js/template.js

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JavaScript
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function setup(root) {
root.parts = {}
root.querySelectorAll("[part-id]").forEach( element => {
root.parts[element.getAttribute("part-id")] = element
})
root.clone = function() { return setup(this.cloneNode(true)) }
return root
}
function template(strings, ...args) {
let buf = []
for (i=0;i<strings.length;i++) {
buf.push(strings[i], args[i])
}
let template = document.createElement("template")
template.innerHTML = buf.join("")
return setup(template.content)
}