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

a specification for maplibre styles

import {getType} from '../util/get_type';
import {ValidationError} from '../error/validation_error';

export function validateBoolean(options) {
    const value = options.value;
    const key = options.key;
    const type = getType(value);

    if (type !== 'boolean') {
        return [new ValidationError(key, value, `boolean expected, ${type} found`)];
    }

    return [];
}