refactor(js-x-ray): remove is-minified-code from dependencies and re-implement it in utils (#415)

Author: fraxken

.changeset/two-points-share.md

@@ -0,0 +1,5 @@
+---
+"@nodesecure/js-x-ray": minor
+---
+
+Remove is-minified-code from dependencies and re-implement function in utils

workspaces/js-x-ray/package.json

@@ -50,7 +50,6 @@
     "@nodesecure/tracer": "^3.0.0",
     "digraph-js": "2.2.4",
     "frequency-set": "^2.1.0",
-    "is-minified-code": "^2.0.0",
     "meriyah": "^6.0.0",
     "safe-regex": "^2.1.1",
     "ts-pattern": "^5.0.6"

workspaces/js-x-ray/src/AstAnalyser.ts

@@ -5,7 +5,6 @@ import path from "node:path";
 
 // Import Third-party Dependencies
 import type { ESTree } from "meriyah";
-import isMinified from "is-minified-code";
 
 // Import Internal Dependencies
 import {
@@ -22,7 +21,8 @@ import { ProbeRunner, type Probe } from "./ProbeRunner.js";
 import { walkEnter } from "./walker/index.js";
 import * as trojan from "./obfuscators/trojan-source.js";
 import {
-  isOneLineExpressionExport
+  isOneLineExpressionExport,
+  isMinifiedCode
 } from "./utils/index.js";
 import {
   PipelineRunner,
@@ -221,7 +221,7 @@ export class AstAnalyser {
       const str = await fs.readFile(pathToFile, "utf-8");
       const filePathString = pathToFile instanceof URL ? pathToFile.href : pathToFile;
 
-      const isMin = filePathString.includes(".min") || isMinified(str);
+      const isMin = filePathString.includes(".min") || isMinifiedCode(str);
       const data = this.analyse(str, {
         isMinified: isMin,
         module: path.extname(filePathString) === ".mjs" ? true : module,
@@ -274,7 +274,7 @@ export class AstAnalyser {
       const str = fsSync.readFileSync(pathToFile, "utf-8");
       const filePathString = pathToFile instanceof URL ? pathToFile.href : pathToFile;
 
-      const isMin = filePathString.includes(".min") || isMinified(str);
+      const isMin = filePathString.includes(".min") || isMinifiedCode(str);
       const data = this.analyse(str, {
         isMinified: isMin,
         module: path.extname(filePathString) === ".mjs" ? true : module,

workspaces/js-x-ray/src/utils/index.ts

@@ -2,3 +2,4 @@ export * from "./extractNode.js";
 export * from "./isOneLineExpressionExport.js";
 export * from "./notNullOrUndefined.js";
 export * from "./toArrayLocation.js";
+export * from "./isMinifiedCode.js";

workspaces/js-x-ray/src/utils/isMinifiedCode.ts

@@ -0,0 +1,32 @@
+// CONSTANTS
+const kCommentPattern = /\/\*[\s\S]*?\*\/\r?\n?|\/\/.{0,200}?(?:\r?\n|$)/g;
+const kTrailingLfPattern = /\r?\n$/;
+
+/**
+ * This code has been imported from:
+ * https://github.com/MartinKolarik/is-minified-code
+ */
+export function isMinifiedCode(
+  code: string
+): boolean {
+  const lines = code
+    .replace(kCommentPattern, "")
+    .replace(kTrailingLfPattern, "")
+    .split("\n")
+    .flatMap((line) => (line.length > 0 ? [line.length] : []));
+
+  return lines.length <= 1 || median(lines) > 200;
+}
+
+function median(
+  values: number[]
+): number {
+  const toSorted = [...values].sort((a, b) => a - b);
+  const half = Math.floor(toSorted.length / 2);
+
+  if (toSorted.length % 2) {
+    return toSorted[half];
+  }
+
+  return (toSorted[half - 1] + toSorted[half]) / 2;
+}