client-modules: window.ModuleLoader.create called after

Error message

client-modules: window.__ModuleLoader__.create called after module-system boot

What it means

Error "client-modules: window.__ModuleLoader__.create called after module-system boot" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/client/modules/src/client/system.ts:93

    this.loadBundle = options.loadBundle ?? defaultLoadBundle

    for (const row of options.manifest.modules) {
      if (this.graphRows.has(row.id)) throw new Error(`client-modules: duplicate graph entry "${row.id}"`)
      this.graphRows.set(row.id, row)
    }

    const bootstrapId = stripClientSuffix(options.bootstrapModule.id)
    this.bootstrapIds.add(bootstrapId)
    this.loadCache.set(bootstrapId, {
      id: bootstrapId,
      exports: options.bootstrapModule.exports,
      styles: [],
      edges: new Set(),
    })

    const target = options.registrationTarget
    if (target.mode !== 'queue') {
      throw new Error('client-modules: window.__ModuleLoader__.create called after module-system boot')
    }
    const pending = target.pendingQueue.splice(0)
    // Switch first: a bundle that executes while pending registrations drain
    // must register live rather than append behind the drain.
    target.mode = 'live'
    target.load = (registration) => { this.register(registration) }
    for (const registration of pending) target.load(registration)
  }

  /** Register one bundle factory, rejecting a script that executes twice without invalidation. */
  private register(registration: ClientBundleRegistration): void {
    const id = stripClientSuffix(registration.id)
    if (this.bootstrapIds.has(id) || this.factories.has(id)) {
      throw new Error(`client-modules: duplicate factory registration for "${registration.id}" (bundle executed twice without invalidate?)`)
    }
    this.factories.set(id, registration.factory)
  }

View on GitHub (pinned to b150a551b8)

Solutions

Call __ModuleLoader__.create before module-system boot completes.

When it happens

Trigger: Thrown at packages/client/modules/src/client/system.ts:93 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/330d9032bb37f9f1. Report an issue: GitHub.