js.raw doesn't accept import.meta

[cometkim]

The import.meta is a widely supported standard by modern browsers.

I recently tried to use it for HMR on Snowpack, but the ReScript compiler ([email protected]) didn't seem to support it.

   8 │
   9 │ %%raw(`
  10 │ if (import.meta.hot) {
  11 │   import.meta.hot.accept();
  12 │ }

  Unexpected token `.`, expected the token `(`

FAILED: cannot make progress due to previous errors.
>>>> Finish compiling(exit: 1)

It seems that this is still not implemented on the Flow side. facebook/flow#6913

Can we add support for this separately?

[bobzhang]

we will have a flag to loosen the checks

[bobzhang]

we turned flow parse error into a warning 103 which you can turned off:

@@config({
  flags: ["-w", "-103"],
})

%%raw(`
if (import.meta.hot){
  console.log('es6')
}
`)

[bobzhang]

fixed in #4932

[TheSpyder]

I can't get this to work in reasonml syntax? I've tried both [@config {flags: ["-w", "-103"]}] at the top of the file and [@warning "-103"] next to the raw definition.

The code generating the warning is:

  let currentDir: string =
    [%raw "import.meta.url"]->Path.dirname->String.sliceToEnd(~from="file://"->String.length);

(where Path comes from reason-nodejs and String is Js.String2)

[cometkim]

at least the parsing error is now resolved: facebook/flow@0851b3e