diff --git a/tsconfig.json b/tsconfig.json
index 33ae8a5a..021df9c3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -21,6 +21,7 @@
     /* Emit */
     "sourceMap": true, /* Create source map files for emitted JavaScript files. */
     "outDir": "./dist", /* Specify an output folder for all emitted files. */
+    "typeRoots": ["./types"],
 
     /* Interop Constraints */
     "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
diff --git a/types/ical.js.d.ts b/types/ical.js.d.ts
new file mode 100644
index 00000000..282c587a
--- /dev/null
+++ b/types/ical.js.d.ts
@@ -0,0 +1,250 @@
+declare module 'ical.js' {
+	function parse(input: string): unknown[]
+
+	// eslint-disable-next-line @typescript-eslint/no-extraneous-class
+	export class helpers {
+		public static updateTimezones(vcal: Component): Component
+	}
+
+	class Component {
+		public static fromString(str: string): Component
+
+		public name: string
+
+		constructor(jCal: unknown[] | string, parent?: Component)
+
+		public toJSON(): unknown[]
+
+		public getFirstSubcomponent(name?: string): Component | null
+
+		public getAllSubcomponents(name?: string): Component[]
+
+		public getFirstPropertyValue<T = unknown>(name?: string): T
+
+		public getFirstProperty(name?: string): Property
+
+		public getAllProperties(name?: string): Property[]
+
+		public addProperty(property: Property): Property
+
+		public addPropertyWithValue(
+			name: string,
+			value: string | number | object,
+		): Property
+
+		public updatePropertyWithValue(
+			name: string,
+			value: string | number | object,
+		): Property
+
+		public removeAllProperties(name?: string): boolean
+
+		public addSubcomponent(component: Component): Component
+	}
+
+	export class Event {
+		public uid: string
+		public summary: string
+		public startDate: Time
+		public endDate: Time
+		public description: string
+		public location: string
+		public attendees: Property[]
+
+		public component: Component
+
+		public constructor(
+			component?: Component | null,
+			options?: {
+				strictExceptions: boolean
+				exceptions: (Component | Event)[]
+			},
+		)
+
+		public isRecurring(): boolean
+
+		public iterator(startTime?: Time): RecurExpansion
+	}
+
+	export class Property {
+		public name: string
+		public type: string
+
+		constructor(jCal: unknown[] | string, parent?: Component)
+
+		public getFirstValue<T = unknown>(): T
+
+		public getValues<T = unknown>(): T[]
+
+		public setParameter(name: string, value: string | string[]): void
+
+		public setValue(value: string | object): void
+
+		public setValues(values: (string | object)[]): void
+
+		public toJSON(): unknown
+	}
+
+	interface TimeJsonData {
+		year?: number
+		month?: number
+		day?: number
+		hour?: number
+		minute?: number
+		second?: number
+		isDate?: boolean
+	}
+
+	export class Time {
+		public static fromString(str: string): Time
+
+		public static fromJSDate(aDate: Date | null, useUTC: boolean): Time
+
+		public static fromData(aData: TimeJsonData): Time
+
+		public static now(): Time
+
+		public isDate: boolean
+		public timezone: string
+		public zone: Timezone
+
+		public year: number
+		public month: number
+		public day: number
+		public hour: number
+		public minute: number
+		public second: number
+
+		constructor(data?: TimeJsonData)
+
+		public compare(aOther: Time): number
+
+		public clone(): Time
+
+		public convertToZone(zone: Timezone): Time
+
+		public adjust(
+			aExtraDays: number,
+			aExtraHours: number,
+			aExtraMinutes: number,
+			aExtraSeconds: number,
+			aTimeOpt?: Time,
+		): void
+
+		public addDuration(aDuration: Duration): void
+
+		public subtractDateTz(aDate: Time): Duration
+
+		public toUnixTime(): number
+
+		public toJSDate(): Date
+
+		public toJSON(): TimeJsonData
+
+		public toString(): string
+	}
+
+	export class Duration {
+		public days: number
+	}
+
+	export class RecurExpansion {
+		public complete: boolean
+
+		public next(): Time
+	}
+
+	export class Timezone {
+		public static utcTimezone: Timezone
+		public static localTimezone: Timezone
+
+		public static convert_time(
+			tt: Time,
+			fromZone: Timezone,
+			toZone: Timezone,
+		): Time
+
+		public tzid: string
+		public component: Component
+
+		constructor(
+			data:
+				| Component
+				| {
+						component: string | Component
+						tzId?: string
+						location?: string
+						tzNames?: string
+						latitude?: number
+						longitude?: number
+				  },
+		)
+	}
+
+	// eslint-disable-next-line @typescript-eslint/no-extraneous-class
+	export class TimezoneService {
+		public static get(tzid: string): Timezone | null
+
+		public static has(tzid: string): boolean
+
+		public static register(tzid: string, zone: Timezone | Component)
+
+		public static remove(tzid: string): Timezone | null
+	}
+
+	export type FrequencyValues =
+		| 'YEARLY'
+		| 'MONTHLY'
+		| 'WEEKLY'
+		| 'DAILY'
+		| 'HOURLY'
+		| 'MINUTELY'
+		| 'SECONDLY'
+
+	export enum WeekDay {
+		SU = 1,
+		MO,
+		TU,
+		WE,
+		TH,
+		FR,
+		SA,
+	}
+
+	export class RecurData {
+		public freq?: FrequencyValues
+		public interval?: number
+		public wkst?: WeekDay
+		public until?: Time
+		public count?: number
+		public bysecond?: number[] | number
+		public byminute?: number[] | number
+		public byhour?: number[] | number
+		public byday?: string[] | string
+		public bymonthday?: number[] | number
+		public byyearday?: number[] | number
+		public byweekno?: number[] | number
+		public bymonth?: number[] | number
+		public bysetpos?: number[] | number
+	}
+
+	export class RecurIterator {
+		public next(): Time
+	}
+
+	export class Recur {
+		constructor(data?: RecurData)
+
+		public until: Time | null
+		public freq: FrequencyValues
+		public count: number | null
+
+		public clone(): Recur
+
+		public toJSON(): Omit<RecurData, 'until'> & {until?: string}
+
+		public iterator(startTime?: Time): RecurIterator
+
+		public isByCount(): boolean
+	}
+}