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ShanonJackson/Surrogates.tsx

Created May 9, 2020 05:26
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Surrogates.tsx
// https://dmitripavlutin.com/what-every-javascript-developer-should-know-about-unicode/#24-surrogate-pairs
const isSurrogate = (code) => 0xd800 <= code && code <= 0xdfff;
/* Modify our onKeyDown Backspace Handler slightly... */
if (e.keyCode === Keycodes.BACKSPACE) {
if (start === 0) return;
const charsToRemove = isSurrogate(value.charCodeAt(start - 1)) ? 2 : 1;
return insertString("", { start: start - charsToRemove, end: start });
}
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