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

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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