# The Exception object set by Kernel#raise.
$!: Exception | nil

# The array contains the module names loaded by require.
$": Array[String]

# The process number of the Ruby running this script. Same as Process.pid.
$$: Integer

# The string matched by the last successful match.
$&: String | nil

# The string to the right of the last successful match.
$': String | nil

# The same as ARGV.
$*: Array[String]

# The highest group matched by the last successful match.
$+: String | nil

# The output field separator for Kernel#print and Array#join. Non-nil $, will be deprecated.
$,: String | nil

# The input record separator, newline by default.
$-0: String | nil

# The default separator for String#split. Non-nil $; will be deprecated.
$-F: Regexp | String | nil

# Load path for searching Ruby scripts and extension libraries used
# by Kernel#load and Kernel#require.
# Has a singleton method <code>$LOAD_PATH.resolve_feature_path(feature)</code>
# that returns [+:rb+ or +:so+, path], which resolves the feature to
# the path the original Kernel#require method would load.
$-I: Array[String]

$-W: 0 | 1 | 2

# True if option <tt>-a</tt> is set. Read-only variable.
$-a: bool

# The debug flag, which is set by the <tt>-d</tt> switch.  Enabling debug
# output prints each exception raised to $stderr (but not its
# backtrace).  Setting this to a true value enables debug output as
# if <tt>-d</tt> were given on the command line.  Setting this to a false
# value disables debug output.
$-d: bool

# In in-place-edit mode, this variable holds the extension, otherwise +nil+.
$-i: String?

# True if option <tt>-l</tt> is set. Read-only variable.
$-l: bool

# True if option <tt>-p</tt> is set. Read-only variable.
$-p: bool

# The verbose flag, which is set by the <tt>-w</tt> or <tt>-v</tt> switch.
# Setting this to a true value enables warnings as if <tt>-w</tt> or <tt>-v</tt> were given
# on the command line.  Setting this to +nil+ disables warnings,
# including from Kernel#warn.
$-v: bool | nil

# The verbose flag, which is set by the <tt>-w</tt> or <tt>-v</tt> switch.
# Setting this to a true value enables warnings as if <tt>-w</tt> or <tt>-v</tt> were given
# on the command line.  Setting this to +nil+ disables warnings,
# including from Kernel#warn.
$-w: bool | nil

# The current input line number of the last file that was read.
$.: Integer

# The input record separator, newline by default. Aliased to $-0.
$/: String | nil

# Contains the name of the script being executed. May be assignable.
$0: String

# The Nth group of the last successful match. May be > 1.
$1: String | nil

# The Nth group of the last successful match. May be > 1.
$2: String | nil

# The Nth group of the last successful match. May be > 1.
$3: String | nil

# The Nth group of the last successful match. May be > 1.
$4: String | nil

# The Nth group of the last successful match. May be > 1.
$5: String | nil

# The Nth group of the last successful match. May be > 1.
$6: String | nil

# The Nth group of the last successful match. May be > 1.
$7: String | nil

# The Nth group of the last successful match. May be > 1.
$8: String | nil

# The Nth group of the last successful match. May be > 1.
$9: String | nil

# Load path for searching Ruby scripts and extension libraries used
# by Kernel#load and Kernel#require.
# Has a singleton method <code>$LOAD_PATH.resolve_feature_path(feature)</code>
# that returns [+:rb+ or +:so+, path], which resolves the feature to
# the path the original Kernel#require method would load.
$:: Array[String]

# The default separator for String#split. Non-nil $; will be deprecated. Aliased to $-F.
$;: Regexp | String | nil

# The same as ARGF.
$<: IO

# This variable is no longer effective. Deprecated.
$=: bool

# The default output stream for Kernel#print and Kernel#printf. $stdout by default.
$>: IO

# The status of the last executed child process (thread-local).
$?: Process::Status | nil

# The same as <code>$!.backtrace</code>.
$@: Array[String] | nil

# The debug flag, which is set by the <tt>-d</tt> switch.  Enabling debug
# output prints each exception raised to $stderr (but not its
# backtrace).  Setting this to a true value enables debug output as
# if <tt>-d</tt> were given on the command line.  Setting this to a false
# value disables debug output. Aliased to $-d.
$DEBUG: bool

# Current input filename from ARGF. Same as ARGF.filename.
$FILENAME: String

# The array contains the module names loaded by require.
$LOADED_FEATURES: Array[String]

# Load path for searching Ruby scripts and extension libraries used
# by Kernel#load and Kernel#require. Aliased to $: and $-I.
# Has a singleton method <code>$LOAD_PATH.resolve_feature_path(feature)</code>
# that returns [+:rb+ or +:so+, path], which resolves the feature to
# the path the original Kernel#require method would load.
$LOAD_PATH: Array[String]

# Contains the name of the script being executed. May be assignable.
$PROGRAM_NAME: String

# The verbose flag, which is set by the <tt>-w</tt> or <tt>-v</tt> switch.
# Setting this to a true value enables warnings as if <tt>-w</tt> or <tt>-v</tt> were given
# on the command line.  Setting this to +nil+ disables warnings,
# including from Kernel#warn. Aliased to $-v and $-w.
$VERBOSE: bool | nil

# The output record separator for Kernel#print and IO#write. Default is +nil+.
$\: String | nil

# The last input line of string by gets or readline.
$_: String | nil

# The string to the left of the last successful match.
$`: String | nil

# The current standard error output.
$stderr: IO

# The current standard input.
$stdin: IO

# The current standard output.
$stdout: IO

# The information about the last match in the current scope (thread-local and frame-local).
$~: MatchData | nil