fix: pass the absolute assets folder to the show_dash app

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Latest
 
+## What's Changed
+* :bug: `show_dash()` no longer fails with a `ValueError` on Windows when the working directory is on another drive than plotly-resampler (#362) by @raashish1601
+
 
 # v0.11.1 (2026-10-04)
 The README now points to [FlexViz](https://github.com/flex-analytics/flexviz), our successor project for whole-dashboard cross-filtering at scale.

plotly_resampler/figure_resampler/figure_resampler.py

@@ -10,7 +10,6 @@
 
 __author__ = "Jonas Van Der Donckt, Jeroen Van Der Donckt, Emiel Deprost"
 
-import os
 import warnings
 from pathlib import Path
 from typing import List, Optional, Tuple, Union
@@ -568,7 +567,7 @@ def show_dash(
         if self._create_overview:
             # fmt: off
             # Add the assets folder to the init_dash_kwargs
-            init_dash_kwargs["assets_folder"] = os.path.relpath(ASSETS_FOLDER, os.getcwd())
+            init_dash_kwargs["assets_folder"] = ASSETS_FOLDER
             # Also include the lodash script, as the client-side callbacks uses this
             init_dash_kwargs["external_scripts"] = ["https://cdn.jsdelivr.net/npm/lodash/lodash.min.js" ]
             # fmt: on

tests/test_figure_resampler.py

@@ -1250,6 +1250,23 @@ def test_show_dash_graph_config_not_null(monkeypatch):
     assert all(isinstance(g["props"]["config"], dict) for g in graphs)
 
 
+def test_show_dash_assets_folder_outside_cwd(monkeypatch, tmp_path):
+    # The assets folder must not depend on the cwd, which can be on another drive
+    # than plotly-resampler on Windows (see #362)
+    import dash
+
+    from plotly_resampler import ASSETS_FOLDER
+
+    monkeypatch.setattr(dash.Dash, "run", lambda *args, **kwargs: None)
+    monkeypatch.chdir(tmp_path)
+    fr = FigureResampler(go.Figure(), create_overview=True)
+    fr.add_trace(go.Scattergl(name="test"), hf_y=np.arange(10_000))
+    fr.show_dash(mode="inline")
+
+    assert fr._app.config.assets_folder == ASSETS_FOLDER
+    assert fr._app.server.test_client().get("/assets/coarse_fine.js").status_code == 200
+
+
 def test_show_dash_default_mode(monkeypatch):
     import dash