r-package-error-handling

Teaches how to signal, contextualise, and test errors, warnings, and messages in R packages using rlang and cli. Covers cli_abort, cli_warn, and cli_inform messages built from bullets, inline markup, and pluralization; caller_env and caller_arg so errors name the user-facing function and argument; reusable input checkers; catching and rethrowing with try_fetch, including parent chaining, replacing low-level errors, loop context, and call repair; customising bullet symbols and colours; and testthat snapshot tests. Use when writing, refactoring, or reviewing package code that throws, validates, catches, or tests conditions. Not for interactive session debugging, logging pipelines, or non-R projects.

Version

v1.0.0

Size

17 KB

Updated

2026-10-10

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