Ensure we target ES5 when building in webpack, add browserslist #329
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Fixes #328
We recently upgraded from Webpack 4 -> 5. Webpack 5 introduced additional controls over code generation, specifically adding options in
output.environment. Since we target ES5 with our builds, and intentionally attempt to supper IE 11, we want all of the options turned off.This PR also adds a
.browserslistrcfile to ensure Webpack targets the browsers we care about. This was an additional change in the Webpack 4 -> 5 upgrade.