Put all the relevant privacy helpers into their own module

module/utils/privacy.mjs

@@ -1,3 +1,22 @@
+export const PrivacyMode = Object.freeze({
+	GM: `gm`,
+	PRIVATE: `private`,
+	SELF: `self`,
+	PUBLIC: `public`,
+});
+
+export function determinePrivacyFromRollMode(rollMode) {
+	switch (rollMode) {
+		case CONST.DICE_ROLL_MODES.BLIND:
+			return PrivacyMode.GM;
+		case CONST.DICE_ROLL_MODES.PRIVATE:
+			return PrivacyMode.PRIVATE;
+		case CONST.DICE_ROLL_MODES.SELF:
+			return PrivacyMode.SELF;
+	}
+	return PrivacyMode.PUBLIC;
+};
+
 /**
  * Filters an array of database rows based on if the current user would
  * be able to see them based on the privacy level.