diff --git a/crates/wcstringutil/src/lib.rs b/crates/wcstringutil/src/lib.rs
index 7f1c1d622..10cbf4d73 100644
--- a/crates/wcstringutil/src/lib.rs
+++ b/crates/wcstringutil/src/lib.rs
@@ -1,5 +1,10 @@
 //! Helper functions for working with wcstring.
 
+use std::{
+    ffi::{CStr, CString, OsString},
+    os::unix::ffi::OsStringExt as _,
+};
+
 use fish_common::{get_ellipsis_char, get_ellipsis_str};
 use fish_fallback::{fish_wcwidth, lowercase, lowercase_rev, wcscasecmp, wcscasecmp_fuzzy};
 use fish_widestring::{decode_byte_from_char, prelude::*};
@@ -360,6 +365,121 @@ pub fn str2bytes_callback(input: impl IntoCharIter, mut func: impl FnMut(&[u8])
     true
 }
 
+/// Returns a newly allocated multibyte character string equivalent of the specified wide character
+/// string.
+///
+/// This function decodes illegal character sequences in a reversible way using the private use
+/// area.
+pub fn wcs2bytes(input: impl IntoCharIter) -> Vec<u8> {
+    let mut result = vec![];
+    wcs2bytes_appending(&mut result, input);
+    result
+}
+
+pub fn wcs2osstring(input: &wstr) -> OsString {
+    if input.is_empty() {
+        return OsString::new();
+    }
+
+    let mut result = vec![];
+    wcs2bytes_appending(&mut result, input);
+    OsString::from_vec(result)
+}
+
+/// Same as [`wcs2bytes`]. Meant to be used when we need a zero-terminated string to feed legacy APIs.
+/// Note: if `input` contains any interior NUL bytes, the result will be truncated at the first!
+pub fn wcs2zstring(input: &wstr) -> CString {
+    if input.is_empty() {
+        return CString::default();
+    }
+
+    let mut vec = Vec::with_capacity(input.len() + 1);
+    str2bytes_callback(input, |buff| {
+        vec.extend_from_slice(buff);
+        true
+    });
+    vec.push(b'\0');
+
+    match CString::from_vec_with_nul(vec) {
+        Ok(cstr) => cstr,
+        Err(err) => {
+            // `input` contained a NUL in the middle; we can retrieve `vec`, though
+            let mut vec = err.into_bytes();
+            let pos = vec.iter().position(|c| *c == b'\0').unwrap();
+            vec.truncate(pos + 1);
+            // Safety: We truncated after the first NUL
+            unsafe { CString::from_vec_with_nul_unchecked(vec) }
+        }
+    }
+}
+
+/// Like [`wcs2bytes`], but appends to `output` instead of returning a new string.
+pub fn wcs2bytes_appending(output: &mut Vec<u8>, input: impl IntoCharIter) {
+    str2bytes_callback(input, |buff| {
+        output.extend_from_slice(buff);
+        true
+    });
+}
+
+/// A trait to make it more convenient to pass ascii/Unicode strings to functions that can take
+/// non-Unicode values. The result is nul-terminated and can be passed to OS functions.
+///
+/// This is only implemented for owned types where an owned instance will skip allocations (e.g.
+/// `CString` can return `self`) but not implemented for owned instances where a new allocation is
+/// always required (e.g. implemented for `&wstr` but not `WideString`) because you might as well be
+/// left with the original item if we're going to allocate from scratch in all cases.
+pub trait ToCString {
+    /// Correctly convert to a nul-terminated [`CString`] that can be passed to OS functions.
+    fn to_cstring(self) -> CString;
+}
+
+impl ToCString for CString {
+    fn to_cstring(self) -> CString {
+        self
+    }
+}
+
+impl ToCString for &CStr {
+    fn to_cstring(self) -> CString {
+        self.to_owned()
+    }
+}
+
+/// Safely converts from `&wstr` to a `CString` to a nul-terminated `CString` that can be passed to
+/// OS functions, taking into account non-Unicode values that have been shifted into the private-use
+/// range by using [`wcs2zstring()`].
+impl ToCString for &wstr {
+    /// The wide string may contain non-Unicode bytes mapped to the private-use Unicode range, so we
+    /// have to use [`wcs2zstring()`](self::wcs2zstring) to convert it correctly.
+    fn to_cstring(self) -> CString {
+        self::wcs2zstring(self)
+    }
+}
+
+/// Safely converts from `&WString` to a nul-terminated `CString` that can be passed to OS
+/// functions, taking into account non-Unicode values that have been shifted into the private-use
+/// range by using [`wcs2zstring()`].
+impl ToCString for &WString {
+    fn to_cstring(self) -> CString {
+        self.as_utfstr().to_cstring()
+    }
+}
+
+/// Convert a (probably ascii) string to CString that can be passed to OS functions.
+impl ToCString for Vec<u8> {
+    fn to_cstring(mut self) -> CString {
+        self.push(b'\0');
+        CString::from_vec_with_nul(self).unwrap()
+    }
+}
+
+/// Convert a (probably ascii) string to nul-terminated CString that can be passed to OS functions.
+impl ToCString for &[u8] {
+    fn to_cstring(self) -> CString {
+        CString::new(self).unwrap()
+    }
+}
+
 /// Split a string by runs of any of the separator characters provided in `seps`.
 /// Note the delimiters are the characters in `seps`, not `seps` itself.
 /// `seps` may contain the NUL character.
diff --git a/src/autoload.rs b/src/autoload.rs
index 9e7d624ea..aa4537e20 100644
--- a/src/autoload.rs
+++ b/src/autoload.rs
@@ -1,12 +1,12 @@
 //! The classes responsible for autoloading functions and completions.
 
