luhn-generator
Version:
A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm
28 lines (23 loc) • 1.03 kB
JavaScript
;
module.exports = function () {
return {
name: "minify-numeric-literals",
visitor: {
NumericLiteral(path) {
if (!path.node.extra) return;
const normal = path.node.value.toString().replace(/^0\./, ".");
let exponential = path.node.value.toExponential().replace(/\+/g, "");
if (exponential.indexOf(".") >= 0 && exponential.indexOf("e") >= 0) {
const lastChar = exponential.substr(exponential.lastIndexOf("e") + 1);
const dotIndex = exponential.lastIndexOf(".") + 1;
const subLength = exponential.substr(dotIndex, exponential.lastIndexOf("e") - dotIndex).length;
exponential = (exponential.substr(0, exponential.lastIndexOf("e") + 1) + (lastChar - subLength)).replace(".", "").replace(/e0/, "");
}
const replacement = normal.length > exponential.length ? exponential : normal;
if (path.node.extra.raw.length > replacement.length) {
path.node.extra.raw = replacement;
}
}
}
};
};