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According to the patch realese 10.0.0:
Using a cypress.json configuration file is no longer supported. Replace this configuration file with a cypress.config.js, cypress.config.ts, cypress.config.cjs or cypress.config.mjs file. This change provides better flexibility and extensibility of configuration. An error will be thrown if both a cypress.json file and cypress.config.{cjs,js,mjs,ts} file are found. Addressed in #18221, #18300, #20554, and #20643.