minifying - Note how to see what code tree shaking affects

Thanks Aluan!
survivejs · Jan 17, 2017 · e3287ec · e3287ec
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diff --git a/manuscript/01_introduction.md b/manuscript/01_introduction.md
@@ -94,4 +94,4 @@ The book wouldn't be half as good as it is without patient editing and feedback
 
 This book wouldn't have been possible without the original "SurviveJS - Webpack and React" effort. Anyone who contributed to that, deserves my thanks! You can check that book for more specific attributions.
 
-Thanks to Mike "Pomax" Kamermans, Cesar Andreu, Dan Palmer, Viktor Jančík, Tom Byrer, Christian Hettlage, David A. Lee, Alexandar Castaneda, Marcel Olszewski, Steve Schwartz, Chris Sanders, Charles Ju, Aditya Bhardwaj, Rasheed Bustamam, José Menor, Ben Gale, Jake Goulding, Andrew Ferk, gabo, Giang Nguyen, @Coaxial, @khronic, Henrik Raitasola, Gavin Orland, David Riccitelli, Stephen Wright, Majky Bašista, Artem Sapegin, Gunnari Auvinen, Jón Levy, Alexander Zaytsev, Richard Muller, Ava Mallory (Fiverr), Sun Zheng'an, Nancy (Fiverr), and many others who have contributed direct feedback for this book!
+Thanks to Mike "Pomax" Kamermans, Cesar Andreu, Dan Palmer, Viktor Jančík, Tom Byrer, Christian Hettlage, David A. Lee, Alexandar Castaneda, Marcel Olszewski, Steve Schwartz, Chris Sanders, Charles Ju, Aditya Bhardwaj, Rasheed Bustamam, José Menor, Ben Gale, Jake Goulding, Andrew Ferk, gabo, Giang Nguyen, @Coaxial, @khronic, Henrik Raitasola, Gavin Orland, David Riccitelli, Stephen Wright, Majky Bašista, Artem Sapegin, Gunnari Auvinen, Jón Levy, Alexander Zaytsev, Richard Muller, Ava Mallory (Fiverr), Sun Zheng'an, Nancy (Fiverr), Aluan Haddad, and many others who have contributed direct feedback for this book!
diff --git a/manuscript/optimizing_build/01_minifying.md b/manuscript/optimizing_build/01_minifying.md
@@ -172,6 +172,8 @@ If you build the project again (`npm run build`), the result should remain exact
 
 The same idea works with dependencies that use the ES6 module definition. Given the related packaging standards are still emerging, it is possible you may have to be careful when consuming such packages. Webpack will try to resolve *package.json* `module` field for this purpose. See the *Consuming Packages* chapter for related techniques.
 
+T> If you want to see which parts of the code tree shaking affects, enable warnings at the `UglifyJsPlugin`. In addition to other messages, you should see lines like `Dropping unused variable treeShakingDemo [./app/component.js:17,6]`.
+
 ## Controlling UglifyJS through Webpack
 
 An UglifyJS feature known as **mangling** will be enabled by default. The feature will reduce local function and variable names to a minimum, usually to a single character. It can also rewrite properties to a more compact format if configured specifically.