Component & Variant API Patterns
Part of the use_figma skill. How to correctly use the Plugin API for components, variants, and component properties.
For design system context (when to use variants vs properties, code-to-Figma translation, property model), see wwds-components.
Contents
- Creating a Component
- Combining Components into a Component Set (Variants)
- Laying Out Variants After combineAsVariants (Required)
- Component Properties: addComponentProperty API
- Linking Properties to Child Nodes (Required)
- INSTANCE_SWAP: Avoiding Variant Explosion
- Discovering Existing Conventions in the File
- Importing Components by Key
- Working with Instances (finding variants, setProperties, text overrides, detachInstance)
Wrapper boundary
Use $fig for node creation. Its constructors and componentHandle.createInstance() alias return plan wrappers. done() does not convert them to raw nodes, and set.children remains an array of wrappers. Prefer $fig.instance(componentHandle, opts), .set(...), and wrapper .append(...) for creation and placement. The raw property-inspection examples below explicitly access .node after materializing; never omit that step. See fig-builder.md.
Creating a Component
$fig.component() returns a component wrapper. Use options or .set() to configure it. For the raw component-property examples below, materialize and explicitly access .node to get a ComponentNode.
const compPlan = $fig.component({
name: 'MyComponent', layoutMode: 'HORIZONTAL',
primaryAxisAlignItems: 'CENTER', counterAxisAlignItems: 'CENTER',
paddingLeft: 12, paddingRight: 12,
layoutSizingHorizontal: 'HUG', layoutSizingVertical: 'HUG',
fills: [{ type: 'SOLID', color: { r: 0.2, g: 0.36, b: 0.96 } }],
});
// Only needed if continuing with the raw component-property examples below:
await $fig.done();
const comp = compPlan.node;
if (!comp || comp.type !== 'COMPONENT') throw new Error('Expected a component');Combining Components into a Component Set (Variants)
$fig.variants(opts, components) groups component wrappers into a component-set wrapper. Use $fig.component(...) for each variant; frames are not valid variants.
Variant names use a Property=Value format. Every unique combination must exist as a child component — missing ones show as blank gaps in the variant picker.
// Each component's name encodes its variant properties
const comp1 = $fig.component({ name: "size=md, style=primary" });
const comp2 = $fig.component({ name: "size=md, style=secondary" });
const set = $fig.variants({ name: "Button" }, [comp1, comp2]);
// Select a variant through the set; no intermediate flush is required.
const preview = $fig.instance(set, { name: "Button preview", props: { size: "md", style: "primary" } });Before creating variants, inspect the file for existing naming patterns. Different files use different conventions (State=Default vs state=default vs State/Default). Always match what's already there.
Laying Out Variants After combineAsVariants (Required)
After $fig.variants materializes, all children stack at (0, 0). You must position them or the component set will appear as a single collapsed element with all variants overlapping.
// Continue from the set wrapper above. Flush to read measured sizes.
await $fig.done();
const cs = set.node; // cs.children contains raw ComponentNodes
// Simple row layout
cs.children.forEach((child, i) => {
child.x = i * 150;
child.y = 0;
});
// CRITICAL: resize the component set from actual child bounds
let maxX = 0, maxY = 0;
for (const child of cs.children) {
maxX = Math.max(maxX, child.x + child.width);
maxY = Math.max(maxY, child.y + child.height);
}
cs.resizeWithoutConstraints(maxX + 40, maxY + 40);For multi-axis variants (e.g., size × style × state), parse the child's name to determine grid position:
for (const child of cs.children) {
const props = Object.fromEntries(
child.name.split(', ').map(p => p.split('='))
);
const col = stateValues.indexOf(props.state);
const row = styleValues.indexOf(props.style);
child.x = col * colWidth;
child.y = row * rowHeight;
}Component Properties: addComponentProperty API
Building with
$fig? Prefer the builder methodslayer.textProp(name)/.booleanProp(name)/.instanceSwapProp(name)— they add the property to the (set-aware) component with the default inferred from the layer, de-dup across variants, and handle materialization timing for you. See fig-builder.md → Component properties. Use the rawaddComponentPropertyAPI below when you are not in a$figplan.
addComponentProperty adds a TEXT, BOOLEAN, or INSTANCE_SWAP property to a component. It returns a string key (e.g., "label#4:0") — never hardcode or guess this key.
