
 			initialCactionsWidth = function () {
 				return width;
 			};
@@ -98,8 +98,8 @@ $( function () {
 				// 3. and, the left-navigation and right-navigation are overlapping
 				//    each other, e.g. when making the window very narrow, or if a gadget
 				//    added a lot of tabs.
-				$tabContainer.children( 'li.collapsible' ).each( function ( index, element ) {
-					collapsibleWidth += $( element ).width();
+				$tabContainer.children( 'li.collapsible' ).each( function ( _index, element ) {
+					collapsibleWidth += $( element ).width() || 0;
 					if ( collapsibleWidth > initialCactionsWidth() ) {
 						// We've found one or more collapsible links that are wider
 						// than the "More" menu would be if it were made visible,
@@ -108,6 +108,7 @@ $( function () {
 						// Stop this possibly expensive loop the moment the condition is met once.
 						return false;
 					}
+					return;
 				} );
 				return doCollapse;
 			}
diff --git a/stories/Portal.stories.data.js b/stories/Portal.stories.data.js
index 9cc939e..9ac863b 100644
--- a/stories/Portal.stories.data.js
+++ b/stories/Portal.stories.data.js
@@ -4,6 +4,22 @@ import '../resources/skins.vector.styles/Portal.less';
 import '../.storybook/common.less';
 import { placeholder, htmluserlangattributes } from './utils';
 
+/**
+ * @typedef {Object} PortletContext
+ * @prop {string} portal-id
+ * @prop {string} html-tooltip
+ * @prop {string} msg-label-id
+ * @prop {string} [html-userlangattributes]
+ * @prop {string} msg-label
+ * @prop {string} html-portal-content
+ * @prop {string} [html-after-portal]
+ * @prop {string} [html-hook-vector-after-toolbox] Deprecated and used by the toolbox portal.
+ */
+
+/**
+ * @param {PortletContext} data
+ * @return {HTMLElement}
+ */
 export const wrapPortlet = ( data ) => {
 	const node = document.createElement( 'div' );
 	node.setAttribute( 'id', 'mw-panel' );
@@ -11,6 +27,10 @@ export const wrapPortlet = ( data ) => {
 	return node;
 };
 
+/**
+ * @param {string} html
+ * @return {string}
+ */
 const portletAfter = ( html ) => {
 	return `<div class="after-portlet after-portlet-tb">${html}</div>`;
 };
@@ -33,6 +53,7 @@ export const PORTALS = {
 	},
 	navigation: {
 		'portal-id': 'p-navigation',
+		'html-tooltip': 'A message tooltip-p-navigation must exist for this to appear',
 		'msg-label': 'Navigation',
 		'msg-label-id': 'p-navigation-label',
 		'html-userlangattributes': htmluserlangattributes,
@@ -71,7 +92,7 @@ ${placeholder( `<p>Further hook output possible (lang)</p>`, 60 )}`
 	},
 	otherProjects: {
 		'portal-id': 'p-wikibase-otherprojects',
-		'html-tooltip': 'A message tooltip-p-lang must exist for this to appear',
+		'html-tooltip': 'A message tooltip-p-wikibase-otherprojects must exist for this to appear',
 		'msg-label': 'In other projects',
 		'msg-label-id': 'p-wikibase-otherprojects-label',
 		'html-userlangattributes': htmluserlangattributes,
diff --git a/stories/rawLoader.d.ts b/stories/rawLoader.d.ts
new file mode 100644
index 0000000..00e8039
--- /dev/null
+++ b/stories/rawLoader.d.ts
@@ -0,0 +1,4 @@
+declare module "!!raw-loader!*" {
+	const src: string;
+	export default src;
+}
diff --git a/stories/utils.js b/stories/utils.js
index 8118728..ffe172f 100644
--- a/stories/utils.js
+++ b/stories/utils.js
@@ -1,3 +1,8 @@
+/**
+ * @param {string} msg
+ * @param {number} [height=200]
+ * @return {string}
+ */
 const placeholder = ( msg, height ) => {
 	return `<div style="width: 100%; height: ${height || 200}px; margin-bottom: 2px;
 		font-size: 12px; padding: 8px; box-sizing: border-box;
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..cba57ae
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,19 @@
+{
+	"exclude": ["docs", "vendor"],
+	"compilerOptions": {
+		"resolveJsonModule": true,
+		"esModuleInterop": true,
+		"strict": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"noImplicitReturns": true,
+		"newLine": "lf",
+		"forceConsistentCasingInFileNames": true,
+		"pretty": true,
+		"target": "es5",
+		"lib": ["dom"],
+		"allowJs": true,
+		"checkJs": true,
+		"noEmit": true
+	}
+}