Support decimal values and arithmetic

TypeScript should support decimal values and arithmetic, similar to .NET's Decimal and/or Java's BigDecimal type. This would solve some serious problems when writing business applications in JavaScript.

For the following TS code:

var a = 0.1m; // notation is totally ad-hoc, just for the sake of the example code
var b = 0.2m;
var c = a + b;
if (c === 0.3m) {
    console.log("OK");
}

the JS output should be something like this:

    var a = new Decimal("0.1");
    var b = new Decimal("0.2");
    var c = Decimal.add(a, b);
    if (Decimal.compare(c, new Decimal("0.3") === 0) {
        console.log("OK");
    }

where Decimal is the class that implements the decimal arithmetic and conversions.
There are a number of JS decimal implementations to take inspiration from:
https://github.com/MikeMcl/decimal.js
https://github.com/MikeMcl/bignumber.js
https://www.npmjs.com/package/jsdecimal
https://github.com/iriscouch/bigdecimal.js

See TypeScript's non-goals:

Provide additional runtime functionality or libraries. Instead, use TypeScript to describe existing libraries.

As you've said:

There are a number of JS decimal implementations to take inspiration from:
https://github.com/MikeMcl/decimal.js
https://github.com/MikeMcl/bignumber.js
https://www.npmjs.com/package/jsdecimal
https://github.com/iriscouch/bigdecimal.js

As our non-goal suggests, those libraries should be sufficiently usable from TypeScript itself. DefinitelyTyped currently currently has typings for decimal.js

Does Typescript have like bool.parse(), decimal.parse(), etc.? Does Typescript have datatype conversion features? Just wondering cuz we don't want to have baggage issues we're struggling with, from adding too many 3rd party libraries.

TypeScript doesn't provide any built-in run-time libraries.

As our non-goal suggests, those libraries should be sufficiently usable from TypeScript itself. DefinitelyTyped currently currently has typings for decimal.js

Looks like it's significantly outdated. The link doens't even work anymore. Any alternative to this problem so far?

I found this typings

https://www.npmjs.com/package/@types/decimal.js

for this library:

https://www.npmjs.com/package/decimal.js

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Support decimal values and arithmetic #2872

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Support decimal values and arithmetic #2872

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DanielRosenwasser commented on Apr 22, 2015

fletchsod-developer commented on Apr 23, 2015

RyanCavanaugh commented on Apr 23, 2015

mcwienczek commented on Feb 20, 2017

karsunke commented on Mar 13, 2017

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