polyfill: add js extension to main file in package.json

w3c / IntersectionObserver

Intersection Observer

https://www.w3.org/TR/intersection-observer/

Other

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Closed miketaylr closed 2 years ago

miketaylr commented 2 years ago

Fixes #399

miketaylr commented 2 years ago

PTAL @szager-chromium

philipwalton commented 2 years ago

Gah, should have suggested you bump the version before I merged. See #497.

miketaylr commented 2 years ago

All good - let's merge that real quick.