@snups/rjsf-utils/lib/getDiscriminatorFieldFromSchema.js

Utility functions for @snups/rjsf-core

import get from 'lodash-es/get.js';
import isString from 'lodash-es/isString.js';
import { DISCRIMINATOR_PATH } from './constants.js';
/** Returns the `discriminator.propertyName` when defined in the `schema` if it is a string. A warning is generated when
 * it is not a string. Returns `undefined` when a valid discriminator is not present.
 *
 * @param schema - The schema from which the discriminator is potentially obtained
 * @returns - The `discriminator.propertyName` if it exists in the schema, otherwise `undefined`
 */
export default function getDiscriminatorFieldFromSchema(schema) {
    let discriminator;
    const maybeString = get(schema, DISCRIMINATOR_PATH);
    if (isString(maybeString)) {
        discriminator = maybeString;
    }
    else if (maybeString !== undefined) {
        console.warn(`Expecting discriminator to be a string, got "${typeof maybeString}" instead`);
    }
    return discriminator;
}
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