aidd-namespace

name	aidd-namespace
description	Ensures types and related functions are authored and consumed in a modular, discoverable, tree-shakeable pattern. Use when creating types, refactoring type folders, defining schemas, importing types, or when the user mentions type namespaces, constants, or Schema.ToType.

Type namespace pattern

Single import surface per type: <type-name>/<type-name>.ts. Each constant or function lives in <exported-name>.ts; namespace re-export from public.js. Types live in the types/ layer per structure.

Precedence: This skill defines the canonical pattern. Existing files may not yet follow it; all new work and changes must conform. Do not copy legacy structure when adding or editing code.

File naming (utilities and constants)

Inside a type folder, name each file after the single export it provides. The folder already identifies the type, so no type prefix in the filename.

NamespaceFileNaming {
  typeEntry: "<type-name>.ts — type alias and namespace re-export"
  utilityOrConstant: "<exported-name>.ts — one file per exported function or constant; filename = export name"
}

Constraints {
  Do not use <type-name>-<exported-name>.ts for children; <exported-name>.ts is sufficient
}

Example: under types/point/, files length.ts, add.ts, and normalize.ts each export the like-named function.

Constant types

ConstantVisibility {
  private: "Single-file only, not exported"
  exported: "Sole export from eponymous file"
  public: "Re-exported from public.ts"
  internal: "Exported, not in public.ts"
}

Constraints

Constraints {
  "<type-name>/<type-name>.ts" is the only public import surface
  Export a single type alias: "export type <type-name> = <type>"
  Export namespace: "export * as <type-name> from \"./public.js\""
  In public.ts re-export every public constant file
  Child files: <exported-name>.ts (one export per file; filename matches export)
}

Consumers

Consumers {
  never: [
    "Import from public.js outside the type namespace folder",
    "Import from any child file (e.g. schema.js, length.js) outside the type namespace folder"
  ]
  do: [
    "import from <type-name>.ts only; e.g. Volume from \"../../types/volume/volume.js\"",
    "Access constants via the namespace: TypeName.length, etc."
  ]
}

Extending external types

When authoring helper functions for external types (e.g. String), use StringX as the discoverable extension namespace name.

Type derived from schema

Only for types whose source of truth is a schema. Most types do not; use a normal type alias. When the type is schema-backed, either derive it from the schema or keep a hand-written alias (e.g. for better JSDoc) and assert it matches the schema at compile time.

Option A — derive from schema:

src/types/player-mark/schema.ts

export const schema = { enum: ["X", "O"] } as const;

src/types/player-mark/public.ts

export { schema } from "./schema.js";

src/types/player-mark/player-mark.ts

import { Schema } from "@adobe/data/schema";
import { schema } from "./schema.js";
export type PlayerMark = Schema.ToType<typeof schema>;
export * as PlayerMark from "./public.js";

Option B — hand-written object type with compile-time assertion: Use when you want property-level JSDoc. From @adobe/data/types, use Assert<Equal<YourType, Schema.ToType<typeof schema>>> so the type stays in sync with the schema.

import { Assert, Equal } from "@adobe/data/types";
import { Schema } from "@adobe/data/schema";
import { schema } from "./schema.js";

export type Bounds = {
  /** Left edge in world units. */
  x: number;
  /** Top edge in world units. */
  y: number;
  /** Width in world units. */
  width: number;
  /** Height in world units. */
  height: number;
};

type _CheckSameType = Assert<Equal<Bounds, Schema.ToType<typeof schema>>>;

export * as Bounds from "./public.js";

Testing

Constraints {
  Give each function file its own <same-name>.test.ts unit test
}

Execute

fn whenRefactoringToNamespace() {
  Constraints {
    Identify constants in the current file
    Extract them into the standard pattern
    Identify all consumers of public namespaces
    Check each consumer: imports use <type-name>.ts only, never public.js or individual child files
    Ensure unit tests exist per function file, splitting as needed
  }
}