feat(nexus-operations): add capability flag, guard component, and configurable table columns

[rossedfort]

Motivation

Phase 2 of Standalone Nexus Operations (DT-4006). Phase 1 (DT-4005) shipped the API integrations — types, services, stores, poller, route helpers, and filters. This phase ships the feature-gating infrastructure that Phase 3 (DT-4004) will consume when rendering the actual UI.

What changed

Capability type extension (src/lib/types/index.ts)

The standaloneNexusOperations capability flag does not yet exist in @temporalio/proto. The same pattern used for serverScaledDeployments is applied here — a NamespaceCapabilities intersection type that extends the proto ICapabilities with the custom field:

export type NamespaceCapabilities =
  NonNullable<
    NonNullable<DescribeNamespaceResponse['namespaceInfo']>['capabilities']
  > & {
    standaloneNexusOperations?: boolean | null;
  };

The guard component casts to this type when checking the flag, so the rest of the codebase remains unaffected until the proto ships.

Guard component (standalone-nexus-operations-guard.svelte)

Mirrors standalone-activities-guard.svelte. Gates on both the namespace capability flag (standaloneNexusOperations) and server version ≥ 1.31.0. Renders children when both conditions are true, fallback (if provided) otherwise.

Disabled state component (standalone-nexus-operations-disabled.svelte)

Shown by the route page when the guard renders the fallback. Displays an info alert and Dynamic Config instructions (global and per-namespace) explaining how to enable the feature.

i18n strings (src/lib/i18n/locales/en/standalone-nexus-operations.ts)

New namespace with the 4 strings required by the disabled component. Registered in src/lib/i18n/locales/en/index.ts alongside StandaloneActivities.

Configurable table columns (src/lib/stores/configurable-table-columns.ts)

All 8 atomic changes applied together (partial application causes pnpm check failures because ConfigurableTableType expands and all switch statements become non-exhaustive):

• TABLE_TYPE.NEXUS_OPERATIONS = 'nexus-operations' added to the const map
• NexusOperationHeaderLabels tuple and NexusOperationHeaderLabel type exported
• DEFAULT_NEXUS_OPERATIONS_COLUMNS (6 default columns) and DEFAULT_AVAILABLE_NEXUS_OPERATIONS_COLUMNS (4 optional columns) exported/defined
• persistedNexusOperationsTableColumns persist store added
• configurableTableColumns derived store extended with the new persist store and 'nexus-operations' key in getTableColumns
• availableNexusOperationColumns exported derived store for the column picker UI
• getDefaultColumns and getPersistedColumns switches extended with TABLE_TYPE.NEXUS_OPERATIONS cases

Testing

• pnpm check — zero new errors
• pnpm lint — zero new errors in changed files
• pnpm test -- --run — all 140 unit tests pass

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Project	Deployment	Actions	Updated (UTC)
holocene	Ready	Preview, Comment	May 27, 2026 7:48pm