Cannot read property 'map' of undefined in deconflictConstructorDeclaration

• Version: 1.3.1
• Rollup Version: 2.23.0
• Operating System and version (if applicable): N/A
• Node Version (if applicable): N/A
• Does it work with tsc (if applicable): ✅

Reproduction

N/A (yet)

Debug work done so far:

1. Inserted a breakpoint in deconflictConstructorDeclaration.
2. Noted the value of node.

node.kind === 162;
node.flags === 8;
typeof node.parameters === 'undefined';
node.original.kind === 162;
node.original.flags === 256;
Array.isArray(node.original.parameters) === true;

1. Noted the value of node.original.getText().

private constructor(
    readonly kind: SourceModuleDependencyKind,
    readonly spec: string,
    readonly locations: ReadonlyArray<SourceLocation>,
    readonly options: SourceModuleOptions = {}
  ) {}

My wild guess is that there may be something weird going on with private constructors.

Expected Behavior

• Builds successfully

Actual Behavior

• Throws uncaught exception

[wessberg]

Alright, this has been fixed now. This only breaks in TypeScript versions before v4, but is related to this issue that I’ve just reported over at the TypeScript repo. I’ve added a simple null-check to avoid running into this pitfall. It has been released as part of v1.3.4

[ggoodman]

Just took a look at your issue. I bet you’re navigating a bit of a minefield of these sort of strictly-typed (except when they’re not) gotchas. Amazing work!