Runtime-agnostic JS utils for detecting environments, runtimes, CI providers, and AI coding agents.

Detects the current JavaScript runtime based on global variables, following the WinterCG Runtime Keys proposal.

import { runtime, runtimeInfo } from "std-env";

console.log(runtime); // "" | "node" | "deno" | "bun" | "workerd" ...
console.log(runtimeInfo); // { name: "node" }

Individual named exports: isNode, isBun, isDeno, isNetlify, isEdgeLight, isWorkerd, isFastly

See ./src/runtimes.ts for the full list.

Detects the current CI/CD provider based on environment variables.

import { isCI, provider, providerInfo } from "std-env";

console.log({ isCI, provider, providerInfo });
// { isCI: true, provider: "github_actions", providerInfo: { name: "github_actions", isCI: true } }

Use detectProvider() to re-run detection. See ./src/providers.ts for the full list.

Detects if the environment is running inside an AI coding agent.

import { isAgent, agent, agentInfo } from "std-env";

console.log({ isAgent, agent, agentInfo });
// { isAgent: true, agent: "claude", agentInfo: { name: "claude" } }

Set the AI_AGENT env var to explicitly specify the agent name. Use detectAgent() to re-run detection.

Supported agents: cursor, claude, devin, replit, gemini, codex, auggie, opencode, kiro, goose, pi

import { env, isDevelopment, isProduction } from "std-env";

See ./src/flags.ts for details.

MIT