symbol.declarations, symbol.valueDeclaration and signature.declaration
return nodes, as tsc-ts's Symbol and Signature do, instead of the
facade's declarationsOf, valueDeclarationOf and signatureDeclaration
resolving their handles. Each symbol and signature resolves its handles
in its own project on first read and keeps the nodes. The handles stay
available as declarationHandles, valueDeclarationHandle and
declarationHandle.
A program's checker and its symbols belong to the same project, so the
nodes are the ones the facade returned. The frontend's 432 calls of the
three facade methods become property reads, and the methods and their
caches go.
The frontend's node lists become node lists, { pos, end, nodes }, the
shape of tsc-ts's NodeList, so that the frontend can later read tsc-ts's
own nodes. AstNode's list getters return an AstNodeList, ts.NodeArray<T>
is that class, and the frontend reads a list's elements through nodes.
The lists already carried their positions on the wire.
The class is the type, not a structural interface, because native code
represents a class and a record differently.
A decoded file keeps each list's nodes array, as before, and each read
of a list field returns a new AstNodeList over it, so the file holds no
more objects than before. nodes keeps its identity; a list object is not
the same object on each read.
The change is mechanical: a type-aware rewrite of each list field read,
plus hand edits where lists are read through casts, generic accessors
or test mocks. The generated getters and types follow from
generate-ts7-ast-schema.mjs. AstFile and Ts7Session drop their unused
listMetadata hook.
Chris Tate