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babel-plugin-transform-bigint
Advanced tools
babel-plugin-transform-bigint
*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 onl
babel-plugin-transform-bigint
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.
An example from https://github.com/GoogleChromeLabs/babel-plugin-transform-jsbi-to-bigint:
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 !
Usage:
- Create a file test.js:
// 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();
}
- Use babel:
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
- create a file
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>
- Open
test.htmlin a web browser.
Keywords
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 941 weekly downloads. As such, babel-plugin-transform-bigint popularity was classified as not 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.
Package last updated on 18 Mar 2019
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