TSX

- tag based trees are pretty useful and broadly applicable
- full TSX support (no arbitrary XMLNS namespaces though)
- there are other ways of doing UI, but this is a pretty good one, and it's very familiar
- trees, generalised tree litearls,
- lowercase tree builders, ..?
- support both "Elements" (like <Panel />) and "fragments" (<div />)
- (unfortunately this also means keeping TS ambiguity around..)

- contextual TreeBuilder interface incl. string tags

- tree literals build through a contextual TreeBuilder
otherwise compiler.tree names the default builder as <specifier>#<export>
- lowercase tags are keys of the builder's Tags row and call its static element; fragments call its static fragment
- uppercase tags resolve ordinary lexical values: functions receive a props object, classes receive constructor props, and structs receive literal fields
- written and spread attributes merge under TSX rules; every required property must be present and every contributed property must exist on the target row
- children synthesize the children property and form a source-ordered tuple
- text remains a string literal and spread children must have statically known tuple length

export function Greeting({ name }: { name: string }) {
    return <h1>Hello, {name}!</h1>;
}