Error with nested tsconfig extends

[raveclassic]

Hi!
Recent typescript supports configuration inheritance via "extends" in tsconfig.json. Everything's working until extended config tries to extend another itself.
Example:

//tsconfig.json
{
 "extends": "./tsconfig.a.json"
}

//tsconfig.a.json
{
 "extends": "./tsconfig.b.json",
}

//tsconfig.b.json
{
 "compilerOptions": {
 }
}

An error occures: TypeError: Cannot convert undefined or null to object at typedoc\dist\lib\utils\options\readers\tsconfig.js:60 when trying to delete compilerOptions[key];.
Seems like data.raw does not contain compilerOptions at all.

ts: 2.1.5
typedoc: 0.5.5

[DennisJaamann]

+1, having the same issue:

• NodeJS 7.0.0
• TypeScript 2.2.0-dev.20161212
• TypeDoc 0.5.5

[lddubeau]

If I install 0.5.5, I can reproduce the problem without any use of "extends". I just need to have a tsconfig.json that contains {} and the error occurs.

I cannot reproduce the problem with typedoc 0.7.1. Consequently, this should be closed.

[aciccarello]

Reopening due to questions raised in #1089