syntax error in d3 script

[ORESoftware]

I am getting this syntax error when I load the d3 lib

Uncaught SyntaxError: Invalid or unexpected token d3.js:1193

which is this line

var π = Math.PI, τ = 2 * π, halfπ = π / 2, ε = 1e-6, ε2 = ε * ε, d3_radians = π / 180, d3_degrees = 180 / π;

hmmm any idea? 🤔🤔

thx