Function parsePatchProps

dash/dash-renderer/src/actions/patch.ts:307–331

(
    props: any,
    previousProps: any
)

}

export function parsePatchProps(
    props: any,
    previousProps: any
): Record<string, any> {
    if (!is(Object, props)) {
        return props;
    }

    const patchedProps: any = {};

    for (const key of Object.keys(props)) {
        const val = props[key];
        if (isPatch(val)) {
            const previousValue = previousProps[key];
            if (previousValue === undefined) {
                throw new Error('Cannot patch undefined');
            }
            patchedProps[key] = handlePatch(previousValue, val);
        } else {
            patchedProps[key] = val;
        }
    }

    return patchedProps;
}