deepseek-ai/deepseek-harness · error · LspError

LSP_CONFLICT

LSP_CONFLICT

Error message

an LSP provider with id "${id}" is already registered

What it means

Error "an LSP provider with id "${id}" is already registered" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/lsp/lsp/src/index.ts:98

 * together per provider so a route always has a live provider.
 */
export class Lsp extends Service implements LspService {
  private readonly providerIds = new Set<LspProviderId>()
  private readonly routes = new Map<string, Route>()

  constructor(ctx: Context) {
    super(ctx, 'lsp')
  }

  registerProvider(provider: LspProvider): () => void {
    // Validate and conflict-check everything BEFORE any mutation: an invalid or conflicting
    // registration must publish nothing (fail-loud, all-or-nothing).
    const id = provider.id
    if (id.trim() === '') {
      throw new LspError('an LSP provider id must be a non-empty string', 'LSP_INVALID_PROVIDER')
    }
    if (this.providerIds.has(id)) {
      throw new LspError(`an LSP provider with id "${id}" is already registered`, 'LSP_CONFLICT')
    }

    const entries = Object.entries(provider.extensionToLanguage)
    if (entries.length === 0) {
      throw new LspError(`LSP provider "${id}" registers no file extensions`, 'LSP_INVALID_PROVIDER')
    }

    // Normalize into this provider's route set, catching intra-provider duplicates (e.g. `.TS` and
    // `.ts`) before checking cross-provider conflicts.
    const pending = new Map<string, Route>()
    for (const [rawExt, languageId] of entries) {
      const ext = normalizeExtension(rawExt)
      if (!EXTENSION_PATTERN.test(ext)) {
        throw new LspError(`LSP provider "${id}" maps an invalid extension "${rawExt}"`, 'LSP_INVALID_PROVIDER')
      }
      if (languageId.trim() === '') {
        throw new LspError(`LSP provider "${id}" maps extension "${ext}" to an empty language id`, 'LSP_INVALID_PROVIDER')
      }

View on GitHub (pinned to b150a551b8)

Solutions

1. Use a unique LSP provider id.

When it happens

Trigger: Thrown at packages/lsp/lsp/src/index.ts:98 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/7b439b5d7a6ffa56. Report an issue: GitHub.