[Pkg-javascript-devel] babel 7 bootstrap problem and reify

[Pirate Praveen]

On ചൊ, Jan 21, 2020 at 13:20, Pirate Praveen 
<praveen at onenetbeyond.org> wrote:
> 
> 
> On തി, Jan 20, 2020 at 21:45, Pirate Praveen 
> <praveen at onenetbeyond.org> wrote:
>> Hi,
>> 
>> Just came across this module today https://github.com/benjamn/reify 
>> I was wondering if we could use this module to load ES6 files of 
>> babel directly (as we are stuck trying to build babel 7 and it 
>> needs babel 7 to build).
>> 
>> Comments?
>> 
>> Praveen
>> 
> 
> With the following lines in .babelrc, some packages/* can be build 
> with babeljs 6.
> 
> {
>  "presets": [
>      "env",
>      "flow"
>  ],
>  "plugins": [
>    [
>      "transform-object-rest-spread",
>    ]
>  ],
> }
> 
> babeljs packages/babel-plugin-proposal-class-properties/src -d 
> packages/babel-plugin-proposal-class-properties/lib
> 
> packages/babel-plugin-proposal-class-properties/src/index.js -> 
> packages/babel-plugin-proposal-class-properties/lib/index.js
> 
> But some packages are using babel 7 only plugins. For example, 
> building babel-core fails with this error. Anyone knows which plugin 
> is used here?
> 
> babeljs packages/babel-core/src/ -d packages/babel-core/lib
> SyntaxError: packages/babel-core/src/config/caching.js: Unexpected 
> token (49:56)
>  47 | handler: (ArgT, CacheConfigurator<SideChannel>) => 
> Handler<ResultT> | ResultT,
>  48 | ): (ArgT, SideChannel) => Handler<ResultT> {
> > 49 | return makeCachedFunction<ArgT, ResultT, SideChannel, 
> *>(WeakMap, handler);
>     | ^
>  50 | }
>  51 |
>  52 | export function makeWeakCacheSync<ArgT, ResultT, SideChannel>(

Jishnu identified it as flow syntax and probably we can get rid of it 
with an updated version of
https://www.npmjs.com/package/flow-remove-types