# `lr-streaming-text-core` - **Import** `import '@aceshooting/lyra-ui/components/lr-streaming-text-core.js';` (stable tag alias; registers the tag) - **Class** `LyraStreamingTextCore`, also available unregistered from `@aceshooting/lyra-ui/components/conversation/streaming-text/streaming-text-core.class.js` - **Family** `components/conversation/` — see `llms/index.md` for its siblings - **Status** `experimental` since `16.0.0` — see the maturity and deprecation policy in `llms/shared.md` - **Release history** [CHANGELOG.md](../../CHANGELOG.md); family-wide breaking-change summaries: [llms-full.txt](../../llms-full.txt) - **Deprecations** none - **Optional peers** `dompurify`, `katex`, `marked`, `shiki` — see `llms/peers.md` - **Themeable via** 13 parts, 2 custom properties — see this component's own `@csspart`/`@cssprop` list below - **Library-wide behavior** (events, form association, `locale`/`strings`, tokens, TS types): `llms/shared.md` --- ## `lr-streaming-text-core` A build-lean `` variant for a consumer whose fenced-code `languages` map already covers every language it will ever stream, or who never renders fenced code at all. Every capability — token coalescing, `contentMode` auto-detection, the blinking cursor, the `lr-content-settled` event, the `languages` property, and the full forwarded Markdown configuration surface (`tabSize`, `htmlMode`, `gfm`, `linkTarget`, `internalLinkPrefix`, `headingOffset`, `highlightCode`, `headingAnchors`, `math`, `maxHeight`) — is identical to ``; only which Markdown element Markdown mode composes differs: this variant renders `` (`../markdown/markdown-core.js`) instead of ``, so importing this entry point instead of `streaming-text.js` never references ``'s ~200-language dynamic-import table at all. A fenced code block whose language isn't a key in `languages` always renders the plain-text fallback — there is no default/full-table highlighter here to fall back to, mirroring ``'s own contract. **Properties:** `content: string = ''` — the full current text so far, identical contract to ``'s own; `streaming: boolean = false` (reflected); `coalesceMs: number = 50` (attribute `coalesce-ms`) — same trailing-edge coalesce window described in `llms/components/lr-streaming-text.md`; `contentMode: StreamingTextContentMode = 'auto'` (attribute `content-mode`, reflected) — `auto` uses `looksLikeMarkdown`, `plain`/`markdown` force their named paths; `languages?: Readonly>` (property only) — forwarded verbatim to the composed ``'s own `languages` instead of ``'s (defaulting the composed element's own `languages` to `{}` when unset, unlike the full variant's `undefined`). The rest of ``'s configuration surface forwards verbatim too, sharing the same properties, attribute names, and defaults described under ``'s own **Properties** above: `tabSize: number = 4` (attribute `tab-size`); `htmlMode: 'sanitize' | 'escape' | 'trusted' = 'sanitize'` (attribute `html-mode`); `gfm: boolean = true`; `linkTarget: string | null = '_blank'` (attribute `link-target`, still guarded by the composed element's own `rel="noopener noreferrer"` whenever a `target` is emitted); `internalLinkPrefix: string = ''` (attribute `internal-link-prefix`); `headingOffset: number = 0` (attribute `heading-offset`); `highlightCode: boolean = true` (attribute `highlight-code`); `headingAnchors: boolean = false` (attribute `heading-anchors`); `math: boolean = false`; `maxHeight: string = ''` (attribute `max-height`). **Exported helper:** `looksLikeMarkdown(text: string): boolean` — the same standalone heuristic `` exports and documents, in `llms/components/lr-streaming-text.md`; both tags share one implementation. **Events:** `lr-content-settled` (`detail: null`, composed, bubbling) — identical contract to ``'s own, including the markdown-mode double-fire avoidance (here the composed `` emits it instead of ``). **Slots:** none — content renders from `content`, not a slot. **CSS parts:** `base`, `cursor` (only rendered while `streaming` is `true`), plus every part `` documents forwarded verbatim from the composed `` in Markdown mode via `exportparts`: `content`, `heading`, `paragraph`, `list`, `code-block`, `inline-code`, `link`, `table`, `blockquote`, `img`, `math` — the identical forwarded list `` documents, since `` and `` share the same documented part vocabulary. **Themeable custom properties:** `--lr-inline-cursor-width` (default `var(--lr-size-0-125rem)`) and `--lr-inline-cursor-height` (default `var(--lr-size-1em)`) — the same shared inline-cursor tokens ``/`` use, plus the same `--lr-space-xs`/ `--lr-transition-ambient` fallbacks described in `llms/components/lr-streaming-text.md`. Every other capability — token coalescing mechanics, the first-assignment/`streaming`-transition immediate-flush rules, the reduced-motion cursor degradation, and the known gotchas — is identical to ``; see `llms/components/lr-streaming-text.md` for the full write-up of shared behavior. ```html ``` ---