Error: Unknown type: IndexedAccessType

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Expected Behavior

The problem already was discussed in #862. Type resolver throws this error when you use a type like this:

export const MessageState: {
  pending: 'pending',
  available: 'available'
};

export type MessageState = (typeof MessageState)[keyof typeof MessageState]

Generate routes error.
 Error: Unknown type: IndexedAccessType
At: controllers/Controller.ts:16:16.
This was caused by 'type MessageState = (typeof MessageState)[keyof typeof MessageState]'
    at new GenerateMetadataError (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/exceptions.ts:6:5)
    at TypeResolver.resolve (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:318:13)
    at TypeResolver.getTypeAliasReference (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:617:120)
    at TypeResolver.getReferenceType (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:585:30)
    at TypeResolver.resolve (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:359:32)
    at /my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:107:127
    at Array.reduce (<anonymous>)
    at TypeResolver.resolve (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:106:10)
    at TypeResolver.getTypeAliasReference (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:617:120)
    at TypeResolver.getReferenceType (/my_project/node_modules/@tsoa/cli/src/metadataGeneration/typeResolver.ts:585:30)

Possible Solution

Solution suggested in #862:

// file: packages/cli/src/metadataGeneration/typeResolver.ts
// ↓added
if (ts.isIndexedAccessTypeNode(this.typeNode)) {
  return new TypeResolver(this.typeNode.indexType, this.current, this.typeNode, this.context, this.referencer).resolve();
}
// ↑added

if (ts.isParenthesizedTypeNode(this.typeNode)) {
...

It resolves this particular case but doesn’t resolve the case when using different object types with the same indexes:

const a = {
  a: 1,
  d: 4
} as const

const b = {
  a: "a",
  d: "d"
} as const

type Works = keyof typeof b // "a" | "d"
type Works = (typeof b)[keyof typeof b] // "a" | "d"
type NotWorks = (typeof a)[keyof typeof b] // 1 | 4

Context (Environment)

Version of the library: 3.14.0 Version of NodeJS: 14.13.1

• Confirm you were using yarn not npm: [x]

[relentlessricktrinidad]

Any update on this? We are currently using Prisma to generate our typescript definitions and this issue is preventing us from continuing unfortunately.

[WoH]

Should be fixed in #1160