webpack: add hack to remove unused icons

This follows the suggestions from [1] to reduce the package size by
only including the icons we are actually using. This gets the main
module small enough to avoid the CRA "The bundle size is significantly
larger than recommended." warning (gzipped size is < 512KB).

[1]: https://github.com/palantir/blueprint/issues/2193

config/webpack.config.js

@@ -586,6 +586,10 @@ module.exports = function (webpackEnv) {
       ].filter(Boolean),
     },
     plugins: [
+      // https://github.com/palantir/blueprint/issues/2193
+      new webpack.NormalModuleReplacementPlugin(
+        /.*\/@blueprintjs\/icons\/lib\/esm\/iconSvgPaths.*/,
+        path.resolve(__dirname, "../src/blueprintjs-icons.js")),
       new CopyPlugin({
         patterns: [
           {

src/blueprintjs-icons.js

@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2022 The Pybricks Authors
+
+// HACK: Prevent webpack from picking up all icons.
+// https://github.com/palantir/blueprint/issues/2193
+
+import {
+    Add,
+    Archive,
+    Blank,
+    Chat,
+    ChevronDown,
+    ChevronRight,
+    Clipboard,
+    Code,
+    Cog,
+    Cross,
+    Disable,
+    Document,
+    Download,
+    Duplicate,
+    Edit,
+    Error,
+    Export,
+    Help,
+    Import,
+    InfoSign,
+    Lightbulb,
+    Play,
+    Plus,
+    Redo,
+    Refresh,
+    Share,
+    Tick,
+    TickCircle,
+    Trash,
+    Undo,
+    Virus,
+} from '@blueprintjs/icons/lib/esm/generated/16px/paths';
+import {
+    Cog as Cog20,
+    Document as Document20,
+} from '@blueprintjs/icons/lib/esm/generated/20px/paths';
+import { pascalCase } from 'change-case';
+
+export function iconNameToPathsRecordKey(name) {
+    return pascalCase(name);
+}
+
+export const IconSvgPaths16 = {
+    Add,
+    Archive,
+    Blank,
+    Chat,
+    ChevronDown,
+    ChevronRight,
+    Clipboard,
+    Code,
+    Cog,
+    Cross,
+    Disable,
+    Document,
+    Download,
+    Duplicate,
+    Edit,
+    Error,
+    Export,
+    Help,
+    Import,
+    InfoSign,
+    Lightbulb,
+    Play,
+    Plus,
+    Redo,
+    Refresh,
+    Share,
+    Tick,
+    TickCircle,
+    Trash,
+    Undo,
+    Virus,
+};
+
+export const IconSvgPaths20 = { Cog: Cog20, Document: Document20 };