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const str = '\u0065\u0301'
console.log(str == '\u00e9') // => false
const normalized = str.normalize('NFC')
console.log(normalized == '\u00e9') // => true
console.log(normalized.length) // => 1

// In short, if you’re building a web application and you’re accepting input from users, you should always normalize it to a canonical form in Unicode.
With JavaScript, you can use the String.prototype.normalize() method, which is built-in since ES2015.