Code split modern vs. legacy

[michielmetcake]

Why do the types main and module point to the build/legacy folder and the exports to the build/modern folder?

I find it confusing when I lookup the type definitions.

  "types": "build/legacy/index.d.ts",
  "main": "build/legacy/index.cjs",
  "module": "build/legacy/index.js",
  "exports": {
    ".": {
      "import": {
        "types": "./build/modern/index.d.ts",
        "default": "./build/modern/index.js"
      },
      "require": {
        "types": "./build/modern/index.d.cts",
        "default": "./build/modern/index.cjs"
      }
    },
    "./package.json": "./package.json"
  },

[TkDodo]

we make a legacy build specifically for webpack4 I think.