Lazy-load highlight.js

This commit moves the import of highlight.js into a `require.ensure`
block, that is only executed when a code-block is actually present
in a note. Webpack automatically splits the library into a separate
chunk and loads that on demand.

The call to `hljs.listLanguages()` in `index.js` is also replaced
by a static list. This is important, as `index.js` would otherwise
need to import highlight.js, which would cause the quite big
library to be included into nearly every entrypoint, needlessly
increasing the transferred code size.

Signed-off-by: David Mehren <git@herrmehren.de>
This commit is contained in:
David Mehren 2021-06-06 22:20:29 +02:00
parent 5b8b76135b
commit 7ff685933e
No known key found for this signature in database
GPG key ID: 185982BA4C42B7C3
3 changed files with 201 additions and 39 deletions

View file

@ -3,7 +3,6 @@
/* global moment, serverurl */
import Prism from 'prismjs'
import hljs from 'highlight.js'
import PDFObject from 'pdfobject'
import S from 'string'
import { saveAs } from 'file-saver'
@ -525,13 +524,19 @@ export function finishView (view) {
value: Prism.highlight(code, Prism.languages.makefile)
}
} else {
code = S(code).unescapeHTML().s
const languages = hljs.listLanguages()
if (!languages.includes(reallang)) {
result = hljs.highlightAuto(code)
} else {
result = hljs.highlight(reallang, code)
}
require.ensure([], function (require) {
const hljs = require('highlight.js')
code = S(code).unescapeHTML().s
const languages = hljs.listLanguages()
if (!languages.includes(reallang)) {
result = hljs.highlightAuto(code)
} else {
result = hljs.highlight(reallang, code)
}
if (codeDiv.length > 0) codeDiv.html(result.value)
else langDiv.html(result.value)
})
return
}
if (codeDiv.length > 0) codeDiv.html(result.value)
else langDiv.html(result.value)

View file

@ -18,7 +18,6 @@ import { ot } from '../vendor/ot/ot.min.js'
import { saveAs } from 'file-saver'
import randomColor from 'randomcolor'
import store from 'store'
import hljs from 'highlight.js'
import url from 'wurl'
import { Spinner } from 'spin.js'
@ -106,36 +105,198 @@ const cursorActivityDebounce = 50
const cursorAnimatePeriod = 100
const supportContainers = ['success', 'info', 'warning', 'danger']
const supportCodeModes = [
'javascript',
'typescript',
'jsx',
'htmlmixed',
'htmlembedded',
'css',
'xml',
'clike',
'1c',
'abnf',
'accesslog',
'actionscript',
'ada',
'angelscript',
'apache',
'applescript',
'arcade',
'arduino',
'armasm',
'asciidoc',
'aspectj',
'autohotkey',
'autoit',
'avrasm',
'awk',
'axapta',
'bash',
'basic',
'bnf',
'brainfuck',
'cal',
'capnproto',
'ceylon',
'c',
'clean',
'c-like',
'clojure',
'ruby',
'python',
'shell',
'php',
'sql',
'haskell',
'coffeescript',
'yaml',
'pug',
'lua',
'clojure-repl',
'cmake',
'nginx',
'perl',
'sass',
'r',
'coffeescript',
'coq',
'cos',
'cpp',
'crmsh',
'crystal',
'csharp',
'csp',
'css',
'dart',
'delphi',
'diff',
'django',
'd',
'dns',
'dockerfile',
'tiddlywiki',
'mediawiki',
'dos',
'dsconfig',
'dts',
'dust',
'ebnf',
'elixir',
'elm',
'erb',
'erlang',
'erlang-repl',
'excel',
'fix',
'flix',
'fortran',
'fsharp',
'gams',
'gauss',
'gcode',
'gherkin',
'glsl',
'gml',
'go',
'gherkin'
].concat(hljs.listLanguages())
'golo',
'gradle',
'groovy',
'haml',
'handlebars',
'haskell',
'haxe',
'hsp',
'htmlbars',
'http',
'hy',
'inform7',
'ini',
'irpf90',
'isbl',
'java',
'javascript',
'jboss-cli',
'json',
'julia',
'julia-repl',
'kotlin',
'lasso',
'latex',
'ldif',
'leaf',
'less',
'lisp',
'livecodeserver',
'livescript',
'llvm',
'lsl',
'lua',
'makefile',
'markdown',
'mathematica',
'matlab',
'maxima',
'mel',
'mercury',
'mipsasm',
'mizar',
'mojolicious',
'monkey',
'moonscript',
'n1ql',
'nginx',
'nim',
'nix',
'node-repl',
'nsis',
'objectivec',
'ocaml',
'openscad',
'oxygene',
'parser3',
'perl',
'pf',
'pgsql',
'php',
'php-template',
'plaintext',
'pony',
'powershell',
'processing',
'profile',
'prolog',
'properties',
'protobuf',
'puppet',
'purebasic',
'python',
'python-repl',
'q',
'qml',
'reasonml',
'rib',
'r',
'roboconf',
'routeros',
'rsl',
'ruby',
'ruleslanguage',
'rust',
'sas',
'scala',
'scheme',
'scilab',
'scss',
'shell',
'smali',
'smalltalk',
'sml',
'sqf',
'sql',
'sql_more',
'stan',
'stata',
'step21',
'stylus',
'subunit',
'swift',
'taggerscript',
'tap',
'tcl',
'thrift',
'tp',
'twig',
'typescript',
'vala',
'vbnet',
'vbscript-html',
'vbscript',
'verilog',
'vhdl',
'vim',
'x86asm',
'xl',
'xml',
'xquery',
'yaml',
'zephir'
]
const supportCharts = ['sequence', 'flow', 'graphviz', 'mermaid', 'abc']
const supportHeaders = [
{

View file

@ -248,7 +248,6 @@ module.exports = {
'bootstrap-validator',
'expose-loader?exposes=jsyaml!js-yaml',
'expose-loader?exposes=moment!moment',
'expose-loader?exposes=hljs!highlight.js',
'expose-loader?exposes=emojify!emojify.js',
'expose-loader?exposes=LZString!lz-string',
'flowchart.js',
@ -279,7 +278,6 @@ module.exports = {
'babel-polyfill',
'expose-loader?exposes=jsyaml!js-yaml',
'expose-loader?exposes=moment!moment',
'expose-loader?exposes=hljs!highlight.js',
'expose-loader?exposes=emojify!emojify.js',
'flowchart.js',
'js-sequence-diagrams',
@ -312,7 +310,6 @@ module.exports = {
'bootstrap-tooltip',
'expose-loader?exposes=jsyaml!js-yaml',
'expose-loader?exposes=moment!moment',
'expose-loader?exposes=hljs!highlight.js',
'expose-loader?exposes=emojify!emojify.js',
'flowchart.js',
'js-sequence-diagrams',
@ -342,7 +339,6 @@ module.exports = {
'socket.io-client': 'io',
'jquery': '$',
'moment': 'moment',
'highlight.js': 'hljs',
'select2': 'select2'
},