Method setOverride

src/node/services/experimentsService.ts:140–175

(
    experimentId: ExperimentId,
    enabled: boolean | null | undefined
  )

  }

  async setOverride(
    experimentId: ExperimentId,
    enabled: boolean | null | undefined
  ): Promise<void> {
    await this.ensureInitialized();
    assert(experimentId in EXPERIMENTS, `Unknown experimentId: ${experimentId}`);
    assert(
      EXPERIMENTS[experimentId].userOverridable === true,
      `Experiment ${experimentId} does not support user overrides`
    );
    assert(
      enabled == null || typeof enabled === "boolean",
      `Experiment override for ${experimentId} must be boolean | null | undefined`
    );

    if (!this.isExperimentSupported(experimentId)) {
      this.overrides.delete(experimentId);
      this.telemetryService.setFeatureFlagVariant(this.getFlagKey(experimentId), null);
      await this.writeCacheToDisk();
      return;
    }

    if (enabled == null) {
      this.overrides.delete(experimentId);
      const cached = this.cachedVariants.get(experimentId);
      this.telemetryService.setFeatureFlagVariant(
        this.getFlagKey(experimentId),
        cached?.value ?? null
      );
    } else {
      this.overrides.set(experimentId, enabled);
      this.telemetryService.setFeatureFlagVariant(this.getFlagKey(experimentId), enabled);
    }

    await this.writeCacheToDisk();
  }

  getExperimentValue(experimentId: ExperimentId): ExperimentValue {
    assert(experimentId in EXPERIMENTS, `Unknown experimentId: ${experimentId}`);