-use crate::common::wcs2bytes;
 use crate::common::{ScopeGuard, escape};
 use crate::env::Environment;
 use crate::flogf;
 use crate::io::IoChain;
 use crate::parser::Parser;
 use crate::wutil::{FileId, INVALID_FILE_ID, file_id_for_path};
+use fish_wcstringutil::wcs2bytes;
 use fish_widestring::{L, WExt as _, WString, wstr};
 use lru::LruCache;
 use rust_embed::RustEmbed;
@@ -463,8 +463,8 @@ mod tests {
     #[serial]
     fn test_autoload() {
         let _cleanup = test_init();
-        use crate::common::wcs2zstring;
         use crate::fds::wopen_cloexec;
+        use fish_wcstringutil::wcs2zstring;
         use nix::fcntl::OFlag;
 
         macro_rules! run {
diff --git a/src/bin/fish.rs b/src/bin/fish.rs
index bce70de43..2f7cb0ddc 100644
--- a/src/bin/fish.rs
+++ b/src/bin/fish.rs
@@ -28,7 +28,7 @@
     },
     common::{
         PACKAGE_NAME, PROFILING_ACTIVE, PROGRAM_NAME, bytes2wcstring, escape, osstr2wcstring,
-        save_term_foreground_process_group, wcs2bytes,
+        save_term_foreground_process_group,
     },
     env::{
         EnvMode, Statuses,
@@ -61,6 +61,7 @@
     topic_monitor,
     wutil::waccess,
 };
+use fish_wcstringutil::wcs2bytes;
 use libc::STDIN_FILENO;
 use nix::unistd::AccessFlags;
 use std::ffi::{OsStr, OsString};
diff --git a/src/builtins/fish_indent.rs b/src/builtins/fish_indent.rs
index cccc17aa8..8dd2bef5e 100644
--- a/src/builtins/fish_indent.rs
+++ b/src/builtins/fish_indent.rs
@@ -14,7 +14,7 @@
 };
 use crate::common::{
     PROGRAM_NAME, ReadExt as _, UnescapeFlags, UnescapeStringStyle, bytes2wcstring,
-    get_program_name, osstr2wcstring, unescape_string, wcs2bytes,
+    get_program_name, osstr2wcstring, unescape_string,
 };
 use crate::env::EnvStack;
 use crate::env::env_init;
@@ -33,7 +33,7 @@
 use crate::topic_monitor::topic_monitor_init;
 use crate::wutil::fish_iswalnum;
 use assert_matches::assert_matches;
-use fish_wcstringutil::count_preceding_backslashes;
+use fish_wcstringutil::{count_preceding_backslashes, wcs2bytes};
 use fish_wgetopt::{ArgType, WGetopter, WOption, wopt};
 use std::fmt::Write as _;
 
diff --git a/src/builtins/status.rs b/src/builtins/status.rs
index 696d744df..a43df9d84 100644
--- a/src/builtins/status.rs
+++ b/src/builtins/status.rs
@@ -9,6 +9,8 @@
 use crate::tty_handoff::{TERMINAL_OS_NAME, get_scroll_content_up_capability, xtversion};
 use crate::wutil::{Error, waccess, wbasename, wdirname, wrealpath};
 use cfg_if::cfg_if;
+use fish_util::wcsfilecmp_glob;
+use fish_wcstringutil::wcs2bytes;
 use nix::unistd::AccessFlags;
 use rust_embed::RustEmbed;
 
