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/**
* Bundle and transpile TypeScript to JavaScript.
* @module
*/
// Imports
import * as esbuild from "esbuild"
import { denoPlugins as plugins } from "@luca/esbuild-deno-loader"
import { encodeBase64 } from "@std/encoding/base64"
import { minify as terser } from "terser"
import { fromFileUrl } from "@std/path/from-file-url"
import { delay } from "@std/async/delay"
/**
* Bundle and transpile TypeScript to JavaScript.
*
* Minification can be either:
* - `terser` for advanced minification through {@link https://terser.org | Terser}
* - `basic` for basic minification through {@link https://github.com/evanw/esbuild | esbuild}
*
* A banner option can be provided to prepend a comment to the output, which can be useful for licensing information.
*
* Use the `shadow` option to replace the local URLs (using `file://` scheme) with a shadow url to avoid exposing real paths.
*
* @example
* ```ts
* // From file
* import { bundle } from "./bundle.ts"
* console.log(await bundle(new URL(import.meta.url)))
* ```
* @example
* ```ts
* // From string
* import { bundle } from "./bundle.ts"
* console.log(await bundle(new URL(import.meta.url), { config: new URL("deno.jsonc", import.meta.url) }))
* ```
*
* @example
* ```ts
* // From string
* import { bundle } from "./bundle.ts"
* console.log(await bundle(`console.log("Hello world")`))
* ```
*/
export async function bundle(input: URL | string, { minify = "terser", format = "esm", debug = false, banner = "", shadow = true, config, exports } = {} as options): Promise<string> {
const url = input instanceof URL ? input : new URL(`data:application/typescript;base64,${encodeBase64(input)}`)
let code = ""
try {
const { outputFiles: [{ text: output }] } = await esbuild.build({
plugins: [...plugins({ configPath: config ? fromFileUrl(config) : undefined, nodeModulesDir: true })],
entryPoints: [url.href],
format,
globalName: exports,
write: false,
minify: minify === "basic",
target: "esnext",
treeShaking: true,
sourcemap: debug ? "inline" : false,
sourcesContent: debug,
bundle: true,
logLevel: "silent",
})
code = output
if (minify) {
code = code.trim()
}
} catch (error) {
throw new TypeError(`Failed to bundle ts:\n${error.message}`)
} finally {
await esbuild.stop()
// TODO(@lowlighter): remove after https://github.com/evanw/esbuild/pull/3701
await delay(500)
}
if (minify === "terser") {
code = await terser(code, { format: { comments: false }, module: true, sourceMap: debug ? { url: "inline" } : false }).then((response) => response.code!)
}
if (banner) {
if (banner.includes("\n")) {
banner = `/**\n${banner.split("\n").map((line) => ` * ${line}`).join("\n")}\n */`
} else {
banner = `// ${banner}`
}
code = `${banner}\n${code}`
}
if (shadow) {
code = code.replaceAll(/(["'])(?<scheme>file:\/\/).*?\/(?<name>[A-Za-z0-9_]+\.(?:ts|js|mjs))\1/g, "'$<scheme>/shadow/$<name>'")
}
return code
}
/** Bundle options. */
export type options = {
minify?: false | "basic" | "terser"
format?: "esm" | "iife"
exports?: string
debug?: boolean
config?: URL
banner?: string
shadow?: boolean
}
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