DERIVED VALUES

Expose every text and number context value once, with its plain type: dataType: 'text' (typed Text) or dataType: 'number' (typed NumberType). Do not add a richText twin — no richTextCount, no toRichText() helper — for a value that already exists as text or number.

The binding panel converts types for you. The platform’s data-type conversion library supplies text → richText, number → richText, and number → text, so a plain text or number item already binds straight to the content of Wix’s built-in text elements. A twin only duplicates the item in the binding panel and the manifest, leaving two candidates for the same binding.

Register each value once in context.items:

Use dataType: 'richText' only when the value itself carries formatting that plain text would lose — for example, fetched HTML content. Expose that RichText value on its own, not alongside a plain twin.

ContextItems do not accept a richText abilities config (the ContextItem schema has no such field) — abilities belong only on data items. When the provider accepts a richText value as a data configuration prop (not a context item), the richText config and defaultValue fields apply — see RichText Type in CONTEXT_PROVIDER_SPEC.md for both.

Derived Values (Mandatory)

Design every provider for binding-only consumers — an element wired via Editor Binding, or an automated markup generator that consumes the provider manifest. Every consumer bound in the Editor is one, and binding is the default for this app’s consumers. A binding wires one context item straight through to one element prop or event handler; there is no expression layer between them. The platform converts types (see Plain Values, Not RichText Twins) but nothing else, so the consumer cannot evaluate count >= 10 && <Banner/> itself:

Every condition in the request must already exist as its own context item, resolved to exactly the value the element consumes. Leaving one unresolved does not fail loudly: with no way to negate, the consumer wires the element to a value it was given rather than the one it needed, so a banner meant to appear at count >= 10 shows while the count is below 10. Rules:

1. Match the target property’s polarity. Expose one booleanValue per gated property, set to true exactly when that property should apply. For EML visibility modes, use names such as isCongratsBannerHidden or isEmptyCartMessageCollapsed because hidden, collapsed, and removed apply when their binding is true.
2. Only expose the opposite polarity when another binding needs it. If two elements are gated on opposite sides of one condition, expose a ready-to-bind value for each target property. When the condition comes from fetched data, the complement must also require that the data arrived. A failed fetch collapses to the same empty value as a successful empty result, so count === 0 on its own is true during an outage — and an item named for the reassuring side of the condition then shows reassurance over a broken page. See The Loading Pair Is Mandatory.
3. Raw state never stands in for a condition. count is a display value; it is not isCongratsBannerHidden. Expose both — the first for the text element, the second for the gate.
4. Pre-format state-dependent text. Any string that varies with state ships fully assembled from the provider — statusMessage, not the pieces for a consumer to interpolate.
5. Derive at render time from the state. Compute derived values in the provider body from the state value itself. Never hold a second piece of state for a derived value — it drifts out of sync with its source.
6. Any provider that awaits a promise exposes isPlaceholderHidden and isContentHidden. Both as booleanValue items, whether or not the request mentions loading — and unlike rule 2’s pairs these two are independent, not complements: during a refetch both are false (content stays visible and the loading visual shows). See The Loading Pair Is Mandatory.

Both booleans are ordinary dataType: 'booleanValue' entries in context.items. For the full provider and registration, see Counter with a goal-gated banner.