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Maximum call stack size exceeded

See original GitHub issue

Please try the simple options below,

options: {
  identifierNamesGenerator: 'mangled-shuffled',
  reservedNames: ['.*'],
}

Obfuscator version used: 2.9.4

Stack trace

RangeError: Maximum call stack size exceeded
RangeError: Maximum call stack size exceeded
    at o.isValidIdentifierName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:87:5)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:126:19)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledShuffledIdentifierNamesGenerator.ts:46:22)
    at o.generateNewMangledName (G:\XXX\node_modules\javascript-obfuscator\dist\webpack:\javascript-obfuscator\src\generators\identifier-names-generators\MangledIdentifierNamesGenerator.ts:127:35)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! temten@0.1.0 build: `vue-cli-service build`
npm ERR! Exit status 1

In src/generators/identifier-names-generators/MangledIdentifierNamesGenerators.ts line 231, function isValidIdentifierName (which is in src/generators/identifier-names-generators/AbstractIdentifierNamesGenerators.ts) excludes new mangled names that are matched with reservedNames. I think that’s the problem.

// src/generators/identifier-names-generators/MangledIdentifierNamesGenerators.ts
protected generateNewMangledName (previousMangledName: string): string {
  ...
  if (!this.isValidIdentifierName(newMangledName)) {
    newMangledName = this.generateNewMangledName(newMangledName);
  }

  return newMangledName;
}

// src/generators/identifier-names-generators/AbstractIdentifierNamesGenerators.ts
public isValidIdentifierName (name: string): boolean {
  return this.notReservedName(name) && !this.preservedNamesSet.has(name);
}

private notReservedName (name: string): boolean {
  return this.options.reservedNames.length
    ? !this.options.reservedNames.some((reservedName: string) =>
      new RegExp(reservedName, 'g').exec(name) !== null
    )
    : true;
}

In the document, reservedNames means something should not be obfuscated, in my case, .* means everything, then when you generate mangled names, you use reservedNames again for excluding, every mangled name will be excluded, it causes the dead loop.