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rollup.config.ts
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rollup.config.ts
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import { visualizer } from 'rollup-plugin-visualizer'
import commonjs from '@rollup/plugin-commonjs'
import { nodeResolve } from '@rollup/plugin-node-resolve'
import eslint from '@rollup/plugin-eslint'
import cleanup from 'js-cleanup'
import * as rollup from 'rollup'
import * as recast from 'recast'
import recastBabylonParser from 'recast/parsers/babylon.js'
import nodePolyfills from 'rollup-plugin-polyfill-node'
import typescript from '@rollup/plugin-typescript'
import path, { dirname } from 'path'
import { fileURLToPath } from 'url'
import pkg from './package.json' assert { type: 'json' }
const __filename = fileURLToPath(import.meta.url)
const __dirname = dirname(__filename)
const PURE_ANNO = '#__PURE__'
const EXTENSION_DIR = path.resolve(__dirname, 'extensions')
const externals = [
...Object.keys(pkg.dependencies)
]
const extensions = ['.js', '.ts']
// Ignore those polyfills by marking them as external, rollup will treeshake-out the imports for us
// We ignore them because it's imported by a code which isn't included in the final bundle
// But the polyfill doesn't export all required fields and make the build crash
const IGNORED_NODE_POLYFILLS = new Set(['os', 'fs'])
function isExternal (source: string) {
if (IGNORED_NODE_POLYFILLS.has(source)) {
return true
}
if (source.startsWith('extensions/')) {
return false
}
if (externals.some(external => source === external || source.startsWith(`${external}/`))) {
return true
}
return false
}
export default rollup.defineConfig({
cache: false,
input: {
index: 'src/index.ts'
},
treeshake: {
annotations: true,
moduleSideEffects: false
},
output: [{
chunkFileNames: '[name].js',
hoistTransitiveImports: false,
dir: 'dist',
format: 'esm',
preserveModules: true,
preserveModulesRoot: 'src'
}],
plugins: [
{
name: 'external-resolver',
resolveId (id) {
if (id === 'vscode-languageclient/browser') {
return {
id: 'vscode-languageclient/browser.js',
external: 'absolute'
}
}
if (isExternal(id)) {
return {
id,
external: true
}
}
return undefined
}
},
typescript({
noEmitOnError: true
}),
nodePolyfills(),
eslint({
throwOnError: true,
throwOnWarning: true,
include: ['**/*.ts']
}),
nodeResolve({
extensions,
browser: true
}),
{
name: 'resolve-extensions',
resolveId (id) {
if (id.startsWith('extensions/')) {
return path.resolve(__dirname, `${id}.js`)
}
return undefined
}
},
commonjs({
esmExternals: (id) => {
if (id === 'vscode') {
return true
}
if (id.match(/^vscode-languageserver-protocol(\/.*)?/) != null) {
return true
}
return false
}
}),
visualizer(),
{
name: 'dynamic-import-polyfill',
renderDynamicImport (): { left: string, right: string } {
return {
left: 'import(',
right: ').then(module => module)'
}
}
},
{
name: 'improve-extension-treeshaking',
transform (code, id) {
if (id.startsWith(EXTENSION_DIR)) {
const ast = recast.parse(code, {
parser: recastBabylonParser
})
let transformed: boolean = false
function addComment (node: recast.types.namedTypes.Expression) {
if (!(node.comments ?? []).some(comment => comment.value === PURE_ANNO)) {
transformed = true
node.comments = [recast.types.builders.commentBlock(PURE_ANNO, true)]
}
}
recast.visit(ast.program.body, {
visitNewExpression (path) {
const node = path.node
if (node.callee.type === 'Identifier') {
addComment(node)
}
this.traverse(path)
},
visitCallExpression (path) {
const node = path.node
if (node.callee.type === 'Identifier') {
addComment(node)
} else if (node.callee.type === 'FunctionExpression') {
// Mark IIFE as pure, because typescript compile enums as IIFE
addComment(node)
}
this.traverse(path)
return undefined
},
visitFunctionDeclaration () {
// Do not treeshake code inside functions, only at root
return false
},
visitThrowStatement () {
return false
}
})
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
if (transformed) {
code = recast.print(ast).code
code = code.replace(/\/\*#__PURE__\*\/\s+/g, '/*#__PURE__*/ ') // Remove space after PURE comment
return code
}
}
return undefined
}
}, {
name: 'cleanup',
renderChunk (code) {
// Remove comments, and #__PURE__ comments in enum IIFE in particular because webpack will treeshake them out
// While rollup doesn't if the parameter is used
return cleanup(code, null, {
comments: 'none',
sourcemap: false
}).code
}
}
]
})