CJS to ESM

[na9da]

What this PR does

Convert CJS modules to ESM.

Required for #6998 Depends on: https://github.com/terriajs/terriamap/tree/cjs-to-esm

TODO:

• [ ] Test node build

What this PR does:

• Removes stale CJS files that are no longer used (https://github.com/TerriaJS/terriajs/pull/7311/commits/395d3b98bc471d54c562f26cb45baa37782fea6b)
• Convert CJS style module.exports to ESM style export default ... (https://github.com/TerriaJS/terriajs/pull/7311/commits/7129b240e71f3acaa8fbed7bfcfdcd69b0f4026c)

• Convert CJS require() to ESM import statements. (https://github.com/TerriaJS/terriajs/pull/7311/commits/30654f1a33b1af79afe5843b99855d67cc3c3667) This requires, in some places:

  • simply swapping require with import
  • creating a stub .d.ts module definition in lib/ThirdParty
  • updating the library to get new bundled type definitions
    • file-saver
    • react-responsive

  • or adding @types/x as dependency

    • @types/proj4

    Remaining require() imports are all for static assets or web workers which can be fixed when upgrading to webpack 5.

• Remove use strict declaration for .tsx? files.

Test me

Test http://ci.terria.io/cjs-to-esm

Checklist

• [ ] There are unit tests to verify my changes are correct or unit tests aren't applicable (if so, write quick reason why unit tests don't exist)
• [ ] I've updated relevant documentation in doc/.
• [ ] I've updated CHANGES.md with what I changed.
• [ ] I've provided instructions in the PR description on how to test this PR.