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Gleam essentials that prevent the highest-frequency compile errors when writing Gleam from Elixir/other-language intuition — Result vs Option, case guards, custom-type matching, type/function syntax, and the CLI. Use before writing or editing any .gleam file, or when gleam check/format fails.

Best practices for writing Gleam tests with gleeunit. Use when writing or reviewing Gleam test files, fixing silently-passing tests, or choosing assertion patterns.