Stencil: ES5 Build error caused by checkIfURLIsSupported() in polyfills

[nj-coder]

While building my react which requires es5 varitant, using buildEs5: 'prod', the build using uglifyjs-webpack-plugin breaks with the below error

In strict mode code, functions can only be declared at top level or immediately within another function.

Stencil version:

 @stencil/[email protected]

I'm submitting a:
[x] bug report

Current behavior:
The es5 variation of stencil core build references the polyfill file which causes a build system for es5 to break dues to strict mode configurations

Expected behavior:
The app in which the stencil is integrated should build fine after including stencil.

Other information:
After some digging around, this is caused by checkIfURLIsSupported() in the polyfills/index.js file. This can be fixed by converting checkIfURLIsSupported as a function expression. I am happy to put a PR if this can be a fix that solves the issue without hurting any other setup.

[claviska]

That sounds like a good fix. Looking forward to the PR 😄

[nj-coder]

Thanks, its up here @claviska

[claviska]

Thanks, fixed in #2799.