// Returns the key as a string — capture it!
const labelKey = comp.addComponentProperty('Label', 'TEXT', 'Default text');
const showIconKey = comp.addComponentProperty('Show Icon', 'BOOLEAN', true);
const iconSlotKey = comp.addComponentProperty('Icon', 'INSTANCE_SWAP', iconComponentId);Timing: Add component properties to each variant component before calling combineAsVariants. After combining, the component set inherits all properties from its children. Do not add properties to the ComponentSetNode directly.
Linking Properties to Child Nodes (Required)
A property that is added but not linked to a child node does nothing. You must set componentPropertyReferences on the child:
// TEXT property → link to a text node's characters
const labelKey = comp.addComponentProperty('Label', 'TEXT', 'Button');
const textPlan = $fig.text({ characters: "Button" });
await $fig.done();
const textNode = textPlan.node;
comp.appendChild(textNode);
textNode.componentPropertyReferences = { characters: labelKey };
// BOOLEAN + INSTANCE_SWAP → link to an instance node
const showIconKey = comp.addComponentProperty('Show Icon', 'BOOLEAN', true);
const iconSlotKey = comp.addComponentProperty('Icon', 'INSTANCE_SWAP', iconComp.id);
const iconInstancePlan = $fig.instance(iconComp.id);
await $fig.done();
const iconInstance = iconInstancePlan.node; // raw node for componentPropertyReferences
comp.appendChild(iconInstance);
iconInstance.componentPropertyReferences = {
visible: showIconKey, // BOOLEAN controls show/hide
mainComponent: iconSlotKey // INSTANCE_SWAP controls which component
};Valid componentPropertyReferences keys:
characters— TEXT property on a TextNodevisible— BOOLEAN property (any node)mainComponent— INSTANCE_SWAP property on an InstanceNode
INSTANCE_SWAP: Avoiding Variant Explosion
When a component has many possible sub-elements (e.g., 30 different icons), never create a variant per sub-element. Use a single INSTANCE_SWAP property instead — the user picks from any compatible component at design time.
// Create icon as its own ComponentNode
const iconPlan = $fig.component({ name: "Icon/Search", width: 24, height: 24 }, [
$fig.svg('<svg>...</svg>'),
]);
await $fig.done();
const iconComp = iconPlan.node;
// Use it as the default for INSTANCE_SWAP
const iconSlotKey = comp.addComponentProperty('Icon', 'INSTANCE_SWAP', iconComp.id);
const instancePlan = $fig.instance(iconComp.id);
await $fig.done();
const instance = instancePlan.node; // raw node for componentPropertyReferences
comp.appendChild(instance);
instance.componentPropertyReferences = { mainComponent: iconSlotKey };This works for icons, avatars, badges, or any swappable nested element.
Discovering Existing Conventions in the File
Always inspect the file before creating components. Different files have different naming styles, structures, and conventions. Your code should match what's already there.
List all existing components across all pages
const results = [];
for (const page of figma.root.children) {
await figma.setCurrentPageAsync(page);
page.findAll(n => {
if (n.type === 'COMPONENT') results.push(`[${page.name}] ${n.name} (COMPONENT) id=${n.id}`);
if (n.type === 'COMPONENT_SET') results.push(`[${page.name}] ${n.name} (COMPONENT_SET) id=${n.id}`);
return false;
});
}
return results.join('\n');Inspect an existing component set's variant naming pattern
const cs = await figma.getNodeByIdAsync('COMPONENT_SET_ID');
if (!cs || cs.type !== 'COMPONENT_SET') {
throw new Error('Expected a component set');
}
const variantNames = cs.children.map(c => c.name);
const propDefs = cs.componentPropertyDefinitions;
return { variantNames, propDefs };Find existing components in the file
const components = [];
for (const page of figma.root.children) {
await figma.setCurrentPageAsync(page);
page.findAll(n => {
if (n.type === 'COMPONENT') {
components.push({ name: n.name, id: n.id, page: page.name, w: n.width, h: n.height });
}
return false;
});
}
return components;Using Components by Key (Team Libraries)
search_design_system returns componentKey for assetType: "component" and componentSetKey for assetType: "component_set". Pass it directly into $fig.get(...) / $fig.instance(...) — the plan queues the library import automatically, so no separate importComponentByKeyAsync call is needed.
