Function pushMeta

packages/react-dom-bindings/src/server/ReactFizzConfigDOM.js:2789–2848

(
  target: Array<Chunk | PrecomputedChunk>,
  props: Object,
  renderState: RenderState,
  textEmbedded: boolean,
  formatContext: FormatContext,
)

}

function pushMeta(
  target: Array<Chunk | PrecomputedChunk>,
  props: Object,
  renderState: RenderState,
  textEmbedded: boolean,
  formatContext: FormatContext,
): null {
  const noscriptTagInScope = formatContext.tagScope & NOSCRIPT_SCOPE;
  const isFallback = formatContext.tagScope & FALLBACK_SCOPE;
  if (
    formatContext.insertionMode === SVG_MODE ||
    noscriptTagInScope ||
    props.itemProp != null
  ) {
    return pushSelfClosing(target, props, 'meta', formatContext);
  } else {
    if (textEmbedded) {
      // This link follows text but we aren't writing a tag. while not as efficient as possible we need
      // to be safe and assume text will follow by inserting a textSeparator
      target.push(textSeparator);
    }

    if (isFallback) {
      // Hoistable Elements for fallbacks are simply omitted. we don't want to emit them early
      // because they are likely superceded by primary content and we want to avoid needing to clean
      // them up when the primary content is ready. They are never hydrated on the client anyway because
      // boundaries in fallback are awaited or client render, in either case there is never hydration
      return null;
    } else if (typeof props.charSet === 'string') {
      // "charset" Should really be config and not picked up from tags however since this is
      // the only way to embed the tag today we flush it on a special queue on the Request so it
      // can go before everything else. Like viewport this means that the tag will escape it's
      // parent container.
      return pushSelfClosing(
        renderState.charsetChunks,
        props,
        'meta',
        formatContext,
      );
    } else if (props.name === 'viewport') {
      // "viewport" is flushed on the Request so it can go earlier that Float resources that
      // might be affected by it. This means it can escape the boundary it is rendered within.
      // This is a pragmatic solution to viewport being incredibly sensitive to document order
      // without requiring all hoistables to be flushed too early.
      return pushSelfClosing(
        renderState.viewportChunks,
        props,
        'meta',
        formatContext,
      );
    } else {
      return pushSelfClosing(
        renderState.hoistableChunks,
        props,
        'meta',
        formatContext,
      );
    }