Make sure to provide side effects free bundle

[weblogixx]

It should be checked if it is possible to provide a side effects free package by adding hints for bundlers (e.g. webpack) that make it possible to better tree shake the package.

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Proposed solution:

• Get a list of all files that have side effects (e.g. https://github.com/SICKAG/collage/blob/main/src/elements/fragment-element.ts#L84)
• Add an entry sideEffects with a list of all files containing such effects

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Further Information:

• https://github.com/SICKAG/collage/blob/main/src/elements/fragment-element.ts#L84
• https://sgom.es/posts/2020-06-15-everything-you-never-wanted-to-know-about-side-effects/

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If this feature is considered, I would be happy to provide a pull request for this feature.

[WanjaTschuorSICKAG]

Hey @weblogixx

I would be happy to geht a pullrequest in that issue, if youbare still interested.