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codebase-memory-mcp/tools/tree-sitter-javascript/src/grammar.json
T
Martin Vogel 1b79558975 fix(grammar): accept a lone '&' in JSX strings and text (#1736) 
A plain '&' inside JSX -- a URL query in an attribute
(href="https://fonts.googleapis.com/css2?family=Inter&display=swap"),
or text such as <p>Tom & Jerry</p> -- produced a tree-sitter ERROR node
in .js, .jsx and .tsx files. The file was flagged parse_partial in the
coverage view, and the error recovery turned words from the URL
(create-next-app -> create/next/app) into identifiers that resolved to
unrelated symbols as false USAGE edges.

Root cause is upstream tree-sitter-javascript, which the tsx dialect
builds on: unescaped_{double,single}_jsx_string_fragment is
/([^"&]|&[^#A-Za-z])+/, so '&' is only accepted before a space/digit
or as a complete html_character_reference (&amp; / &#38;). jsx_text is
scanned by the external scanner, which stops at every '&', and nothing
in _jsx_child accepted a '&' that is not a reference. So '&' + letter in
a string, and any lone '&' in JSX text, had no valid token.

Fix: javascript and tsx become self-maintained forks of the pins we
already vendored (javascript @ 58404d8cf191; typescript tsx @
75b3874edb2d on its javascript base @ 3a837b6f3658), following the
arkts model. One patch (tools/tree-sitter-javascript/patches/
jsx-lone-ampersand.patch) is applied to both javascript bases:
- a one-character '&' token at lexical precedence -1, aliased to the
  existing string_fragment (in strings) and jsx_text (in text); the
  lower precedence keeps &amp; / &#38; lexing as html_character_reference
- the string-fragment regexes exclude a '&' directly before the closing
  quote, so "a&" no longer runs past the end of the string
Node types are unchanged (same type/named set). The external scanners
stay upstream bytes. Parsers regenerated with tree-sitter-cli 0.25.10
(ABI 15; tsx moves from ABI 14, and its tree_sitter/ headers now match
arkts). Without the patch both fork dirs regenerate upstream exactly.
The upstream corpus passes unchanged: javascript 116/116; tsx gives the
same results as unpatched upstream.

Proof on vercel/next.js examples/ (canary 725705bd, 1,722 js/jsx/tsx
files): parse_partial 92 -> 47 (tsx 33 -> 0, jsx 2 -> 0, js 12 -> 2; the
two left are Babel do-expressions and Flow types), no newly flagged
file, code-graph nodes 14,739 -> 14,739, edges 24,773 -> 24,657: the
115 USAGE edges removed were all false cross-example edges from URL
fragments, plus a 4 SIMILAR_TO / +3 SEMANTICALLY_RELATED reshuffle
from the corrected ASTs.

Registered like arkts: MANIFEST.md fork rows + notes (ABI tally
recounted), audit FORKS map, THIRD_PARTY.md, vendored checksums.
LICENSEs stay upstream's MIT byte-identical.

Tests: parse_coverage gains a .js/.jsx/.tsx matrix (double/single-quoted
attribute, '&' before the quote, '&' + letter/space/digit in text, plus
&amp;/&#38; controls) and a guard that broken JSX is still flagged.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>
2026-09-29 03:02:51 +02:00

