Es test

[hildjj]

Allow testing of es modules. Fixes #399

[frostburn]

Tests succeed on my end. I'm not familiar with the issues in this PR. Is there something that I could test manually that is broken on main and this one fixes?

[hildjj]

This should fail on main, but pass on this branch:

echo "foo = '1'" | bin/peggy.js --format es -t 1

unless you run this branch on node 20.7 or earlier, then it should fail with a version error.

[hildjj]

All of the interesting stuff is now in bin/fromMem.js. It shouldn't actually be security-relevant, even though it looks like it. All of those gyrations are there so that import and require work relative to the output directory (which is the input directory by default).

[frostburn]

This should fail on main, but pass on this branch:

echo "foo = '1'" | bin/peggy.js --format es -t 1

unless you run this branch on node 20.7 or earlier, then it should fail with a version error.

Apparently my version of Ubuntu ships with node version 18.13.0 so I get the expected failure. (Don't feel like messing around with updates right now...)

On main I get:

Error running test
Unexpected token 'export'

[hildjj]

Good, that works as expected. I like to use npm -g install nve and nve 21 ./bin/peggy ... to use different node versions without having to change what is installed globally.

[frostburn]

Thanks!

$ echo "foo = '1'" | nve 21 node --experimental-vm-modules ./bin/peggy.js --format es -t 1
'1'