Large File handling - Cypress.fixture(fileName, fileEncoding) - cannot create a string longer than

[LoganWlv]

Current behavior

Cypress.fixture(fileName, fileEncoding) breaks when loading a 500MB csv file.

Desired behavior

Be able to load a ~500MB fixture.

Test code to reproduce

.js

import { Given, Then } from 'cypress-cucumber-preprocessor/steps'

Given('Load file {string} and {string}', (fileName, fileEncoding) => {
  cy.fixture(fileName, fileEncoding).then(v => console.log(v))
})

Then('File should be loaded', loadedFile => {
  return true;
})

.feature

Feature: Test

  Scenario Outline: Load large file

    Given Load file '<file>' and '<encoding>'
    Then File should be loaded
    Examples:
      | file              | encoding |
      | tuto_DB_italy.csv | utf8     |

use any .csv file that size is at least 500MB

Versions

dependencies:

"@testing-library/cypress": "^7.0.6",
"clipboardy": "^2.3.0",
"cypress": "^7.4.0",
"cypress-cucumber-preprocessor": "^4.1.0",
"cypress-file-upload": "^5.0.7"

OS: MacOs Catalina 10.15.7
Browser: Chrome 91

[LoganWlv]

It seems to happen in the server side.

Extra logs:

Here's what I get in the web socket:

[BlueWinds]

In Cypress 9.0.0, we added the null encoding, which helps significantly when dealing with large fixtures and files. This transfers the data as an ArrayBuffer rather than a base64 encoded string.
https://docs.cypress.io/api/commands/fixture#Arguments

Cypress still tends to encounter issues with files in the gigabyte range, but 500mb should now be doable. Going to close this issue as resolved, feel free to let us know if the above still isn't working for you.

It's possible you may still run into #7365, but hopefully this is at least a step forward!