Question: Compiler API reject my node (Token end is child end; Node must have a real position for this operation)

[Jack-Works]

I make some changes to the AST and I'm getting textChange back, but I get this.

Error: Debug Failure. False expression: Token end is child end
      at processChildNode (built\local\run.js:98799:34)
      ...... ignore some irrelavant details.
      at ChangeTracker.getChanges (built\local\run.js:100405:45)
      at transformComponentToSFC (https://github.com/Microsoft/TypeScript/pull/24518/files#diff-195c9482ed99d46952200f9fed3bffb4R273)

And If I ignore this assert, I get this

     Error: Debug Failure. False expression: Node must have a real position for this operation
      at NodeObject.assertHasRealPosition (built\local\run.js:107509:22)
      at NodeObject.getStart (built\local\run.js:107515:18)
      at processChildNode (built\local\run.js:98759:47)
      ......
      at Object.getTextChangesFromChanges (built\local\run.js:100428:86)
      at ChangeTracker.getChanges (built\local\run.js:100405:45)
      at transformComponentToSFC (https://github.com/Microsoft/TypeScript/pull/24518/files#diff-195c9482ed99d46952200f9fed3bffb4R273)

The code fails at changeTracker.getChanges(), ( https://github.com/Microsoft/TypeScript/pull/24518/files#diff-195c9482ed99d46952200f9fed3bffb4R344 ), and by the second Error, it seemed I've got some node wrong. But I can't figure out which node is corrupted.

[mhegazy]

@Andy-MS can you help answering this one.

[typescript-bot]

Automatically closing this issue for housekeeping purposes. The issue labels indicate that it is unactionable at the moment or has already been addressed.

[tavurth]

Having this issue now also.

[Kingwl]

It's usually caused by overlap text range when you are editing the code. (Includes replace between child node and parent node).

There's some workaround(hijack the textChanges api and drop some changes, and than do the next round), but It' might should be done case by case.

[tavurth]

For me it seemed to be because I had a class without a type, which had public methods returning a type

interface SomeType<T> {}

class MyClass {
  myMethod<T>(): SomeType<T> {}
}

Removing the <T> fixes this
This error was only appearing when using tsoa 🤷