Is it possible to set environment variables in the before:browser:launch API?

[Benyon]

The basic approach here is to make an API call to our gitlab unleash proxy to get the feature toggles in the environment, and then in the test I can use Cypress.env('TOGGLES') to get that information.

Is there a better way to achieve this?

Here's the config I have.

/* eslint-disable no-console */
import axios from 'axios';
import { defineConfig } from 'cypress';
import plugins from '../src/plugins';

export default defineConfig({
  reporter: 'cypress-multi-reporters',
  reporterOptions: {
    configFile: 'config/reporter-config.json',
  },
  env: {
    PRODUCTS_PER_PAGE: 36,
    TEST_SUITE: 'regression',
  },
  e2e: {
    baseUrl: 'https://REDACTED.co.uk',
    projectId: 'REDACTED',
    viewportWidth: 1920,
    viewportHeight: 1080,
    retries: {
      runMode: 1,
      openMode: 0,
    },
    video: true,
    chromeWebSecurity: false,
    watchForFileChanges: false,
    fileServerFolder: '.',
    fixturesFolder: './src/fixtures',
    specPattern: './src/e2e/regression/**/*.{desktop,common}.cy.{js,jsx,ts,tsx}',
    supportFile: '../**/support/e2e.ts',
    videosFolder: '../../dist/cypress/apps/base-e2e/videos',
    screenshotsFolder: '../../dist/cypress/apps/base-e2e/screenshots',
    numTestsKeptInMemory: 1,
    defaultCommandTimeout: 18000,
    execTimeout: 30000,
    taskTimeout: 30000,
    pageLoadTimeout: 45000,
    requestTimeout: 12000,
    responseTimeout: 20000,
    setupNodeEvents(on) {
      console.log('hello')
      on('task', plugins);
      on('before:browser:launch', (browser: Cypress.Browser, browserLaunchOptions: Cypress.BrowserLaunchOptions) => {
        const url = browserLaunchOptions.preferences.url.replace('/__/', '') || '';
        const isQa = url.startsWith('https://qa.');
        const proxyUrl = isQa ? `${url}/proxy` : formatFeatureDevUrlToProxy(url);
        // No credentials.
        if (!url) throw new Error('Could not get environment base url.');
        // Make request to unleash proxy.
        axios.request({
          method: 'get',
          url: proxyUrl,
          headers: {
            Authorization: 'REDACTED',
          },
          validateStatus: () => true,
        }).then(res => {
          process.env.TOGGLES = res.data
        })
      })
    },
  },
});