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lezer-based JavaScript grammar

There is a newer version: 1.4.21

# No semicolons

x
if (a) {
  var b = c
  d
} else
  e

==>

Script(
  ExpressionStatement(VariableName),
  IfStatement(if,ParenthesizedExpression(VariableName),Block(
     VariableDeclaration(var,VariableDefinition,Equals,VariableName),
     ExpressionStatement(VariableName)),
   else,ExpressionStatement(VariableName)))

# Continued expressions on new line

x
+ 2
foo
(bar)

==>

Script(
  ExpressionStatement(BinaryExpression(VariableName,ArithOp,Number)),
  ExpressionStatement(CallExpression(VariableName,ArgList(VariableName))))

# Doesn't parse postfix ops on a new line

x
++y

==>

Script(
  ExpressionStatement(VariableName),
  ExpressionStatement(UnaryExpression(ArithOp,VariableName)))

# Eagerly cut return/break/continue

return 2
return
2
continue foo
continue
foo
break bar
break
bar

==>

Script(
  ReturnStatement(return,Number),
  ReturnStatement(return),
  ExpressionStatement(Number),
  ContinueStatement(continue,Label),
  ContinueStatement(continue),
  ExpressionStatement(VariableName),
  BreakStatement(break,Label),
  BreakStatement(break),
  ExpressionStatement(VariableName))

# Cut return regardless of whitespace

{ return }

return // foo
;

==>

Script(Block(ReturnStatement(return)),ReturnStatement(return,LineComment))