SyntaxError: 'import' and 'export' may appear only with 'sourceType: module'

[tmanderson]

I'm seeing this error:

`SyntaxError: 'import' and 'export' may appear only with 'sourceType: module'`

Sorry if this is completely my mistake, but I can't seem to find anything in the README referring to the sourceType: module setting?

My package.json contents:

"engines": {
  "node": "8.1.2"
},
"dependencies": {
  "@std/esm": "^0.3.0",
  "chalk": "^2.1.0"
},
...
"esm": {
  "esm": "all",
  "cjs": true
}

I'm running my script with the following command:

$> node -r @std/esm src/index.js

Where index.js contains:

'use module';
import chalk from 'chalk';

I've also tried import chalk from './node_modules/chalk and ./node_modules/chalk/index with no luck.

I have verified that chalk is installed. Thanks!

[jdalton]

Hi @tmanderson!

That's a parse error from acorn. I'm unable to repro in similating your setup.
Would you mind creating a simple repro repo so that I can take a look?

[tmanderson]

Heya, @jdalton – sure can!

[jdalton]

Thanks @tmanderson!

You've got the options specified incorrectly.
It should be the key "@std/esm": { "esm":"all", "cjs":true }. Your path to chalk can be restored to just "chalk" after that. Also since you've specified "all" for your esm support the "use module" directive isn't required. 😋

[tmanderson]

@jdalton, ah! I gotcha. Had a feeling it might be something like that.

Thanks for the quick response!

[jdalton]

BTW I updated the parser error message to avoid confusion with @std/esm options.

[tmanderson]

Ah, very nice. I'm hoping that'll save someone from the same mistake!

Thanks again.

[theKashey]

@jdalton - you should clearly indicate in README that one has to include additional information into the packages.json, or "this magic" will not work.
As I think - most if people will try to run this with *.js file, not mjs.
In ideal - add the ability to execute anything in all mode.

[jdalton]

@theKashey I do

[theKashey]

Yep, but this is not very clear :(

Will NOT work out of the box for JS files. See below.

As for me - I have read the medium article, tried to run scripts, checked readme.. And understand my problem only here.

[jdalton]

@theKashey Would you be up for creating a PR to update the readme?

[theKashey]

Will do my best.