Adaptor tests will fail in node19

[josephjclark]

Node 19 is getting stricter about ESM modules and removing the --experimental-module-specifier flag.

Here are some big changes coming to node19 which will catch us out:

• Relative imports MUST have a file extension (ie import {} from './Adaptor becomes import {} from './Adaptor.js)
• Folder imports will not work ((ie import {} from './src becomes import {} from './src/index.js)
• lodash-fp, which many adaptors depend on, is deprecated. Strictly speaking we should be using lodash/fp, although this isn't itself ESM compliant (see lodash/issues/5285)

The upshot of all this is that tests and maybe builds will fail when we upgrade node beyond v18.

I actually thought the experimental arguments enabled future features early. Turns out they're actually masking deprecated functionality. Whoops - that's my bad.

Note that this doesn't affect any of the built and deployed adaptors - those are ESM and CJS compliant.

[josephjclark]

Switching to @swc/loader should fix this - see OpenFn/kit#833 for reference