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grammar.js
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// Using the informal draft spec to support the newest features of dart
// https://spec.dart.dev/DartLangSpecDraft.pdf
const DIGITS = token(sep1(/[0-9]+/, /_+/))
const HEX_DIGITS = token(sep1(/[A-Fa-f0-9]+/, '_'))
//Everything above RelationalTypeCast was incremented from its original value
//This was to get type casting issues finally fixed.
const DART_PREC = {
IMPORT_EXPORT: 19,
TYPE_IDENTIFIER: 18, //was: 17
DOT_IDENTIFIER: 19, //was: 18
UNARY_POSTFIX: 17,
UNARY_PREFIX: 16,
Multiplicative: 15, // *, /, ˜/, % Left
Additive: 14, // +, - Left
Shift: 13, // <<, >>, >>> Left
TYPE_ARGUMENTS: 13,
Bitwise_AND: 12, // & Left
Bitwise_XOR: 11, // ˆ Left
Bitwise_Or: 10, // | Left
RelationalTypeCast: 9, // <, >, <=, >=, as, is, is! None 8
RelationalTypeTest: 9,
Relational: 8, // <, >, <=, >=, as, is, is! None 8
Equality: 7, // ==, != None 7
Logical_AND: 6, // AND && Left
Logical_OR: 5, // Or || Left
If: 4, //-null ?? Left
Conditional: 3, // e1?e2:e3 Right 3
Cascade: 2, // .. Left
Assignment: 1, // =, *=, /=, +=, -=, &=, ˆ=, etc. Right
BUILTIN: 0,
TRY: 0,
// Added by Ben for experimentation.
SELECTOR_IN_PRIMARY: 1,
SELECTOR_IN_ASSIGNMENT: 0,
TYPE_ARGS: 1
};
// TODO: general things to add
// both string types
//get protocols in classes?
// todo: type test operators: as, is, and is!
//todo: assignment operators: ??=, and ~/=
//todo: ?? operator
// todo: cascade notation: dot dot accesses each object
//todo: conditional member access: blah?.foo
//todo: rethrow keyword
//todo: override operator notations
//todo: correct import statements to be strings
//todo: sync* and async* functions, plus yields
//DONE: override shorter constructor notations?
module.exports = grammar({
name: 'dart',
externals: $ => [
$._template_chars_double,
$._template_chars_single,
$._template_chars_double_single,
$._template_chars_single_single,
$._template_chars_raw_slash,
$._block_comment,
$._documentation_block_comment,
],
extras: $ => [
$.comment,
$.documentation_comment,
/\s/
],
supertypes: $ => [
// $._expression,
$._declaration,
$._statement,
$._literal,
// $._primary,
// $._type,
// $._simple_type,
// $._type,
],
inline: $ => [
$._ambiguous_name,
$._if_null_expression,
],
conflicts: $ => [
[$.block, $.set_or_map_literal],
[$._primary, $.function_signature],
[$._type_name, $._primary, $.function_signature],
[$._primary, $._type_name],
[$.variable_declaration, $.initialized_variable_definition, ],
[$._final_const_var_or_type, $.function_signature, ],
[$._primary, $._function_formal_parameter],
[$._primary, $._simple_formal_parameter],
[$._primary, $.labeled_statement],
[$._primary, $._type_name, $._function_formal_parameter],
[$._final_const_var_or_type, $._function_formal_parameter],
[$._primary, $.constructor_param],
[$._normal_formal_parameters],
[$.postfix_expression],
[$._declared_identifier],
[$.equality_expression],
[$._argument_list],
[$.variable_declaration, $.initialized_identifier, ],
[$.declaration, $._external_and_static],
[$.method_signature, $._static_or_covariant],
[$.constructor_signature, $._formal_parameter_part],
// [$._type_not_function, $._type_not_void],
[$._cascade_subsection],
[$._expression],
// [$._real_expression, $._below_relational_expression],
[$._postfix_expression],
// [$._top_level_definition, $.lambda_expression],
[$._top_level_definition, $._var_or_type, $.function_signature],
[$._var_or_type, $.function_signature],
[$._var_or_type, $._function_formal_parameter],
[$._var_or_type],
[$._top_level_definition, $._var_or_type],
[$._top_level_definition, $._final_const_var_or_type],
[$._top_level_definition, $.const_object_expression, $._final_const_var_or_type],
[$._final_const_var_or_type, $.const_object_expression],
[$._final_const_var_or_type],
[$.type_parameter, $._type_name],
[$.class_definition],
[$._normal_formal_parameter],
[$.library_name, $.dotted_identifier_list],
[$._top_level_definition, $.inferred_type],
[$._final_const_var_or_type, $._top_level_definition, $.function_signature],
