@redocly/openapi-core/lib/rules/catalog-entity/entity-key-valid.js

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

const validKeyPattern = /^[a-z0-9]+(?:-[a-z0-9]+)*$/;
const MIN_KEY_LENGTH = 2;
const MAX_KEY_LENGTH = 150;
export const EntityKeyValid = () => {
    return {
        any(node, { report, location }) {
            if (typeof node === 'object' && node !== null && 'key' in node) {
                const key = node.key;
                if (typeof key !== 'string') {
                    report({
                        message: 'Entity `key` must be a string.',
                        location: location.child(['key']),
                    });
                    return;
                }
                if (key.length < MIN_KEY_LENGTH) {
                    report({
                        message: `Entity 'key' must be at least ${MIN_KEY_LENGTH} characters long.`,
                        location: location.child(['key']),
                    });
                }
                if (key.length > MAX_KEY_LENGTH) {
                    report({
                        message: `Entity 'key' must not exceed ${MAX_KEY_LENGTH} characters.`,
                        location: location.child(['key']),
                    });
                }
                if (!validKeyPattern.test(key)) {
                    report({
                        message: 'Entity `key` must contain only lowercase letters, numbers, and hyphens, and cannot start or end with a hyphen.',
                        location: location.child(['key']),
                    });
                }
            }
        },
    };
};
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