Services Extension Consumption

Consuming salesforcedx-vscode-services

Extensions depending on salesforcedx-vscode-services. Examples: salesforcedx-vscode-metadata, salesforcedx-vscode-org-browser.

Getting the API

Use ExtensionProviderService from @salesforce/effect-ext-utils:

import { ExtensionProviderService, getServicesApi } from '@salesforce/effect-ext-utils';

const ExtensionProviderServiceLive = Layer.effect(
  ExtensionProviderService,
  Effect.sync(() => ({
    getServicesApi
  }))
);

// In an Effect.gen:
const api = yield * (yield * ExtensionProviderService).getServicesApi;

Prebuilt vs Per-Extension Services

api.services.prebuiltServicesLayer — shared service instances plus runtime configuration, including the redacting logger. Provide or merge this layer directly.

api.services.prebuiltServicesDependencies — deprecated context-only compatibility field. It omits FiberRef runtime configuration; new consumers must use prebuiltServicesLayer.

Shares singleton instances (caches, watchers) across extensions; avoids re-building stateful services.

Per-extension layers (must build yourself):

ExtensionContext Setup

Preferred: import buildAllServicesLayer from @salesforce/effect-ext-utils. It reads displayName from package.json, falling back to the second arg. services/extensionProvider.ts only needs the mutable AllServicesLayer + setter:

// services/extensionProvider.ts
import { buildAllServicesLayer } from '@salesforce/effect-ext-utils';

export let AllServicesLayer: ReturnType<typeof buildAllServicesLayer>;
export const setAllServicesLayer = (layer: ReturnType<typeof buildAllServicesLayer>) => {
  AllServicesLayer = layer;
};

In activate — pass the context and a localized fallback channel name:

import { buildAllServicesLayer } from '@salesforce/effect-ext-utils';
import { nls } from './messages';
import { setAllServicesLayer } from './services/extensionProvider';

export const activate = async (context: vscode.ExtensionContext): Promise<void> => {
  setAllServicesLayer(buildAllServicesLayer(context, nls.localize('channel_name')));
  await getRuntime().runPromise(activateEffect(context));
};

Two patterns exist depending on whether the extension adds services beyond the shared base:

• Shared base only (core, apex, apex-testing, lightning, lwc, org, visualforce): import buildAllServicesLayer directly from @salesforce/effect-ext-utils and pass it to setAllServicesLayer at activation. No local factory needed.
• Extension-specific services added (apex-debugger, apex-log, apex-oas, apex-replay-debugger, metadata, org-browser, soql): define a local buildAllServicesLayer in services/extensionProvider.ts that calls buildSharedServicesLayer from @salesforce/effect-ext-utils and merges the extension's own Effect services via Layer.mergeAll. The extra services vary — apex-oas adds ApexMetadataService and LLMService; extensions with the notifications system add NotificationModeService.Default; org-browser adds OrgBrowserRetrieveService.

Runtime vs provide

• Do: Build ManagedRuntime.make(AllServicesLayer) and export getRuntime().
• Do: Export runtime disposal, clear the memo, and call it during extension deactivation.
• Do: Use getRuntime().runPromise(effect) / runFork(effect) for ad-hoc execution.
• Don't: Use Effect.provide(AllServicesLayer) at call sites — use the runtime instead.

export const disposeRuntime = async (): Promise<void> => {
  if (_runtime) {
    await _runtime.dispose();
    _runtime = undefined;
  }
};

export const deactivate = async (): Promise<void> => {
  await getRuntime().runPromise(deactivation()).finally(disposeRuntime);
};

Resource Lifecycle

Prefer Effect scope ownership for resources created inside Effect services/layers:

• Define resource-owning services with scoped.
• Register VS Code Disposables with Effect.addFinalizer.
• Attach long-lived fibers to the owning scope with Effect.forkIn.
• Dispose the owning ManagedRuntime on deactivation so layer finalizers run.
• Don't expose runDispose/dispose solely for consumers to add to context.subscriptions.
• Keep context.subscriptions for resources created outside an Effect scope.

