Language: TypeScript
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
export function lassoPath(lasso) {
    return (lasso ?? []).reduce((svg, [x, y], i) => {
        return svg += i == 0
            ? `M ${x},${y} `
            : i === lasso.length - 1
                ? ' Z'
                : `L ${x},${y} `;
    }, '');
}