microsoft / microsoft/TypeScript

New error: Type instantiation is excessively deep and possibly infinite.

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Description

This one's actually new in 3.8. There are some additional errors in 3.9 - I'll post them below.

https://github.com/davidkpiano/xstate/blob/2e0bd5dcb11c8ffc5bfc9fba1d3c66fb7546c4bd/packages/core/src/stateUtils.ts#L157

packages/core/src/stateUtils.ts:157:36 - error TS2589: Type instantiation is excessively deep and possibly infinite.

157   return getValueFromAdj(rootNode, getAdjList(config));
                                       ~~~~~~~~~~~~~~~~~~

packages/core/src/State.ts:181:12 - error TS2589: Type instantiation is excessively deep and possibly infinite.

181     return new State(config);
               ~~~~~~~~~~~~~~~~~

packages/core/src/interpreter.ts:208:5 - error TS2589: Type instantiation is excessively deep and possibly infinite.

208     this.parent = parent;
        ~~~~~~~~~~~~~~~~~~~~

packages/core/src/interpreter.ts:783:13 - error TS2345: Argument of type '{ type: string; data: any; }' is not assignable to parameter of type 'string | EventObject | Event<EventObject>[] | Event<EventObject>'.
  Object literal may only specify known properties, and 'data' does not exist in type 'EventObject'.

783             data: err
                ~~~~~~~~~

To repro:

  1. yarn
  2. tsc -b -f tsconfig.monorepo.json

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Run yarn and tsc -b -f tsconfig.monorepo.json in the linked xstate revision. Start by reading packages/core/src/stateUtils.ts:157, packages/core/src/State.ts:181, and packages/core/src/interpreter.ts:208 and 783. Done means the reported TS2589 and TS2345 errors no longer appear in the reproduction build.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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