@@ -467,7 +469,7 @@ pub fn status(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr]) -> B
                 ));
                 return Err(STATUS_INVALID_ARGS);
             }
-            let arg = crate::common::wcs2bytes(args[0]);
+            let arg = wcs2bytes(args[0]);
             let arg = std::str::from_utf8(&arg).unwrap();
             let Some(emfile) = crate::autoload::Asset::get(arg)
                 .or_else(|| Docs::get(arg))
@@ -521,10 +523,9 @@ pub fn status(parser: &Parser, streams: &mut IoStreams, args: &mut [&wstr]) -> B
             }
         }
         STATUS_LIST_FILES => {
-            use fish_util::wcsfilecmp_glob;
             let mut paths = vec![];
             let mut add = |arg| {
-                let arg = crate::common::wcs2bytes(arg);
+                let arg = wcs2bytes(arg);
                 let arg = std::str::from_utf8(&arg).unwrap();
                 for path in crate::autoload::Asset::iter()
                     .chain(Docs::iter())
diff --git a/src/common.rs b/src/common.rs
index 08a41d1aa..e6c459669 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -15,13 +15,13 @@
 use crate::wildcard::{ANY_CHAR, ANY_STRING, ANY_STRING_RECURSIVE};
 use crate::wutil::fish_iswalnum;
 use fish_fallback::fish_wcwidth;
-use fish_wcstringutil::str2bytes_callback;
+use fish_wcstringutil::wcs2bytes;
 use fish_widestring::{
     ENCODE_DIRECT_END, decode_byte_from_char, encode_byte_to_char, subslice_position,
 };
 use nix::sys::termios::Termios;
 use std::env;
-use std::ffi::{CStr, CString, OsStr, OsString};
+use std::ffi::{CStr, OsStr};
 use std::os::unix::prelude::*;
 use std::sync::atomic::Ordering;
 use std::sync::{Arc, MutexGuard, OnceLock};
@@ -999,62 +999,6 @@ pub(crate) fn charptr2wcstring(input: *const libc::c_char) -> WString {
     bytes2wcstring(input)
 }
 
-/// Returns a newly allocated multibyte character string equivalent of the specified wide character
-/// string.
-///
-/// This function decodes illegal character sequences in a reversible way using the private use
-/// area.
-pub fn wcs2bytes(input: impl IntoCharIter) -> Vec<u8> {
-    let mut result = vec![];
-    wcs2bytes_appending(&mut result, input);
-    result
-}
-
-pub fn wcs2osstring(input: &wstr) -> OsString {
-    if input.is_empty() {
-        return OsString::new();
-    }
-
-    let mut result = vec![];
-    wcs2bytes_appending(&mut result, input);
-    OsString::from_vec(result)
-}
-
-/// Same as [`wcs2bytes`]. Meant to be used when we need a zero-terminated string to feed legacy APIs.
-/// Note: if `input` contains any interior NUL bytes, the result will be truncated at the first!
-pub fn wcs2zstring(input: &wstr) -> CString {
-    if input.is_empty() {
-        return CString::default();
-    }
-
-    let mut vec = Vec::with_capacity(input.len() + 1);
-    str2bytes_callback(input, |buff| {
-        vec.extend_from_slice(buff);
-        true
-    });
-    vec.push(b'\0');
-
-    match CString::from_vec_with_nul(vec) {
-        Ok(cstr) => cstr,
-        Err(err) => {
-            // `input` contained a NUL in the middle; we can retrieve `vec`, though
-            let mut vec = err.into_bytes();
-            let pos = vec.iter().position(|c| *c == b'\0').unwrap();
-            vec.truncate(pos + 1);
-            // Safety: We truncated after the first NUL
-            unsafe { CString::from_vec_with_nul_unchecked(vec) }
-        }
-    }
-}
-
-/// Like [`wcs2bytes`], but appends to `output` instead of returning a new string.
-pub fn wcs2bytes_appending(output: &mut Vec<u8>, input: impl IntoCharIter) {
-    str2bytes_callback(input, |buff| {
-        output.extend_from_slice(buff);
-        true
-    });
-}
-
 /// Stored in blocks to reference the file which created the block.
 pub type FilenameRef = Arc<WString>;
 
@@ -1309,65 +1253,6 @@ pub fn valid_var_name(s: &wstr) -> bool {
     !s.is_empty() && s.chars().all(valid_var_name_char)
 }
 
