### Package Structure Example

Source: https://github.com/denoland/std/blob/main/AGENTS.md

Illustrates the standard directory structure for each package within the Deno Standard Library.

```plaintext
<package>/
├── deno.json              # Name (@std/<package>), version, exports
├── mod.ts                 # Public entry point
├── <api>.ts               # Implementation (one function/class per file)
├── <api>_test.ts          # Tests for the corresponding source file
└── unstable_<api>.ts      # Experimental APIs (stable packages only)
```

--------------------------------

### Deprecated API Example

Source: https://github.com/denoland/std/blob/main/AGENTS.md

Shows the TSDoc format for marking deprecated APIs, including information on removal and alternatives.

```typescript
/**
 * @deprecated This will be removed in X.Y.Z. Use {@linkcode bar} instead.
 */
```

--------------------------------

### PR Title Format Example

Source: https://github.com/denoland/std/blob/main/AGENTS.md

Demonstrates the required semantic commit message format for Pull Requests, including a package scope.

```plaintext
feat(http): add streaming response support
fix(csv): handle escaped quotes correctly
docs(fmt): update docstrings
deprecation(encoding): base32hex
```

--------------------------------

### Testing Intervals with FakeTime

Source: https://github.com/denoland/std/blob/main/testing/README.md

This example demonstrates how to test interval functions using FakeTime to control time progression. It asserts that a callback is invoked at expected intervals and stops after clearInterval is called.

```typescript
import { assertSpyCalls, spy } from "@std/testing/mock";
import { FakeTime } from "@std/testing/time";

function secondInterval(cb: () => void) {
  return setInterval(cb, 1000);
}

Deno.test("secondInterval calls callback every second and stops after being cleared", () => {
  using time = new FakeTime();

  const cb = spy();
  const intervalId = secondInterval(cb);
  assertSpyCalls(cb, 0);
  time.tick(500);
  assertSpyCalls(cb, 0);
  time.tick(500);
  assertSpyCalls(cb, 1);
  time.tick(3500);
  assertSpyCalls(cb, 4);

  clearInterval(intervalId);
  time.tick(1000);
  assertSpyCalls(cb, 4);
});

```

--------------------------------

### Build Crypto WASM Module

Source: https://github.com/denoland/std/blob/main/crypto/_wasm/README.md

Run this command to regenerate the WASM files from the Rust source code. This command places the generated files in the `./lib/` directory.

```sh
deno task build:crypto
```

--------------------------------

### Format Bytes to Human-Readable String

Source: https://github.com/denoland/std/blob/main/fmt/README.md

Use the `format` function from `@std/fmt/bytes` to convert byte counts into human-readable strings with appropriate units (e.g., kB, MB). The output is styled red using `@std/fmt/colors`.

```typescript
import { format } from "@std/fmt/bytes";
import { red } from "@std/fmt/colors";

console.log(red(format(1337))); // Prints "1.34 kB"
```

--------------------------------

### Generate Root Certificate Authority (CA)

Source: https://github.com/denoland/std/blob/main/http/testdata/tls/README.md

Creates a self-signed root CA certificate and private key. This CA will be used to sign other certificates.

```shell
openssl req -x509 -nodes -new -sha256 -days 36135 -newkey rsa:2048 -keyout RootCA.key -out RootCA.pem -subj "/C=US/CN=Example-Root-CA"
openssl x509 -outform pem -in RootCA.pem -out RootCA.crt
```

--------------------------------

### Badge Markdown for Deno Standard Library

Source: https://github.com/denoland/std/blob/main/README.md

This Markdown snippet can be used to display a badge indicating a project is built with the Deno Standard Library. It links to the JSR package page.

```markdown
[![Built with the Deno Standard Library](https://img.shields.io/badge/Built_with_std-black?logo=deno)](https://jsr.io/@std)
```

--------------------------------

### Configure Domain Names for Certificate

Source: https://github.com/denoland/std/blob/main/http/testdata/tls/README.md

Defines the domain names that will be included in the certificate's Subject Alternative Name (SAN) field. This file is used by OpenSSL during certificate generation.

```text
authorityKeyIdentifier=keyid,issuer
basicConstraints=CA:FALSE
keyUsage = digitalSignature, nonRepudiation, keyEncipherment, dataEncipherment
subjectAltName = @alt_names
[alt_names]
DNS.1 = localhost
```

--------------------------------

### Generate Domain Certificate Signed by Root CA

Source: https://github.com/denoland/std/blob/main/http/testdata/tls/README.md

Generates a private key, a Certificate Signing Request (CSR), and finally a domain certificate signed by the previously created Root CA. It uses the domain configuration file for Subject Alternative Names.

```shell
openssl req -new -nodes -newkey rsa:2048 -keyout localhost.key -out localhost.csr -subj "/C=US/ST=YourState/L=YourCity/O=Example-Certificates/CN=localhost.local"
openssl x509 -req -sha256 -days 36135 -in localhost.csr -CA RootCA.pem -CAkey RootCA.key -CAcreateserial -extfile domains.txt -out localhost.crt
```

--------------------------------

### Badge SVG for Deno Standard Library

Source: https://github.com/denoland/std/blob/main/README.md

This HTML snippet can be used to display a badge indicating a project is built with the Deno Standard Library. It links to the JSR package page.

```html
<a href="https://jsr.io/@std">
  <img
    width="135"
    height="20"
    src="https://img.shields.io/badge/Built_with_std-black?logo=deno"
    alt="Built with the Deno Standard Library"
  />
</a>
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.