Markdown

Experimental. The API may still change in a future release.

<script setup lang="ts">
import { MtMarkdown } from "@shopware-ag/meteor-component-library";

const answer = `## Low stock

Three products are below a stock of 5. The **linen cushion** is sold out.

| Product | Number | Stock |
| :-- | :-- | --: |
| Desk lamp, brass | SW-1000 | 2 |
| Linen cushion | SW-1012 | 0 |
| Ceramic vase | SW-1025 | 4 |

### Next steps

1. Reorder the cushion from the supplier.
2. Raise the stock once the delivery arrives:

\`\`\`sh
curl -X PATCH https://shop.example.com/api/product/SW-1012 -d '{ "stock": 40 }'
\`\`\`

See the [stock documentation](https://docs.shopware.com) for details.`;
</script>

<template>
  <mt-markdown :content="answer" />
</template>

Usage

Markdown renders a Markdown string, typically the answer of an AI model, with headings, lists, tables, code blocks and links in Meteor's typography. Use it wherever Markdown arrives as text, and set streaming while the text is still arriving.

It supports GitHub Flavored Markdown: tables, task lists, strikethrough and links written as bare addresses. Raw HTML in the content shows as text.

import { MtMarkdown } from "@shopware-ag/meteor-component-library";

Examples

Streaming

Pass the text as it arrives and set streaming until the answer is complete. The text still appears word by word, but only once it renders as it will in the finished answer, so raw Markdown never flashes while the answer streams.

<script setup lang="ts">
import { onBeforeUnmount, onMounted, ref } from "vue";
import { MtButton, MtCard, MtMarkdown } from "@shopware-ag/meteor-component-library";

const answer = `Two products need attention:

- **Desk lamp, brass** has a stock of *2*.
- **Linen cushion** is sold out.

| Product | Stock |
| :-- | --: |
| Desk lamp, brass | 2 |
| Linen cushion | 0 |

\`\`\`json
{ "productNumber": "SW-1012", "stock": 40 }
\`\`\``;

const content = ref("");
const streaming = ref(false);

let timer: ReturnType<typeof setInterval> | undefined;

function stop() {
  clearInterval(timer);
  streaming.value = false;
}

// Adds a few characters at a time, as a model's answer arrives.
function play() {
  stop();
  content.value = "";
  streaming.value = true;

  timer = setInterval(() => {
    content.value = answer.slice(0, content.value.length + 4);
    if (content.value.length === answer.length) stop();
  }, 40);
}

onMounted(play);
onBeforeUnmount(stop);
</script>

<template>
  <mt-card title="Stock check">
    <template #headerRight>
      <mt-button variant="secondary" :disabled="streaming" @click="play">Replay</mt-button>
    </template>

    <mt-markdown :content="content" :streaming="streaming" />
  </mt-card>
</template>

Images

No image loads unless its address starts with one of allowed-image-prefixes. Other images show as a link to the image.

<script setup lang="ts">
import { MtMarkdown } from "@shopware-ag/meteor-component-library";

const answer = `This is the product photo from your media library:

![The product photo](https://meteor.shopware.com/showcase-product.jpg)

An image from anywhere else shows as a link: ![A photo from another site](https://images.example.com/lamp.png)`;
</script>

<template>
  <mt-markdown :content="answer" :allowed-image-prefixes="['https://meteor.shopware.com/']" />
</template>

API reference

Props

Prop	Type	Default
`content` * The Markdown, including tables, task lists, strikethrough and autolinks.	`string`
`streaming` Whether the content is still arriving. Only what already renders as in the finished text shows: syntax without content yet, such as `` or `##`, waits for it, a table appears with its header and first row and then row by row, and unfinished emphasis such as `bold` renders as if it were complete. A code block that is still being written has no copy button yet.	`false \| true`	`false`
`allowed-image-prefixes` The https addresses that images may load from, such as `https://cdn.example.com/media/`. Other images show as a link. No image loads by default, because the address of an image in a model's answer can carry data out of the conversation.	`string[]`	`[]`

Best practices

Use it for text that arrives as Markdown, such as an AI answer, and keep streaming set until the answer is complete.
Allow images only from addresses you control, such as your own media storage, and end each prefix with /.

Don't

Do not convert Markdown to HTML yourself and insert it with v-html; that bypasses the security checks.
Do not use it for text that the user edits; use Text Editor instead.
Do not wrap it in Text; it sets its own typography, and its blocks can't sit inside a paragraph.
Do not set streaming on text that is already complete; it may change how an unfinished construct at the end renders.

Behavior

Streaming

With streaming, only what already renders as in the finished answer shows. Once streaming is off, the complete text renders unchanged.
Syntax at the end that has nothing to format yet, such as **, ##, - or - [x], waits until its content arrives. Punctuation at the very end can still be the start of syntax, so it appears with the next part of the answer.
Emphasis, inline code and strikethrough that already have content render as if they were complete. A link whose address is still arriving shows as text, and an image whose address is still arriving is left out.
A table appears with its header and first row, then row by row.
A code block without its closing fence renders as a code block up to the end of the text. Its copy button appears once the next block starts or the answer is complete.
Blocks that are finished don't render again while the answer grows, so long answers stay fast.
Three constructs only resolve with text that comes later, and models rarely write them. Tables whose rows don't start with | show their first line as text until the delimiter row arrives. Headings underlined with === or --- show as a paragraph until the next block starts. Reference links like [text][1] show as text until their definition arrives.

Content

Line breaks follow CommonMark, as on GitHub: a single line break inside a paragraph becomes a space. End a line with two spaces or a backslash for a hard break.
Common named character references, such as & and  , are decoded, except in code.
Each code block has a button that copies its code. The language from the opening fence is added to the code as a language-* class.

Security

The content is treated as untrusted, because a model's answer can be influenced by the data it reads.

Raw HTML, such as <script> or <img onerror>, shows as text. The only exception is <br>, which becomes a line break, because models often write it into table cells.
Links only use http, https, mailto and tel, or have no scheme, like /orders or #top. Links with any other scheme, such as javascript:, show as text. Links with a full http or https address open in a new tab, without access to the page that opened them.
Images load only from https addresses that start with one of allowed-image-prefixes. The address of an image loads without a click, so an image in an answer could otherwise send data from the conversation to another server.

Accessibility

The content renders as semantic HTML: headings, lists, tables with column headers, quotes and code. Models choose heading levels themselves, so place the component where any heading level is acceptable.
A wide table or code block scrolls horizontally inside its own box instead of widening the page.
The copy button of a code block has an accessible name, which changes to "Copied" after copying. It is hidden until the code block is hovered or focused, and always visible on touch screens.
Task list checkboxes are disabled, because they show a state and can't be changed.

Text: for plain text that contains no Markdown.
Text Editor: for rich text that users write and edit.

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