Fix validation being incorrectly run before schema change (#194)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

source/index.ts

@@ -137,6 +137,16 @@ export default class Conf<T extends Record<string, any> = Record<string, unknown
 
 		const fileStore = this.store;
 		const store = Object.assign(createPlainObject(), options.defaults, fileStore);
+
+		if (options.migrations) {
+			if (!options.projectVersion) {
+				throw new Error('Please specify the `projectVersion` option.');
+			}
+
+			this._migrate(options.migrations, options.projectVersion, options.beforeEachMigration);
+		}
+
+		// We defer validation until after migrations are applied so that the store can be updated to the current schema.
 		this._validate(store);
 
 		try {
@@ -148,14 +158,6 @@ export default class Conf<T extends Record<string, any> = Record<string, unknown
 		if (options.watch) {
 			this._watch();
 		}
-
-		if (options.migrations) {
-			if (!options.projectVersion) {
-				throw new Error('Please specify the `projectVersion` option.');
-			}
-
-			this._migrate(options.migrations, options.projectVersion, options.beforeEachMigration);
-		}
 	}
 
 	/**