diff --git a/src/schemas/Field.ts b/src/schemas/Field.ts
index 1c837c5..f9852a3 100644
--- a/src/schemas/Field.ts
+++ b/src/schemas/Field.ts
@@ -1,6 +1,31 @@
 import Joi from "joi";
 import { Semantics } from "./Semantics";
 
+export type PKDataDetectorType =
+	| "PKDataDetectorTypePhoneNumber"
+	| "PKDataDetectorTypeLink"
+	| "PKDataDetectorTypeAddress"
+	| "PKDataDetectorTypeCalendarEvent";
+
+export type PKTextAlignmentType =
+	| "PKTextAlignmentLeft"
+	| "PKTextAlignmentCenter"
+	| "PKTextAlignmentRight"
+	| "PKTextAlignmentNatural";
+
+export type PKDateStyleType =
+	| "PKDateStyleNone"
+	| "PKDateStyleShort"
+	| "PKDateStyleMedium"
+	| "PKDateStyleLong"
+	| "PKDateStyleFull";
+
+export type PKNumberStyleType =
+	| "PKNumberStyleDecimal"
+	| "PKNumberStylePercent"
+	| "PKNumberStyleScientific"
+	| "PKNumberStyleSpellOut";
+
 /**
  * @see https://developer.apple.com/documentation/walletpasses/passfieldcontent
  */
@@ -8,18 +33,18 @@ import { Semantics } from "./Semantics";
 export interface Field {
 	attributedValue?: string | number | Date;
 	changeMessage?: string;
-	dataDetectorTypes?: string[];
+	dataDetectorTypes?: PKDataDetectorType[];
 	label?: string;
-	textAlignment?: string;
+	textAlignment?: PKTextAlignmentType;
 	key: string;
 	value: string | number | Date;
 	semantics?: Semantics;
-	dateStyle?: string;
+	dateStyle?: PKDateStyleType;
 	ignoresTimeZone?: boolean;
 	isRelative?: boolean;
 	timeStyle?: string;
 	currencyCode?: string;
-	numberStyle?: string;
+	numberStyle?: PKNumberStyleType;
 }
 
 export interface FieldWithRow extends Field {