Improved message type

src/messages.ts

@@ -1,8 +1,4 @@
-interface MessageGroup {
-	[key: string]: string;
-}
-
-const errors: MessageGroup = {
+const errors = {
 	CP_INIT_ERROR: "Something went really bad in the %s initialization! Look at the log below this message. It should contain all the infos about the problem: \n%s",
 	CP_NO_OPTS: "Cannot initialize the pass or abstract model creation: no options were passed.",
 	CP_NO_CERTS: "Cannot initialize the pass creation: no valid certificates were passed.",
@@ -19,7 +15,7 @@ const errors: MessageGroup = {
 	NO_PASS_TYPE: "Cannot proceed with pass creation. Model definition (pass.json) has no valid type in it.\nRefer to https://apple.co/2wzyL5J to choose a valid pass type."
 };
 
-const debugMessages: MessageGroup = {
+const debugMessages = {
 	TRSTYPE_NOT_VALID: "Transit type changing rejected as not compliant with Apple Specifications. Transit type would become \"%s\" but should be in [PKTransitTypeAir, PKTransitTypeBoat, PKTransitTypeBus, PKTransitTypeGeneric, PKTransitTypeTrain]",
 	BRC_NOT_SUPPORTED: "Format not found among barcodes. Cannot set backward compatibility.",
 	BRC_FORMATTYPE_UNMATCH: "Format must be a string or null. Cannot set backward compatibility.",
@@ -32,13 +28,15 @@ const debugMessages: MessageGroup = {
 	PRS_REMOVED: "Personalization has been removed as it requires an NFC-enabled pass to work."
 };
 
+type AllMessages = keyof (typeof debugMessages & typeof errors);
+
 /**
  * Creates a message with replaced values
  * @param {string} messageName
  * @param  {any[]} values
  */
 
-export default function format(messageName: string, ...values: any[]) {
+export default function format(messageName: AllMessages, ...values: any[]) {
 	// reversing because it is better popping than shifting.
 	let replaceValues = values.reverse();
 	return resolveMessageName(messageName).replace(/%s/g, () => {
@@ -52,7 +50,7 @@ export default function format(messageName: string, ...values: any[]) {
  * @param {string} name
  */
 
-function resolveMessageName(name: string): string {
+function resolveMessageName(name: AllMessages): string {
 	if (!errors[name] && !debugMessages[name]) {
 		return `<ErrorName "${name}" is not linked to any error messages>`;
 	}