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symbols.js
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symbols.js
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class Symbols {
_symbols = [
{
name: "window",
time: Date.now(),
selector: "window",
element: window,
}
]
_last = 0
get last() {
return this._symbols[this._last]
}
byname(name) {
for (var symbol of this._symbols) {
if (symbol.name === name) {
symbol.time = Date.now()
return symbol
}
}
throw new Error(`Cannot find symbol matching: '${name}'`)
}
exists(func) {
return this._symbols.some(func)
}
add(symbol) {
symbol.time = Date.now()
var len = this._symbols.length + 1
this._symbols.push(symbol)
this._last = len
}
waitfor(root, selector) {
return new Promise(resolve => {
if (root.querySelector(selector)) {
return resolve(root.querySelector(selector));
}
const observer = new MutationObserver(mutations => {
if (root.querySelector(selector)) {
resolve(root.querySelector(selector));
observer.disconnect();
}
});
observer.observe(document.body, {
childList: true,
subtree: true
});
});
}
}
export default Symbols