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aa2fb29fa6
This commit is a complete reimplementation of our theme JS compilation system. Previously, we compiled theme JS into AMD `define` statements on a per-source-file basis, and then concatenated them together for the client. These AMD modules would integrate with those in Discourse core, allowing two way access between core/theme modules. Going forward, we'll be moving away from AMD, and towards native ES modules in core. Before we can do that, we need to stop relying on AMD as the 'glue' between core and themes/plugins. This change introduces Rollup (running in mini-racer) as a compiler for theme JS. This is configured to generate a single ES Module which exports a list of 'compat modules'. Core `import()`s the modules for each active theme, and adds them all to AMD. In future, this consumption can be updated to avoid AMD entirely. All module resolution within a theme is handled by Rollup, and does not use AMD. Import of core/plugin modules from themes are automatically transformed into calls to a new `window.moduleBroker` interface. For now, this is a direct interface to AMD. In future, this can be updated to point to real ES Modules in core. Despite the complete overhaul of the internals, this is not a breaking change, and should have no impact on existing themes. If any incompatibilities are found, please report them on https://meta.discourse.org. --------- Co-authored-by: Jarek Radosz <jarek@cvx.dev> Co-authored-by: Chris Manson <chris@manson.ie>
60 lines
1.3 KiB
Ruby
60 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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class ThemeJavascriptCompiler
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class CompileError < StandardError
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end
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@@terser_disabled = false
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def self.disable_terser!
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raise "Tests only" if !Rails.env.test?
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@@terser_disabled = true
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end
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def self.enable_terser!
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raise "Tests only" if !Rails.env.test?
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@@terser_disabled = false
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end
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def initialize(theme_id, theme_name, settings = {}, minify: true)
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@theme_id = theme_id
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@input_tree = {}
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@theme_name = theme_name
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@minify = minify
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@settings = settings
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end
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def compile!
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if !@compiled
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@compiled = true
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@input_tree.freeze
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output =
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DiscourseJsProcessor::Transpiler.new.rollup(
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@input_tree.transform_keys { |k| k.sub(/\.js\.es6$/, ".js") },
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{ themeId: @theme_id, settings: @settings, minify: @minify && !@@terser_disabled },
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)
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@content = output["code"]
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@source_map = output["map"]
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end
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[@content, @source_map]
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rescue DiscourseJsProcessor::TranspileError => e
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message = "[THEME #{@theme_id} '#{@theme_name}'] Compile error: #{e.message}"
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@content = "throw new Error(#{message.to_json});\n"
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[@content, @source_map]
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end
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def content
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compile!
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@content
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end
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def source_map
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compile!
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@source_map
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end
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def append_tree(tree)
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@input_tree.merge!(tree)
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end
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end
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