Module state 

Parser - Cache-optimized parser using NodeArena

This parser uses the Node architecture (16 bytes per node vs 208 bytes) for 13x better cache locality. It produces the same AST semantically but stored in a more efficient format.

Architecture

• Uses NodeArena instead of NodeArena
• Each node is 16 bytes (vs 208 bytes for fat Node enum)
• Node data is stored in separate typed pools
• 4 nodes fit per 64-byte cache line (vs 0.31 for fat nodes)

Structs

IncrementalParseResult

ParseDiagnostic

A parse-time diagnostic (error or warning).

ParserState

This parser produces the same AST semantically as ParserState, but uses the cache-optimized NodeArena for storage.

Constants

CONTEXT_FLAG_AMBIENT

Context flag: inside an ambient context (declare namespace/module)

CONTEXT_FLAG_ARROW_PARAMETERS

Context flag: parsing arrow function parameters.

CONTEXT_FLAG_ASYNC

Context flag: inside an async function/method/arrow

CONTEXT_FLAG_CLASS_MEMBER_NAME

Context flag: parsing a class member name.

CONTEXT_FLAG_CONSTRUCTOR_PARAMETERS

Context flag: parsing parameters of a class constructor.

CONTEXT_FLAG_DISALLOW_CONDITIONAL_TYPES

Context flag: disallow conditional types (used inside infer T extends X constraint parsing). When set, T extends U ? X : Y is not parsed as a conditional type.

CONTEXT_FLAG_DISALLOW_IN

Context flag: disallow ‘in’ as a binary operator (for for-statement initializers)

CONTEXT_FLAG_GENERATOR

Context flag: inside a generator function/method

CONTEXT_FLAG_IN_BLOCK

Context flag: inside a block statement (function body, bare block, if/while/for body). When set, modifiers like export and declare are not allowed and emit TS1184.

CONTEXT_FLAG_IN_CLASS

Context flag: parsing a class body

CONTEXT_FLAG_IN_CONDITIONAL_TRUE

Context flag: parsing the true branch of a conditional expression. Suppresses type-annotated single-parameter arrow lookahead while that colon belongs to the surrounding conditional operator.

CONTEXT_FLAG_IN_DECORATOR

Context flag: inside a decorator expression (@expr) When set, [ should not be treated as element access (it starts a computed property name)

CONTEXT_FLAG_IN_PARENTHESIZED_EXPRESSION

Context flag: parsing inside a parenthesized expression. Used to keep arrow-function/parenthesized recovery behavior consistent.

CONTEXT_FLAG_PARAMETER_DEFAULT

Context flag: parsing a parameter default (where ‘await’ is not allowed)

CONTEXT_FLAG_STATIC_BLOCK

Context flag: inside a static block (where ‘await’ is reserved)