Markdown Code Highlight failed to parse Shell/Bash language

[TechQuery]

Expected Behavior

Parse Shell/Bash code blocks in Markdown with no error, like what 0.19.x versions do.

Actual Behavior

Warning: Unsupported highlight language "shell" will not be highlighted
Warning: Unsupported highlight language "bash" will not be highlighted
Warning: Missing type converter for type: this
Warning: Missing type converter for type: false

Steps to reproduce the bug

• tsconfig.json
• CI logs

Environment

• Typedoc version: 0.20.1
• TypeScript version: 3.9.7
• Node.js version: 14.15.0
• OS: Windows 10 Pro 2004

[Gerrit0]

shell, sh, and bash will be mapped to the shellscript language in 0.20.2
true/false/this/null type converters - took me a while to see this... it's only a problem with old TS versions. Should also be fixed in 0.20.2.