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.prebuiltServicesDependencies — pre-built Context.Context from services extension activation. Wrap with Layer.succeedContext(...).

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

Per-extension layers (must build yourself):

ExtensionContext Setup

Factory function building services layer with ExtensionContext:

export const buildAllServicesLayer = (context: ExtensionContext) =>
  Layer.unwrapEffect(
    Effect.gen(function* () {
      const extensionProvider = yield* ExtensionProviderService;
      const api = yield* extensionProvider.getServicesApi;
      const channelLayer = api.services.ChannelServiceLayer(
        context.extension.packageJSON.displayName ?? 'My Extension'
      );
      const errorHandlerWithChannel = Layer.provide(api.services.ErrorHandlerService.Default, channelLayer);

      return Layer.mergeAll(
        Layer.succeedContext(api.services.prebuiltServicesDependencies),
        ExtensionProviderServiceLive,
        errorHandlerWithChannel,
        api.services.ExtensionContextServiceLayer(context),
        api.services.SdkLayerFor(context),
        channelLayer
      );
    }).pipe(Effect.provide(ExtensionProviderServiceLive))
  );

In activate:

export const activate = async (context: vscode.ExtensionContext): Promise<void> => {
  const extensionScope = Effect.runSync(getExtensionScope());
  setAllServicesLayer(buildAllServicesLayer(context));
  await getRuntime().runPromise(activateEffect(context).pipe(Scope.extend(extensionScope)));
};

Runtime vs provide

• Do: Build ManagedRuntime.make(AllServicesLayer) and export getRuntime().
• Do: Use getRuntime().runPromise(effect) / runFork(effect) for ad-hoc execution.
• Don't: Use Effect.provide(AllServicesLayer) at call sites — use the runtime instead.
• Exception: registerCommandWithLayer(AllServicesLayer) — keep passing the Layer; it internally uses provide.

Registering Commands

Use registerCommandWithLayer (for layers) or registerCommandWithRuntime (for runtimes):

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

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

// Using Layer
const registerCommand = api.services.registerCommandWithLayer(AllServicesLayer);
yield * registerCommand('sf.my.command', myCommandEffect);

// Using Runtime
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

Basic Services

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

• ChannelService - Output channel
• 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) and uri/path conversion
• EditorService - Active editor changes and current URI
• Prompts - QuickPick, InputBox, and UserCancellationError handling

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;
const dequeue = yield * PubSub.subscribe(fileWatcher.pubsub);

yield *
  Stream.fromQueue(dequeue).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.
    })
  );

Complete Example Pattern

// extensionProvider.ts
import * as ManagedRuntime from 'effect/ManagedRuntime';

export const buildAllServicesLayer = (context: ExtensionContext) =>
  Layer.unwrapEffect(
    Effect.gen(function* () {
      const extensionProvider = yield* ExtensionProviderService;
      const api = yield* extensionProvider.getServicesApi;
      const channelLayer = api.services.ChannelServiceLayer(
        context.extension.packageJSON.displayName ?? 'My Extension'
      );
      const errorHandlerWithChannel = Layer.provide(api.services.ErrorHandlerService.Default, channelLayer);

      return Layer.mergeAll(
        Layer.succeedContext(api.services.prebuiltServicesDependencies),
        ExtensionProviderServiceLive,
        errorHandlerWithChannel,
        api.services.ExtensionContextServiceLayer(context),
        api.services.SdkLayerFor(context),
        channelLayer
      );
    }).pipe(Effect.provide(ExtensionProviderServiceLive))
  );

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

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

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

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

  const registerCommand = api.services.registerCommandWithLayer(AllServicesLayer);

  yield* registerCommand('sf.my.command', myCommandEffect);

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

Common Patterns

• Start with Layer.succeedContext(api.services.prebuiltServicesDependencies) — 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
• registerCommandWithLayer for all commands (tracing + error handling)
• Use getRuntime().runPromise / runFork instead of Effect.provide(AllServicesLayer) for execution

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