-/// A trait to make it more convenient to pass ascii/Unicode strings to functions that can take
-/// non-Unicode values. The result is nul-terminated and can be passed to OS functions.
-///
-/// This is only implemented for owned types where an owned instance will skip allocations (e.g.
-/// `CString` can return `self`) but not implemented for owned instances where a new allocation is
-/// always required (e.g. implemented for `&wstr` but not `WideString`) because you might as well be
-/// left with the original item if we're going to allocate from scratch in all cases.
-pub trait ToCString {
-    /// Correctly convert to a nul-terminated [`CString`] that can be passed to OS functions.
-    fn to_cstring(self) -> CString;
-}
-
-impl ToCString for CString {
-    fn to_cstring(self) -> CString {
-        self
-    }
-}
-
-impl ToCString for &CStr {
-    fn to_cstring(self) -> CString {
-        self.to_owned()
-    }
-}
-
-/// Safely converts from `&wstr` to a `CString` to a nul-terminated `CString` that can be passed to
-/// OS functions, taking into account non-Unicode values that have been shifted into the private-use
-/// range by using [`wcs2zstring()`].
-impl ToCString for &wstr {
-    /// The wide string may contain non-Unicode bytes mapped to the private-use Unicode range, so we
-    /// have to use [`wcs2zstring()`](self::wcs2zstring) to convert it correctly.
-    fn to_cstring(self) -> CString {
-        self::wcs2zstring(self)
-    }
-}
-
-/// Safely converts from `&WString` to a nul-terminated `CString` that can be passed to OS
-/// functions, taking into account non-Unicode values that have been shifted into the private-use
-/// range by using [`wcs2zstring()`].
-impl ToCString for &WString {
-    fn to_cstring(self) -> CString {
-        self.as_utfstr().to_cstring()
-    }
-}
-
-/// Convert a (probably ascii) string to CString that can be passed to OS functions.
-impl ToCString for Vec<u8> {
-    fn to_cstring(mut self) -> CString {
-        self.push(b'\0');
-        CString::from_vec_with_nul(self).unwrap()
-    }
-}
-
-/// Convert a (probably ascii) string to nul-terminated CString that can be passed to OS functions.
-impl ToCString for &[u8] {
-    fn to_cstring(self) -> CString {
-        CString::new(self).unwrap()
-    }
-}
-
 #[macro_export]
 macro_rules! env_stack_set_from_env {
     ($vars:ident, $var_name:literal) => {{
diff --git a/src/env/environment_impl.rs b/src/env/environment_impl.rs
index 27bd1c269..1725295a0 100644
--- a/src/env/environment_impl.rs
+++ b/src/env/environment_impl.rs
@@ -1,4 +1,3 @@
-use crate::common::wcs2zstring;
 use crate::env::{
     ELECTRIC_VARIABLES, ElectricVar, EnvMode, EnvSetMode, EnvStackSetResult, EnvVar, EnvVarFlags,
     PATH_ARRAY_SEP, Statuses, VarTable, is_read_only,
@@ -10,11 +9,12 @@
 use crate::kill::kill_entries;
 use crate::nix::umask;
 use crate::null_terminated_array::OwningNullTerminatedArray;
+use crate::portable_atomic::AtomicU64;
 use crate::prelude::*;
 use crate::reader::{commandline_get_state, reader_status_count};
 use crate::threads::{is_forked_child, is_main_thread};
 use crate::wutil::fish_wcstol_radix;
-
+use fish_wcstringutil::wcs2zstring;
 use std::cell::{RefCell, UnsafeCell};
 use std::collections::HashSet;
 use std::ffi::CString;
@@ -22,8 +22,6 @@
 use std::mem;
 use std::ops::{Deref, DerefMut};
 use std::sync::LazyLock;
-
-use crate::portable_atomic::AtomicU64;
 use std::sync::{Arc, Mutex, MutexGuard, atomic::Ordering};
 
 /// Getter for universal variables.
diff --git a/src/env/mod.rs b/src/env/mod.rs
index c8d6eefdf..a8eeb5fc1 100644
--- a/src/env/mod.rs
+++ b/src/env/mod.rs
@@ -3,8 +3,8 @@
 mod environment_impl;
 pub mod var;
 
-use crate::common::ToCString;
 pub use environment::*;
+use fish_wcstringutil::ToCString;
 use std::sync::{Mutex, atomic::AtomicUsize};
 pub use var::*;
 
@@ -22,7 +22,7 @@
 /// environment variables.
 ///
 /// As values could contain non-unicode characters, they must first be converted from &wstr to a
-/// `CString` with [`crate::common::wcs2zstring()`].
+/// `CString` with [`fish_wcstringutil::wcs2zstring()`].
 pub fn setenv_lock<S1: ToCString, S2: ToCString>(name: S1, value: S2, overwrite: bool) {
     let name = name.to_cstring();
     let value = value.to_cstring();
diff --git a/src/env_universal_common.rs b/src/env_universal_common.rs
index dd1faeecf..d55a0a9c2 100644
--- a/src/env_universal_common.rs
+++ b/src/env_universal_common.rs
@@ -1,13 +1,11 @@
-use crate::common::{
-    UnescapeFlags, UnescapeStringStyle, unescape_string, valid_var_name, wcs2zstring,
-};
+use crate::common::{UnescapeFlags, UnescapeStringStyle, unescape_string, valid_var_name};
 use crate::env::{EnvVar, EnvVarFlags, VarTable};
 use crate::flog::{flog, flogf};
 use crate::fs::{PotentialUpdate, lock_and_load, rewrite_via_temporary_file};
 use crate::path::path_get_config;
 use crate::prelude::*;
 use crate::wutil::{FileId, INVALID_FILE_ID, file_id_for_file, file_id_for_path_narrow, wrealpath};
-use fish_wcstringutil::{LineIterator, join_strings};
+use fish_wcstringutil::{LineIterator, join_strings, wcs2zstring};
 use fish_widestring::decode_byte_from_char;
 use itertools::Itertools as _;
 use std::collections::HashSet;
@@ -808,15 +806,15 @@ fn skip_spaces(mut s: &wstr) -> &wstr {
 
