deprecate_soft: Deprecate functions and arguments

Description

These functions provide three levels of verbosity for deprecated functions. Learn how to use them in vignette("communicate").

deprecate_soft() warns only if the deprecated function is called directly, i.e. a user is calling a function they wrote in the global environment or a developer is calling it in their package. It does not warn when called indirectly, i.e. the deprecation comes from code that you don't control.
deprecate_warn() warns unconditionally.
deprecate_stop() fails unconditionally.

Warnings are only issued once every 8 hours to avoid overwhelming the user. Control with options(lifecycle_verbosity).

Usage

deprecate_soft(
  when,
  what,
  with = NULL,
  details = NULL,
  id = NULL,
  env = caller_env(),
  user_env = caller_env(2)
)
deprecate_warn(
  when,
  what,
  with = NULL,
  details = NULL,
  id = NULL,
  always = FALSE,
  env = caller_env(),
  user_env = caller_env(2)
)
deprecate_stop(when, what, with = NULL, details = NULL, env = caller_env())

Value

NULL, invisibly.

Arguments

when

A string giving the version when the behaviour was deprecated.

what

A string describing what is deprecated:

Deprecate a whole function with "foo()".
Deprecate an argument with "foo(arg)".
Partially deprecate an argument with "foo(arg = 'must be a scalar integer')".
Deprecate anything else with a custom message by wrapping it in I().

You can optionally supply the namespace: "ns::foo()", but this is usually not needed as it will be inferred from the caller environment.

with

An optional string giving a recommended replacement for the deprecated behaviour. This takes the same form as what.

details

In most cases the deprecation message can be automatically generated from with. When it can't, use details to provide a hand-written message.

details can either be a single string or a character vector, which will be converted to a bulleted list. By default, info bullets are used. Provide a named vectors to override.

id

The id of the deprecation. A warning is issued only once for each id. Defaults to the generated message, but you should give a unique ID when the message in details is built programmatically and depends on inputs, or when you'd like to deprecate multiple functions but warn only once for all of them.

env, user_env

Pair of environments that define where deprecate_*() was called (used to determine the package name) and where the function called the deprecating function was called (used to determine if deprecate_soft() should message).

These are only needed if you're calling deprecate_*() from an internal helper, in which case you should forward env = caller_env() and user_env = caller_env(2).

always

If FALSE, the default, will warn every 8 hours. If TRUE, will always warn in direct usages. Indirect usages keep warning every 8 hours to avoid disrupting users who can't fix the issue. Only use always = TRUE after at least one release with the default.

Conditions

Deprecation warnings have class lifecycle_warning_deprecated.
Deprecation errors have class lifecycle_error_deprecated.

Examples

Run this code

# A deprecated function `foo`:
deprecate_warn("1.0.0", "foo()")

# A deprecated argument `arg`:
deprecate_warn("1.0.0", "foo(arg)")

# A partially deprecated argument `arg`:
deprecate_warn("1.0.0", "foo(arg = 'must be a scalar integer')")

# A deprecated function with a function replacement:
deprecate_warn("1.0.0", "foo()", "bar()")

# A deprecated function with a function replacement from a
# different package:
deprecate_warn("1.0.0", "foo()", "otherpackage::bar()")

# A deprecated function with custom message:
deprecate_warn(
  when = "1.0.0",
  what = "foo()",
  details = "Please use `otherpackage::bar(foo = TRUE)` instead"
)

# A deprecated function with custom bulleted list:
deprecate_warn(
  when = "1.0.0",
  what = "foo()",
  details = c(
    x = "This is dangerous",
    i = "Did you mean `safe_foo()` instead?"
  )
)