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metamask-extension/ui/app/helpers/utils/switch-direction.js

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/**
* Switch the CSS stylesheet used between 'rtl' and 'ltr'
* @param {('ltr' | 'rtl')} direction - Text direction, either left-to-right (ltr) or right-to-left (rtl)
*/
const switchDirection = async (direction) => {
if (direction === 'auto') {
direction = 'ltr'
}
let updatedLink
Array.from(document.getElementsByTagName('link'))
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.filter((link) => link.rel === 'stylesheet')
.forEach((link) => {
if (link.title === direction && link.disabled) {
link.disabled = false
updatedLink = link
} else if (link.title !== direction && !link.disabled) {
link.disabled = true
}
})
if (updatedLink) {
return new Promise((resolve, reject) => {
updatedLink.onload = () => {
resolve()
}
updatedLink.onerror = () => reject(new Error(`Failed to load '${direction}' stylesheet`))
})
}
}
export default switchDirection