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# Standard library
Deno provides a set of standard modules that are audited by the core team and
are guaranteed to work with Deno.
Standard library is available at: https://deno.land/std/
## Versioning and stability
Standard library is not yet stable and therefore it is versioned differently
than Deno. For latest release consult https://deno.land/std/ or
https://deno.land/std/version.ts.
We strongly suggest to always use imports with pinned version of standard
library to avoid unintended changes.
## Troubleshooting
Some of the modules provided in standard library use unstable Deno APIs.
Trying to run such modules without `--unstable` CLI flag ends up with a lot of
TypeScript errors suggesting that some APIs on `Deno` namespace do not exist:
```typescript
// main.ts
import { copy } from "https://deno.land/std@0.50.0/fs/copy.ts";
copy("log.txt", "log-old.txt");
```
```shell
$ deno run --allow-read --allow-write main.ts
Compile file:///dev/deno/main.ts
Download https://deno.land/std@0.50.0/fs/copy.ts
Download https://deno.land/std@0.50.0/fs/ensure_dir.ts
Download https://deno.land/std@0.50.0/fs/_util.ts
error: TS2339 [ERROR]: Property 'utime' does not exist on type 'typeof Deno'.
await Deno.utime(dest, statInfo.atime, statInfo.mtime);
~~~~~
at https://deno.land/std@0.50.0/fs/copy.ts:90:16
TS2339 [ERROR]: Property 'utimeSync' does not exist on type 'typeof Deno'.
Deno.utimeSync(dest, statInfo.atime, statInfo.mtime);
~~~~~~~~~
at https://deno.land/std@0.50.0/fs/copy.ts:101:10
```
Solution to that problem requires adding `--unstable` flag:
```shell
$ deno run --allow-read --allow-write --unstable main.ts
```
To make sure that API producing error is unstable check
[`lib.deno.unstable.d.ts`](https://github.com/denoland/deno/blob/master/cli/js/lib.deno.unstable.d.ts)
declaration.
This problem should be fixed in the near future.
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