@redocly/openapi-core/lib/rules/common/assertions/index.js

See https://github.com/Redocly/redocly-cli

import { buildSubjectVisitor, buildVisitorObject } from './utils.js';
import { isString } from '../../../utils/is-string.js';
export const Assertions = (opts) => {
    const visitors = [];
    // As 'Assertions' has an array of asserts,
    // that array spreads into an 'opts' object on init rules phase here
    // https://github.com/Redocly/redocly-cli/blob/main/packages/core/src/config/config.ts#L311
    // that is why we need to iterate through 'opts' values;
    // before - filter only object 'opts' values
    const assertions = Object.values(opts).filter((opt) => typeof opt === 'object' && opt !== null);
    for (const [_, assertion] of assertions.entries()) {
        if (!isString(assertion.subject.type)) {
            throw new Error(`${assertion.assertionId}: 'type' (String) is required`);
        }
        const subjectVisitor = buildSubjectVisitor(assertion.assertionId, assertion);
        const visitorObject = buildVisitorObject(assertion, subjectVisitor);
        visitors.push(visitorObject);
    }
    return visitors;
};
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