Allocation and cleanup stay together. See ../effect-best-practices/SKILL.md#effect-owned-resources.

Registering Commands

Use registerCommandWithRuntime:

import { myCommandEffect } from './commands/myCommand';

const api = yield * (yield * ExtensionProviderService).getServicesApi;

const registerCommand = api.services.registerCommandWithRuntime(getRuntime());
yield * registerCommand('sf.my.command', myCommandEffect);

Commands auto:

• Register with ExtensionContext subscriptions
• Wrap with error handling
• Trace with observability spans
• Handle Cancellation

Activation ordering

activate() awaits getRuntime().runPromise(activateEffect(context)); it does not detach the main activation Effect. Only work explicitly started with Effect.fork* continues after activation completes.

Register all manifest-contributed UI before awaiting work that can be slow or unresolved:

1. Register tree/webview providers and put any returned Disposable in context.subscriptions when it is not scope-owned.
2. Restore the extension's persisted UI state and set its context keys.
3. Register every contributed command.
4. Set an extension-owned readiness context key only after steps 1-3 succeed, and use it to gate title/menu commands that would otherwise be visible.
5. Only then await connection resolution, target-org readiness, catalog hydration, or network work. Use Effect.forkIn for long-lived watchers that do not need to block activation.

when clauses can expose a contributed command before its handler has registered. A context key owned by another extension, including sf:has_target_org, is a visibility hint, not proof that this extension has initialized. Do not make a contributed handler's registration depend on it. Keep target-org and authorization checks in the command implementation or shared service layer.

export const activateEffect = Effect.fn(`activation:${EXTENSION_NAME}`)(function* (context: vscode.ExtensionContext) {
  const api = yield* (yield* ExtensionProviderService).getServicesApi;
  const provider = new MyTreeProvider();
  context.subscriptions.push(vscode.window.registerTreeDataProvider(VIEW_ID, provider));

  yield* setInitialContext();
  const registerCommand = api.services.registerCommandWithRuntime(getRuntime());
  yield* registerCommand('sf.my.command', () => myCommand(provider));
  yield* Effect.promise(() => vscode.commands.executeCommand('setContext', 'sf:myExtension.ready', true));

  // Command registration must not wait for org-backed initialization.
  yield* api.services.ConnectionService.getConnection();
});

Success handling

Effect.fn accepts middleware args after the generator. Put success-side middleware before catchTag/catchAll — otherwise caught errors become successes.

export const deployActiveEditorCommand = Effect.fn('deploySourcePath.deployActiveEditor')(
  function* () {
    // ...core logic...
  },
  // runs only on success — placed before catchTag
  withConfigurableSuccessNotification(nls.localize('command_succeeded_text', label)),
  // catches errors — placed after success middleware
  Effect.catchTag('NoActiveEditorError', () =>
    Effect.promise(() => vscode.window.showErrorMessage(nls.localize('deploy_select_file_or_directory'))).pipe(
      Effect.as(undefined)
    )
  )
);

withConfigurableSuccessNotification wraps the effect with Effect.tap, so it only fires when the effect succeeds:

export const withConfigurableSuccessNotification =
  (message: string) =>
  <A, E, R>(effect: Effect.Effect<A, E, R>) =>
    Effect.tap(effect, () =>
      Effect.sync(() => {
        const show = vscode.workspace.getConfiguration(SECTION).get<boolean>(KEY, false);
        if (show) void vscode.window.showInformationMessage(message);
      })
    );

Invoking sf.org.login.web

Cross-extension / executeCommand: vscode.commands.executeCommand('sf.org.login.web', instanceUrl?, reauthAliasOrUsername?).

• No args: interactive flow (palette).
• With instanceUrl: skips org-type quick pick.
• Second arg applies only when instanceUrl was provided: trimmed non-empty string becomes the auth alias (access-token re-auth); else alias defaults to reauth-vscodeOrg.

Basic Services

Accessor pattern: call methods directly, don't assign to variable first.

