Function selectCollapsedFrom

Returns KeyCount<
    ExcludeEmpty<
        NonNullable<
            Full extends readonly Element[]
                ? (
                    | Exclude<Element, AnyObject>
                    | (
                        Extract<Element, AnyObject> extends readonly Element[]
                            ? (Exclude<(...), (...)> | ((...) extends (...) ? (...) : (...)))[]
                            : MakeKeysOptional<
                                Extract<Element, AnyObject>,
                                {
                                    -readonly [Key in (...) | (...) | (...) as (...) extends (...)
                                        ? (...)
                                        : (...)]: any
                                },
                            >
                    )
                )[]
                : MakeKeysOptional<
                    Full,
                    {
                        -readonly [Key in string
                        | number
                        | symbol as Selection[Key] extends false ? never : any]: any
                    },
                >,
        >,
    >,
> extends 1
    ? Selection[keyof (
        Full extends readonly Element[]
            ? (
                | Exclude<Element, AnyObject>
                | (
                    Extract<Element, AnyObject> extends readonly Element[]
                        ? (Exclude<(...), (...)> | ((...) extends (...) ? (...) : (...)))[]
                        : MakeKeysOptional<
                            Extract<Element, AnyObject>,
                            {
                                -readonly [Key in (...) | (...) | (...) as (...) extends (...)
                                    ? (...)
                                    : (...)]: any
                            },
                        >
                )
            )[]
            : MakeKeysOptional<
                Full,
                {
                    -readonly [Key in string
                    | number
                    | symbol as Selection[Key] extends false ? never : any]: any
                },
            >
    )] extends GenericSelectionSet
        ? | (
            KeyCount<
                ExcludeEmpty<
                    NonNullable<
                        NonNullable<Full[keyof (...)]> extends readonly Element[]
                            ? (Exclude<(...), (...)> | ((...) extends (...) ? (...) : (...)))[]
                            : MakeKeysOptional<
                                NonNullable<(...)[(...)]>,
                                {
                                    -readonly [Key in (...) | (...) | (...) as (...) extends (...)
                                        ? (...)
                                        : (...)]: any
                                },
                            >,
                    >,
                >,
            > extends 1
                ? any[any][keyof (
                    NonNullable<Full[keyof (...)]> extends readonly Element[]
                        ? (Exclude<(...), (...)> | ((...) extends (...) ? (...) : (...)))[]
                        : MakeKeysOptional<
                            NonNullable<(...)[(...)]>,
                            {
                                -readonly [Key in (...) | (...) | (...) as (...) extends (...)
                                    ? (...)
                                    : (...)]: any
                            },
                        >
                )] extends GenericSelectionSet
                    ? | (
                        KeyCount<
                            ExcludeEmpty<NonNullable<(...) extends (...) ? (...) : (...)>>,
                        > extends 1
                            ? any[any][keyof ((...) extends (...) ? (...) : (...))] extends GenericSelectionSet
                                ?
                                    | (
                                        KeyCount<(...)> extends 1
                                            ? (...) extends (...) ? (...) : (...)
                                            : any
                                    )
                                    | Extract<(...)[(...)], (...) | (...)>
                                : any
                            : any
                    )
                    | Extract<
                        NonNullable<Full[keyof (...)]>[keyof (
                            NonNullable<(...)> extends readonly (...)[]
                                ? (...)[]
                                : MakeKeysOptional<(...), (...)>
                        )],
                        undefined | null,
                    >
                    : any
                : any
        )
        | Extract<
            Full[keyof (
                Full extends readonly Element[]
                    ? (
                        | Exclude<Element, AnyObject>
                        | (
                            Extract<(...), (...)> extends readonly (...)[]
                                ? (...)[]
                                : MakeKeysOptional<(...), (...)>
                        )
                    )[]
                    : MakeKeysOptional<
                        Full,
                        {
                            -readonly [Key in string
                            | number
                            | symbol as (...)[(...)] extends false ? never : any]: any
                        },
                    >
            )],
            undefined
            | null,
        >
        : any
    : any

import {selectCollapsedFrom} from '@augment-vir/common';

selectCollapsedFrom(
    [
        {
            child: {
                grandChild: 'hi',
                grandChild2: 3,
                grandChild3: /something/,
            },
        },
        {
            child: {
                grandChild: 'hi',
                grandChild2: 4,
                grandChild3: /something/,
            },
        },
    ],
    {
        child: {
            grandChild2: true,
        },
    },
);
// output is `[3, 4]`
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