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* Typed Dependency Injection tokens.
*
* Each token is a unique Symbol used to register and resolve a service
* from the {@link DIContainer}. Centralising them here avoids "magic"
* inline Symbol literals and guarantees consistent identifiers across
* the whole application.
*
* ISMS Policy: AC-003 (Least Privilege), SC-002 (Input Validation)
*
* @module di/tokens
*
* @example
* ```typescript
* import { TOKENS } from './tokens.js';
* import { container } from './container.js';
*
* const metricsService = container.resolve<MetricsService>(TOKENS.MetricsService);
* ```
*/
/**
* Centralised DI token registry.
*
* `as const` makes the registry object itself readonly and ensures each
* property value is inferred as `symbol` (not widened to `object`).
* For type-level uniqueness, each `Symbol(...)` is a distinct runtime value;
* `DIToken` is the union of all token values for generic container utilities.
*
* @since 0.8.0
*/
export const TOKENS = {
/**
* European Parliament API client
* (`EuropeanParliamentClient` from `clients/europeanParliamentClient`)
*/
EPClient: Symbol('EPClient'),
/**
* Performance metrics collection service
* (`MetricsService` from `services/MetricsService`)
*/
MetricsService: Symbol('MetricsService'),
/**
* GDPR-compliant audit logger
* (`AuditLogger` from `utils/auditLogger`)
*/
AuditLogger: Symbol('AuditLogger'),
/**
* Token-bucket rate limiter for EP API calls
* (`RateLimiter` from `utils/rateLimiter`)
*/
RateLimiter: Symbol('RateLimiter'),
/**
* Server health-check service
* (`HealthService` from `services/HealthService`)
*/
HealthService: Symbol('HealthService'),
} as const;
/**
* Union type of all registered DI token values.
* Useful for writing type-safe generic container utilities.
*
* @since 0.8.0
*/
export type DIToken = (typeof TOKENS)[keyof typeof TOKENS];
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