build: enable mangling of privates

Author: Danielku15

packages/alphatab/vite.config.ts

@@ -85,7 +85,7 @@ export default defineConfig(({ mode }) => {
             lib.entry['alphaTab.core'] = path.resolve(__dirname, 'src/alphaTab.core.ts');
             lib.entry['alphaTab.worker'] = path.resolve(__dirname, 'src/alphaTab.worker.ts');
             lib.entry['alphaTab.worklet'] = path.resolve(__dirname, 'src/alphaTab.worklet.ts');
-
+            
             for (const output of config.build!.rollupOptions!.output as OutputOptions[]) {
                 const isMin = (output.entryFileNames as string).includes('.min');
                 (output.plugins as Plugin[]).push(adjustScriptPathsPlugin(isMin));

packages/tooling/src/vite.plugin.dts.ts

@@ -26,7 +26,8 @@ export default function generateDts(root: string, entryFile: string, outputFilen
             },
             dtsRollup: {
                 enabled: true,
-                publicTrimmedFilePath: outputFile
+                publicTrimmedFilePath: outputFile,
+                omitTrimmingComments: true
             }
         }
     });

packages/tooling/src/vite.ts

@@ -1,14 +1,22 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import url from 'node:url';
-import terser from '@rollup/plugin-terser';
+import terser, {type Options as TerserOptions } from '@rollup/plugin-terser';
 import typescript, { type RollupTypescriptOptions } from '@rollup/plugin-typescript';
 import type { OutputChunk, OutputOptions } from 'rollup';
 import license from 'rollup-plugin-license';
 import ts from 'typescript';
 import type { LibraryOptions, UserConfig } from 'vite';
 import generateDts from './vite.plugin.dts.ts';
 
+const terserOptions: TerserOptions = {
+    mangle: {
+        properties: {
+            regex: /^_/
+        }
+    }  
+};
+
 const __dirname = url.fileURLToPath(new URL('.', import.meta.url));
 
 let repositoryRoot = __dirname;
@@ -128,7 +136,7 @@ export function umd(
             dir: 'dist/',
             format: 'umd',
             name: name,
-            plugins: [terser()],
+            plugins: [terser(terserOptions)],
             entryFileNames: '[name].min.js',
             chunkFileNames: '[name].min.js'
         });
@@ -213,15 +221,15 @@ export function esm(
             },
             dir: 'dist/',
             format: 'es',
-            plugins: [terser()],
+            plugins: [terser(terserOptions)],
             entryFileNames: '[name].min.mjs',
             chunkFileNames: '[name].min.mjs'
         });
     }
 }
 
 export function dtsPathsTransformer(mapping: Record<string, string>) {
-    const mapPath = (filePath, input: string): string | undefined => {
+    const mapPath = (filePath:string, input: string): string | undefined => {
         for (const [k, v] of Object.entries(mapping)) {
             if (input.startsWith(k)) {
                 const absoluteFile = path.resolve(v, input.substring(k.length));
@@ -233,7 +241,7 @@ export function dtsPathsTransformer(mapping: Record<string, string>) {
 
     return (context: ts.TransformationContext) => {
         return (source: ts.SourceFile | ts.Bundle) => {
-            const sourceFilePath = ts.isSourceFile(source) ? source.fileName : source.sourceFiles[0];
+            const sourceFilePath = ts.isSourceFile(source) ? source.fileName : source.sourceFiles[0].fileName;
 
             const visitor = (node: ts.Node) => {
                 if (ts.isExportDeclaration(node) && node.moduleSpecifier && ts.isStringLiteral(node.moduleSpecifier)) {