Opinionated standard library for Webiny. This is an internal package — we make breaking changes freely and do not follow semver for external consumers.
Services are built on a lightweight dependency injection system. Each feature follows the same three-layer pattern: an abstraction (DI token + interface), an implementation (concrete class), and a feature (registers the implementation in the DI container). This keeps code testable and lets different environments (Node.js, browser) swap implementations behind the same interface.
The package is ESM-only and ships three subpath exports. Because each is a separate entry point, Node.js-specific code is never bundled into a browser build and vice versa — unless you explicitly import the wrong subpath.
| Import | Environment | Description |
|---|---|---|
@webiny/stdlib |
Any | Platform-agnostic utilities |
@webiny/stdlib/node |
Node.js | Node.js-specific tools |
@webiny/stdlib/browser |
Browser | Browser-specific tools |
@webiny/stdlib/mcp |
Node.js | MCP server + agent config |
| Feature | Description |
|---|---|
Result / ResultAsync |
Typed success/failure values — synchronous and async |
BaseError |
Abstract base class for typed domain errors |
Logger / ConsoleLogger / ConsoleLoggerFeature |
Logging abstraction + console implementation — docs |
Cache / MemoryCacheFeature |
Synchronous key-value cache — docs |
AsyncCache / AsyncMemoryCacheFeature |
Async key-value cache — docs |
immutableGet / immutableSet / immutableDelete / mutableSet / mutableDelete |
Dot-notation get/set/delete on nested objects — docs |
toBoolean / isTruthy / isFalsy |
Semantic boolean coercion — docs |
uuid |
RFC 4122 v4 UUID generator (native + fallback) — docs |
mdbid |
MongoDB-compatible ObjectId generator — docs |
generateId / generateAlphaNumericId / generateAlphaLowerCaseId / ... |
Nanoid-based ID generators with configurable alphabets — docs |
Env |
Typed environment variable access (abstraction) — docs |
| Feature | Description |
|---|---|
FileTool / FileToolFeature |
Read, write, copy, remove files — docs |
DirectoryTool / DirectoryToolFeature |
Create, read, remove, copy, glob directories — docs |
JsonFileTool / JsonFileToolFeature |
Read and write JSON files with optional schema validation — docs |
PathTool / PathToolFeature |
node:path wrapper + resolvePackageFile for package-relative paths — docs |
PinoLogger / PinoLoggerFeature |
pino-based Logger implementation — docs |
NdJsonReaderTool / NdJsonReaderToolFeature |
Parse NDJSON from files, streams, or in-memory lines with checkpoint support — docs |
ReadStreamFactory / ReadStreamFactoryFeature |
node:fs read streams with explicit destroy() cleanup — docs |
PackageJsonFileTool / PackageJsonFileToolFeature |
Read, validate, mutate, and write package.json files — docs |
HashFolderTool / HashFolderToolFeature |
Deterministic SHA-256 hash of a folder's contents — docs |
ProcessEnvFeature |
Env implementation backed by process.env — docs |
WorkspaceTool / WorkspaceToolFeature |
Discover workspaces from root package.json (replaces get-yarn-workspaces) — docs |
GlobTool / GlobToolFeature |
Find files and directories by glob pattern — docs |
| Feature | Description |
|---|---|
LocalStorageCacheFeature |
Cache implementation backed by window.localStorage — docs |
BrowserEnvFeature |
Env implementation backed by an injected variables object — docs |
An MCP server that exposes @webiny/stdlib feature documentation as tools for AI agent discovery. Ships a CLI binary (stdlib-mcp) with two commands:
# Start the MCP server (stdio transport)
npx -y @webiny/stdlib stdlib-mcp serve
# Configure an AI agent (Claude Code, Cursor, Cline, Copilot, Windsurf, Kiro, OpenCode)
npx -y @webiny/stdlib stdlib-mcp configureThe server provides two MCP tools: list_stdlib_skills (grouped catalog of all features) and get_stdlib_skill (full documentation for a specific skill). By default it scans skills/ and src/ (or dist/) for README.md and SKILL.md files with YAML front-matter.
| Feature | Description |
|---|---|
McpServer / McpServerFeature |
MCP server with stdio transport — docs |
SkillDiscovery / SkillDiscoveryConfig |
Scans directories for skill files with front-matter — docs |
AgentConfigurator / AgentConfiguratorFeature |
Interactive CLI to configure AI agents — docs |
Versioning and publishing are managed by Changesets. The version in package.json is the real published version, bumped automatically when a version PR is merged. To record a version bump, run yarn changeset before opening a PR. There are no major version bumps — breaking changes may land on minor releases.