gulp-jspm-build
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Cannot see ES6 src files in debugger with bundles
Chrome DevTools cannot see the original ES6 src files using bundles built by gulp-jspm-build
The app-bundle.js generated by gulp-jspm-build has sourceMappingURL mispelled with lowercase "Url" like this,
//# sourceMappingUrl=app-bundle.js.map
It should be all caps "URL" like this:
//# sourceMappingURL=app-bundle.js.map
After changing to uppercase URL, then DevTools sees the ES6 source.