build: move cleanupNodeModules to its own file

this is necessary, since for Docker and electron-forge, we need to run this as an extra step after copy-dist

for electron-forge: after it is done with its own "pruning", as we otherwise would need to also take care of certain electron related pruning

for Docker: as a last step in the build stage

bin/cleanupNodeModules.ts

@@ -0,0 +1,87 @@
+import fs from "fs-extra";
+import path from "path";
+
+function main() {
+    if (process.argv.length !== 3) {
+        console.error("More than one path was supplied as argument. Aborting.");
+        process.exit(1);
+    }
+
+    const basePath = process.argv[2];
+
+    if (!fs.existsSync(basePath)) {
+        console.error(`Supplied path '${basePath}' does not exist. Aborting.`)
+        process.exit(1);
+    }
+
+    cleanupNodeModules(basePath);
+}
+
+function cleanupNodeModules(basePath: string) {
+    const nodeDir = fs.readdirSync(path.join(basePath, "./node_modules"), { recursive: true, withFileTypes: true });
+    //const libDir = fs.readdirSync(path.join(basePath, "./libraries"), { recursive: true, withFileTypes: true });
+
+    /**
+     * Delete unnecessary folders
+     */
+    const filterableDirs = new Set([
+        "demo",
+        "demos",
+        "doc",
+        "docs",
+        "example",
+        "examples",
+        "test",
+        "tests"
+    ]);
+
+    nodeDir
+        .filter(el => el.isDirectory() && filterableDirs.has(el.name))
+        .forEach(dir => fs.removeSync(path.join(dir.parentPath, dir.name)));
+
+
+    /**
+     * Delete unnecessary files based on file extension
+     * TODO filter out useless (README).md files
+     */
+    const filterableFileExt = new Set([
+        "ts",
+        "map"
+    ]);
+
+    nodeDir
+        // TriliumNextTODO: check if we can improve this naive file ext matching, without introducing any additional dependency
+        .filter(el => el.isFile() && filterableFileExt.has(el.name.split(".").at(-1) || ""))
+        .forEach(file => fs.removeSync(path.join(file.parentPath, file.name)));
+
+
+    /**
+     * Delete specific unnecessary folders
+     * TODO: use basePath
+     * TODO: check if we want removeSync to throw an error, if path does not exist anymore -> currently it will silently fail
+     */
+    const extraFoldersDelete = new Set([
+        'build/node_modules/@excalidraw/excalidraw/dist/dev',
+        'build/node_modules/boxicons/svg',
+        'build/node_modules/boxicons/node_modules',
+        'build/node_modules/boxicons/src',
+        'build/node_modules/boxicons/iconjar',
+        'build/node_modules/@jimp/plugin-print/fonts',
+        'build/node_modules/jimp/dist/browser'
+        // "node_modules/@excalidraw/excalidraw/dist/dev",
+        // "node_modules/jimp/browser",
+        // "node_modules/@jimp/plugin-print/fonts",
+        // "node_modules/jimp/dist/browser",
+        // "node_modules/jimp/fonts",
+        // "node_modules/boxicons/svg",
+        // "node_modules/boxicons/node_modules/react",
+        // "node_modules/mermaid/dist/mermaid.js"
+    ]);
+
+    nodeDir
+        .filter(el => el.isDirectory() && extraFoldersDelete.has(path.join(el.parentPath, el.name)))
+        .forEach(dir => fs.removeSync(path.join(dir.parentPath, dir.name)))
+
+}
+
+main()