If you are interesting in contributing to the flatbuffers project, please take a second to read this document. Each language has it's own set of rules, that are defined in their respective formatter/linter documents.
C++ uses clang-format as it's formatter. Run the following script sh scripts/clang-format-git.sh, and it should style the C++ code according to google style guide.
Swift uses swiftformat as it's formatter. Take a look at how to install here. Run the following command swiftformat --config swift.swiftformat . in the root directory of the project
Typescript uses eslint as it's linter. Take a look at how to install here. Run the following command eslint ts/** --ext .ts in the root directory of the project