TypeError: Cannot read properties of undefined (reading ‘cancelToken‘)

problem ： In the packaging axios When , An error is suddenly reported during the test TypeError: Cannot read properties of undefined (reading ‘cancelToken’)

describe ： lately , In order to solve the old axios Some problems in encapsulation , The decision is right axios Change and optimize the package of , When you enter the self-test after changing the request interception , All of a sudden, an error was reported TypeError: Cannot read properties of undefined (reading ‘cancelToken’), It's strange , Because it hasn't arrived yet cancelToken This part

answer ： The reason is simple , After the request interceptor is written , No will config return , Then you will report this error , Really careless

//  Wrong report 
this.axios.interceptors.request.use(
	(config: AxiosRequestConfig) => {
    
		requestInterceptors(config);
	},
	(error) => {
    
		Promise.reject(error);
	}
);

The request interceptor here must be changed to have a return value

this.axios.interceptors.request.use(
	(config: AxiosRequestConfig) => {
    
		return requestInterceptors(config);
	},
	(error) => {
    
		Promise.reject(error);
	}
);

If you change it to this type, you will no longer report errors