 #[cfg(test)]
 mod tests {
-    use fish_tempfile::TempDir;
-    use fish_widestring::{ENCODE_DIRECT_BASE, char_offset};
-
-    use crate::common::{osstr2wcstring, wcs2osstring};
+    use crate::common::osstr2wcstring;
     use crate::env::{EnvVar, EnvVarFlags, VarTable};
     use crate::env_universal_common::{EnvUniversal, UvarFormat};
     use crate::prelude::*;
     use crate::tests::prelude::*;
     use crate::wutil::{INVALID_FILE_ID, file_id_for_path};
+    use fish_tempfile::TempDir;
+    use fish_wcstringutil::wcs2osstring;
+    use fish_widestring::{ENCODE_DIRECT_BASE, char_offset};
 
     const UVARS_PER_THREAD: usize = 8;
 
diff --git a/src/exec.rs b/src/exec.rs
index bd619eb9e..0349e4a55 100644
--- a/src/exec.rs
+++ b/src/exec.rs
@@ -8,8 +8,7 @@
     builtin_run,
 };
 use crate::common::{
-    ScopeGuard, bytes2wcstring, exit_without_destructors, truncate_at_nul, wcs2bytes, wcs2zstring,
-    write_loop,
+    ScopeGuard, bytes2wcstring, exit_without_destructors, truncate_at_nul, write_loop,
 };
 use crate::env::{EnvMode, EnvSetMode, EnvStack, Environment as _, READ_BYTE_LIMIT, Statuses};
 #[cfg(have_posix_spawn)]
@@ -47,6 +46,7 @@
 use crate::tty_handoff::TtyHandoff;
 use crate::wutil::{fish_wcstol, perror};
 use errno::{errno, set_errno};
+use fish_wcstringutil::{wcs2bytes, wcs2zstring};
 use fish_widestring::ToWString as _;
 use libc::{
     EACCES, ENOENT, ENOEXEC, ENOTDIR, EPIPE, EXIT_FAILURE, EXIT_SUCCESS, STDERR_FILENO,
diff --git a/src/fds.rs b/src/fds.rs
index 1ba1e17b6..7044e0c7b 100644
--- a/src/fds.rs
+++ b/src/fds.rs
@@ -1,9 +1,9 @@
-use crate::common::wcs2zstring;
 use crate::flog::flog;
 use crate::prelude::*;
 use crate::signal::signal_check_cancel;
 use crate::wutil::perror;
 use cfg_if::cfg_if;
+use fish_wcstringutil::wcs2zstring;
 use libc::{EINTR, F_GETFD, F_GETFL, F_SETFD, F_SETFL, FD_CLOEXEC, O_NONBLOCK, c_int};
 use nix::fcntl::FcntlArg;
 use nix::fcntl::OFlag;
diff --git a/src/flog.rs b/src/flog.rs
index 95c980ba6..983063af9 100644
--- a/src/flog.rs
+++ b/src/flog.rs
@@ -1,8 +1,8 @@
-use crate::common::wcs2bytes;
 use crate::prelude::*;
 use crate::wildcard::wildcard_match;
 use crate::wutil::write_to_fd;
 use crate::{parse_util::unescape_wildcards, wutil::unescape_bytes_and_write_to_fd};
+use fish_wcstringutil::wcs2bytes;
 use libc::c_int;
 use std::sync::atomic::{AtomicI32, Ordering};
 
diff --git a/src/fs.rs b/src/fs.rs
index 7d9396a53..c7bd2f7fd 100644
--- a/src/fs.rs
+++ b/src/fs.rs
@@ -1,5 +1,5 @@
 use crate::{
-    common::{osstr2wcstring, wcs2bytes, wcs2osstring},
+    common::osstr2wcstring,
     fds::wopen_cloexec,
     flog, flogf,
     path::{DirRemoteness, path_remoteness},
@@ -9,6 +9,7 @@
     },
 };
 use fish_tempfile::random_filename;
+use fish_wcstringutil::{wcs2bytes, wcs2osstring};
 use libc::{LOCK_EX, LOCK_SH, c_int};
 use nix::{fcntl::OFlag, sys::stat::Mode};
 use std::{
diff --git a/src/function.rs b/src/function.rs
index 6df8b2ecb..763969286 100644
--- a/src/function.rs
+++ b/src/function.rs
@@ -15,6 +15,7 @@
 use crate::prelude::*;
 use crate::proc::Pid;
 use crate::wutil::dir_iter::DirIter;
+use fish_wcstringutil::wcs2bytes;
 use std::collections::{HashMap, HashSet};
 use std::num::NonZeroU32;
 use std::sync::{Arc, LazyLock, Mutex};
@@ -240,7 +241,7 @@ pub fn exists_no_autoload(cmd: &wstr) -> bool {
         return true;
     }
 
