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

[Pirate Praveen]

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>(

>