0.19.0 broke support for typescript 3.9.7

[Dergash]

Recent upgrade to typescript 4.*.* in 0.19.0 broke backward-compatibility for typescript 3.9.7 due to the unchecked usage of ts.isNamedTupleMember call: e136469#diff-b580b34740b3647ff5b29f4cb299a61aR77
which results in the following output when trying to generate documentation with TS 3.9.7:

C:\projects\tesler-ui\node_modules\typedoc\dist\lib\converter\types\tuple.js:44
        return ts.isNamedTupleMember(node);
                  ^

TypeError: ts.isNamedTupleMember is not a function

I believe the change was introduced due to #1357.

Investigating further I've also found that the 0.17.0 also broke support for typescript 3.7.3 (which is version used in create-react-app
typescript template) due to the unchecked usage of ts.isIdentifierOrPrivateIdentifier: 5d41a2e#diff-560fefcd039cbf06578d6f95c3e57753R413

I've prepared a PR to restore backward compatibility.

I've also found following issues warning about not following declared peer dependency: #1240, #1257, #979

Although I'll agree that backward compatibility might be not a requirement for 0.*.* library and peer dependency are indeed warn you, broken typescript versions are pretty recent and the fix is pretty simple and non-invasive so it'll be nice to support those versions until typescript 4 stabilizes a bit so majority typedoc users may migrate to 4.*.*

Search terms

isNamedTupleMember, isIdentifierOrPrivateIdentifier, typescript 3

Expected Behavior

typedoc is backward compatible for typescript versions 3.7.3 and 3.9.7

Actual Behavior

yarn typedoc command results in the following output on the project with typescript 3.9.7:

Using TypeScript 3.9.7 from C:\projects\tesler-ui\node_modules\typescript\lib
C:\projects\tesler-ui\node_modules\typedoc\dist\lib\converter\types\tuple.js:44
        return ts.isNamedTupleMember(node);
                  ^

TypeError: ts.isNamedTupleMember is not a function

Steps to reproduce the bug

I've prepared an example project to reproduce the bug:
https://github.com/Dergash/typedoc-tamed-tuples (master branch for 3.7.3 example, 3.9.7 branch for 3.9.7)
Just clone it, yarn install, yarn typedoc and you'll receive the output

Environment

• Typedoc version: 0.19.0, https://registry.yarnpkg.com/typedoc/-/typedoc-0.19.0.tgz#438ae5a8e631322e3fc21f6068f2729ff15b18b9
• TypeScript version: 3.9.7, 3.7.4
• Node.js version: v14.5.0
• OS: Windows 10 Pro 19041.450

[wsz7777]

I miss this problem too, when I can use it with no error?

[ibwei]

I got this problem too...

[Dergash]

@wsz7777 @ibwei
I now believe that it is technically not a bug but a feature request as typescript 4.0.2 is properly declared as a peer dependency.

So if this backward compatibility feature will not be merged I think the following options are available to you:

1. Update typescript to 4.0.2 in your project to accommodate the peer dependency
2. Use typedoc 0.18.0 as a strict dependency in your file, which supports typescript >= 3.8.3:
   your package.json:

"devDependencies": {
     "typedoc": "0.18.0"
}

or just yarn add typedoc@0.18.0
3) I've published a forked version of 0.19.0 with related fix that you can use until you find possible to upgrade typescript:

"devDependencies": {
     "@tesler-ui/typedoc": "0.19.0-typescript-3"
}

or just

yarn remove typedoc
yarn add @tesler-ui/typedoc

or you could fork yourself and implement changes and fix yourself using linked PR as a reference.

[wsz7777]

thank you ,in my project use typescript around packages with @4.x can solve this problem.

"typescript": "^4.0.2",
"jest": "^26.4.2",
"ts-jest": "^26.3.0",
"@types/jest": "^26.0.13",
"@typescript-eslint/eslint-plugin": "^4.0.1",
"@typescript-eslint/parser": "^4.0.1",

[ibwei]

@wsz7777 @ibwei
I now believe that it is technically not a bug but a feature request as typescript 4.0.2 is properly declared as a peer dependency.

So if this backward compatibility feature will not be merged I think the following options are available to you:

1. Update typescript to 4.0.2 in your project to accommodate the peer dependency
2. Use typedoc 0.18.0 as a strict dependency in your file, which supports typescript >= 3.8.3:
   your package.json:

"devDependencies": {
     "typedoc": "0.18.0"
}

or just yarn add typedoc@0.18.0
3) I've published a forked version of 0.19.0 with related fix that you can use until you find possible to upgrade typescript:

"devDependencies": {
     "@tesler-ui/typedoc": "0.19.0-typescript-3"
}

or just

yarn remove typedoc
yarn add @tesler-ui/typedoc

or you could fork yourself and implement changes and fix yourself using linked PR as a reference.

thank you very much. I updated my typescript version according to your instructions, and the problem was solved.

[Gerrit0]

As discussed a bit in #1361, supporting old versions of TypeScript isn't really what I'd like to focus the time I have for this project on. typedoc@0.19.1 reintroduces support for typescript@3.9 thanks to @Dergash, and I think supporting one minor version older than the current version is feasible, so will try to do that... If you're still on an older version of TypeScript than that, upgrade!

[thekennysong]

As what others said I upgraded to "typescript": "^4.0.2" and it works great now. Thanks all!