Update Pyodide build to Python 3.14 / 2026

.github/workflows/build.yaml

@@ -511,7 +511,7 @@ jobs:
                 arch:
                     - x86_64
                 python-version:
-                    - "3.13"
+                    - "3.14"
                 node-version: [22.x]
         steps:
             - name: Checkout
@@ -526,17 +526,17 @@ jobs:
                   name: perspective-metadata
                   path: rust/
 
-            # Shares the `emscripten-wasm32` ccache prefix and `wasm32`
-            # emsdk sysroot with `build_js` — same toolchain, same target.
+            # Pyodide requires a newer Emscripten toolchain than the browser
+            # build, so its compiler and sysroot caches must remain separate.
             - name: Initialize Build
               id: init-step
               uses: ./.github/actions/install-deps
               with:
                   javascript: "false"
                   arch: ${{ matrix.arch }}
                   manylinux: "false"
-                  ccache: "emscripten-wasm32"
-                  emsdk_cache: "wasm32"
+                  ccache: "pyodide-wasm32"
+                  emsdk_cache: "pyodide-wasm32"
                   cargo_cache: "false"
                   cache_save: ${{ steps.config-step.outputs.SAVE_CACHE }}
                   skip_cache: ${{ steps.config-step.outputs.SKIP_CACHE }}
@@ -578,8 +578,8 @@ jobs:
                   for w in "${wheels[@]}"; do
                       echo "checking $w"
                       case "$w" in
-                          *pyemscripten_2025_0_wasm32.whl) ;;
-                          *) echo "::error::$w is not tagged pyemscripten_2025_0_wasm32"; exit 1 ;;
+                          *pyemscripten_2026_0_wasm32.whl) ;;
+                          *) echo "::error::$w is not tagged pyemscripten_2026_0_wasm32"; exit 1 ;;
                       esac
                       unzip -l "$w" | grep 'perspective/widget/static/perspective-anywidget.js' \
                           || { echo "::error::$w is missing the anywidget JS bundle"; exit 1; }
@@ -605,7 +605,7 @@ jobs:
                 arch:
                     - x86_64
                 python-version:
-                    - "3.13"
+                    - "3.14"
                 node-version: [22.x]
         steps:
             - name: Checkout
@@ -1240,7 +1240,7 @@ jobs:
 
             - uses: actions/download-artifact@v4
               with:
-                  name: perspective-python-dist-wasm32-emscripten-3.13
+                  name: perspective-python-dist-wasm32-emscripten-3.14
 
             - uses: actions/download-artifact@v4
               with:

DEVELOPMENT.md

@@ -168,7 +168,8 @@ this within a virtual environment.
 
 To build for [Pyodide](https://pyodide.org/), select
 `perspective-python (pyodide)` in `pnpm run setup` and install the pinned
-Pyodide distribution with `pnpm run install_pyodide`.
+Pyodide distribution with `pnpm run install_pyodide`. Pyodide builds use the
+separate `pyodide_emscripten` version pinned in `package.json`.
 
 ### `perspective-jupyterlab`
 

package.json

@@ -14,9 +14,10 @@
     },
     "type": "module",
     "emscripten": "4.0.9",
+    "pyodide_emscripten": "5.0.3",
     "binaryen": "version_132",
     "llvm": "17.0.6",
-    "pyodide": "0.29.4",
+    "pyodide": "314.0.7",
     "engines": {
         "node": ">=16 <27"
     },

rust/perspective-python/build.mjs

@@ -32,7 +32,7 @@ if (!!process.env.PSP_DEBUG) {
 const is_pyodide = !!process.env.PSP_PYODIDE;
 
 const python_version =
-    process.env.PSP_PYTHON_VERSION || (is_pyodide ? "3.13" : "3.12");
+    process.env.PSP_PYTHON_VERSION || (is_pyodide ? "3.14" : "3.12");
 
 const version = pkg.version;
 
@@ -45,12 +45,12 @@ const env = { ...process.env };
 let emsdk_prefix = "";
 if (is_pyodide) {
     const emsdkdir = path.resolve(__dirname, "../../.emsdk");
-    const { emscripten } = JSON.parse(
+    const { pyodide_emscripten } = JSON.parse(
         fs.readFileSync(path.resolve(__dirname, "../../package.json")),
     );
-    emsdk_prefix = `cd ${emsdkdir} && . ./emsdk_env.sh && ./emsdk activate ${emscripten} && cd ${cwd} && `;
+    emsdk_prefix = `cd ${emsdkdir} && . ./emsdk_env.sh && ./emsdk activate ${pyodide_emscripten} && cd ${cwd} && `;
     env.MATURIN_PYEMSCRIPTEN_PLATFORM_VERSION =
-        process.env.MATURIN_PYEMSCRIPTEN_PLATFORM_VERSION || "2025_0";
+        process.env.MATURIN_PYEMSCRIPTEN_PLATFORM_VERSION || "2026_0";
 }
 
 // if not windows

rust/perspective-python/pyproject.toml

@@ -55,6 +55,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Framework :: Jupyter",
     "Framework :: Jupyter :: JupyterLab",
     "Framework :: Jupyter :: JupyterLab :: 3",

rust/perspective-server/cpp/perspective/CMakeLists.txt

@@ -369,7 +369,7 @@ endif()
 set(RAPIDJSON_BUILD_TESTS OFF CACHE BOOL "Disable rapidjson tests")
 
 if(PSP_PYODIDE)
-    set(RELOCATABLE_FLAGS " -sRELOCATABLE=1 -sSIDE_MODULE=2 -fwasm-exceptions -sSUPPORT_LONGJMP=wasm \ ")
+    set(RELOCATABLE_FLAGS " -sSIDE_MODULE=2 -fwasm-exceptions -sSUPPORT_LONGJMP=wasm \ ")
     string(APPEND CMAKE_EXE_LINKER_FLAGS "${RELOCATABLE_FLAGS} -sWASM_BIGINT=1 ")
     string(APPEND CMAKE_C_FLAGS "${RELOCATABLE_FLAGS}")
     string(APPEND CMAKE_CXX_FLAGS "${RELOCATABLE_FLAGS}")

tools/scripts/install_emsdk.mjs

@@ -20,7 +20,9 @@ import "zx/globals";
 
 const pkg = getWorkspacePackageJson();
 
-const emscripten = pkg.emscripten;
+const emscripten = process.env.PSP_PYODIDE
+    ? pkg.pyodide_emscripten
+    : pkg.emscripten;
 
 dotenv.config({ path: "./.perspectiverc", quiet: true });
 

tools/scripts/workspace.mjs

@@ -42,7 +42,7 @@ export function getRustWheelsDir() {
 
 export function getEmscriptenWheelPath() {
     const pspVersion = getWorkspacePackageJson().version.replace("-", ".");
-    const wheeljunk = "cp311-abi3-pyemscripten_2025_0_wasm32";
+    const wheeljunk = "cp311-abi3-pyemscripten_2026_0_wasm32";
     return path.join(
         rustWheelsDir,
         `perspective_python-${pspVersion}-${wheeljunk}.whl`,