In 0b1b54c67a5b5f53841c26706e298b74999cb421 we removed @cypress/webpack-preprocessor in favour of native Typescript support introduced in Cypress v4.4.0.
This should also mean that cypress/support/index.ts and cypress/plugins/index.ts are found automatically by Cypress, without needing to configure pluginsFile or supportFile in cypress.json to point to these files.
Unfortunately this isn't yet working as expected, and a workaround is still needed. Hopefully this will be fixed in a later Cypress release.
In 0b1b54c67a5b5f53841c26706e298b74999cb421 we removed
@cypress/webpack-preprocessorin favour of native Typescript support introduced in Cypress v4.4.0.This should also mean that
cypress/support/index.tsandcypress/plugins/index.tsare found automatically by Cypress, without needing to configurepluginsFileorsupportFileincypress.jsonto point to these files.Unfortunately this isn't yet working as expected, and a workaround is still needed. Hopefully this will be fixed in a later Cypress release.
https://github.com/cypress-io/cypress/issues/7459