babel-plugin-transform-bigint
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A plugin for babel to transform `x * y` into something like `JSBI.multiply(x, y)` to support bigints.
Update: Now it can convert a code using BigInt into a code using JSBI (https://github.com/GoogleChromeLabs/jsbi). It will try to detect when an operator is used for bigints, not numbers. This will not work in many cases, so please use JSBI directly only if you know, that the code works only with bigints.
Input using native BigInts:
const a = BigInt(Number.MAX_SAFE_INTEGER);
const b = 2n;
a + b;
a - b;
a * b;
a / b;
a % b;
a ** b;
a << b;
a >> b;
a & b;
a | b;
a ^ b;
-a;
~a;
a === b;
a < b;
a <= b;
a > b;
a >= b;
a.toString();
Number(a);
Compiled output using JSBI:
const a = JSBI.BigInt(Number.MAX_SAFE_INTEGER);
const b = JSBI.BigInt(2);
JSBI.add(a, b);
JSBI.subtract(a, b);
JSBI.multiply(a, b);
JSBI.divide(a, b);
JSBI.remainder(a, b);
JSBI.exponentiate(a, b);
JSBI.leftShift(a, b);
JSBI.signedRightShift(a, b);
JSBI.bitwiseAnd(a, b);
JSBI.bitwiseOr(a, b);
JSBI.bitwiseXor(a, b);
JSBI.unaryMinus(a);
JSBI.bitwiseNot(a);
JSBI.equal(a, b);
JSBI.lessThan(a, b);
JSBI.lessThanOrEqual(a, b);
JSBI.greaterThan(a, b);
JSBI.greaterThanOrEqual(a, b);
a.toString();
JSBI.toNumber(a);
¡ It is buggy !
// floor(log2(n)), n >= 1
function ilog2(n) {
let i = 0n;
while (n >= 2n**(2n**i)) {
i += 1n;
}
let e = 0n;
let t = 1n;
while (i >= 0n) {
let b = 2n**i;
if (n >= t * 2n**b) {
t *= 2n**b;
e += b;
}
i -= 1n;
}
return e;
}
// floor(sqrt(S)), S >= 0, https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
function sqrt(S) {
let e = ilog2(S);
if (e < 2n) {
return 1n;
}
let f = e / 4n + 1n;
let x = (sqrt(S / 2n**(f * 2n)) + 1n) * 2n**f;
let xprev = x + 1n;
while (xprev > x) {
xprev = x;
x = (x + S / x) / 2n;
}
return xprev;
}
function squareRoot(value, decimalDigits) {
return (sqrt(BigInt(value) * 10n**(BigInt(decimalDigits) * 2n + 2n)) + 5n).toString();
}
npm install --save https://github.com/Yaffle/babel-plugin-transform-bigint
npm install --save-dev @babel/core @babel/cli
npx babel --plugins=babel-plugin-transform-bigint test.js > test-transformed.js
test.html.<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="node_modules/big-integer/BigInteger.js"></script>
<script src="node_modules/babel-plugin-transform-bigint/runtime.js"></script>
<script src="test-transformed.js"></script>
<script>
document.addEventListener("DOMContentLoaded", function (event) {
const form = document.querySelector("form");
const update = function () {
const value = form.value.value;
const digits = Number(form.digits.value);
const s = squareRoot(value, digits);
form.output.value = '√' + value + ' ≈ ' + s.slice(0, 0 - digits - 1) + '.' + s.slice(0 - digits - 1, -1) + '…';
};
form.oninput = function () {
update();
};
update();
}, false);
</script>
<style>
output {
overflow-wrap: break-word;
}
</style>
</head>
<body>
<form>
<div>
<label for="value">Value:</label>
<input id="value" name="value" type="number" min="2" step="1" value="2" />
</div>
<div>
<label for="digits">Number of decimal digits:</label>
<input id="digits" name="digits" type="number" min="1" step="1" value="100" />
</div>
<div>
<output id="output" name="output" for="value digits" tabindex="0"></output>
</div>
</form>
</body>
</html>
test.html in a web browser.FAQs
A plugin for babel to transform `x * y` into something like `JSBI.multiply(x, y)` to support bigints.
The npm package babel-plugin-transform-bigint receives a total of 1,369 weekly downloads. As such, babel-plugin-transform-bigint popularity was classified as popular.
We found that babel-plugin-transform-bigint demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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