Why would Webpack 2 Ahead-Of-Time compilation not include the Map class?

Question

I've been converting a Webpack 1 application to version 2, mostly for the benefits of AOT compilation and tree-shaking. At present, the code compiles - but when I test it, the application crashes out because the Map class and its constructor can't be found. Since many modules make use of x = new Map() constructs, this is cramping my style.

Can anyone suggest why such a basic class wouldn't be included in the AOT build, please?

score 0 · Answer 1 · answered Mar 13 '17 at 20:27

0

Map is a JavaScript built-in data structure, which has been added with ES6/ES2015. You're probably using a browser that doesn't support it (see Browser compatibility). If you want to make it available for browsers that don't support it natively, you have to include a polyfill such as Map from core-js.

answered Mar 13 '17 at 20:27

Michael Jungo

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I'm using an up-to-date browser and core-js is already in my package.json file. Hence the mystery. – Grizzled Mar 15 '17 at 07:36

Why would Webpack 2 Ahead-Of-Time compilation not include the Map class?

1 Answers1