-    let narrow = crate::common::wcs2bytes(cmd);
+    let narrow = wcs2bytes(cmd);
     if let Ok(cmdstr) = std::str::from_utf8(&narrow) {
         let cmd = "functions/".to_owned() + cmdstr + ".fish";
         crate::autoload::has_asset(&cmd)
diff --git a/src/history/file.rs b/src/history/file.rs
index 6bdf7e4da..ae51cd81c 100644
--- a/src/history/file.rs
+++ b/src/history/file.rs
@@ -1,25 +1,23 @@
 //! Implementation of the YAML-like history file format.
 
-use std::{
-    fs::File,
-    io::Read as _,
-    ops::{Deref, DerefMut},
-    os::fd::AsRawFd as _,
-    time::{SystemTime, UNIX_EPOCH},
-};
-
-use libc::{ENODEV, MAP_ANONYMOUS, MAP_FAILED, MAP_PRIVATE, PROT_READ, PROT_WRITE};
-
 use super::HistoryItem;
 use super::yaml_backend::{
     decode_item_fish_2_0, escape_yaml_fish_2_0, offset_of_next_item_fish_2_0,
 };
 use crate::{
-    common::wcs2bytes,
     flog::flog,
     path::{DirRemoteness, path_get_data_remoteness},
     wutil::FileId,
 };
+use fish_wcstringutil::wcs2bytes;
+use libc::{ENODEV, MAP_ANONYMOUS, MAP_FAILED, MAP_PRIVATE, PROT_READ, PROT_WRITE};
+use std::{
+    fs::File,
+    io::Read as _,
+    ops::{Deref, DerefMut},
+    os::fd::AsRawFd as _,
+    time::{SystemTime, UNIX_EPOCH},
+};
 
 /// History file types.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
diff --git a/src/history/history.rs b/src/history/history.rs
index 346632463..4ae79a14c 100644
--- a/src/history/history.rs
+++ b/src/history/history.rs
@@ -1806,12 +1806,14 @@ mod tests {
         History, HistoryItem, HistorySearch, PathList, PersistenceMode, SearchDirection,
         SearchFlags, SearchType, VACUUM_FREQUENCY,
     };
-    use crate::common::{ESCAPE_TEST_CHAR, osstr2wcstring, wcs2bytes};
+    use crate::common::{ESCAPE_TEST_CHAR, osstr2wcstring};
     use crate::env::{EnvMode, EnvSetMode, EnvStack};
     use crate::fs::{LockedFile, WriteMethod};
     use crate::prelude::*;
     use fish_build_helper::workspace_root;
-    use fish_wcstringutil::{string_prefixes_string, string_prefixes_string_case_insensitive};
+    use fish_wcstringutil::{
+        string_prefixes_string, string_prefixes_string_case_insensitive, wcs2bytes,
+    };
     use rand::Rng as _;
     use rand::rngs::ThreadRng;
     use std::collections::VecDeque;
diff --git a/src/io.rs b/src/io.rs
index 130a85814..665122ce9 100644
--- a/src/io.rs
+++ b/src/io.rs
@@ -1,5 +1,5 @@
 use crate::builtins::shared::{STATUS_CMD_ERROR, STATUS_CMD_OK, STATUS_READ_TOO_MUCH};
-use crate::common::{bytes2wcstring, wcs2bytes};
+use crate::common::bytes2wcstring;
 use crate::fd_monitor::{Callback, FdMonitor, FdMonitorItemId};
 use crate::fds::{
     BorrowedFdFile, PIPE_ERROR, make_autoclose_pipes, make_fd_nonblocking, wopen_cloexec,
@@ -14,6 +14,7 @@
 use crate::topic_monitor::Topic;
 use crate::wutil::{perror, perror_io, unescape_bytes_and_write_to_fd, wdirname, wstat};
 use errno::Errno;
+use fish_wcstringutil::wcs2bytes;
 use libc::{EAGAIN, EINTR, ENOENT, ENOTDIR, EPIPE, EWOULDBLOCK, STDOUT_FILENO};
 use nix::fcntl::OFlag;
 use nix::sys::stat::Mode;
diff --git a/src/parser.rs b/src/parser.rs
index 1193f3cb9..16c480237 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -4,7 +4,7 @@
 use crate::builtins::shared::STATUS_ILLEGAL_CMD;
 use crate::common::{
     CancelChecker, EscapeFlags, EscapeStringStyle, FilenameRef, PROFILING_ACTIVE, ScopeGuarding,
-    ScopedCell, ScopedRefCell, escape_string, wcs2bytes,
+    ScopedCell, ScopedRefCell, escape_string,
 };
 use crate::complete::CompletionList;
 use crate::env::{
@@ -36,6 +36,7 @@
 use crate::{flog, flogf, function};
 use assert_matches::assert_matches;
 use fish_util::get_time;
+use fish_wcstringutil::wcs2bytes;
 use fish_widestring::WExt as _;
 use libc::c_int;
 use std::cell::{Ref, RefCell, RefMut};
diff --git a/src/path.rs b/src/path.rs
index 7112646fc..fd8a23803 100644
--- a/src/path.rs
+++ b/src/path.rs
@@ -2,7 +2,6 @@
 //! for testing if a command with a given name can be found in the PATH, and various other
 //! path-related issues.
 
