SyntaxError: Unexpected type cast in parameter position at left side of an assignment

[bpstrngr]

Parsed file: https://github.com/rollup/rollup/blob/master/src/ast/nodes/CatchClause.ts#L26

export default class CatchClause extends NodeBase {
        declare body: BlockStatement;
        declare param: PatternNode | null;
        declare preventChildBlockScope: true;
        declare scope: CatchScope;
        declare type: NodeType.tCatchClause;
        createScope(parentScope: Scope): void {
                this.scope = new CatchScope(parentScope, this.context);
        }
        parseNode(esTreeNode: GenericEsTreeNode): void {
                const { param } = esTreeNode;
                if (param) {
                        (this.param as GenericEsTreeNode) = new (this.context.getNodeConstructor(param.type))(
//                      ^
                                param, this,this.scope
                        );
                        this.param!.declare('parameter', UNKNOWN_EXPRESSION);
                }
                super.parseNode(esTreeNode);
        }
}

Result:

SyntaxError: Unexpected type cast in parameter position. (26:4)
    at pp.raise (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/haverbeke_2012_acorn/0/acorn/src/location.js:15:13)
    at TypeScriptParser.raiseCommonCheck (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:5008:44)
    at TypeScriptParser.raise (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:5014:29)
    at TypeScriptParser.toAssignable (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:4294:34)
    at TypeScriptParser.parseMaybeAssignOrigin (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:4037:37)
    at TypeScriptParser.parseMaybeAssign (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:4092:33)
    at pp.parseExpression (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/haverbeke_2012_acorn/0/acorn/src/expression.js:98:19)
    at pp.parseStatement (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/haverbeke_2012_acorn/0/acorn/src/statement.js:151:45)
    at TypeScriptParser.parseStatement (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/tyrealhu_2023_acorn_typescript.js:3582:30)
    at pp.parseBlock (file:///mnt/chromeos/GoogleDrive/MyDrive/blik/haverbeke_2012_acorn/0/acorn/src/statement.js:436:21) {
  pos: 977,
  loc: Position { line: 26, column: 4 },
  raisedAt: 1011
}

[bpstrngr]

By the way, if you didn't mind, would you perhaps have a little insight to offer about how you figure where to intercept the parser inheritence always so quickly? I suppose it's mostly about being familiar with the control flow (such as perhaps calling some type cast parse method in parseMaybeAssignOrigin here, either in error handling or heuristically), but if therein might be some tricks that help determining the TS/vanilla bifurcations it could help taking a stab at PR-s.

[TyrealHu]

fix in version acorn-typescript@1.4.6