"extends" option not working in TypeDoc config

[WilliamJns]

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In this conversation, the idea of using extends option in the config file was raised and in this pull request was implemented, I wanted to use this feature, but unfortunately, I'm having trouble using this option.

I will present the solution that I have found to solve this problem in a new pull request.

Expected Behavior

Merge all files and options together.

Steps to reproduce the bug

1. Create a base config file to use in all typedoc configs calling base-typedoc.json.

{
  "name": "Sample Documentation",
  "readme": "./docs/index.md",
  "out": "./build-docs",
  "target": "ES5",
  "mode": "file",
  "media": "./docs/assets",
  "includeDeclarations": false,
  "ignoreCompilerErrors": true,
  "disableOutputCheck": true,
  "logger": "none",
  "theme": "sample"
}

2. Extend the created base-typedoc.json in original typedoc.json

{
  "extends": "base-typedoc.json",
  "out": "./build-docs"
}

3. Build the document using typedoc --options typedoc.json.

Environment

• Typedoc version: 0.17.3
• TypeScript version: 3.8.3
• Node.js version: 12.16.1
• OS: MacOS Catalina 10.15.4