@maplibre/maplibre-gl-style-spec/src/validate/validate_constants.ts

a specification for maplibre styles

import {ValidationError} from '../error/validation_error';

export function validateConstants(options) {
    const key = options.key;
    const constants = options.value;

    if (constants) {
        return [new ValidationError(key, constants, 'constants have been deprecated as of v8')];
    } else {
        return [];
    }
}