Move build packages to TypeScript

[filipsobol]

Suggested merge commit message (convention)

Other (build-balloon): Rewrite ckeditor5-build-balloon into Typescript. Closes #13000.

Other (build-balloon-block): Rewrite ckeditor5-build-balloon-block into Typescript. Closes #13001.

Other (build-classic): Rewrite ckeditor5-build-classic into Typescript. Closes #13002.

Other (build-decoupled-document): Rewrite ckeditor5-build-decoupled-document into Typescript. Closes #13003.

Other (build-inline): Rewrite ckeditor5-build-inline into Typescript. Closes #13004.

[arkflpc]

tsconfig files are missing.

Please verify if any changes are needed in package.json(s).

[arkflpc]

Please verify if any changes are needed in package.json(s).

CC: @pomek

[pomek]

Do you think it would work at all?

ckeditor5/packages/ckeditor5-build-balloon-block/webpack.config.js

Line 27 in b14f306

filename: 'ckeditor.js',

Webpack configuration should be aligned too. Also, I think the tsconfig.json will be required. Other than that, it should be fine. Please, let me know when R+, so I will jump here and make a few tests.

[pomek]

The _src directory is not needed here. CKEditor 5 builds do not provide any documentation.

[filipsobol]

I updated the PR and yarn build commands in all of these packages seem to be working fine after minor update to the webpack configuration. @arkflpc @pomek

[pomek]

We may want to publish typings for builds too.

• I would redesign tsconfig.json:

   {
     "extends": "../../tsconfig.release.json",
     "compilerOptions": {
       "sourceMap": true
     },
     "include": [
       "./src/",
       "../../typings/"
     ],
     "exclude": [
       "./tests/"
     ]
   }

  Let's use the release config as a base and generate source maps as builds export them.

• Then, we need to update package.json:

  • Add src/ckeditor.d.ts to files.
  • Add the types field pointing to the src/ckeditor.d.ts file.

Unfortunately, I am not sure if we go the right direction.

[filipsobol]

Today we were discussing how we should publish typings and how other libraries do it. This will require further research, but AFAIK the approach you described is the most popular and the one I used in the past.

Because we are already using webpack to build the package, we can use emitDeclarationOnly option, so that tsc will only output .d.ts files and skip the build step. See this commit for more details: 65de1ce @pomek

[pomek]

Please, update the merge message. We do not convert html-support.

LGTM.