Apply when connecting React components to Store Framework blocks and render-runtime behavior in VTEX IO. Covers interfaces.json, block registration, block composition, and how storefront components become configurable theme blocks. Use for block mapping, theme integration, or reviewing whether a React component is correctly exposed to Store Framework.
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Apply when connecting React components to Store Framework blocks and render-runtime behavior in VTEX IO. Covers interfaces.json, block registration, block composition, and how storefront components become configurable theme blocks. Use for block mapping, theme integration, or reviewing whether a React component is correctly exposed to Store Framework.
Render Runtime & Block Registration
When this skill applies
Use this skill when a VTEX IO storefront component needs to be exposed to Store Framework as a block.
Registering components in store/interfaces.json
Mapping block names to React components
Defining block composition and allowed children
Reviewing whether a component is correctly wired into theme JSON
Do not use this skill for:
shopper-facing component internals
admin interfaces
backend service or route design
policy modeling
Decision rules
Every block visible to Store Framework must be registered in store/interfaces.json.
Keep block names, component mapping, and composition explicit.
The block ID used as the key in store/interfaces.json, for example product-reviews, is the same ID that storefront themes reference under blocks in store/*.json.
The component field should map to the React entry name under react/, such as ProductReviews, or a nested path such as product/ProductReviews when the app structure is hierarchical.
Use composition intentionally when the block needs an explicit child model. children means the component renders nested blocks through , while means the block exposes named block slots controlled by Store Framework.
props.children
blocks
composition is optional. For many simple blocks, declaring component and, when needed, allowed is enough.
Block IDs are scoped by the declaring app's MAJOR version. vtex.pages-graphql resolves a block reference such as acme-related-products against acme.product-widgets@MAJOR.x:acme-related-products for the major actually installed in the workspace. A block declared in 0.x is not the same block as one declared in 5.x, even if the ID is identical.
A consumer theme that references a block ID through store/blocks.json only sees the block if the declaring app is installed at a major matching the dependency range. Mismatches surface as Missing block vendor.app@MAJOR.x:block-id errors at the resolver and break the page.
Use this skill for the render/runtime contract, and use storefront/admin skills for the component implementation itself.
Hard constraints
Constraint: Storefront blocks must be declared in interfaces.json
Every React component intended for Store Framework use MUST have a corresponding interfaces.json entry.
Why this matters
Without the interface declaration, the component cannot be referenced from theme JSON.
Detection
If a storefront React component is intended to be used as a block but has no matching interface entry, STOP and add it first.
Constraint: Block IDs must resolve under the installed major of the declaring app
Block IDs referenced from a theme app's store/blocks.json MUST resolve to an interfaces.json entry in an installed app whose MAJOR version matches the consumer's dependency range. The render-time resolver is keyed by vendor.app@MAJOR.x:block-id, not by the bare block ID.
Why this matters
vtex.pages-graphql uses the declaring app's major version as part of the block lookup. A block that exists in acme.product-widgets@0.x is not visible to a consumer that resolves acme.product-widgets@5.x, even if the block ID is identical. Mismatches return Missing block errors at the GraphQL layer and the page falls back to default content or fails outright.
Detection
If a consumer theme references a block ID and the declaring app's installed major does not match the consumer's dependency range, STOP and align the dependency range or move the block declaration to the correct major.
// consumer theme depends on acme.product-widgets@0.x// but the block "acme-related-products" was added in @5.x and never backported{"store.product":{"children":["acme-related-products"]}}
The resolver returns Missing block acme.product-widgets@0.x:acme-related-products.
Constraint: Block composition must be intentional
Composition and allowed child blocks MUST match the component's actual layout and runtime expectations.
Why this matters
Incorrect composition contracts make theme usage brittle and confusing.
Detection
If allowed or composition do not reflect how the component is supposed to receive children, STOP and correct the block contract.
This wiring makes the block name visible in the theme, maps it to a real React entry, and keeps composition rules explicit at the render-runtime boundary.
Common failure modes
Forgetting to register a storefront component as a block.
Mapping block names to missing React entry files.
Using the wrong composition model.
Adding a new block to a 5.x line and assuming consumers depending on 0.x will see it. Block visibility is scoped by the declaring app's installed major.
Renaming a block ID without coordinating with consumer themes that already reference it; the rename is effectively a breaking change for stored content.
Review checklist
Is the block declared in interfaces.json?
Does the component mapping resolve correctly?
Are composition and allowed children intentional?
Is runtime registration clearly separated from component internals?
Is the declaring app installed at a major that matches every consumer's dependency range?
Related skills
vtex-io-storefront-theme-app — Use when the question is how a consumer theme composes these blocks into pages and routes.
vtex-io-storefront-theme-versioning — Use when the question is how a major version change in a block-declaring app affects merchants who already reference those blocks in stored content.
