diff --git a/solstone/apps/body/tests/test_body_app.py b/solstone/apps/body/tests/test_body_app.py
index 83a30100a..347323900 100644
--- a/solstone/apps/body/tests/test_body_app.py
+++ b/solstone/apps/body/tests/test_body_app.py
@@ -590,7 +590,8 @@ def test_drawer_render_emphasizes_digits_after_escaping_under_node():
     node = _node_or_skip()
     source = Path("solstone/convey/static/drawer.js").read_text(encoding="utf-8")
     functions = "\n".join(
-        _function_source(source, name) for name in ("escapeHtml", "render")
+        _function_source(source, name)
+        for name in ("escapeHtml", "formatLine", "render")
     )
     script = "\n".join(
         [
diff --git a/solstone/convey/static/drawer.js b/solstone/convey/static/drawer.js
index 8a0957e32..c8b9b41b2 100644
--- a/solstone/convey/static/drawer.js
+++ b/solstone/convey/static/drawer.js
@@ -17,15 +17,20 @@
     })[char]);
   }
 
+  function formatLine(line) {
+    const value = String(line ?? '').trim();
+    return value
+      ? escapeHtml(value).replace(/&#?\w+;|\d[\d,.:]*(?:\s?(?:am|pm|s))?/g, (m) => (m.startsWith('&') ? m : `<b>${m}</b>`))
+      : '';
+  }
+
   function render(options) {
     const config = options || {};
     const id = String(config.id ?? '').trim();
     const idAttr = id ? ` data-drawer-id="${escapeHtml(id)}"` : '';
     const openAttr = config.open ? ' open' : '';
-    const line = String(config.line ?? '').trim();
-    const lineHtml = line
-      ? `<span class="drawer-line">${escapeHtml(line).replace(/&#?\w+;|\d[\d,.:]*(?:\s?(?:am|pm|s))?/g, (m) => (m.startsWith('&') ? m : `<b>${m}</b>`))}</span>`
-      : '';
+    const line = formatLine(config.line);
+    const lineHtml = line ? `<span class="drawer-line">${line}</span>` : '';
     const chipText = String(config.chipText ?? '').trim();
     const chipTone = config.chipTone === 'warn' || config.chipTone === 'danger'
       ? ` drawer-chip--${config.chipTone}`
@@ -65,5 +70,5 @@
     return result;
   }
 
-  window.Drawer = Object.freeze({ render, preserveOpen });
+  window.Drawer = Object.freeze({ render, preserveOpen, formatLine });
 })();
diff --git a/tests/test_convey_drawer.py b/tests/test_convey_drawer.py
index 137da3613..d597806e3 100644
--- a/tests/test_convey_drawer.py
+++ b/tests/test_convey_drawer.py
@@ -59,7 +59,9 @@ def test_drawer_js_contract_and_constraints():
 
     assert "(function () {" in source
     assert "'use strict';" in source
-    assert "window.Drawer = Object.freeze({ render, preserveOpen });" in source
+    assert (
+        "window.Drawer = Object.freeze({ render, preserveOpen, formatLine });" in source
+    )
     assert "Storage" not in source
     assert "localStorage" not in source
     assert "sessionStorage" not in source
@@ -285,6 +287,8 @@ const directDrawer = window.Drawer.render({
   line: "median statement length 1.5s — needs 2s",
   bodyHtml: "",
 });
+assert(Object.keys(window.Drawer).join("|") === "render|preserveOpen|formatLine", "drawer exports formatLine");
+assert(window.Drawer.formatLine("2 files created · <5>").includes("<b>2</b> files created · &lt;<b>5</b>&gt;"), "formatLine escapes and emphasizes digits");
 assert(lineHtml(directDrawer).includes("<b>1.5s</b>"), "drawer emphasizes compact seconds");
 
 const tooFewPayload = payload();