EcmaVersion 7: Unary minus and exponentiation not working #462
Description
escodegen does not support the combination of unary minus and exponentiation:
➜ arith2js-parallel-computing-group-parallel git:(essay-2023-02-15-miercoles) ✗ node
Welcome to Node.js v18.8.0.
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> let espree = require('espree')
> let ast = espree.parse('(-2)**2') // gives an error since the default compiler is ecma 5
Uncaught [SyntaxError: Unexpected token *
> let ast3 = espree.parse('(-2)**2', { ecmaVersion: 7}) // no errors. Right AST
> let escodegen = require('escodegen')
> let gc = escodegen.generate(ast3) // escodegen does not support this feature. The code generated is wrong
> gc
'-2 ** 2;'
> eval(gc) // the evaluation of the code produces errors
Uncaught:
SyntaxError: Unary operator used immediately before exponentiation expression. Parenthesis must be used to disambiguate operator precedence
> -2 ** 2 # JS does not accept this expression
-2 ** 2
^^^^^
Uncaught:
SyntaxError: Unary operator used immediately before exponentiation expression. Parenthesis must be used to disambiguate operator precedence
> (-2) ** 2 # ... But this code works
4