JavaScript/TypeScript language adapter for MetaAST transformations.

Converts JS/TS source directly into MetaAST 3-tuples using regex-based line-by-line scanning. This is a BEAM-native adapter that does NOT require a subprocess or external parser.

M1 Representation

The "native AST" (M1) for this adapter IS the MetaAST itself — we perform a single-pass translation directly from source text to MetaAST rather than going through an intermediate language-specific AST. This means parse/1 returns the MetaAST tuple and to_meta/1 is an identity pass.

MetaAST Nodes Produced

• {:container, meta, children} — ES6 classes and the file-level module
• {:function_def, meta, body} — function declarations, arrow functions, class methods, and object-literal methods
• {:function_call, meta, args} — call expressions found on each line
• {:import, meta, []} — import … from and require(…) statements
• {:param, meta, name} — function parameters

Limitations

• Read-only adapter (analysis only, no code generation)
• Computed / anonymous method names are skipped
• TypeScript type annotations are stripped (parameter count preserved)
• Generic/template types are ignored
• Complex destructured parameter lists use param-count approximation