Coming from Marko 5

If Marko 5 was your home, here’s the moving guide — every familiar tool and where it went. (New to Marko entirely? This lesson is a free review in disguise.)

out → gone as an object. Its one survivor is out.global, now spelled $global — render globals, which part five covers properly.

this.emit("save", data) → pass a function: <child onSave=...>, child calls input.onSave(data). Handlers are plain values now — spreadable, refactorable, no event names.

Component instances & refs (this.getComponent(...)) → there are no instances. Children expose values with <return>; elements expose themselves via tag variables.

Scriptlets ($ const x = ...;) → module-level work is static (or server/client); reactive inline logic is <const>/<let>.

<html-text> → plain ${...} in content (and remember: at the start of a top-level line, wrap text in an element).

<include-text> / <include-html> → ${value} and $!{value}. Template inclusion generally → custom tags, or a dynamic tag with an imported reference.

marko-tag.json attribute definitions ("attributes": { "label": "string", ... } with required/type validation) → a TypeScript Input interface, checked by mtc. Marko 6 builds ignore the old validation config entirely — the type is the attribute contract now (the tooling part covers this).

Class API TypeScript types (Marko.Component, Marko.Out, Marko.Emitter) → removed from Marko 6’s types; they remain available only through the marko@5 package when running both versions side by side.

Lifecycle methods (onCreate, onMount, …) → mostly unnecessary; <script> + $signal for effects, <lifecycle> for imperative objects.

The page on the right is a half-converted Marko 5 component — two spots still speak the old dialect, marked with comments:

1. The save button’s TODO describes this.emit("save") — implement it the 6 way: the page already receives an onSave function attribute; call input.onSave(title) in the click handler.
2. The bio TODO describes <include-html data.bioHtml> — render input.bioHtml with the unescaped interpolation (it’s authored markup, the legitimate case).

Welcome to 6 — smaller vocabulary, same reach.