-use crate::common::{wcs2osstring, wcs2zstring};
 use crate::env::{EnvMode, EnvSetMode, EnvStack, Environment, FALLBACK_PATH};
 use crate::expand::{HOME_DIRECTORY, expand_tilde};
 use crate::flog::{flog, flogf};
@@ -10,6 +9,7 @@
 use crate::wutil::{normalize_path, path_normalize_for_cd, waccess, wdirname, wstat};
 use cfg_if::cfg_if;
 use errno::{Errno, errno, set_errno};
+use fish_wcstringutil::{wcs2osstring, wcs2zstring};
 use libc::{EACCES, ENOENT, ENOTDIR, X_OK};
 use nix::unistd::AccessFlags;
 use std::ffi::OsStr;
diff --git a/src/screen.rs b/src/screen.rs
index f5621f2e2..848ecb114 100644
--- a/src/screen.rs
+++ b/src/screen.rs
@@ -7,29 +7,16 @@
 //! The current implementation is less smart than ncurses allows and can not for example move blocks
 //! of text around to handle text insertion.
 
-use crate::editable_line::line_at_cursor;
-use crate::key::ViewportPosition;
-use crate::pager::{PAGER_MIN_HEIGHT, PageRendering, Pager};
-use std::cell::RefCell;
-use std::collections::LinkedList;
-use std::io::Write as _;
-use std::num::NonZeroU16;
-use std::ops::Range;
-use std::sync::Mutex;
-use std::sync::atomic::AtomicU32;
-use std::time::SystemTime;
-
-use libc::{STDERR_FILENO, STDOUT_FILENO};
-use nix::sys::termios;
-
 use crate::common::{
-    get_ellipsis_char, get_omitted_newline_str, has_working_tty_timestamps, shell_modes, wcs2bytes,
-    write_loop,
+    get_ellipsis_char, get_omitted_newline_str, has_working_tty_timestamps, shell_modes, write_loop,
 };
+use crate::editable_line::line_at_cursor;
 use crate::env::Environment;
 use crate::flog::{flog, flogf};
 use crate::global_safety::RelaxedAtomicBool;
 use crate::highlight::{HighlightColorResolver, HighlightRole, HighlightSpec};
+use crate::key::ViewportPosition;
+use crate::pager::{PAGER_MIN_HEIGHT, PageRendering, Pager};
 use crate::prelude::*;
 use crate::terminal::SgrTerminalCommand::EnterDimMode;
 use crate::terminal::TerminalCommand::{
@@ -40,7 +27,17 @@
 use crate::termsize::Termsize;
 use crate::wutil::fstat;
 use fish_fallback::fish_wcwidth;
-use fish_wcstringutil::{fish_wcwidth_visible, string_prefixes_string};
+use fish_wcstringutil::{fish_wcwidth_visible, string_prefixes_string, wcs2bytes};
+use libc::{STDERR_FILENO, STDOUT_FILENO};
+use nix::sys::termios;
+use std::cell::RefCell;
+use std::collections::LinkedList;
+use std::io::Write as _;
+use std::num::NonZeroU16;
+use std::ops::Range;
+use std::sync::Mutex;
+use std::sync::atomic::AtomicU32;
+use std::time::SystemTime;
 