// Instance a library component by its componentKey
$fig.instance(BUTTON_COMPONENT_KEY, { name: 'Submit' });
// Instance a specific variant of a component set by passing the set's
// componentSetKey + variant props
$fig.instance(BUTTON_SET_KEY, { props: { Size: 'md', Variant: 'primary' } });You do not need to import the component set, drill into compSet.children, or call defaultVariant.createInstance() yourself. $fig.instance(setKey, { props }) picks the matching variant by setProperties after the instance is created from the default variant — the same path used for variant switches on an existing instance via $fig.set(inst, { props }) or inst.setInstanceProps({...}).
Working with Instances
Selecting a variant in a component set
Pass the variant property values in props — $fig.instance resolves them on the underlying setProperties call:
$fig.instance(BUTTON_SET_KEY, {
props: { variant: 'primary', size: 'md' },
});Switching the variant of an existing instance
Use $fig.set / $fig.query(...).set({ props }) or planNode.setInstanceProps({...}). Both go through the same plan-managed setProperties path:
const instance = $fig.get('1:42') // an existing INSTANCE
instance.setInstanceProps({ variant: 'primary', size: 'medium' })
// Bulk: every matching instance on the page
$fig.query('INSTANCE[name=Button]').set({ props: { variant: 'primary' } })Overriding text in a component instance
Always discover component properties BEFORE writing text overrides. Components expose text as TEXT-type component properties, and setProperties() is the correct way to override them. Direct node.characters changes on property-managed text may be overridden by the component property system on render.
Step 1: Inspect componentProperties on a sample instance:
const instancePlan = $fig.instance(comp.id); // comp is a raw ComponentNode in this example
await $fig.done();
const instance = instancePlan.node; // raw InstanceNode for property inspection
const propDefs = instance.componentProperties;
// Returns e.g.: { "Label#2:0": { type: "TEXT", value: "Button" }, "Has Icon#4:64": { type: "BOOLEAN", value: true } }
return propDefs;Also check nested instances — a parent component may not expose text properties directly, but its nested child instances might:
const nestedInstances = instance.findAll(n => n.type === "INSTANCE");
const nestedProps = nestedInstances.map(ni => ({
name: ni.name,
id: ni.id,
properties: ni.componentProperties
}));Step 2: Use setProperties() for TEXT-type properties:
const instancePlan = $fig.instance(comp.id); // comp is a raw ComponentNode in this example
await $fig.done();
const instance = instancePlan.node; // raw InstanceNode for property inspection
const propDefs = instance.componentProperties;
for (const [key, def] of Object.entries(propDefs)) {
if (def.type === "TEXT") {
instance.setProperties({ [key]: "New text value" });
}
}For nested instances that expose their own TEXT properties, call setProperties() on the nested instance:
const nestedHeading = instance.findOne(n => n.type === "INSTANCE" && n.name === "Text Heading");
if (nestedHeading) {
nestedHeading.setProperties({ "Text#2104:5": "Actual heading text" });
}Step 3: Only fall back to direct node.characters for unmanaged text. If text is NOT controlled by any component property, find text nodes directly. Always load the node's actual font first — instance text nodes inherit fonts from the source component, so don't assume Inter Regular:
const textNodes = instance.findAll(n => n.type === "TEXT");
for (const t of textNodes) {
await figma.loadFontAsync(t.fontName);
t.characters = "Updated text";
}detachInstance() invalidates ancestor node IDs
Warning: When detachInstance() is called on a nested instance inside a library component instance, the parent instance may also get implicitly detached (converted from INSTANCE to FRAME with a new ID). Subsequent getNodeByIdAsync(oldParentId) returns null.
// WRONG — cached parent ID becomes invalid after child detach
const parentId = parentInstance.id;
nestedChild.detachInstance();
const parent = await figma.getNodeByIdAsync(parentId); // null!
// CORRECT — re-discover nodes by traversal from a stable (non-instance) parent
const stableFrame = await figma.getNodeByIdAsync(manualFrameId); // a frame YOU created
nestedChild.detachInstance();
// Re-find the parent by traversing from the stable frame
const parent = stableFrame.findOne(n => n.name === "ParentName");If you must detach multiple nested instances across sibling components, do it in a single use_figma call — discover all targets by traversal at the start before any detachment mutates the tree.
Inspecting Component Metadata (Deep Traversal)
These helpers extract the full property schema and descendant structure of a component. Useful for understanding complex components before creating instances or setting properties. For a library component, use $fig.get(componentKey) to wrap it, then read .node after await $fig.done().
/**
* Given a main component node, returns the component set parent if one exists,
* otherwise returns the component itself. Used to get the top-level node that
* holds `componentPropertyDefinitions`.
