Support class fields

[regseb]

deobfuscate() doesn't support Public class fields and Private elements.

Public class fields

class Foo {
    bar;
};

/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:275
    return new JsError(this.startIndex, this.startLine + 1, this.startIndex - this.startLineStart + 1, msg);
           ^

JsError: [2:8]: Only methods are allowed in classes
    at GenericParser.createError (/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:275:12)
    at GenericParser.parseClass (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:2467:20)
    at GenericParser.parseStatementListItem (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:525:21)
    at GenericParser.parseBody (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:270:59)
    at GenericParser.parseScript (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:232:43)
    at parse (/home/regseb/testcase/node_modules/shift-parser/src/index.js:115:43)
    at deobfuscate (/home/regseb/testcase/node_modules/js-deobfuscator/dist/index.js:47:109)
    at file:///home/regseb/testcase/index.js:3:13
    at ModuleJob.run (node:internal/modules/esm/module_job:345:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:665:26) {
  index: 19,
  line: 2,
  column: 8,
  parseErrorLine: 2,
  parseErrorColumn: 8,
  description: 'Only methods are allowed in classes'
}

Private elements

class Foo {
    #bar;
};

/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:275
    return new JsError(this.startIndex, this.startLine + 1, this.startIndex - this.startLineStart + 1, msg);
           ^

JsError: [2:5]: Unexpected "#"
    at GenericParser.createError (/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:275:12)
    at GenericParser.createILLEGAL (/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:239:14)
    at GenericParser.advance (/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:1485:18)
    at GenericParser.lex (/home/regseb/testcase/node_modules/shift-parser/src/tokenizer.js:1501:27)
    at GenericParser.expect (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:172:19)
    at GenericParser.parseClass (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:2451:10)
    at GenericParser.parseStatementListItem (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:525:21)
    at GenericParser.parseBody (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:270:59)
    at GenericParser.parseScript (/home/regseb/testcase/node_modules/shift-parser/src/parser.js:232:43)
    at parse (/home/regseb/testcase/node_modules/shift-parser/src/index.js:115:43) {
  index: 16,
  line: 2,
  column: 5,
  parseErrorLine: 2,
  parseErrorColumn: 5,
  description: 'Unexpected "#"'
}

[ben-sb]

Unfortunately the parser lib this repo depends on doesn't have support for these JS features. Handling them would require either adding support to the parser or migrating to a different parser (e.g. Babel) - I don't have the capacity to do either currently.