@codaco/shared-consts

Shared constants, runtime schemas, and TypeScript types used across Network Canvas.

Sparse entity attributes

NcEntity, NcNode, NcEdge, NcEgo, and NcNetwork expose a strict output contract: every own property in an entity's attributes record contains a defined VariableValue. A missing property is the only representation of an unset variable.

VariableValueSchema and VariableValue support strings, booleans, numbers, arrays of primitive values, encrypted number arrays, and { x, y } layout coordinates. They do not accept null or undefined. Defined empty values are data, not absence, so writers and normalizers must preserve all of these:

{
  optedIn: false,
  count: 0,
  note: '',
  selections: [],
}

Do not create placeholder properties for unanswered variables:

// Correct: `nickname` is unset.
const attributes = {};

// Incorrect output: nullish values are not VariableValue values.
const attributes = { nickname: null };

Input compatibility and strict output

Use NcNetworkSchema.parse(input) at persistence, synchronization, and other untrusted-data boundaries. Its input accepts null and undefined attribute entries, then omits those properties from every ego, node, and edge attribute record. It preserves false, 0, '', [], and defined attributes not declared by the current codebook.

The distinction between input and output is intentional:

const network: NcNetwork = NcNetworkSchema.parse(storedValue);
// network attributes are now Record<string, VariableValue>

Code that already has an NcNetwork must not write nullish values. Code that accepts stored or external data must parse it before exposing the public output types. StageMetadataSchema applies the same sparse normalization to Family Pedigree edge attribute snapshots.