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Order of Terraform version definition precedence

Order Method
1 $HOME/.tfswitch.toml (version parameter)
2 .tfswitch.toml (version parameter)
3 .tfswitchrc (version as a string)
4 .terraform-version (version as a string)
5 Terraform root module (required_version constraint)
6 terragrunt.hcl (terraform_version_constraint parameter)
7 Environment variable (TF_VERSION)

With 1 being the lowest precedence and 7 — the highest
(If you disagree with this order of precedence, please open an issue)