Parsing error with unary and exponentiation operator #1981
Description
Esprima does not seem to correctly parse the following code.
Steps to reproduce
require('esprima').parse('(+2)**4');Actual output
/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:1995
throw this.unexpectedTokenError(token, message);
^
Error: Line 1: Unexpected token **
at ErrorHandler.constructError (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:5012:22)
at ErrorHandler.createError (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:5028:27)
at Parser.unexpectedTokenError (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:1985:39)
at Parser.throwUnexpectedToken (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:1995:21)
at Parser.consumeSemicolon (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:2297:23)
at Parser.parseExpressionStatement (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:3649:15)
at Parser.parseStatement (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:4112:39)
at Parser.parseStatementListItem (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:3393:31)
at Parser.parseScript (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:4723:29)
at Object.parse (/Volumes/User/.npm-packages/lib/node_modules/esprima/dist/esprima.js:122:61) {
index: 4,
lineNumber: 1,
description: 'Unexpected token **'
}
The error does not occur for 2**(+4), so it appears to be specific to the base.
The error does not occur for (1+2)**4, so it appears to be specific to the unary operator.
The same error does occur for the following similar expressions: (-2)**4, (~~2)**4
Relevant references
Unary operator: 12.5.6.1
Exponentiation operator: 12.6.4