[$._assignable_selector_part, $.selector],
[$._assignable_selector_part, $._postfix_expression],
[$._assignable_selector_part, $.postfix_expression],
[$._primary, $.assignable_expression],
[$._simple_formal_parameter, $.assignable_expression],
// [$._type_name, $._primary, $.assignable_expression],
[$.assignable_expression, $.postfix_expression],
[$.assignable_expression, $._postfix_expression],
// [$._type_name, $.assignable_expression],
// [$._type_name, $.function_signature],
[$._type_name, $._function_formal_parameter],
[$._type_name],
// [$.assignment_expression, $._expression],
[$.assignable_expression],
[$.method_signature, $.declaration, $._static_or_covariant],
[$.type_arguments],
[$._primary, $._type_name, $.assignable_expression],
[$._primary, $._type_name, $.assignable_expression, $.function_signature],
[$._primary, $._type_name, $.assignable_expression, $._function_formal_parameter],
[$._type_name, $.function_signature],
// [$.relational_operator, $._shift_operator],
[$.declaration, $._external],
[$.relational_expression],
[$.factory_constructor_signature, $.redirecting_factory_constructor_signature],
[$._function_type_tail],
[$._type_not_void_not_function, $._function_type_tail],
[$._type_not_void],
[$._type_not_void_not_function],
[$.super_formal_parameter, $.unconditional_assignable_selector],
[$.function_signature],
[$.assignable_expression, $.member_access, $._postfix_expression],
[$._assignable_selector_part, $.member_access],
[$.member_access],
],
word: $ => $.identifier,
rules: {
// Page 188 libraryDeclaration
program: $ => seq(
optional($.script_tag),
optional($.library_name),
repeat($.import_or_export),
repeat($.part_directive),
repeat($.part_of_directive),
// The precedence here is to make sure that this rule is matched before any of the _statement rules are matched for testing.
repeat(prec.dynamic(22, choice(
seq(optional($._metadata), $._top_level_definition),
//for testing:
$._statement,
))),
optional($._expression),
),
external_declaration: $ => seq(
$._external_builtin,
field('signature', choice(
$.function_signature,
$.getter_signature,
$.setter_signature,
)),
$._semicolon,
),
// Page 187 topLevelDefinition
_top_level_definition: $ => choice(
$.class_definition,
$.enum_declaration,
$.extension_declaration,
$.mixin_declaration,
$.type_alias,
$.external_declaration,
// seq(
// $.function_signature,
// $.function_body
// ),
seq(
$.getter_signature,
// optional($._type),
// $._get,
// $.identifier,
$.function_body
),
seq(
$.setter_signature,
// optional($._type),
// $._set,
// $.identifier,
// $.formal_parameter_list,
$.function_body
),
// final or const static final declaration list
seq(
choice(
$.final_builtin,
$.const_builtin
),
optional($._type),
$.static_final_declaration_list,
$._semicolon
),
seq(
$._late_builtin,
$.final_builtin,
optional($._type),
$.initialized_identifier_list,
$._semicolon
),
seq(
optional($._late_builtin),
choice($._type, seq($.inferred_type, optional($._type))),
$.initialized_identifier_list,
$._semicolon
)
),
/**************************************************************************************************
*********************************Literals**********************************************************
***************************************************************************************************
****These are the Literals from section 16.4-9 (Page 84-110) of the dart specification*************
***************************************************************************************************
***************************************************************************************************/
_literal: $ => choice(
$.decimal_integer_literal,
$.hex_integer_literal,
$.decimal_floating_point_literal,
$.true,
$.false,
$.string_literal,
$.null_literal,
$.symbol_literal,
$.list_literal,
$.set_or_map_literal
),
/****This is the symbol literals from section 16.8 (Page 99) of the dart specification****************/
symbol_literal: $ => seq('#', $.identifier),
//symbol literal can also be an operator?
