babel-plugin-transform-decimal v0.1.0

babel-plugin-transform-decimal

NOTICE: This will not work in many cases, so please use bignumber.js or decimal.js directly only if you know, that the code works only with BigDecimals. Since proposal decimal is still in stage-1, it might changed a lot and this transformer many take this breaking changes in the feature.

A plugin for babel to transform x * y into something like JSBD.multiply(x, y) to support decimals.

Example

Input using native BigDecimals:

const a = BigDecimal(0.1);
const b = 0.2m;

a + b;
a - b;
a * b;
a / b;
a % b;
a ** b;

a === b;
a < b;
a <= b;
a > b;
a >= b;

a.toString();

Compiled output using JSBD:

const a = JSBD.BigDecimal(0.1);
const b = JSBD.BigDecimal(0.2);
JSBD.add(a, b);
JSBD.subtract(a, b);
JSBD.multiply(a, b);
JSBD.divide(a, b);
JSBD.remainder(a, b);
JSBD.pow(a, b);
JSBD.equal(a, b);
JSBD.lessThan(a, b);
JSBD.lessThanOrEqual(a, b);
JSBD.greaterThan(a, b);
JSBD.greaterThanOrEqual(a, b);
a.toString();

Playground

1. Open https://babeljs.io/en/repl
2. Turn off all presets.
3. "Add plugin" @babel/babel-plugin-syntax-decimal
4. "Add plugin" babel-plugin-transform-decimal

¡ It is buggy !

TODO(s)

• support BigDecimal.round(1m);
• support Number(0.1m);
• support shift operators << and >>;
• support bitwise operators like & / | / ^;

License

Published under ISC License.