Writes the Custom Elements Manifest (Noizu.Tessera.Codegen.cem/1,
schemaVersion "1.0.0") for a tessera component package:
mix tessera.cem
mix tessera.cem --package PersonaKit
mix tessera.cem --output priv/static/custom-elements.jsonWith no --package, aggregates every package declared in the CURRENT
project (use Noizu.Tessera.Package); --package Module scopes to one.
This is the package-scoped sibling of mix tessera.manifest (which
aggregates across all loaded apps and also writes tessera-manifest.json)
— both derive from the same __tessera_spec__/0 / Codegen.cem/1
infrastructure, never a parallel registry.
The manifest is what the built-in gallery reads (mix tessera.gen.gallery).
Compiles the project first, so it is safe to run on a fresh checkout.