17 lines
546 B
TypeScript
17 lines
546 B
TypeScript
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import type { SceneGraph, SceneNode } from '@open-pencil/core'
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export function expectDefined<T>(value: T | null | undefined, label = 'value'): NonNullable<T> {
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if (value == null) {
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throw new Error(`${label} was expected to be defined`)
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}
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return value
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}
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export function getNodeOrThrow(graph: SceneGraph, id: string): SceneNode {
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return expectDefined(graph.getNode(id), `node ${id}`)
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}
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export function childIdAt(node: SceneNode, index: number): string {
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return expectDefined(node.childIds[index], `child ${index} of ${node.id}`)
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}
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