/**************************************************************************************************
*********************************Numeric Literals**************************************************
***************************************************************************************************
****These are the Numeric Literals from section 16.5 (Page 84-85) of the dart specification********
***************************************************************************************************
***************************************************************************************************/
decimal_integer_literal: $ => token(DIGITS),
hex_integer_literal: $ => token(seq(
choice('0x', '0X'),
HEX_DIGITS
)),
decimal_floating_point_literal: $ => token(choice(
seq(DIGITS, '.', DIGITS, optional(seq((/[eE]/), optional(choice('-', '+')), DIGITS))),
seq('.', DIGITS, optional(seq((/[eE]/), optional(choice('-', '+')), DIGITS))),
seq(DIGITS, /[eE]/, optional(choice('-', '+')), DIGITS),
seq(DIGITS, optional(seq((/[eE]/), optional(choice('-', '+')), DIGITS)))
)),
/**************************************************************************************************
*********************************Boolean Literals**************************************************
***************************************************************************************************
****These are the boolean from section 16.6 (Page 86) of the dart specification********************
***************************************************************************************************
***************************************************************************************************/
true: $ => prec(
DART_PREC.BUILTIN,
'true',
),
false: $ => prec(
DART_PREC.BUILTIN,
'false',
),
/**************************************************************************************************
*********************************String Parts******************************************************
***************************************************************************************************
****These are the parts of String from section 16.7 (Page 86-92) of the dart specification*********
***************************************************************************************************
***************************************************************************************************/
string_literal: $ => repeat1(
choice(
$._string_literal_double_quotes,
$._string_literal_single_quotes,
$._string_literal_double_quotes_multiple,
$._string_literal_single_quotes_multiple,
//raw, separate later
$._raw_string_literal_double_quotes,
$._raw_string_literal_single_quotes,
$._raw_string_literal_double_quotes_multiple,
$._raw_string_literal_single_quotes_multiple,
),
),
_string_literal_double_quotes: $ => seq(
'"',
repeat(
choice(
$._template_chars_double_single,
'\'',
$.escape_sequence,
$._sub_string_test,
$.template_substitution
)
),
'"'
),
_string_literal_single_quotes: $ => seq(
'\'',
repeat(choice(
$._template_chars_single_single,
'"',
$.escape_sequence,
$._sub_string_test,
$.template_substitution
)),
'\''
),
_string_literal_double_quotes_multiple: $ => prec.left(
seq(
'"""',
repeat(choice(
$._template_chars_double,
'\'',
'\"',
$.escape_sequence,
$._sub_string_test,
$.template_substitution
)),
'"""'
),
),
_string_literal_single_quotes_multiple: $ => prec.left(
seq(
'\'\'\'',
repeat(choice(
$._template_chars_single,
'"',
'\'',
$.escape_sequence,
$._sub_string_test,
$.template_substitution
)),
'\'\'\''
),
),
_raw_string_literal_double_quotes: $ => seq(
'r"',
repeat(choice(
$._template_chars_double_single,
// /[^\n"]*/,
'\'',
$._template_chars_raw_slash,
// '\\',
$._unused_escape_sequence,
$._sub_string_test,
'$'
)),
'"'
),
_raw_string_literal_single_quotes: $ => seq(
'r\'',
repeat(choice(
$._template_chars_single_single,
// /[^\n']/,
'"',
$._template_chars_raw_slash,
// '\\',
$._unused_escape_sequence,
$._sub_string_test,
'$'
)),
'\''
),
_raw_string_literal_double_quotes_multiple: $ => prec.left(
seq(
'r"""',
// $._triple_double_quote_end,
repeat(choice(
$._template_chars_double,
'\'',
// '\\',
$._template_chars_raw_slash,
'"',
$._unused_escape_sequence,
$._sub_string_test,
'$'
)),
'"""'
// $._triple_double_quote_end
),
),
_raw_string_literal_single_quotes_multiple: $ => prec.left(
seq(
'r\'\'\'',
// $._triple_quote_end,
repeat(choice(
$._template_chars_single,
'"',
'\'',
// '\\',
$._template_chars_raw_slash,
$._unused_escape_sequence,
$._sub_string_test,
'$'
)),
'\'\'\''
// $._triple_quote_end
),
),
_triple_quote_end: $ => token('\'\'\''),
_triple_double_quote_end: $ => token('"""'),
template_substitution: $ => seq(
'$',
choice(
seq('{',
$._expression,
'}'),
$.identifier_dollar_escaped
)
),
_sub_string_test: $ => seq('$', /[^a-zA-Z_{]/),
_string_interp: $ => /\$((\w+)|\{([^{}]+)\})/, // represents $word or ${word} for now
_unused_escape_sequence: $ => token.immediate(seq(
'\\',
choice(
/[^xu0-7]/,
/[0-7]{1,3}/,
/x[0-9a-fA-F]{2}/,
/u[0-9a-fA-F]{4}/,
/u{[0-9a-fA-F]+}/
)
)),
escape_sequence: $ => $._unused_escape_sequence,
/**************************************************************************************************
