@redocly/openapi-core/lib/rules/oas3/no-undefined-server-variable.js

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

export const NoUndefinedServerVariable = () => {
    return {
        Server(server, { report, location }) {
            if (!server?.url)
                return;
            const urlVariables = server.url.match(/{[^}]+}/g)?.map((e) => e.slice(1, e.length - 1)) || [];
            const definedVariables = (server?.variables && Object.keys(server.variables)) || [];
            for (const serverVar of urlVariables) {
                if (!definedVariables.includes(serverVar)) {
                    report({
                        message: `The \`${serverVar}\` variable is not defined in the \`variables\` objects.`,
                        location: location.child(['url']),
                    });
                }
            }
            for (const definedServerVar of definedVariables) {
                if (!urlVariables.includes(definedServerVar)) {
                    report({
                        message: `The \`${definedServerVar}\` variable is not used in the server's \`url\` field.`,
                        location: location.child(['variables', definedServerVar]).key(),
                        from: location.child('url'),
                    });
                }
            }
        },
    };
};
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