Code Block · astryx-svelte

Usage

CodeBlock renders syntax-highlighted code with line numbers, a copy button, and optional collapsible sections. Use CodeBlock for multi-line snippets like source files, terminal commands, and configuration examples. Use Code for inline references to function names, variables, or CLI flags within body text.

ts
 
import { CodeBlock } from '@astryx-svelte/core';

Best practices

Guidance	Practices
Do	Set the language prop to match the code content so syntax highlighting is accurate. Use "plaintext" when the language is unknown.
Do	Add a title when the code represents a file. It gives readers context and appears in the header bar alongside the copy button.
Do	Use Code for short inline references like function names or CLI flags, and CodeBlock for standalone multi-line snippets.
Don't	Enable line numbers on short snippets (under 5 lines) where they add clutter without helping navigation.
Don't	Nest a code block inside a scrollable container. Use the maxHeight prop instead, which handles overflow natively.

Examples

Common configurations, variations, and states.

Code — Snippet

Short terminal commands with a copy button and no line numbers. Use for install instructions or one-liner commands that readers will paste directly.

Code — Highlighted

TypeScript code with specific lines highlighted to draw attention to a key section. Use highlightLines to call out new or important code in tutorials and changelogs.

Code — Config

A JSON configuration file with a title bar and line numbers. The title prop adds a filename label in the header so readers know which file the code belongs to.

Code — Scrollable

A long code block with a max height that enables vertical scrolling. Use maxHeight to keep the block from dominating the page when displaying large files.

Code — Terminal

A dark terminal-style command block: a bash CodeBlock wrapped in SyntaxTheme with the GitHub Dark preset, copy button on, and no line numbers. Use for shell sessions or CLI output that should read as a terminal even on light pages. Reach for a dark syntax preset instead of hand-rolling a dark box with custom CSS.