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// Gets a property of some object (in a dependency) and provides that value.
// If the object itself is null, or the object doesn't have the listed property,
// the provided dependency will also be null.
//
// See also:
// - withPropertiesFromObject
// - withPropertyFromList
//
import {input, templateCompositeFrom} from '#composite';
export default templateCompositeFrom({
annotation: `withPropertyFromObject`,
inputs: {
object: input({type: 'object', acceptsNull: true}),
property: input({type: 'string'}),
},
outputs: ({
[input.staticDependency('object')]: object,
[input.staticValue('property')]: property,
}) =>
(object && property
? (object.startsWith('#')
? [`${object}.${property}`]
: [`#${object}.${property}`])
: ['#value']),
steps: () => [
{
dependencies: [
input.staticDependency('object'),
input.staticValue('property'),
],
compute: (continuation, {
[input.staticDependency('object')]: object,
[input.staticValue('property')]: property,
}) => continuation({
'#output':
(object && property
? (object.startsWith('#')
? `${object}.${property}`
: `#${object}.${property}`)
: '#value'),
}),
},
{
dependencies: [
'#output',
input('object'),
input('property'),
],
compute: (continuation, {
['#output']: output,
[input('object')]: object,
[input('property')]: property,
}) => continuation({
[output]:
(object === null
? null
: object[property] ?? null),
}),
},
],
});
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