*********************************Collection Literals***********************************************
***************************************************************************************************
****These are the collection literals from section 16.9 (Page 92-108) of the dart specification****
***************************************************************************************************
***************************************************************************************************/
list_literal: $ => seq(
optional($.const_builtin), optional($.type_arguments), '[',
commaSepTrailingComma($._element),
']'
),
set_or_map_literal: $ => seq(
optional($.const_builtin), optional($.type_arguments), '{',
commaSepTrailingComma(
$._element
),
'}'
),
pair: $ => seq(
field('key', $._expression),
':',
field('value', $._expression)
),
// pair_or_element: $ => seq(
// field('key', $._expression),
// optional(
// seq(
// ':',
// field('value', $._expression)
// )
// )
// ),
_element: $ => choice(
$._expression,
$.pair,
$.spread_element,
$.if_element,
$.for_element
),
/****This is the null literal from section 16.4 (Page 84) of the dart specification****/
null_literal: $ => prec(
DART_PREC.BUILTIN,
'null',
),
/**************************************************************************************************
*********************************Expressions*******************************************************
***************************************************************************************************
****These are the expressions from section 16.9 (Page 110-166) of the dart specification***********
***************************************************************************************************
***************************************************************************************************/
_expression: $ => choice(
$.assignment_expression,
$.throw_expression,
seq(
$._real_expression,
repeat($.cascade_section)
)
),
_expression_without_cascade: $ => choice(
$.assignment_expression_without_cascade,
$._real_expression,
$.throw_expression_without_cascade
),
_real_expression: $ => choice(
$.conditional_expression,
$.logical_or_expression,
$.if_null_expression,
$.additive_expression,
$.multiplicative_expression,
$.relational_expression,
$.equality_expression,
$.logical_and_expression,
$.bitwise_and_expression,
$.bitwise_or_expression,
$.bitwise_xor_expression,
$.shift_expression,
$.type_cast_expression,
$.type_test_expression,
$._unary_expression
),
// _below_relational_expression: $ => choice(
// // UNARY_POSTFIX: 16,
// // UNARY_PREFIX: 15,
// // Multiplicative: 14, // *, /, ˜/, % Left
// // Additive: 13, // +, - Left
// // Shift: 12, // <<, >>, >>> Left
// // Bitwise_AND: 11, // & Left
// // Bitwise_XOR: 10, // ˆ Left
// // Bitwise_Or: 9 , // | Left
// // $.type_cast_expression,
// $._unary_expression,
// $.multiplicative_expression,
// $.additive_expression,
// $.shift_expression,
// $.bitwise_and_expression,
// $.bitwise_or_expression,
// $.bitwise_xor_expression,
//
// ),
//
// _below_relational_type_cast_expression: $ => prec(
// DART_PREC.RelationalTypeCast,
// choice(
// // UNARY_POSTFIX: 16,
// // UNARY_PREFIX: 15,
// // Multiplicative: 14, // *, /, ˜/, % Left
// // Additive: 13, // +, - Left
// // Shift: 12, // <<, >>, >>> Left
// // Bitwise_AND: 11, // & Left
// // Bitwise_XOR: 10, // ˆ Left
// // Bitwise_Or: 9 , // | Left
// $._unary_expression,
// $.multiplicative_expression,
// $.additive_expression,
// $.shift_expression,
// $.bitwise_and_expression,
// $.bitwise_or_expression,
// $.bitwise_xor_expression,
//
// )
// ),
throw_expression: $ => seq(
'throw',
$._expression
),
throw_expression_without_cascade: $ => seq(
'throw',
$._expression_without_cascade
),
// cast_expression: $ => prec(PREC.CAST, seq(
// '(',
// sep1(field('type', $._type), '&'),
// ')',
// field('value', $._expression)
// )),
/**************************************************************************************************
***********************Assignment Expressions*****************************************************
***************************************************************************************************
****These are the assignment expressions from section 16.34 (Page 159) of the dart DRAFT**********
* specification. (Very different from the formal spec in this instance)****************************
***************************************************************************************************
***************************************************************************************************/
assignment_expression: $ => prec.right(DART_PREC.Assignment, seq( //right
field('left', $.assignable_expression),
field('operator', $._assignment_operator),
field('right', $._expression)
)),
assignment_expression_without_cascade: $ => prec.right(DART_PREC.Assignment, seq( //right
field('left', $.assignable_expression),
field('operator', $._assignment_operator),
field('right', $._expression_without_cascade)
)),
assignable_expression: $ => choice(
seq($._primary, $._assignable_selector_part), // dart issue?
