Features

• x9_root - this can be implemented as a macro

Plan

• Analyze file and add markers
• Instrumentation
• Wrap top-level class declarations in IIFEs so static props and decorators don't break down tree-shaking.
  • Must run before: TreeShaking
• Make top-level declarations lazy
  • This transform doesn't "add" or "remove" anything.
  • Must run after:
    • Spread operators

Transformers

• removeUnusedTopLevelBlocks(focusedBlock?: Location)
  • searches for top level blocks (test, playground)
• replacePrevalExpressionsWithPlaceholders()
• replaceSolvedPrevalExpressionsWithOutputAST()
• instrumentTopLevelTestBlocks()
• instrument()
  • instruments console.log
  • instrument //?
  • instrument expressions in block playgrounds
• insertConvertCalls
  • needs Program
  • replaces x9.convert<A>(b) with call to conversion function (if any)
• removeDeadCode()
  • we should do this often because we don’t want to run more macros than we need to

Bundling for slices

• for “slice” builds (run playground, tests, etc) use esbuild with an esbuild plugin, from the plugin we can call ts-transformers