• ChannelService - Output channel
• ComponentSetService - Build component sets (source, manifest, URIs)
• MediaService - Icons (ICONS) and NLS descriptions
• WorkspaceService - Workspace info
• ConnectionService - Org connections
• ProjectService - Project resolution, packageDirectories
• SettingsService - Settings read/write
• FsService - File ops (web-compatible), uri/path conversion, HashableUri (value-based URI equality for HashSet/HashMap keys)
• EditorService - Active editor changes and current URI
• Prompts - QuickPick, InputBox, and UserCancellationError handling
• TerminalService - Run shell commands (desktop-only)
• NotificationModeService - Configurable success notifications

Watchers

File Watching

FileWatcherService exposes a PubSub of all workspace file changes (**/*). Subscribe and filter:

import * as PubSub from 'effect/PubSub';
import * as Stream from 'effect/Stream';

const fileWatcher = yield * api.services.FileWatcherService;

yield* Stream.fromPubSub(fileWatcher.pubsub).pipe(
    Stream.filter(event => /* match event.uri to your pattern */),
    Stream.runForEach(event =>
      Effect.sync(() => {
        // Handle event: { type: 'create'|'change'|'delete', uri }
      })
    )
  );

Config Watching

Watch VS Code config changes:

import * as PubSub from 'effect/PubSub';
import * as Stream from 'effect/Stream';
import * as Duration from 'effect/Duration';

const pubsub = yield * PubSub.sliding<vscode.ConfigurationChangeEvent>(100);
const disposable = vscode.workspace.onDidChangeConfiguration(event => {
  Effect.runSync(PubSub.publish(pubsub, event));
});

yield *
  Effect.addFinalizer(() =>
    Effect.sync(() => {
      disposable?.dispose();
    })
  );

yield *
  Stream.fromPubSub(pubsub).pipe(
    Stream.filter(event => event.affectsConfiguration('section.setting')),
    Stream.debounce(Duration.millis(100)),
    Stream.runForEach(() => {
      // Handle config change
    })
  );

Target Org Changes

Watch org changes via TargetOrgRef (SubscriptionRef):

const ref = yield * api.services.TargetOrgRef();
yield *
  ref.changes.pipe(
    Stream.map(org => org.orgId),
    Stream.changes,
    Stream.tap(orgId => {
      // Handle org change
    }),
    Stream.runForEach(() => {
      // Refresh UI, invalidate caches, etc.
    })
  );

TargetOrgRef is a SubscriptionRef: ref.changes already emits the current value first, so never prepend an explicit get. See the SubscriptionRef section of ../effect-best-practices/SKILL.md for the mechanic (incl. Stream.drop(1) to skip the initial snapshot).

Ref behavior (concise):

• Default-org update: username from User SOQL when present; else AuthInfo login username on the connection.
• TargetOrgRef snapshot without username: optional ConfigUtil.getUsername() (project default) before treating as no target org.
• TargetOrgRef value is always an object (never undefined); only fields like orgId within it are optional.

Clearing the Default Org

Call ClearDefaultOrgRef() to reset the in-process org ref (e.g., after deleting the default org):

yield* api.services.ClearDefaultOrgRef();

Clears the reactive ref without rewriting config. Use when the CLI already mutated config but the in-process ref must reset to notify observers (e.g., the source tracking status bar icons). See orgDeleteDefaultCommand for an example.

Complete Example Pattern

// services/extensionProvider.ts
import { buildAllServicesLayer } from '@salesforce/effect-ext-utils';

export let AllServicesLayer: ReturnType<typeof buildAllServicesLayer>;
export const setAllServicesLayer = (layer: ReturnType<typeof buildAllServicesLayer>) => {
  AllServicesLayer = layer;
};

// services/runtime.ts
import * as ManagedRuntime from 'effect/ManagedRuntime';
import { AllServicesLayer } from './extensionProvider';

const createRuntime = () => ManagedRuntime.make(AllServicesLayer);
let _runtime: ReturnType<typeof createRuntime> | undefined;
export const getRuntime = () => (_runtime ??= createRuntime());

