chore: re-write existing-browser to typescript #1061
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What's done
A reminder on why unit tests need fixing after migrating to TS: since we are using SWC, it transforms modules into non-editable getters, which cannot be stubbed in a
sinon.stub(module, "method")
manner. The only way to stub such modules is via proxyquire. In the future we'll migrate to vitest which has more advanced&convenient ways of doing this.