Web developer specializing in React, Vue, and front end development.
To fix Vue js error: Component template should contain exactly one root element, we should wrap our elements with one root element in our template.
For instance, we write
<div>
<div class="form-group">...</div>
<div class="col-md-6">...</div>
</div>
to wrap a div around the other divs to clear the error.
To fix ‘TypeError: is not a function’ error in Node.js, we should make sure the variable is a function.
For instance, we write
module.exports = functionName
to export the functionName function in function.js.
Then we require it with
const functionName = require('./function')
Now we can call functionName in our code.
To check if token expired using this JWT library in Node.js, we get the expiration timestamp and compare it to the current date and time.
For instance, we write
const isTokenExpired = (token) =>
Date.now() >= JSON.parse(atob(token.split(".")[1])).exp * 1000;
to get the token’s expiration timestamp in milliseconds with
JSON.parse(atob(token.split(".")[1])).exp * 1000
Then we compare it to the current timestamp returned by Date.now.
If the current timestamp is bigger than the token’s timestamp, then the token expired.
To change working directory for npm scripts, we run cd before running our script.
For instance, we write
cd dir && command -args
in our npm script to change the directory to dir with cd before running command with the -args flags.
To stub process.env in Node.js, we set the values in our test.
For instance, we write
it("does something interesting", () => {
process.env.NODE_ENV = "test";
// ...
});
afterEach(() => {
delete process.env.NODE_ENV;
});
to set the process.env.NODE_ENV to 'test' in our test.
And we delete the property in the afterEach callback so it’s removed after each test.