| 1 | --- |
| 2 | depends: |
| 3 | - guide/syntax#code-block |
| 4 | tags: [codeblock] |
| 5 | description: | |
| 6 | Enable line numbering for all code blocks across the slides or individually. |
| 7 | --- |
| 8 | |
| 9 | # Line Numbers |
| 10 | |
| 11 | You can enable line numbering for all code blocks across the slides by setting `lineNumbers: true` in the headmatter, or enable each code block individually by setting `lines: true`. |
| 12 | |
| 13 | You can also set the starting line for each code block and highlight the lines accordingly via `{startLine: number}`, which defaults to 1. |
| 14 | |
| 15 | ````md |
| 16 | ```ts {6,7}{lines:true,startLine:5} |
| 17 | function add( |
| 18 | a: Ref<number> | number, |
| 19 | b: Ref<number> | number |
| 20 | ) { |
| 21 | return computed(() => unref(a) + unref(b)) |
| 22 | } |
| 23 | ``` |
| 24 | ```` |
| 25 | |
| 26 | Note that you can use `{*}` as a placeholder of <LinkInline link="features/line-highlighting" />: |
| 27 | |
| 28 | ````md |
| 29 | ```ts {*}{lines:true,startLine:5} |
| 30 | // ... |
| 31 | ``` |
| 32 | ```` |
| 33 |