fix: disable tree-shaking via PURE annotations when compression is disabled

When building a library, "pure" comments are often added to various bits and pieces to ensure tree-shaking works properly in the destination bundle. Compression via terser will automatically drop these hints in some cases, so disabling compression serves the purpose of leaving total minification up to the destination bundler.

Author: quantizor

src/index.js

@@ -481,6 +481,7 @@ function createConfig(options, entry, format, writeMeta) {
 			},
 
 			treeshake: {
+				annotations: options.compress,
 				propertyReadSideEffects: false,
 			},