// index.ts
import { buildAllServicesLayer } from '@salesforce/effect-ext-utils';
import { nls } from './messages';
import { myCommandEffect } from './commands/myCommand';
import { setAllServicesLayer } from './services/extensionProvider';
import { getRuntime } from './services/runtime';

export const activate = async (context: vscode.ExtensionContext) => {
  setAllServicesLayer(buildAllServicesLayer(context, nls.localize('channel_name')));
  await getRuntime().runPromise(activateEffect(context));
};

export const activateEffect = Effect.fn(`activation:${EXTENSION_NAME}`)(function* (_context: vscode.ExtensionContext) {
  const providerService = yield* ExtensionProviderService;
  const api = yield* providerService.getServicesApi;
  yield* api.services.ChannelService.appendToChannel('Extension activating');

  const registerCommand = api.services.registerCommandWithRuntime(getRuntime());
  yield* registerCommand('sf.my.command', myCommandEffect);

  yield* api.services.ChannelService.appendToChannel('Extension activation complete.');
});

Testing

Mock services via Layer.succeed and combine with Layer.mergeAll. For static accessors (e.g., api.services.WorkspaceService.getWorkspaceInfo()), wire both the provider and service:

import { ExtensionProviderService } from '@salesforce/effect-ext-utils';
import { WorkspaceService } from 'salesforcedx-vscode-services/src/vscode/workspaceService';
import * as Effect from 'effect/Effect';
import * as Layer from 'effect/Layer';

// Mock both ExtensionProviderService and WorkspaceService
const mockWorkspaceLayer = Layer.mergeAll(
  Layer.succeed(ExtensionProviderService, {
    getServicesApi: Effect.succeed({
      services: { WorkspaceService } // Accessor sees real class
    } as unknown as SalesforceVSCodeServicesApi)
  }),
  Layer.succeed(
    WorkspaceService,
    new WorkspaceService({
      getWorkspaceInfo: () => Effect.succeed({ path: '/mock', fsPath: '/mock', isEmpty: false, isVirtualFs: false, cwd: '/mock' }),
      getWorkspaceInfoOrThrow: () => Effect.succeed(/* ... */)
    } as unknown as WorkspaceService)
  )
);

// Use in test
const result = await Effect.runPromise(
  myEffect().pipe(Effect.provide(mockWorkspaceLayer))
);

For direct service mocking (no accessor), use Layer.succeed(Service, mockImpl) alone.

Common Patterns

• Start with api.services.prebuiltServicesLayer — don't add individual *.Default for services already there
• Only add per-extension layers on top
• import { ICONS } outside Effect; MediaService inside Effect
• ChannelServiceLayer before ErrorHandlerService
• Pass context to SdkLayerFor (extracts name/version from ExtensionContext)
• Effect.forkIn(..., yield* getExtensionScope()) for watcher cleanup on deactivation
• Scoped services own their VS Code disposables via finalizers; runtime disposal runs them
• registerCommandWithRuntime for all commands (tracing + error handling)
• Use getRuntime().runPromise / runFork instead of Effect.provide(AllServicesLayer) for execution

Don't: rebuild services already in prebuiltServicesLayer

// WRONG — creates new singleton instances, duplicating caches/watchers/state
return Layer.mergeAll(
  ExtensionProviderServiceLive,
  api.services.ExtensionContextServiceLayer(context),
  api.services.FsService.Default,           // ← already in prebuilt
  api.services.AliasService.Default,        // ← already in prebuilt
  api.services.SdkLayerFor(context),
  channelLayer,
  errorHandlerWithChannel
);

// CORRECT — share the already-built singletons
return Layer.mergeAll(
  api.services.prebuiltServicesLayer,
  ExtensionProviderServiceLive,
  api.services.ExtensionContextServiceLayer(context),
  api.services.SdkLayerFor(context),
  channelLayer,
  errorHandlerWithChannel
);

Review

Invoke the effect-advocate subagent on plans and diffs — its top-priority finding category is "you re-implemented something that already exists in salesforcedx-vscode-services."

prebuiltServicesLayer contains ~27 services built once during services extension activation. Calling .Default on any of them creates a second instance with its own caches, watchers, and state — silently breaking cross-extension sharing.