本文整理汇总了TypeScript中@jupyterlab/apputils.StateDB.fetch方法的典型用法代码示例。如果您正苦于以下问题：TypeScript StateDB.fetch方法的具体用法？TypeScript StateDB.fetch怎么用？TypeScript StateDB.fetch使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类@jupyterlab/apputils.StateDB的用法示例。
在下文中一共展示了StateDB.fetch方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的TypeScript代码示例。
示例1: it
it('should resolve a nonexistent key fetch with null', done => {
let { localStorage } = window;
localStorage.clear();
let db = new StateDB({ namespace: 'test-namespace' });
let key = 'foo:bar';
expect(localStorage.length).to.be(0);
db.fetch(key)
.then(fetched => { expect(fetched).to.be(null); })
.then(done)
.catch(done);
});示例2: StateDB
activate: (app: JupyterLab) => {
let state = new StateDB({ namespace: app.info.namespace });
let version = app.info.version;
let key = 'statedb:version';
let fetch = state.fetch(key);
let save = () => state.save(key, { version });
let reset = () => state.clear().then(save);
let check = (value: JSONObject) => {
let old = value && value['version'];
if (!old || old !== version) {
console.log(`Upgraded: ${old || 'unknown'} to ${version}; Resetting DB.`);
return reset();
}
};
app.commands.addCommand(CommandIDs.clearStateDB, {
label: 'Clear Application Restore State',
execute: () => state.clear()
});
return fetch.then(check, reset).then(() => state);
}