/**
 * Package-owned invariant companion for `@deepseek-ai/dsh-token-meter`.
 * @module @deepseek-ai/dsh-token-meter/invariant
 */

/* jscpd:ignore-start */
import type { Context } from 'cordis'
import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'

const PACKAGE_NAME = '@deepseek-ai/dsh-token-meter'

/** Cordis companion plugin name. */
export const name = 'token-meter-invariant'
/** Service required before the companion can reserve package ownership. */
export const inject = ['invariants']

/**
 * No runtime invariant: token estimates are per-call outputs and the private
 * session cache is invalidated at its event mutation boundary. The package's
 * projection does expose an observation stream, but its schema fixes the JSON
 * payload and its pure fold replaces same-step samples; totals need not be
 * monotone when a final usage sample corrects an earlier chunk.
 */
const install: InvariantInstaller = () => {}

/**
 * Register this package's invariant companion.
 * @param ctx - Cordis context carrying the invariant service.
 * @returns the installed registration's disposer after setup succeeds.
 */
export const apply = (ctx: Context): Promise<() => void> =>
  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
/* jscpd:ignore-end */