diff --git a/rslib/proto/python.rs b/rslib/proto/python.rs
index bf9d30944..db63d612a 100644
--- a/rslib/proto/python.rs
+++ b/rslib/proto/python.rs
@@ -1,12 +1,12 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-use std::io::BufWriter;
+use std::io::Cursor;
 use std::io::Write;
 use std::path::Path;
 
 use anki_io::create_dir_all;
-use anki_io::create_file;
+use anki_io::write_file_if_changed;
 use anki_proto_gen::BackendService;
 use anki_proto_gen::Method;
 use anyhow::Result;
@@ -18,7 +18,7 @@ use prost_reflect::MessageDescriptor;
 pub(crate) fn write_python_interface(services: &[BackendService]) -> Result<()> {
     let output_path = Path::new("../../out/pylib/anki/_backend_generated.py");
     create_dir_all(output_path.parent().unwrap())?;
-    let mut out = BufWriter::new(create_file(output_path)?);
+    let mut out = Cursor::new(Vec::new());
     write_header(&mut out)?;
 
     for service in services {
@@ -29,6 +29,7 @@ pub(crate) fn write_python_interface(services: &[BackendService]) -> Result<()>
             render_method(service, method, &mut out);
         }
     }
+    write_file_if_changed(output_path, out.into_inner())?;
 
     Ok(())
 }
diff --git a/rslib/proto/typescript.rs b/rslib/proto/typescript.rs
index d241bcd53..52cb0ded8 100644
--- a/rslib/proto/typescript.rs
+++ b/rslib/proto/typescript.rs
@@ -11,6 +11,7 @@ use anki_proto_gen::BackendService;
 use anki_proto_gen::Method;
 use anyhow::Result;
 use inflections::Inflect;
+use itertools::Itertools;
 
 pub(crate) fn write_ts_interface(services: &[BackendService]) -> Result<()> {
     let root = Path::new("../../out/ts/lib");
@@ -59,7 +60,7 @@ import type { PostProtoOptions } from "./post";
 
 fn imports(referenced_packages: HashSet<String>) -> String {
     let mut out = String::new();
-    for package in referenced_packages {
+    for package in referenced_packages.iter().sorted() {
         writeln!(
             &mut out,
             "import * as {} from \"./anki/{}_pb\";",
diff --git a/ts/tools/markpure.ts b/ts/tools/markpure.ts
index 735f0ae55..534038cce 100644
--- a/ts/tools/markpure.ts
+++ b/ts/tools/markpure.ts
@@ -28,10 +28,10 @@ function adjustFiles() {
 
     const jsFiles = allFilesInDir(root).filter(f => f.endsWith(".js"));
     for (const file of jsFiles) {
-        let contents = fs.readFileSync(file, "utf8");
+        const contents = fs.readFileSync(file, "utf8");
 
         // allow tree shaking on proto messages
-        contents = contents.replace(
+        let newContents = contents.replace(
             /= proto3.make/g,
             "= /* @__PURE__ */ proto3.make",
         );
@@ -39,9 +39,11 @@ function adjustFiles() {
         // strip out typeName info, which appears to only be required for
         // certain JSON functionality (though this only saves a few hundred
         // bytes)
-        contents = contents.replace(typeRe, "$1(\"\",");
+        newContents = contents.replace(typeRe, "$1(\"\",");
 
-        fs.writeFileSync(file, contents, "utf8");
+        if (contents != newContents) {
+            fs.writeFileSync(file, newContents, "utf8");
+        }
     }
 }