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index.js
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index.js
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const path = require('path');
const webpack = require('webpack');
const AddWorkerEntryPointPlugin = require('./plugins/AddWorkerEntryPointPlugin');
const INCLUDE_LOADER_PATH = require.resolve('./loaders/include');
const IGNORED_IMPORTS = {
[resolveMonacoPath('vs/language/typescript/lib/typescriptServices')]: [
'fs',
'path',
'os',
'crypto',
'source-map-support',
],
};
const MONACO_EDITOR_API_PATHS = [
resolveMonacoPath('vs/editor/editor.main'),
resolveMonacoPath('vs/editor/editor.api')
];
const WORKER_LOADER_PATH = resolveMonacoPath('vs/editor/common/services/editorSimpleWorker');
const EDITOR_MODULE = {
label: 'editorWorkerService',
entry: undefined,
worker: {
id: 'vs/editor/editor',
entry: 'vs/editor/editor.worker',
output: 'editor.worker.js',
fallback: undefined
},
alias: undefined,
};
const LANGUAGES = require('./languages');
const FEATURES = require('./features');
function resolveMonacoPath(filePath) {
return require.resolve(path.join('monaco-editor/esm', filePath));
}
const languagesById = fromPairs(
flatMap(toPairs(LANGUAGES), ([id, language]) =>
[id, ...(language.alias || [])].map((label) => [label, { label, ...language }])
)
);
const featuresById = mapValues(FEATURES, (feature, key) => ({ label: key, ...feature }))
class MonacoWebpackPlugin {
constructor(options = {}) {
const languages = options.languages || Object.keys(languagesById);
const features = options.features || Object.keys(featuresById);
const output = options.output || '';
this.options = {
languages: languages.map((id) => languagesById[id]).filter(Boolean),
features: features.map(id => featuresById[id]).filter(Boolean),
output,
};
}
apply(compiler) {
const { languages, features, output } = this.options;
const publicPath = getPublicPath(compiler);
const modules = [EDITOR_MODULE, ...languages, ...features];
const workers = modules.map(
({ label, alias, worker }) => worker && ({ label, alias, ...worker })
).filter(Boolean);
const rules = createLoaderRules(languages, features, workers, output, publicPath);
const plugins = createPlugins(workers, output);
addCompilerRules(compiler, rules);
addCompilerPlugins(compiler, plugins);
}
}
function addCompilerRules(compiler, rules) {
const compilerOptions = compiler.options;
const moduleOptions = compilerOptions.module || (compilerOptions.module = {});
const existingRules = moduleOptions.rules || (moduleOptions.rules = []);
existingRules.push(...rules);
}
function addCompilerPlugins(compiler, plugins) {
plugins.forEach((plugin) => plugin.apply(compiler));
}
function getPublicPath(compiler) {
return compiler.options.output && compiler.options.output.publicPath || '';
}
function createLoaderRules(languages, features, workers, outputPath, publicPath) {
if (!languages.length && !features.length) { return []; }
const languagePaths = languages.map(({ entry }) => entry).filter(Boolean);
const featurePaths = features.map(({ entry }) => entry).filter(Boolean);
const workerPaths = fromPairs(workers.map(({ label, output }) => [label, path.join(outputPath, output)]));
const globals = {
'MonacoEnvironment': `(function (paths) {
function stripTrailingSlash(str) {
return str.replace(/\\/$/, '');
}
return {
getWorkerUrl: function (moduleId, label) {
const pathPrefix = (typeof window.__webpack_public_path__ === 'string' ? window.__webpack_public_path__ : ${JSON.stringify(publicPath)});
return (pathPrefix ? stripTrailingSlash(pathPrefix) + '/' : '') + paths[label];
}
};
})(${JSON.stringify(workerPaths, null, 2)})`,
};
return [
{
test: MONACO_EDITOR_API_PATHS,
use: [
{
loader: INCLUDE_LOADER_PATH,
options: {
globals,
pre: featurePaths.map((importPath) => resolveMonacoPath(importPath)),
post: languagePaths.map((importPath) => resolveMonacoPath(importPath)),
},
},
],
},
];
}
function createPlugins(workers, outputPath) {
const workerFallbacks = workers.reduce((acc, { id, fallback }) => (fallback ? Object.assign(acc, {
[id]: resolveMonacoPath(fallback)
}) : acc), {});
return [
...Object.keys(IGNORED_IMPORTS).map((id) =>
createIgnoreImportsPlugin(id, IGNORED_IMPORTS[id])
),
...uniqBy(workers, ({ id }) => id).map(({ id, entry, output }) =>
new AddWorkerEntryPointPlugin({
id,
entry: resolveMonacoPath(entry),
filename: path.join(outputPath, output),
plugins: [
createContextPlugin(WORKER_LOADER_PATH, {}),
new webpack.optimize.LimitChunkCountPlugin({ maxChunks: 1 }),
],
})
),
...(workerFallbacks ? [createContextPlugin(WORKER_LOADER_PATH, workerFallbacks)] : []),
];
}
function createContextPlugin(filePath, contextPaths) {
return new webpack.ContextReplacementPlugin(
new RegExp(`^${path.dirname(filePath)}$`),
'',
contextPaths
);
}
function createIgnoreImportsPlugin(targetPath, ignoredModules) {
return new webpack.IgnorePlugin(
new RegExp(`^(${ignoredModules.map((id) => `(${id})`).join('|')})$`),
new RegExp(`^${path.dirname(targetPath)}$`)
);
}
function flatMap(items, iteratee) {
return items.map(iteratee).reduce((acc, item) => [...acc, ...item], []);
}
function toPairs(object) {
return Object.keys(object).map((key) => [key, object[key]]);
}
function fromPairs(values) {
return values.reduce((acc, [key, value]) => Object.assign(acc, { [key]: value }), {});
}
function mapValues(object, iteratee) {
return Object.keys(object).reduce(
(acc, key) => Object.assign(acc, { [key]: iteratee(object[key], key) }),
{}
);
}
function uniqBy(items, iteratee) {
const keys = {};
return items.reduce((acc, item) => {
const key = iteratee(item);
if (key in keys) { return acc; }
keys[key] = true;
acc.push(item);
return acc;
}, []);
}
module.exports = MonacoWebpackPlugin;