std-env
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Runtime agnostic JS utils
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# std-env
[](http://npmjs.com/package/std-env)
[](http://npmjs.com/package/std-env)
[](https://bundlephobia.com/result?p=std-env)
Runtime-agnostic JS utils for detecting environments, runtimes, CI providers, and AI coding agents.
## Runtime Detection
Detects the current JavaScript runtime based on global variables, following the [WinterCG Runtime Keys proposal](https://runtime-keys.proposal.wintercg.org/).
```ts
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`
> [!NOTE]
> `isNode` is also `true` in Bun/Deno with Node.js compatibility mode. Use `runtime === "node"` for strict checks.
See [./src/runtimes.ts](./src/runtimes.ts) for the full list.
## Provider Detection
Detects the current CI/CD provider based on environment variables.
```ts
import { isCI, provider, providerInfo } from "std-env";
console.log({ isCI, provider, providerInfo });
// { isCI: true, provider: "github_actions", providerInfo: { name: "github_actions", ci: true } }
```
Use `detectProvider()` to re-run detection. See [./src/providers.ts](./src/providers.ts) for the full list.
## Agent Detection
Detects if the environment is running inside an AI coding agent.
```ts
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`
## Flags
```js
import { env, isDevelopment, isProduction } from "std-env";
```
| Export | Description |
| ------------------ | ------------------------------------------------------------ |
| `hasTTY` | stdout TTY is available |
| `hasWindow` | Global `window` is available |
| `isCI` | Running in CI |
| `isColorSupported` | Terminal color output supported |
| `isDebug` | `DEBUG` env var is set |
| `isDevelopment` | `NODE_ENV` is `dev`/`development` or `MODE` is `development` |
| `isLinux` | Linux platform |
| `isMacOS` | macOS (darwin) platform |
| `isMinimal` | `MINIMAL` env is set, CI, test, or no TTY |
| `isProduction` | `NODE_ENV` or `MODE` is `production` |
| `isTest` | `NODE_ENV` is `test` or `TEST` env is set |
| `isWindows` | Windows platform |
| `platform` | Value of `process.platform` |
| `nodeVersion` | Node.js version string (e.g. `"22.0.0"`) |
| `nodeMajorVersion` | Node.js major version number (e.g. `22`) |
See [./src/flags.ts](./src/flags.ts) for details.
## Environment
| Export | Description |
| --------- | ---------------------------------------------------- |
| `env` | Universal `process.env` (works across all runtimes) |
| `process` | Universal `process` shim (works across all runtimes) |
| `nodeENV` | Current `NODE_ENV` value (undefined if unset) |
## License
MIT