src/vs/editor/browser/config/migrateOptions.ts/registerSimpleEditorSettingMigration
function registerSimpleEditorSettingMigration(key: string, values: [any, any][]): void {
	registerEditorSettingMigration(key, (value, read, write) => {
		if (typeof value !== 'undefined') {
			for (const [oldValue, newValue] of values) {
				if (value === oldValue) {
					write(key, newValue);
					return;
				}
			}
		}
	});
}