@nodesecure/js-x-ray/dist/utils/isMinifiedCode.js

JavaScript AST XRay analysis

// CONSTANTS
const kCommentPattern = /\/\*[\s\S]*?\*\/\r?\n?|\/\/.{0,200}?(?:\r?\n|$)/g;
/**
 * This code has been imported from:
 * https://github.com/MartinKolarik/is-minified-code
 */
export function isMinifiedCode(code) {
    const cleaned = code.replace(kCommentPattern, "");
    const lines = [];
    let lineStart = 0;
    // Replicate /\r?\n$/ without a second regex pass + intermediate string
    let end = cleaned.length;
    if (end > 0 && cleaned[end - 1] === "\n") {
        end--;
        if (end > 0 && cleaned[end - 1] === "\r") {
            end--;
        }
    }
    // Replicate .split("\n").flatMap(...) without allocating a string[]
    for (let i = 0; i <= end; i++) {
        if (i === end || cleaned[i] === "\n") {
            const len = i - lineStart;
            if (len > 0) {
                lines.push(len);
            }
            lineStart = i + 1;
        }
    }
    return lines.length <= 1 || median(lines) > 200;
}
function median(values) {
    // Sort in-place: `values` is the local `lines` array, not used after this call
    values.sort((a, b) => a - b);
    const half = Math.floor(values.length / 2);
    return values.length % 2
        ? values[half]
        : (values[half - 1] + values[half]) / 2;
}
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