Add initial Typescript Files (#15596)

shared/constants/permissions.ts

@@ -1,5 +1,5 @@
 export const CaveatTypes = Object.freeze({
-  restrictReturnedAccounts: 'restrictReturnedAccounts',
+  restrictReturnedAccounts: 'restrictReturnedAccounts' as const,
 });
 
 export const RestrictedMethods = Object.freeze({
@@ -11,18 +11,18 @@ export const RestrictedMethods = Object.freeze({
   'snap_getBip44Entropy_*': 'snap_getBip44Entropy_*',
   'wallet_snap_*': 'wallet_snap_*',
   ///: END:ONLY_INCLUDE_IN
-});
+} as const);
 
 ///: BEGIN:ONLY_INCLUDE_IN(flask)
 export const PermissionNamespaces = Object.freeze({
   snap_getBip44Entropy_: 'snap_getBip44Entropy_*',
   wallet_snap_: 'wallet_snap_*',
-});
+} as const);
 
 export const EndowmentPermissions = Object.freeze({
   'endowment:network-access': 'endowment:network-access',
   'endowment:long-running': 'endowment:long-running',
-});
+} as const);
 
 // Methods / permissions in external packages that we are temporarily excluding.
 export const ExcludedSnapPermissions = new Set([]);

test/setup.js

@@ -1,4 +1,5 @@
 require('@babel/register');
+require('ts-node/register');
 
 require('./helpers/setup-helper');