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feat: optimize atob and btoa performance #1464

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feat: optimize atob and btoa performance #1464

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d61861c
feat: optimize atob and btoa performance
Chanran Sep 29, 2025
9be5d63
feat: pre-allocating array
Chanran Oct 11, 2025
e82471a
Revert "feat: pre-allocating array"
Chanran Oct 11, 2025
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6 changes: 3 additions & 3 deletions packages/core-js/modules/web.atob.js
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ $({ global: true, bind: true, enumerable: true, forced: FORCED }, {
// `webpack` dev server bug on IE global methods - use call(fn, global, ...)
if (BASIC && !NO_SPACES_IGNORE && !NO_ENCODING_CHECK) return call($atob, globalThis, data);
var string = replace(toString(data), whitespaces, '');
var output = '';
var output = [];
var position = 0;
var bc = 0;
var length, chr, bs;
Expand All @@ -61,7 +61,7 @@ $({ global: true, bind: true, enumerable: true, forced: FORCED }, {
while (position < length) {
chr = charAt(string, position++);
bs = bc % 4 ? bs * 64 + c2i[chr] : c2i[chr];
if (bc++ % 4) output += fromCharCode(255 & bs >> (-2 * bc & 6));
} return output;
if (bc++ % 4) output.push(fromCharCode(255 & bs >> (-2 * bc & 6)));
} return output.join('');
}
});
6 changes: 3 additions & 3 deletions packages/core-js/modules/web.btoa.js
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Expand Up @@ -35,7 +35,7 @@ $({ global: true, bind: true, enumerable: true, forced: !BASIC || NO_ARG_RECEIVI
// `webpack` dev server bug on IE global methods - use call(fn, global, ...)
if (BASIC) return call($btoa, globalThis, toString(data));
var string = toString(data);
var output = '';
var output = [];
var position = 0;
var map = i2c;
var block, charCode;
Expand All @@ -45,7 +45,7 @@ $({ global: true, bind: true, enumerable: true, forced: !BASIC || NO_ARG_RECEIVI
throw new (getBuiltIn('DOMException'))('The string contains characters outside of the Latin1 range', 'InvalidCharacterError');
}
block = block << 8 | charCode;
output += charAt(map, 63 & block >> 8 - position % 1 * 8);
} return output;
output.push(charAt(map, 63 & block >> 8 - position % 1 * 8));
} return output.join('');
}
});