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);

Playground:

Open https://babeljs.io/en/repl
Turn off all presets.
"Add plugin" @babel/babel-plugin-syntax-bigint
"Add plugin" babel-plugin-transform-bigint

¡ It is buggy !

Example:

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.html in a web browser.

Keywords

FAQs

What is babel-plugin-transform-bigint?

Is babel-plugin-transform-bigint popular?

Is babel-plugin-transform-bigint well maintained?

Last updated on 21 Jan 2021

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

babel-plugin-transform-bigint