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76 lines
2.7 KiB
Markdown
76 lines
2.7 KiB
Markdown
# Standard library
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Deno provides a set of standard modules that are audited by the core team and
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are guaranteed to work with Deno.
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Standard library is available at: https://deno.land/std/
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## Versioning and stability
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Standard library is not yet stable and therefore it is versioned differently
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than Deno. For latest release consult https://deno.land/std/ or
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https://deno.land/std/version.ts. The standard library is released each time
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Deno is released.
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We strongly suggest to always use imports with pinned version of standard
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library to avoid unintended changes. For example, rather than linking to the
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default branch of code, which may change at any time, potentially causing
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compilation errors or unexpected behavior:
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```typescript
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// import the latest release, this should be avoided
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import { copy } from "https://deno.land/std/fs/copy.ts";
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```
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instead, used a version of the std library which is immutable and will not
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change:
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```typescript
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// imports from v$STD_VERSION of std, never changes
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import { copy } from "https://deno.land/std@$STD_VERSION/fs/copy.ts";
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```
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## Troubleshooting
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Some of the modules provided in standard library use unstable Deno APIs.
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Trying to run such modules without `--unstable` CLI flag ends up with a lot of
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TypeScript errors suggesting that some APIs in the `Deno` namespace do not
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exist:
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```typescript
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// main.ts
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import { copy } from "https://deno.land/std@$STD_VERSION/fs/copy.ts";
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copy("log.txt", "log-old.txt");
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```
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```shell
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$ deno run --allow-read --allow-write main.ts
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Compile file:///dev/deno/main.ts
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Download https://deno.land/std@$STD_VERSION/fs/copy.ts
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Download https://deno.land/std@$STD_VERSION/fs/ensure_dir.ts
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Download https://deno.land/std@$STD_VERSION/fs/_util.ts
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error: TS2339 [ERROR]: Property 'utime' does not exist on type 'typeof Deno'. 'Deno.utime' is an unstable API. Did you forget to run with the '--unstable' flag?
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await Deno.utime(dest, statInfo.atime, statInfo.mtime);
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~~~~~
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at https://deno.land/std@$STD_VERSION/fs/copy.ts:92:16
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TS2339 [ERROR]: Property 'utimeSync' does not exist on type 'typeof Deno'. 'Deno.utimeSync' is an unstable API. Did you forget to run with the '--unstable' flag?
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Deno.utimeSync(dest, statInfo.atime, statInfo.mtime);
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~~~~~~~~~
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at https://deno.land/std@$STD_VERSION/fs/copy.ts:103:10
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```
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Solution to that problem requires adding `--unstable` flag:
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```shell
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deno run --allow-read --allow-write --unstable main.ts
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```
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To make sure that API producing error is unstable check
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[`lib.deno.unstable.d.ts`](https://github.com/denoland/deno/blob/$CLI_VERSION/cli/dts/lib.deno.unstable.d.ts)
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declaration.
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This problem should be fixed in the near future. Feel free to omit the flag if
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the particular modules you depend on compile successfully without it.
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