What is the environment variable load order for wrangler.dev & env.vars?

If I have env vars defined in
wrangler.toml
and env.vars which is picked and which is overridden?

For example this is NextJS' environment variale load order:
Environment variables are looked up in the following places, in order, stopping once the variable is found.
  1. process.env
  2. .env.$(NODE_ENV).local
  3. .env.local (Not checked when NODE_ENV is test.)
  4. .env.$(NODE_ENV)
  5. .env
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