support setting plotly.js path

Author: emilykl

plotly/io/_defaults.py

@@ -13,6 +13,7 @@ def __init__(self):
         self.default_scale = 1
         self.mathjax = None
         self.topojson = None
+        self.plotlyjs = None
 
 
 defaults = _Defaults()

plotly/io/_kaleido.py

@@ -369,6 +369,12 @@ def to_image(
         from kaleido.errors import ChromeNotFoundError
 
         try:
+            kopts = {}
+            if defaults.mathjax:
+                kopts["mathjax"] = defaults.mathjax
+            if defaults.plotlyjs:
+                kopts["plotlyjs"] = defaults.plotlyjs
+
             # TODO: Refactor to make it possible to use a shared Kaleido instance here
             img_bytes = kaleido.calc_fig_sync(
                 fig_dict,
@@ -379,13 +385,7 @@ def to_image(
                     scale=scale or defaults.default_scale,
                 ),
                 topojson=defaults.topojson,
-                kopts=(
-                    dict(
-                        mathjax=defaults.mathjax,
-                    )
-                    if defaults.mathjax
-                    else None
-                ),
+                kopts=kopts,
             )
         except ChromeNotFoundError:
             raise RuntimeError(PLOTLY_GET_CHROME_ERROR_MSG)
@@ -692,15 +692,14 @@ def write_images(
     from kaleido.errors import ChromeNotFoundError
 
     try:
+        kopts = {}
+        if defaults.mathjax:
+            kopts["mathjax"] = defaults.mathjax
+        if defaults.plotlyjs:
+            kopts["plotlyjs"] = defaults.plotlyjs
         kaleido.write_fig_from_object_sync(
             kaleido_specs,
-            kopts=(
-                dict(
-                    mathjax=defaults.mathjax,
-                )
-                if defaults.mathjax
-                else None
-            ),
+            kopts=kopts,
         )
     except ChromeNotFoundError:
         raise RuntimeError(PLOTLY_GET_CHROME_ERROR_MSG)