Request

Add an optional symbols/*/Templates.js file that exports and object and can be merged into the contents of the yaml template files. 

Motivation

This will allow us to use linters and have syntax-highlighting when interacting with the language symbol templates.

Proposal

We could add a new file symbols/*/Templates.js that looks something like this:

module.exports = {
  AndSyntaxTemplate: (args) => args.join(' && ')
};

And forgo writing anything to the symbols/*/templates.yaml file:

# yaml file
AndSyntaxTemplate: &AndSyntaxTemplate null

Then when we run the loadSymbolTable function in compile-symbol-table.js we could merge the hash from the js template doing something like this:

const yamlContents = yaml.load(contents);
yamlContents.Templates = {...yamlContents.Templates, ...jsTemplates.get(outputLang)};
fs.writeFileSync(outputFile, `module.exports=${JSON.stringify(yamlContents)};\n`);