示例
流量重复
问题
我正在尝试访问我认为应该始终存在的对象的字段。
如何解决以错误?
片段
problem = (arg: {refKey: string} = {}) => {
const {refKey = 'ref', ...rest} = arg;
return {
[refKey]:arg[refKey],
...rest
};
};
错误:
19: [refKey]:arg[refKey],
^ Cannot get `arg[refKey]` because property `ref` is missing in object type [1].
References:
16: problem = (arg: {refKey: string} = {}) => {
^ [1]
发生这种情况是因为您在声明值时设置了该值。
如果要设置默认值,可以在默认参数中进行设置,如下所示:
problem = (arg: {refKey: string} = {refKey: 'ref'}) => {
const {refKey, ...rest} = arg;
return {
[refKey]:arg[refKey],
...rest
};
};
编辑
好吧,我想我误解了这个问题,现在已经理解了(!
如果默认属性将命名为'ref'
,则可以执行以下操作:
problem = (arg: {refKey: string, ref: any} = {}) => {
const {refKey = 'ref', ...rest} = arg;
return {
[refKey]:arg[refKey],
...rest
};
};