Access the list of render errors

Hi! 👋 This seems like a great library.

We’re using liquid-ruby for our customers to be able to customize some of their templates. We want to use liquidjs to do client-side previews and error parsing, so we can give the customers fast feedback while avoiding a round-trip to our server’s precious resources.

In Ruby liquid, when rendering a template, an array of the errors is available afterwards, which can be used to display to the client. I’ve looked through the docs/repo, and liquidjs seems to behave very differently from liquid-ruby in this way.

Ruby example:

options = options = { strict_variables: true, strict_filters: true }
template = Liquid::Template.parse(markup)
result = template.render(context, options)

# Lots of errors to look at here
template.errors.each do |error|
  puts error
end

With the same markup and options as the Ruby version, liquidjs throws one error and quits.

const engine = new Liquid()
const template = engine.parse(markup)

// This throws a single error
const result = engine.renderSync(template, {}, { strictFilters: true, strictVariables: true })

I’m surprised this doesn’t exist yet, but I’m guessing liquidjs is used more for server templates?

Is this possible to do with liquidjs or are we out of luck? Thanks!

[harttle]

An additional method or a catchAllErrors defaults false or failFast defaults true argument will be better, or this feature will be a breaking change.

[bbugh]

Great, thank you for confirming my assumptions. If we decide to move forward with the client-side approach, I will see about a PR. It looks like handling errors happens in renderTemplates. It seems like that could return an object instead of a string, like { result: string, errors: LiquidError[] }. So as not to break the end-user API, the render function could still return a string, but keep the errors in engine. Does that seem plausible or am I way off?