src/vs/workbench/services/configurationResolver/common/variableResolver.ts/AbstractVariableResolverService/resolveAsync
class AbstractVariableResolverService:	public async resolveAsync(root: IWorkspaceFolder | undefined, value: any): Promise<any> {
		return this.recursiveResolve(await this._envVariablesPromise, root ? root.uri : undefined, value);
	}