We need better dependency diagnostic for too-old node versions

[dckc]

I just heard about release 5. I tried to follow the getting started docs to the letter; I'm losing.

connolly@jambox:/tmp/ses-5$ node ex.js 
/tmp/ses-5/ex.js:8
]
^

SyntaxError: Unexpected token ]

After fixing that typo (#114) I get:

connolly@jambox:/tmp/ses-5$ node ex.js 
/tmp/ses-5/node_modules/ses/dist/ses.cjs.js:403
  async function* aStrictAsyncGenerator() {} // eslint-disable-line no-empty-function
                ^

SyntaxError: Unexpected token *

Is my node too old?

connolly@jambox:/tmp/ses-5$ node --version
v8.14.0

If so, I think you can use some sort of engine thingy in your package.json to tell me what version(s) of node you support.

full transcript of my session: https://gist.github.com/dckc/e7bd1571c3c17110eab7110f4e319194

[erights]

Is my node too old?

yes

If so, I think you can use some sort of engine thingy in your package.json to tell me what version(s) of node you support.

I thought we had one but apparently not. Leaving this issue open for that but revising the title.

[dckc]

Diagnostics are still pretty bad using stock node v8.14.0 in Ubuntu 18.04:

$ git clone https://github.com/Agoric/SES
$ cd SES
SES$ git describe
v0.6.2-1-g2669dca
SES$ npm install
added 219 packages...
connolly@jambox:/tmp/SES$ npm test

> ses@0.6.3-dev.0 test /tmp/SES
> node scripts/build-intermediate.js && tape -r esm test/**/*.js

wrote 81048 to src/stringifiedBundle
/tmp/SES/src/bundle/anonIntrinsics.js:106
  async function* aStrictAsyncGenerator() {} // eslint-disable-line no-empty-function
                ^

SyntaxError: Unexpected token *
    at Object.Module._extensions..js (module.js:664:10)

[kriskowal]

Tracking on #22.