microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/bundler/src/vite-plugin.ts
135lines · modecode
| 1 | import { resolvePath } from "@cadl-lang/compiler"; |
| 2 | import { resolve } from "path"; |
| 3 | import type { IndexHtmlTransformContext, Plugin, ResolvedConfig } from "vite"; |
| 4 | import { CadlBundle, CadlBundleDefinition, createCadlBundle, watchCadlBundle } from "./bundler.js"; |
| 5 | |
| 6 | export interface CadlBundlePluginOptions { |
| 7 | folderName: string; |
| 8 | |
| 9 | /** |
| 10 | * Name of libraries to bundle. |
| 11 | */ |
| 12 | libraries: string[]; |
| 13 | } |
| 14 | |
| 15 | export function cadlBundlePlugin(options: CadlBundlePluginOptions): Plugin { |
| 16 | let config: ResolvedConfig; |
| 17 | const definitions: Record<string, CadlBundleDefinition> = {}; |
| 18 | const bundles: Record<string, CadlBundle> = {}; |
| 19 | |
| 20 | return { |
| 21 | name: "cadl-bundle", |
| 22 | enforce: "pre", |
| 23 | async configResolved(c) { |
| 24 | config = c; |
| 25 | }, |
| 26 | async buildStart() { |
| 27 | for (const name of options.libraries) { |
| 28 | const bundle = await bundleLibrary(config.root, name); |
| 29 | bundles[name] = bundle; |
| 30 | definitions[name] = bundle.definition; |
| 31 | } |
| 32 | }, |
| 33 | async configureServer(server) { |
| 34 | for (const library of options.libraries) { |
| 35 | await watchBundleLibrary(config.root, library, (bundle) => { |
| 36 | bundles[library] = bundle; |
| 37 | definitions[library] = bundle.definition; |
| 38 | server.ws.send({ type: "full-reload" }); |
| 39 | }); |
| 40 | } |
| 41 | |
| 42 | server.middlewares.use((req, res, next) => { |
| 43 | const id = req.url; |
| 44 | if (id === undefined) { |
| 45 | next(); |
| 46 | return; |
| 47 | } |
| 48 | const start = `/${options.folderName}/`; |
| 49 | |
| 50 | const resolveFilename = (path: string) => { |
| 51 | if (path === "") { |
| 52 | return "index.js"; |
| 53 | } else { |
| 54 | return `${path}.js`; |
| 55 | } |
| 56 | }; |
| 57 | const findPkgName = (id: string): [string, string] | undefined => { |
| 58 | const segments = id.slice(start.length, -".js".length).split("/"); |
| 59 | if (bundles[segments[0]]) { |
| 60 | return [segments[0], resolveFilename(segments.slice(1).join("/"))]; |
| 61 | } |
| 62 | const inFolder = segments[0] + "/" + segments[1]; |
| 63 | if (bundles[inFolder]) { |
| 64 | return [inFolder, resolveFilename(segments.slice(2).join("/"))]; |
| 65 | } |
| 66 | return undefined; |
| 67 | }; |
| 68 | if (id.startsWith(start) && id.endsWith(".js")) { |
| 69 | const found = findPkgName(id); |
| 70 | if (found) { |
| 71 | const [pkgId, path] = found; |
| 72 | const file = bundles[pkgId].files.find((x) => x.filename === path); |
| 73 | if (file) { |
| 74 | res.writeHead(200, "Ok", { "Content-Type": "application/javascript" }); |
| 75 | res.write(file.content); |
| 76 | res.end(); |
| 77 | return; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | next(); |
| 82 | }); |
| 83 | }, |
| 84 | |
| 85 | async generateBundle() { |
| 86 | for (const name of options.libraries) { |
| 87 | for (const file of bundles[name].files) { |
| 88 | this.emitFile({ |
| 89 | type: "asset", |
| 90 | fileName: `${options.folderName}/${name}/${file.filename}`, |
| 91 | source: file.content, |
| 92 | }); |
| 93 | } |
| 94 | } |
| 95 | }, |
| 96 | |
| 97 | transformIndexHtml: { |
| 98 | enforce: "post", |
| 99 | transform: (html: string, ctx: IndexHtmlTransformContext) => { |
| 100 | // Inject the importmap before the html script. Cannot just use injectTo:head-prepend as vite will inject its own script before that and cause a failure. |
| 101 | const importMapTag = `<script type="importmap">\n${JSON.stringify( |
| 102 | createImportMap(options.folderName, definitions), |
| 103 | null, |
| 104 | 2 |
| 105 | )}\n</script>`; |
| 106 | return html.replace("<html", importMapTag + "\n<html"); |
| 107 | }, |
| 108 | }, |
| 109 | }; |
| 110 | } |
| 111 | |
| 112 | function createImportMap(folderName: string, definitions: Record<string, CadlBundleDefinition>) { |
| 113 | const imports: Record<string, string> = {}; |
| 114 | for (const [library, definition] of Object.entries(definitions)) { |
| 115 | imports[library] = `./${folderName}/${library}/index.js`; |
| 116 | for (const name of Object.keys(definition.exports)) { |
| 117 | imports[library + "/http"] = "./" + resolvePath(`./${folderName}/${library}`, name) + ".js"; |
| 118 | } |
| 119 | } |
| 120 | const importMap = { |
| 121 | imports: imports, |
| 122 | }; |
| 123 | |
| 124 | return importMap; |
| 125 | } |
| 126 | async function bundleLibrary(projectRoot: string, name: string) { |
| 127 | return await createCadlBundle(resolve(projectRoot, "node_modules", name)); |
| 128 | } |
| 129 | async function watchBundleLibrary( |
| 130 | projectRoot: string, |
| 131 | name: string, |
| 132 | onChange: (bundle: CadlBundle) => void |
| 133 | ) { |
| 134 | return await watchCadlBundle(resolve(projectRoot, "node_modules", name), onChange); |
| 135 | } |
| 136 | |