src/vs/workbench/services/configuration/browser/configuration.ts/DefaultConfiguration/initializeCachedConfigurationDefaultsOverrides
class DefaultConfiguration:	private initializeCachedConfigurationDefaultsOverrides(): Promise<void> {
		if (!this.initiaizeCachedConfigurationDefaultsOverridesPromise) {
			this.initiaizeCachedConfigurationDefaultsOverridesPromise = (async () => {
				try {
					// Read only when the cache exists
					if (window.localStorage.getItem(DefaultConfiguration.DEFAULT_OVERRIDES_CACHE_EXISTS_KEY)) {
						const content = await this.configurationCache.read(this.cacheKey);
						if (content) {
							this.cachedConfigurationDefaultsOverrides = JSON.parse(content);
						}
					}
				} catch (error) { /* ignore */ }
				this.cachedConfigurationDefaultsOverrides = isObject(this.cachedConfigurationDefaultsOverrides) ? this.cachedConfigurationDefaultsOverrides : {};
			})();
		}
		return this.initiaizeCachedConfigurationDefaultsOverridesPromise;
	}