tyneq

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tyneq / isSourceNode

Function: isSourceNode()

isSourceNode(node): node is IQueryNode & { sourceKind: SourceKind }

Defined in: src/types/queryplan.ts:90

Narrows a QueryPlanNode to one that is guaranteed to have a sourceKind.

Parameters

Parameter	Type
node	IQueryNode

Returns

node is IQueryNode & { sourceKind: SourceKind }

Remarks

sourceKind is only present on source nodes (category === "source"). Reading it on any other node returns undefined. Use this guard before accessing node.sourceKind to get proper type narrowing and avoid ambiguous undefined.

Example

if (isSourceNode(node)) {
    console.log(node.sourceKind); // "array" | "set" | "map" | "string" | "other"
}