graphql-helix
Version:
A highly evolved GraphQL HTTP Server 🧬
20 lines (19 loc) • 656 B
JavaScript
// returns the byte length of an utf8 string
// Taken from https://stackoverflow.com/questions/55426646/why-use-a-complex-function-to-caculate-the-length-of-the-string-instead-of-strin
export function calculateByteLength(str) {
let byteLength = str.length;
for (let i = str.length - 1; i >= 0; i--) {
const code = str.charCodeAt(i);
if (code > 0x7f && code <= 0x7ff) {
byteLength++;
}
else if (code > 0x7ff && code <= 0xffff) {
byteLength += 2;
}
if (code >= 0xdc00 && code <= 0xdfff) {
// trail surrogate
i--;
}
}
return byteLength;
}