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// Checks the availability of a dependency and provides the result to later
// steps under '#availability' (by default). This is mainly intended for use
// by the more specific utilities, which you should consider using instead.
//
// Customize {mode} to select one of these modes, or default to 'null':
//
// * 'null': Check that the value isn't null (and not undefined either).
// * 'empty': Check that the value is neither null, undefined, nor an empty
// array.
// * 'falsy': Check that the value isn't false when treated as a boolean
// (nor an empty array). Keep in mind this will also be false
// for values like zero and the empty string!
// * 'index': Check that the value is a number, and is at least zero.
//
// See also:
// - exitWithoutDependency
// - exitWithoutUpdateValue
// - exposeDependencyOrContinue
// - exposeUpdateValueOrContinue
// - raiseOutputWithoutDependency
// - raiseOutputWithoutUpdateValue
//
import {input, templateCompositeFrom} from '#composite';
import {empty} from '#sugar';
import inputAvailabilityCheckMode from './inputAvailabilityCheckMode.js';
export default templateCompositeFrom({
annotation: `withResultOfAvailabilityCheck`,
inputs: {
from: input({acceptsNull: true}),
mode: inputAvailabilityCheckMode(),
},
outputs: ['#availability'],
steps: () => [
{
dependencies: [input('from'), input('mode')],
compute: (continuation, {
[input('from')]: value,
[input('mode')]: mode,
}) => {
let availability;
switch (mode) {
case 'null':
availability = value !== undefined && value !== null;
break;
case 'empty':
availability = value !== undefined && !empty(value);
break;
case 'falsy':
availability = !!value && (!Array.isArray(value) || !empty(value));
break;
case 'index':
availability = typeof value === 'number' && value >= 0;
break;
}
return continuation({'#availability': availability});
},
},
],
});
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