seq($.super, $.unconditional_assignable_selector),
seq($.constructor_invocation, $._assignable_selector_part),
$.identifier
),
_assignable_selector_part: $ => seq(
repeat($.selector),
$._assignable_selector
),
//'+=', '-=', '*=', '/=', '&=', '|=', '^=', '%=', '<<=', '>>=', '>>>=', '??='
//todo: use the op names in place of these.
_assignment_operator: $ => choice(
'=',
// additive operator
'+=',
'-=',
// multiplicative operator
'*=',
'/=',
'%=',
'~/=',
// shift operator
'<<=',
'>>=',
'>>>=',
'&=',
'^=',
'|=',
'??=',
),
// binary_expression: $ => choice(
// ...[
// ['>', PREC.REL],
// ['<', PREC.REL],
// ['==', PREC.REL],
// ['>=', PREC.REL],
// ['<=', PREC.REL],
// ['!=', PREC.REL],
// ['&&', PREC.AND],
// ['||', PREC.OR],
// ['+', PREC.PLUS],
// ['-', PREC.PLUS],
// ['*', PREC.TIMES],
// ['/', PREC.TIMES],
// ['&', PREC.AND],
// ['|', PREC.OR],
// ['^', PREC.OR],
// ['%', PREC.TIMES],
// ['<<', PREC.TIMES],
// ['>>', PREC.TIMES],
// ['>>>', PREC.TIMES],
// ].map(([operator, precedence]) =>
// prec.left(precedence, seq(
// field('left', $._expression),
// field('operator', operator),
// field('right', $._expression)
// ))
// )),
// instanceof_expression: $ => prec(PREC.REL, seq(
// field('left', $._expression),
// 'instanceof',
// field('right', $._type)
// )),
lambda_expression: $ => seq(
field('metadata', optional($._metadata)),
field('parameters', $.function_signature),
field(
'body',
$.function_body
)
),
function_expression: $ => seq(
field('parameters', $._formal_parameter_part),
field(
'body',
$.function_expression_body
)
),
inferred_parameters: $ => seq(
'(',
commaSep1($.identifier),
')'
),
if_null_expression: $ => prec.left( //left
DART_PREC.If,
seq(
field('first',
$._real_expression // logical_or_expression
),
$._if_null_expression
// optional(
// $._if_null_expression
// )
)
),
_if_null_expression: $ => repeat1(
seq(
'??',
field('second', $._real_expression)
)
),
conditional_expression: $ => prec.left( //left
DART_PREC.Conditional,
seq(
// $.if_null_expression,
$._real_expression,
seq(
'?',
field('consequence', $._expression_without_cascade),
':',
field('alternative', $._expression_without_cascade)
)
)
),
logical_or_expression: $ => prec.left( //left
DART_PREC.Logical_OR,
sep2($._real_expression, '||')
),
logical_and_expression: $ => prec.left( //left
DART_PREC.Logical_AND,
sep2($._real_expression, '&&')
),
equality_expression: $ => prec( //neither
DART_PREC.Equality,
choice(
seq(
// $.relational_expression,
$._real_expression,
// optional(
//
// )
$.equality_operator,
$._real_expression
// $.relational_expression
),
seq(
$.super,
$.equality_operator,
// $.relational_expression
$._real_expression
)
)
),
equality_operator: $ => token(
choice(
'==',
'!='
)
),
type_cast_expression: $ => prec.left(
DART_PREC.RelationalTypeCast,
seq(
// $._below_relational_type_cast_expression,
$._real_expression,
$.type_cast,
)
),
type_test_expression: $ => prec(
DART_PREC.RelationalTypeTest,
seq(
// $._below_relational_type_cast_expression,
$._real_expression,
$.type_test,
)
),
// _raw_type_cast: $ => prec.right(
// seq(
// $._below_relational_type_cast_expression,
// $.type_cast,
// )
// ),
relational_expression: $ => prec( // neither
DART_PREC.Relational,
choice(
// $._raw_type_cast,
seq(
// $.bitwise_or_expression,
// $._below_relational_type_cast_expression,
// TODO: The spec says optional but it breaks tests, and I'm not sure in a good way.
