[mshima]

Summary

The 17 modules of src were mostly at its root, the store and the lookup importing each other, and a util importing the environment. They are organized by what they are about:

src/
  index.ts, constants.ts
  environment/  environment-base.ts, environment-full.ts, composed-store.ts, commit.ts, package-manager.ts, resolve.ts
  store/        store.ts (Store), lookup.ts, lookup-generator.ts, module-lookup.ts, namespace.ts, index.ts, public.ts
  cli/          index.ts (bin), utils.ts, command.ts, commands.ts
  util/         args.ts, exec.ts, object.ts, regexp.ts

• store/: the store is implemented in store.ts; index.ts only exports the store and its lookups to the other modules of the package, which import the folder by it; public.ts is the module of yeoman-environment/store (the store as Store and default, and its types), in place of src/store-export.ts. lookupGenerator, which uses a store, moves to lookup-generator.ts, so the lookup no longer imports the store.
• cli/: the modules of the cli create the environment from environment-full.ts, no longer importing the index that re-exports them.
• util/: util.ts split by subject.
• The modules finding the root of the package one folder deeper (the version of the environment, the npm paths next to it) are updated.

No module imports another at runtime in a cycle. The exports of the package are unchanged (the names exported by the index compared), yeoman-environment/store loads 33 modules (32 before, public.js added), and git follows the renames.

Supersedes #872.

Test plan

• npm test (eslint, prettier, tsc, the tests)
• npm run build, the bin (--version), the exports of the index, the modules of yeoman-environment/store

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