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"type": "SYMBOL",
"name": "html_comment"
},
{
"type": "PATTERN",
"value": "[\\s\\p{Zs}\\uFEFF\\u2028\\u2029\\u2060\\u200B]"
}
],
"conflicts": [
[
"primary_expression",
"_property_name"
],
[
"primary_expression",
"await_expression"
],
[
"primary_expression",
"await_expression",
"_property_name"
],
[
"primary_expression",
"arrow_function"
],
[
"primary_expression",
"arrow_function",
"_property_name"
],
[
"primary_expression",
"method_definition"
],
[
"primary_expression",
"rest_pattern"
],
[
"primary_expression",
"pattern"
],
[
"primary_expression",
"_for_header"
],
[
"variable_declarator",
"_for_header"
],
[
"array",
"array_pattern"
],
[
"object",
"object_pattern"
],
[
"assignment_expression",
"pattern"
],
[
"assignment_expression",
"object_assignment_pattern"
],
[
"labeled_statement",
"_property_name"
],
[
"computed_property_name",
"array"
],
[
"binary_expression",
"_initializer"
],
[
"class_static_block",
"_property_name"
]
],
"precedences": [
[
{
"type": "STRING",
"value": "member"
},
{
"type": "STRING",
"value": "template_call"
},
{
"type": "STRING",
"value": "call"
},
{
"type": "SYMBOL",
"name": "update_expression"
},
{
"type": "STRING",
"value": "unary_void"
},
{
"type": "STRING",
"value": "binary_exp"
},
{
"type": "STRING",
"value": "binary_times"
},
{
"type": "STRING",
"value": "binary_plus"
},
{
"type": "STRING",
"value": "binary_shift"
},
{
"type": "STRING",
"value": "binary_compare"
},
{
"type": "STRING",
"value": "binary_relation"
},
{
"type": "STRING",
"value": "binary_equality"
},
{
"type": "STRING",
"value": "bitwise_and"
},
{
"type": "STRING",
"value": "bitwise_xor"
},
{
"type": "STRING",
"value": "bitwise_or"
},
{
"type": "STRING",
"value": "logical_and"
},
{
"type": "STRING",
"value": "logical_or"
},
{
"type": "STRING",
"value": "ternary"
},
{
"type": "SYMBOL",
"name": "sequence_expression"
},
{
"type": "SYMBOL",
"name": "arrow_function"
}
],
[
{
"type": "STRING",
"value": "assign"
},
{
"type": "SYMBOL",
"name": "primary_expression"
}
],
[
{
"type": "STRING",
"value": "member"
},
{
"type": "STRING",
"value": "template_call"
},
{
"type": "STRING",
"value": "new"
},
{
"type": "STRING",
"value": "call"
},
{
"type": "SYMBOL",
"name": "expression"
}
],
[
{
"type": "STRING",
"value": "declaration"
},
{
"type": "STRING",
"value": "literal"
}
],
[
{
"type": "SYMBOL",
"name": "primary_expression"
},
{
"type": "SYMBOL",
"name": "statement_block"
},
{
"type": "STRING",
"value": "object"
}
],
[
{
"type": "SYMBOL",
"name": "meta_property"
},
{
"type": "SYMBOL",
"name": "import"
}
],
[
{
"type": "SYMBOL",
"name": "import_statement"
},
{
"type": "SYMBOL",
"name": "import"
}
],
[
{
"type": "SYMBOL",
"name": "export_statement"
},
{
"type": "SYMBOL",
"name": "primary_expression"
}
],
[
{
"type": "SYMBOL",
"name": "lexical_declaration"
},
{
"type": "SYMBOL",
"name": "primary_expression"
}
]
],
"externals": [
{
"type": "SYMBOL",
"name": "_automatic_semicolon"
},
{
"type": "SYMBOL",
"name": "_template_chars"
},
{
"type": "SYMBOL",
"name": "_ternary_qmark"
},
{
"type": "SYMBOL",
"name": "html_comment"
},
{
"type": "STRING",
"value": "||"
},
{
"type": "SYMBOL",
"name": "escape_sequence"
},
{
"type": "SYMBOL",
"name": "regex_pattern"
},
{
"type": "SYMBOL",
"name": "jsx_text"
}
],
"inline": [
"_call_signature",
"_formal_parameter",
"_expressions",
"_semicolon",
"_identifier",
"_reserved_identifier",
"_jsx_attribute",
"_jsx_element_name",
"_jsx_child",
"_jsx_element",
"_jsx_attribute_name",
"_jsx_attribute_value",
"_jsx_identifier",
"_lhs_expression"
],
"supertypes": [
"statement",
"declaration",
"expression",
"primary_expression",
"pattern"
],
"reserved": {
"global": [
{
"type": "STRING",
"value": "break"
},
{
"type": "STRING",
"value": "case"
},
{
"type": "STRING",
"value": "catch"
},
{
"type": "STRING",
"value": "class"
},
{
"type": "STRING",
"value": "const"
},
{
"type": "STRING",
"value": "continue"
},
{
"type": "STRING",
"value": "debugger"
},
{
"type": "STRING",
"value": "default"
},
{
"type": "STRING",
"value": "delete"
},
{
"type": "STRING",
"value": "do"
},
{
"type": "STRING",
"value": "else"
},
{
"type": "STRING",
"value": "export"
},
{
"type": "STRING",
"value": "extends"
},
{
"type": "STRING",
"value": "false"
},
{
"type": "STRING",
"value": "finally"
},
{
"type": "STRING",
"value": "for"
},
{
"type": "STRING",
"value": "function"
},
{
"type": "STRING",
"value": "if"
},
{
"type": "STRING",
"value": "import"
},
{
"type": "STRING",
"value": "in"
},
{
"type": "STRING",
"value": "instanceof"
},
{
"type": "STRING",
"value": "new"
},
{
"type": "STRING",
"value": "null"
},
{
"type": "STRING",
"value": "return"
},
{
"type": "STRING",
"value": "super"
},
{
"type": "STRING",
"value": "switch"
},
{
"type": "STRING",
"value": "this"
},
{
"type": "STRING",
"value": "throw"
},
{
"type": "STRING",
"value": "true"
},
{
"type": "STRING",
"value": "try"
},
{
"type": "STRING",
"value": "typeof"
},
{
"type": "STRING",
"value": "var"
},
{
"type": "STRING",
"value": "void"
},
{
"type": "STRING",
"value": "while"
},
{
"type": "STRING",
"value": "with"
}
],
"properties": []
}
}
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