babel-plugin-operators-chaining

For transpiling chained arithmetic comparison operators to normal logical expressions (as in python).

Important: this is an experimental plugin for an enclosed project. Be aware that it modifies the semantics. See the example below.

Example

In

if(0<=a<5) {
  // something
}
console.log(2!=1===1==1<2);             // false
console.log(2 > 3 < 4 == 4);            // false
console.log(2 <= 4 === true);           // true

transpiles to

Out

if (0 <= a && a < 5) {
  // something
}
console.log(2 != 1 && 1 === 1 && 1 == 1 && 1 < 2); // prints true
console.log(2 > 3 && 3 < 4 && 4 == 4);             // prints false
console.log(2 <= 4 && 4 === true);                 // prints false

Installation

$ npm install babel-plugin-operators-chaining

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["operators-chaining"]
}

Via CLI

$ babel --plugins operators-chaining script.js

Via Node API

require("babel-core").transform("code", {
  plugins: ["operators-chaining"]
});