// Modified to account for type casts being compared relationally!
// I am not certain this is what designers intended. (see other comments on github)
// optional(
$._real_expression,
$.relational_operator,
$._real_expression
// choice(
// $.type_test,
// $.type_cast,
// seq(
// $.relational_operator,
// $._real_expression
// )
// )
// ),
),
// seq(
// // $.bitwise_or_expression,
// choice(
// $._raw_type_cast,
// $._below_relational_type_cast_expression
// ),
// $.relational_operator,
// choice(
// $._raw_type_cast,
// $._below_relational_type_cast_expression
// )
// ),
seq(
$.super,
$.relational_operator,
$._real_expression
),
)
),
relational_operator: $ => choice(
'<',
'>',
'<=',
'>='
),
//BITWISE EXPRESSIONS
bitwise_or_expression: $ => binaryRunLeft($._real_expression, '|', $.super, DART_PREC.Bitwise_Or),
bitwise_xor_expression: $ => binaryRunLeft($._real_expression, '^', $.super, DART_PREC.Bitwise_XOR),
bitwise_and_expression: $ => binaryRunLeft($._real_expression, '&', $.super, DART_PREC.Bitwise_AND),
shift_expression: $ => binaryRunLeft($._real_expression, $.shift_operator, $.super, DART_PREC.Shift),
additive_expression: $ => binaryRunLeft($._real_expression, $.additive_operator, $.super, DART_PREC.Additive),
multiplicative_expression: $ => binaryRunLeft($._unary_expression, $.multiplicative_operator, $.super, DART_PREC.Multiplicative),
bitwise_operator: $ => $._bitwise_operator,
_bitwise_operator: $ => choice(
'&',
'^',
'|'
),
shift_operator: $ => $._shift_operator,
_shift_operator: $ => choice(
'<<',
'>>',
'>>>'
),
additive_operator: $ => $._additive_operator,
_additive_operator: $ => token(
choice(
'+',
'-'
)
),
multiplicative_operator: $ => $._multiplicative_operator,
_multiplicative_operator: $ => choice(
'*',
'/',
'%',
'~/'
),
_unary_expression: $ => prec(
DART_PREC.UNARY_PREFIX,
choice(
$._postfix_expression,
$.unary_expression,
)
),
unary_expression: $ => prec( //neither
DART_PREC.UNARY_PREFIX,
choice(
seq($.prefix_operator, $._unary_expression),
$.await_expression,
// prec(DART_PREC.UNARY_POSTFIX, $._postfix_expression),
seq(
choice(
$.minus_operator,
$.tilde_operator
),
$.super
),
seq(
$.increment_operator,
$.assignable_expression
)
)
),
member_access: $ => seq(
$._primary,
repeat1($.selector),
) ,
_postfix_expression: $ => choice(
$._primary,
$.member_access,
$.postfix_expression
),
postfix_expression: $ => choice(
seq(
$.assignable_expression,
$.postfix_operator
),
seq(
$.constructor_invocation,
repeat(
$.selector
)
)
),
postfix_operator: $ => $.increment_operator,
increment_operator: $ => token(choice(
'++',
'--'
)),
spread_element: $ => seq(
'...',
optional('?'),
$._expression
),
selector: $ => choice(
// '!',
$._exclamation_operator,
$._assignable_selector,
$.argument_part
),
prefix_operator: $ => choice(
$.minus_operator,
$.negation_operator,
$.tilde_operator
),
minus_operator: $ => '-',
negation_operator: $ => $._exclamation_operator,
_exclamation_operator: $ => '!',
tilde_operator: $ => '~',
await_expression: $ => seq(
'await',
$._unary_expression
),
type_test: $ => seq(
$.is_operator,
$._type_not_void
),