Cypress: Getting The task 'gmail:get-messages' returned undefined. in Cypress 10 but its working on older version of cypress - plugins

Question

I am using cypress gmail-tester. I have updated cypress to 10 or above version and gmail-tester return the below error.
cy.task('gmail:get-messages') failed with the following error:
The task 'gmail:get-messages' returned undefined. You must return a value, null, or a promise that resolves to a value or null to indicate that the task was handled.
The task handler was:
async args => {
const messages = await gmail_tester.get_messages(
path.resolve(__dirname, "credentials.json"),
path.resolve(__dirname, "token.json"),
args.options
);
console.log(messages);
return messages;
}
Fix this in your setupNodeEvents method here:
/home/krupal/Desktop/Cypress Automation/RebelBase/cypress.config.js
In cypress's older version it's working fine.
Here is my plugin/index.js file
/// <reference types="Cypress" />
const debug = require("debug");
const path = require("path");
const gmail_tester = require("gmail-tester");
const cucumber = require('cypress-cucumber-preprocessor').default;
module.exports = (on, config) => {
on('file:preprocessor', cucumber());
on("task", {
"gmail:get-messages": async args => {
const messages = await gmail_tester.get_messages(
path.resolve(__dirname, "credentials.json"),
path.resolve(__dirname, "token.json"),
args.options
);
console.log(messages);
return messages;
}
});
on("task", { "setUserId": (val) => { return (userId = val); } });
on("task", { "getUserId": () => { return userId; } });
};
And here is my cypress.config.js file
const { defineConfig } = require('cypress')
module.exports = defineConfig({
e2e: {
// We've imported your old cypress plugins here.
// You may want to clean this up later by importing these.
setupNodeEvents(on, config) {
return require('./cypress/plugins/index.js')(on, config)
},
baseUrl: 'https://app.dev.rebelbase.co',
experimentalSessionAndOrigin: true,
specPattern: 'cypress/integration/**/*.feature',
},
})
And in my test I have used like...
cy.task("gmail:get-messages", {
options: {
from: "noreply#rebelbase.co",
subject: "Join CypressTestProject01 team on RebelBase",
include_body: true,
// before: new Date(2021, 9, 24, 12, 31, 13), // Before September 24rd, 2019 12:31:13
// after: new Date(2021, 7, 23) // After August 23, 2019
}
}).then(emails => {
assert.isAtLeast(
emails.length,
1,
"Expected to find at least one email, but none were found!"
);
const body = emails[0].body.html;
console.log(body)
cy.log(body);
assert.isTrue(
body.indexOf(
"/auth/sign-up?type=project_invitation&token="
) >= 0,
"Found link!"
);
window.token = extractData(body, startStr, endStr);
cy.visit(
`auth/sign-up?type=project_invitation&token=${token}&email=${randomEmail8}`
);
})