config

Category: universal
Path: universal/config/config
Archived from: openspec/archive/2026-04-24-enterprise-config/

Purpose

Layered configuration management for the Suaveplan monorepo. Five typed layers (defaults, file, object, env, CLI) are resolved in priority order, deep-merged, optionally validated via a caller-supplied Zod-compatible schema, and exposed through an immutable ConfigStore with hot-reload and subscription support.

Requirements

Constants

LAYER_PRIORITIES: { DEFAULTS: 0; FILE: 10; OBJECT: 20; ENV: 30; CLI: 40 }
MASK_STRING: "****"
TRUTHY_STRINGS: string[]
FALSY_STRINGS: string[]

Error Codes

Code	Severity	Retryable	Trigger
`CONFIG_MISSING`	`error`	`false`	Required config key not present
`CONFIG_INVALID_TYPE`	`error`	`false`	Value has wrong type
`CONFIG_PARSE_FAILED`	`error`	`false`	Layer resolution threw
`CONFIG_FILE_NOT_FOUND`	`error`	`false`	File layer content unavailable
`CONFIG_ENV_NOT_SET`	`error`	`false`	Required env var absent
`CONFIG_RELOAD_FAILED`	`error`	`true`	Reload aborted or layer re-resolution threw
`CONFIG_VALIDATION_FAILED`	`fatal`	`false`	Validator threw

Core API

class ConfigError extends SuaveplanError<ConfigPackageErrorCode>

function createConfig<T extends ConfigData>(options: CreateConfigOptions<T>): ConfigStore<T>

interface ConfigErrorDetail { path?: string; message: string }
interface MergeResult      { data: ConfigData; layers: ResolvedLayer[] }
interface ResolvedLayer    { name: string; priority: number; data: ConfigData }

Store

function createConfigStore<T extends ConfigData>(options: ConfigStoreOptions<T>): ConfigStore<T>

interface ConfigStoreOptions<T extends ConfigData = ConfigData> {
  data: T
  sensitive: string[]
}

interface ConfigStore<T extends ConfigData = ConfigData> {
  get<K extends string>(key: K): unknown
  has(key: string): boolean
  toJSON(): Readonly<T>
  toMasked(): Readonly<T>
  reload(signal?: AbortSignal): Promise<void>
  subscribe(listener: (next: Readonly<T>) => void): () => void
}

Layers

function defaultsLayer<T extends ConfigData>(defaults: T): ConfigLayer
function objectLayer(data: ConfigData, priority?: number): ConfigLayer
function envLayer(options: EnvLayerOptions): ConfigLayer
function fileLayer(options: FileLayerOptions): ConfigLayer
function cliLayer(options: CliLayerOptions): ConfigLayer
function parseArgs(args: string[], mapping: Record<string, string>): Record<string, string>

Types

type ConfigData = Record<string, unknown>

interface ConfigLayer {
  readonly name: string
  readonly priority: number
  resolve(): ConfigData
  teardown?(): void
}

type ConfigValidator<T extends ConfigData = ConfigData> = (data: ConfigData) => T

type EnvironmentOverrides<T extends ConfigData = ConfigData> = Record<string, Partial<T>>

interface CreateConfigOptions<T extends ConfigData = ConfigData> {
  layers: ConfigLayer[]
  validate?: ConfigValidator<T>
  sensitive?: string[]
  environments?: EnvironmentOverrides<T>
  environment?: string
  logger?: LoggerLike
}

interface EnvLayerOptions {
  prefix?: string
  mapping: Record<string, string>
  source?: Record<string, string | undefined>
}

interface CliLayerOptions {
  args: string[]
  mapping: Record<string, string>
}

interface FileLayerOptions {
  content: ConfigData
  watchBus?: EventBusLike
  watchEvent?: string
}

Utils

function deepMerge<T extends ConfigData>(base: T, override: Partial<T>): T
function mergeLayers(layers: Array<{ name: string; data: ConfigData }>): ConfigData
function getByPath(obj: ConfigData, path: string): unknown
function hasByPath(obj: ConfigData, path: string): boolean
function setByPath(obj: ConfigData, path: string, value: unknown): ConfigData
function maskSensitive(data: ConfigData, sensitive: string[], mask?: string): ConfigData
function coerceValue(raw: string): unknown

Zod Schemas

EnvLayerOptionsSchema
CliLayerOptionsSchema
FileLayerOptionsSchema
ConfigStoreOptionsSchema
CreateConfigOptionsSchema

OTel Instrumentation

Signal	Name	Attributes
Span	`config.create`	`config.layer_count`, `config.environment`
Counter	`config.get_total`	`config.hit` (bool)
Counter	`config.reload_total`	—
Histogram	`config.reload_duration_ms`	—
Histogram	`config.merge_duration_ms`	`config.layer_count`

Dependencies

Package	Role
`@suaveplan/error`	`SuaveplanError` base class, `defineCodes`
`@suaveplan/types`	`LoggerLike`, `EventBusLike`
`@suaveplan/events`	`EventBus` for file-layer watch mode
`@suaveplan/env`	`coerceValue` boolean/numeric token reference
`@opentelemetry/api`	OTel spans, counters, histograms
`zod`	Zod schemas for all public option types
`tslib`	TS runtime helpers

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