Set "type" to "module" in package.json

[vikerman]

Description

• Who wants the functionality
  Those loading lit-element in Node >=13 while doing SSR

• What it is they want
  Load lit-element as ES Modules without converting to CJS.

• Why they want it
  This lets toolchain to load lit based project as ES Modules so that they can run in Node without using bundling tools.

Acceptance criteria

What the card must do in order to accept it as complete. Acceptance Criteria must be concrete or measurable.
Create a release after changing "type": "module" in package.json

[zandaqo]

Either this, or have explicit CJS export as "main". Currently, Node attempts to load it as CJS but encounters "import/export" syntax and breaks.

A practical use case: Jest as of version 25.2 supports ES Modules (without Babel) and work fabulously for me, except for importing these webpack-oriented packages that are seen as CJS in Node's eyes but are ES Modules in reality.