 #[derive(Copy, Clone, Default)]
 pub enum CharOffset {
diff --git a/src/terminal.rs b/src/terminal.rs
index 0d3005149..d141ad826 100644
--- a/src/terminal.rs
+++ b/src/terminal.rs
@@ -1,5 +1,5 @@
 // Generic output functions.
-use crate::common::{self, EscapeStringStyle, escape_string, wcs2bytes, wcs2bytes_appending};
+use crate::common::{self, EscapeStringStyle, escape_string};
 use crate::future_feature_flags::{self, FeatureFlag};
 use crate::prelude::*;
 use crate::screen::{is_dumb, only_grayscale};
@@ -7,6 +7,7 @@
 use crate::threads::MainThread;
 use bitflags::bitflags;
 use fish_color::{Color, Color24};
+use fish_wcstringutil::{wcs2bytes, wcs2bytes_appending};
 use std::cell::{RefCell, RefMut};
 use std::ops::{Deref, DerefMut};
 use std::os::fd::RawFd;
diff --git a/src/universal_notifier/inotify.rs b/src/universal_notifier/inotify.rs
index 268d050ac..9ad971f38 100644
--- a/src/universal_notifier/inotify.rs
+++ b/src/universal_notifier/inotify.rs
@@ -1,8 +1,8 @@
-use crate::common::wcs2osstring;
 use crate::env_universal_common::default_vars_path;
 use crate::prelude::*;
 use crate::universal_notifier::UniversalNotifier;
 use crate::wutil::{wbasename, wdirname};
+use fish_wcstringutil::wcs2osstring;
 use nix::sys::inotify::{AddWatchFlags, InitFlags, Inotify};
 use std::ffi::OsString;
 use std::os::fd::{AsFd as _, AsRawFd as _, RawFd};
diff --git a/src/universal_notifier/kqueue.rs b/src/universal_notifier/kqueue.rs
index 4fab5dec7..82eadcb73 100644
--- a/src/universal_notifier/kqueue.rs
+++ b/src/universal_notifier/kqueue.rs
@@ -1,9 +1,9 @@
-use crate::common::wcs2osstring;
 use crate::env_universal_common::default_vars_path;
 use crate::flogf;
 use crate::prelude::*;
 use crate::universal_notifier::UniversalNotifier;
 use crate::wutil::wdirname;
+use fish_wcstringutil::wcs2osstring;
 use nix::sys::event::{EvFlags, EventFilter, FilterFlag, KEvent, Kqueue};
 use std::fs::File;
 use std::os::fd::AsFd;
diff --git a/src/universal_notifier/test_helpers.rs b/src/universal_notifier/test_helpers.rs
index bf82a8e14..5a4daf734 100644
--- a/src/universal_notifier/test_helpers.rs
+++ b/src/universal_notifier/test_helpers.rs
@@ -17,7 +17,7 @@ pub fn test_notifiers(notifiers: &[&dyn UniversalNotifier], fish_variables_path:
 
     // Helper to simulate modifying a file, using the atomic rename() approach.
     let modify_path = |path: &wstr| -> Result<(), std::io::Error> {
-        use crate::common::wcs2osstring;
+        use fish_wcstringutil::wcs2osstring;
         use std::fs;
         use std::io::Write as _;
         let path = wcs2osstring(path);
diff --git a/src/wutil/dir_iter.rs b/src/wutil/dir_iter.rs
index 894c38ffe..363d051ef 100644
--- a/src/wutil/dir_iter.rs
+++ b/src/wutil/dir_iter.rs
@@ -1,7 +1,8 @@
 use super::wopendir;
-use crate::common::{bytes2wcstring, wcs2zstring};
+use crate::common::bytes2wcstring;
 use crate::wutil::DevInode;
 use cfg_if::cfg_if;
+use fish_wcstringutil::wcs2zstring;
 use fish_widestring::{WString, wstr};
 use libc::{
     EACCES, EIO, ELOOP, ENAMETOOLONG, ENODEV, ENOENT, ENOTDIR, S_IFBLK, S_IFCHR, S_IFDIR, S_IFIFO,
diff --git a/src/wutil/fileid.rs b/src/wutil/fileid.rs
index 9a8a1e959..49a4b3305 100644
--- a/src/wutil/fileid.rs
+++ b/src/wutil/fileid.rs
@@ -1,5 +1,5 @@
-use crate::common::wcs2zstring;
 use crate::wutil::wstr;
+use fish_wcstringutil::wcs2zstring;
 use std::ffi::{CStr, OsStr};
 use std::fs::{self, File, Metadata};
 use std::os::unix::prelude::*;
diff --git a/src/wutil/mod.rs b/src/wutil/mod.rs
index 130538f23..336e92817 100644
--- a/src/wutil/mod.rs
+++ b/src/wutil/mod.rs
@@ -7,13 +7,11 @@
 pub mod wcstod;
 pub mod wcstoi;
 
-use crate::common::{
-    bytes2wcstring, fish_reserved_codepoint, osstr2wcstring, wcs2bytes, wcs2osstring, wcs2zstring,
-};
+use crate::common::{bytes2wcstring, fish_reserved_codepoint, osstr2wcstring};
 use crate::fds::BorrowedFdFile;
 use crate::flog;
 use errno::errno;
-use fish_wcstringutil::{join_strings, str2bytes_callback};
+use fish_wcstringutil::{join_strings, str2bytes_callback, wcs2bytes, wcs2osstring, wcs2zstring};
 use fish_widestring::{IntoCharIter, L, WExt as _, WString, wstr};
 use nix::unistd::AccessFlags;
 use std::ffi::{CStr, OsStr};