How to resolve issues with missing parsers? (eg, optionalChaining)

[Nantris]

Is your feature request related to a problem? Please describe.
Is it possible to use configure electronNegativity to use the necessary parsers? I can't find any information on that.

The exact message I get is: This experimental syntax requires enabling the parser plugin: 'optionalChaining'

I'm not sure how I'd go about configuring Electronegativity to understand this syntax. Am I overlooking something obvious?

[phosphore]

You may want to try to install the Babel's optionalChaining experimental plugin and add it to the Electronegativity's.eslintrc.json file. In Electronegativity, parsers are not that configurable per-se (I can only think about this .eslintrc.json file and maybe some options where they are instantiated), so I'm afraid that if the above doesn't work you'll need to actually edit Electronegativity's/Babel's plugin source to achieve that.

[Nantris]

Thanks for your reply @phosphore!

That's an interesting idea that I'll look into. Did you mean the .babelrc file though? Or does Electronegativity's parsing somehow rely on .eslintrc.json?

[phosphore]

My bad, we use both Esprima and Babel, eslintrc is instead used for ESLintTraverser (for AST parsing). Babel's plugins should be set in:

electronegativity/src/parser/parser.js

Lines 29 to 40 in 4db147d

	parseBabel(content) {
	let plugins = [
	"jsx",
	"objectRestSpread",
	"classProperties",
	"optionalCatchBinding",
	"asyncGenerators",
	"decorators-legacy",
	"flow",
	"dynamicImport",
	"estree",
	];

[Nantris]

That's a huge help! Thanks so much!

I'll mark this as unread and when I get a chance to look into this further I'll report back.

[robotickamote]

Hi Guys, any news on this issue?

[bchurchill]

I'm thinking about adding a command line option to specify additional parser plugins. That way plugins can be specified at run time, or by using the programmatic interface.

[phosphore]

Sorry about the delay merging this! Now 2d2cc9b is in master!

[tessro]

We're eager to adopt electronegativity – are you planning to release a version with this feature?

[phosphore]

I'll be working on the repository this incoming week and I'll release a new minor before EOW!

[tessro]

Amazing, thank you!!