refactor: Make all stores optional

This reduces boilerplate and helps with config file robustness: if a
field is missing from the config file, it will be replaced with its
default value.

2 files changed, 5 insertions, 13 deletions

diff --git a/packages/shared/src/stores/Config.ts b/packages/shared/src/stores/Config.ts
index 1a9f924..432945c 100644
--- a/packages/shared/src/stores/Config.ts
+++ b/packages/shared/src/stores/Config.ts
@@ -27,14 +27,10 @@ import {
 
 import { themeSource } from '../schemas';
 
-export const config = types.model("Config", {
-  themeSource: types.enumeration(themeSource.options),
+export const config = types.model('Config', {
+  themeSource: types.optional(types.enumeration(themeSource.options), 'system'),
 });
 
-export const defaultConfig: ConfigSnapshotIn = {
-  themeSource: 'system',
-};
-
 export interface Config extends Instance<typeof config> {}
 
 export interface ConfigSnapshotIn extends SnapshotIn<typeof config> {}
diff --git a/packages/shared/src/stores/SharedStore.ts b/packages/shared/src/stores/SharedStore.ts
index 9f0afb1..cfff6d5 100644
--- a/packages/shared/src/stores/SharedStore.ts
+++ b/packages/shared/src/stores/SharedStore.ts
@@ -26,17 +26,13 @@ import {
   SnapshotOut,
 } from 'mobx-state-tree';
 
-import { config, defaultConfig } from './Config';
+import { config } from './Config';
 
-export const sharedStore = types.model("SharedStore", {
-  config,
+export const sharedStore = types.model('SharedStore', {
+  config: types.optional(config, {}),
   shouldUseDarkColors: true,
 });
 
-export const emptySharedStore: SharedStoreSnapshotIn = {
-  config: defaultConfig,
-};
-
 export interface SharedStore extends Instance<typeof sharedStore> {}
 
 export interface SharedStoreSnapshotIn extends SnapshotIn<typeof sharedStore> {}