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Load a Prism grammar only when a blob names it

1b8675b19e70346d6d02d5fc0c10538f50bf94b2 · Keenan Nemetz · 9d ago · parent 11720250 

Load a Prism grammar only when a blob names it

The worker imported prism-languages.min.js — every grammar Prism ships — on
every code page. That is 546 KB to evaluate before the first token, and a page
showing one Go file paid it for all 293 components.

Each component is now vendored as its own file, and prism-manifest.js maps a
language name to the files that define it in dependency order. The worker
starts with Prism's core and the manifest and imports a language's files the
first time a job names it, remembering what it has run so a file is never
imported twice. A Go blob loads 30 KB instead of 564 KB; a .tsx blob, the
widest common entry at 8 files, loads 49 KB.

The manifest also carries the components that register no language of their
own but change one: css-extras, js-extras, js-templates, php-extras, xml-doc.
Each is placed after the grammar it rewrites and included in the entries that
inherit it, so a language that extends javascript now gets js-extras' arrow
and maybe-class-name tokens too. The old bundle's order handed those to some
inheriting languages and not others; nothing loses a token.

scripts/vendor-prism.py writes the grammars and the manifest, and --check
compares them byte for byte with cdnjs. TestPrismLanguagesAreVendored,
TestPrismGrammarsMatchTheManifest and TestPrismWorkerLoadsGrammarsOnDemand
hold the server's extension table, the vendored set and the worker's lazy
import together.

server/web/static/prism-languages/jsstacktrace.js +1

@@ -0,0 +1 @@
1 Prism.languages.jsstacktrace={"error-message":{pattern:/^\S.*/m,alias:"string"},"stack-frame":{pattern:/(^[ \t]+)at[ \t].*/m,lookbehind:!0,inside:{"not-my-code":{pattern:/^at[ \t]+(?!\s)(?:node\.js|<unknown>|.*(?:node_modules|\(<anonymous>\)|\(<unknown>|<anonymous>$|\(internal\/|\(node\.js)).*/m,alias:"comment"},filename:{pattern:/(\bat\s+(?!\s)|\()(?:[a-zA-Z]:)?[^():]+(?=:)/,lookbehind:!0,alias:"url"},function:{pattern:/(\bat\s+(?:new\s+)?)(?!\s)[_$a-zA-Z\xA0-\uFFFF<][.$\w\xA0-\uFFFF<>]*/,lookbehind:!0,inside:{punctuation:/\./}},punctuation:/[()]/,keyword:/\b(?:at|new)\b/,alias:{pattern:/\[(?:as\s+)?(?!\s)[_$a-zA-Z\xA0-\uFFFF][$\w\xA0-\uFFFF]*\]/,alias:"variable"},"line-number":{pattern:/:\d+(?::\d+)?\b/,alias:"number",inside:{punctuation:/:/}}}}};