*
* @param {ComponentNode} mainComponent
* @returns {ComponentNode|ComponentSetNode}
*/
function getRelevantComponentNode(mainComponent) {
return mainComponent.parent.type === "COMPONENT_SET"
? mainComponent.parent
: mainComponent;
}
/**
* Extracts `componentPropertyDefinitions` from a component or component set node
* into a flat map keyed by property key.
*
* @param {ComponentNode|ComponentSetNode} node
* @returns {Record<string, {name: string, type: string, key: string, variantOptions?: string[]}>}
*/
function getComponentProps(node) {
const owner = node.type === "COMPONENT" && node.parent.type === "COMPONENT_SET"
? node.parent
: node;
const definitions = owner.componentPropertyDefinitions;
const result = {};
for (const key in definitions) {
const prop = {
name: key.replace(/#[^#]+$/, ""),
type: definitions[key].type,
key: key
};
if (prop.type === "VARIANT") {
prop.variantOptions = definitions[key].variantOptions;
}
result[key] = prop;
}
return result;
}
/**
* Recursively walks a component tree and collects all INSTANCE and TEXT nodes
* into `result`, keyed by `TYPE[name]`. Handles variant namespacing and
* deduplicates nodes with identical names but differing property references.
*
* @param {SceneNode} node - The node to traverse.
* @param {string[]} namespace - Accumulated variant names for the current path.
* @param {Record<string, object>} result - Accumulator object populated in place.
*/
function collectDescendants(node, namespace, result) {
if (node.type === "INSTANCE" || node.type === "TEXT") {
const references = node.componentPropertyReferences || {};
if (!node.visible && !references.visible) return;
const object = { type: node.type, name: node.name, references };
let key = `${node.type}[${node.name}]`;
if (result[key] && JSON.stringify(references) !== JSON.stringify(result[key].references)) {
key += btoa(btoa(unescape(encodeURIComponent(JSON.stringify(references)))));
}
if (node.type === "INSTANCE") {
const mainComponent = getRelevantComponentNode(node.mainComponent);
object.properties = getComponentProps(mainComponent);
object.descendants = {};
object.mainComponentName = mainComponent.name;
collectDescendants(mainComponent, [], object.descendants);
}
const start = namespace.length ? { variants: [] } : {};
result[key] = Object.assign(object, result[key] || start);
if (namespace.length) result[key].variants.push(namespace[namespace.length - 1]);
} else if ("children" in node && node.visible) {
if (node.type === "COMPONENT" && node.parent.type === "COMPONENT_SET") namespace.push(node.name);
node.children.forEach(child => collectDescendants(child, namespace, result));
}
}
/**
* Returns structured metadata for a component or component set defined in the current file.
*
* @param {string} componentId - The node ID of a COMPONENT or COMPONENT_SET node.
* @returns {Promise<{name: string, nodeId: string, properties: object, descendants: object}|undefined>}
*/
async function getLocalComponentMetadata(componentId) {
const node = await figma.getNodeByIdAsync(componentId);
if (node.type === "COMPONENT_SET" || node.type === "COMPONENT") {
const result = {
name: node.name,
nodeId: node.id,
properties: {},
descendants: {}
};
result.properties = getComponentProps(node);
collectDescendants(node, [], result.descendants);
return result;
} else {
throw new Error("Node is not a Component or Component Set");
}
}
/**
* Returns structured metadata for a published component or component set loaded by its key.
*
* @param {string} componentKey - The published key of the component or component set.
* @returns {Promise<{name: string, nodeId: string, properties: object, descendants: object}>}
*/
async function getPublishedComponentMetadata(componentKey) {
// $fig.get queues the library import in the plan; await $fig.done() to
// materialize, then read the live SceneNode via planNode.node.
const planNode = $fig.get(componentKey);
await $fig.done();
const node = planNode.node;
if (!node || (node.type !== 'COMPONENT' && node.type !== 'COMPONENT_SET')) {
throw new Error(`No Component or Component Set available with key '${componentKey}'`);
}
const result = {
name: node.name,
nodeId: node.id,
properties: getComponentProps(node),
descendants: {},
};
collectDescendants(node, [], result.descendants);
return result;
}Full metadata extraction script
// For local components, use getLocalComponentMetadata:
const result = await getLocalComponentMetadata('COMPONENT_OR_SET_ID');
return result;
// For published components, use getPublishedComponentMetadata:
// const result = await getPublishedComponentMetadata('COMPONENT_KEY');
// return result;