Function extractBearerTokenProviders

nodejs/src/client.ts:182–216

* Strips the non-serializable BearerTokenProvider callbacks from the singular * and named provider configs before they cross the RPC boundary, replacing each * with a `hasBearerTokenProvider: true` wire flag. The callback closes over its * own token scope/audience, so nothing scope-relate

(
    provider: ProviderConfig | undefined,
    providers: NamedProviderConfig[] | undefined
)

 * for session-side registration.
 */
function extractBearerTokenProviders(
    provider: ProviderConfig | undefined,
    providers: NamedProviderConfig[] | undefined
): {
    wireProvider: WireProviderConfig | undefined;
    wireProviders: WireNamedProviderConfig[] | undefined;
    callbacks: Map<string, BearerTokenProvider>;
} {
    const callbacks = new Map<string, BearerTokenProvider>();

    let wireProvider: WireProviderConfig | undefined = provider;
    if (provider?.bearerTokenProvider) {
        const { bearerTokenProvider, ...rest } = provider;
        callbacks.set(DEFAULT_PROVIDER_NAME, bearerTokenProvider);
        wireProvider = {
            ...rest,
            hasBearerTokenProvider: true,
        };
    }

    let wireProviders: WireNamedProviderConfig[] | undefined = providers;
    if (providers?.some((p) => p.bearerTokenProvider)) {
        wireProviders = providers.map((p) => {
            if (!p.bearerTokenProvider) return p;
            const { bearerTokenProvider, ...rest } = p;
            callbacks.set(p.name, bearerTokenProvider);
            return {
                ...rest,
                hasBearerTokenProvider: true,
            };
        });
    }

    return { wireProvider, wireProviders, callbacks };
}

/**
 * Convert MCP server configs from public API format (workingDirectory) to