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Adding support for NodeNext, Node16, .cts, .mts, .cjs, .mjs

This feature has already been implemented. Here are my notes from when I was doing the work

TODOs

Implement node module type classifier:

  • if NodeNext or Node12: ask classifier for CJS or ESM determination Add ForceNodeNextCJSEmit

Does our code check for .d.ts extensions anywhere?

  • if so, teach it about .d.cts and .d.mts

For nodenext and node12, support supplemental "flavor" information:

Think about splitting out index.ts further:

  • register.ts - hooking stuff
  • types.ts
  • env.ts - env vars and global registration types (process.symbol)
  • service.ts

TESTS

Matrix:

  • package.json type absent, commonjs, and module
  • import and require
  • from cjs and esm
  • .cts, .cjs
  • .mts, .mjs
  • typechecking, transpileOnly, and swc
  • dynamic import
  • import = require
  • static import
  • allowJs on and off

Notes about specific matrix entries:

  • require mjs, mts from cjs throws error

Rethink: getOutput: null in transpile-only mode. Also may return emitskipped getOutputTranspileOnly: configured module option getOutputForceCommonJS: commonjs module option getOutputForceNodeCommonJS: nodenext cjs module option getOutputForceESM: esnext module option

Add second layer of classification to classifier: if classifier returns auto (no moduleType override)

  • if getOutput emits, done
  • else call nodeModuleTypeClassifier
    • delegate to appropriate getOutput based on its response