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Showing content from https://www.npmjs.com/package/babel-plugin-transform-numeric-separator below:

babel-plugin-transform-numeric-separator - npm

This plugin allows Babel to transform Decimal, Binary, Hex and Octal literals containing Numeric Literal Separator to their non-separated form.

let budget = 1_000_000_000_000;
 
console.log(budget === 10 ** 12); 

let nibbles = 0b1010_0001_1000_0101;
 
console.log(!!(nibbles & (1 << 7))); 

let message = 0xA0_B0_C0;
 
let a = (message >> 16) & 0xFF; 
console.log(a.toString(16), a); 
 
let b = (message >> 8) & 0xFF;
console.log(b.toString(16), b); 
 
let c = message & 0xFF;
console.log(c.toString(16), b); 

hand wave emoji

Octals are great for permissions, but also look better when represented in 0o0000 form. No real benefit with separators here.

npm install --save-dev babel-plugin-transform-numeric-separator

.babelrc

{
  "plugins": ["transform-numeric-separator"]
}

babel --plugins transform-numeric-separator script.js

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

If you need to further compile ES2015 Decimal, Binary, Hex and Octal number representations to their pre-ES2015 numeric literal form, add the "transform-es2015-literals" plugin:

transform-es2015-literals is already included in babel-preset-env and babel-preset-es2015.

.babelrc

{
  "presets": ["env"],
  "plugins": ["transform-numeric-separator"]
}
{
  "plugins": ["transform-numeric-separator", "transform-es2015-literals"]
}

• Proposal: Numeric Separators

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