enso/app/ide-desktop/lib/content/esbuild-config.ts

/**
 * @file Configuration for the esbuild bundler and build/watch commands.
 *
 * The bundler processes each entry point into a single file, each with no external dependencies and
 * minified. This primarily involves resolving all imports, along with some other transformations
 * (like TypeScript compilation).
 *
 * See the bundlers documentation for more information:
 * https://esbuild.github.io/getting-started/#bundling-for-node.
 */

import * as childProcess from 'node:child_process'
import * as fs from 'node:fs/promises'
import * as fsSync from 'node:fs'
import * as pathModule from 'node:path'
import * as url from 'node:url'

import * as esbuild from 'esbuild'
import * as esbuildPluginNodeGlobals from '@esbuild-plugins/node-globals-polyfill'
import * as esbuildPluginNodeModules from '@esbuild-plugins/node-modules-polyfill'
import esbuildPluginAlias from 'esbuild-plugin-alias'
import esbuildPluginCopyDirectories from 'esbuild-plugin-copy-directories'
import esbuildPluginTime from 'esbuild-plugin-time'
import esbuildPluginYaml from 'esbuild-plugin-yaml'

import * as utils from '../../utils'
import BUILD_INFO from '../../build.json' assert { type: 'json' }

export const THIS_PATH = pathModule.resolve(pathModule.dirname(url.fileURLToPath(import.meta.url)))

// =============================
// === Environment variables ===
// =============================

export interface Arguments {
    /** List of files to be copied from WASM artifacts. */
    wasmArtifacts: string
    /** Directory with assets. Its contents are to be copied. */
    assetsPath: string
    /** Path where bundled files are output. */
    outputPath: string
    /** The main JS bundle to load WASM and JS wasm-pack bundles. */
    ensoglAppPath: string
    /** `true` if in development mode (live-reload), `false` if in production mode. */
    devMode: boolean
}

/**
 * Get arguments from the environment.
 */
export function argumentsFromEnv(): Arguments {
    const wasmArtifacts = utils.requireEnv('ENSO_BUILD_GUI_WASM_ARTIFACTS')
    const assetsPath = utils.requireEnv('ENSO_BUILD_GUI_ASSETS')
    const outputPath = pathModule.resolve(utils.requireEnv('ENSO_BUILD_GUI'), 'assets')
    const ensoglAppPath = utils.requireEnv('ENSO_BUILD_GUI_ENSOGL_APP')
    return { wasmArtifacts, assetsPath, outputPath, ensoglAppPath, devMode: false }
}

// ===================
// === Git process ===
// ===================

/**
 * Get output of a git command.
 * @param command - Command line following the `git` program.
 * @returns Output of the command.
 */
function git(command: string): string {
    // TODO [mwu] Eventually this should be removed, data should be provided by the build script through `BUILD_INFO`.
    //            The bundler configuration should not invoke git, it is not its responsibility.
    return childProcess.execSync(`git ${command}`, { encoding: 'utf8' }).trim()
}

// ================
// === Bundling ===
// ================

/**
 * Generate the builder options.
 */
export function bundlerOptions(args: Arguments) {
    const { outputPath, ensoglAppPath, wasmArtifacts, assetsPath, devMode } = args
    const buildOptions = {
        // Disabling naming convention because these are third-party options.
        /* eslint-disable @typescript-eslint/naming-convention */
        absWorkingDir: THIS_PATH,
        bundle: true,
        loader: {
            '.html': 'copy',
            '.css': 'copy',
            '.wasm': 'copy',
            '.svg': 'copy',
            '.png': 'copy',
            '.ttf': 'copy',
        },
        entryPoints: [
            pathModule.resolve(THIS_PATH, 'src', 'index.ts'),
            pathModule.resolve(THIS_PATH, 'src', 'index.html'),
            pathModule.resolve(THIS_PATH, 'src', 'run.js'),
            pathModule.resolve(THIS_PATH, 'src', 'style.css'),
            pathModule.resolve(THIS_PATH, 'src', 'docsStyle.css'),
            ...wasmArtifacts.split(pathModule.delimiter),
            ...fsSync
                .readdirSync(assetsPath)
                .map(fileName => pathModule.resolve(assetsPath, fileName)),
        ].map(path => ({ in: path, out: pathModule.basename(path, pathModule.extname(path)) })),
        outdir: outputPath,
        outbase: 'src',
        plugins: [
            {
                // This is a workaround that is needed
                // because esbuild panics when using `loader: { '.js': 'copy' }`.
                // See https://github.com/evanw/esbuild/issues/3041.
                // Setting `loader: 'copy'` prevents this file from being converted to ESM
                // because of the `"type": "module"` in the `package.json`.
                // This file MUST be in CommonJS format because it is loaded using `Function()`
                // in `ensogl/pack/js/src/runner/index.ts`
                name: 'pkg-js-is-cjs',
                setup: build => {
                    build.onLoad({ filter: /[/\\]pkg.js$/ }, async ({ path }) => ({
                        contents: await fs.readFile(path),
                        loader: 'copy',
                    }))
                },
            },
            esbuildPluginCopyDirectories(),
            esbuildPluginYaml.yamlPlugin({}),
            esbuildPluginNodeModules.NodeModulesPolyfillPlugin(),
            esbuildPluginNodeGlobals.NodeGlobalsPolyfillPlugin({ buffer: true, process: true }),
            esbuildPluginAlias({ ensogl_app: ensoglAppPath }),
            esbuildPluginTime(),
        ],
        define: {
            GIT_HASH: JSON.stringify(git('rev-parse HEAD')),
            GIT_STATUS: JSON.stringify(git('status --short --porcelain')),
            BUILD_INFO: JSON.stringify(BUILD_INFO),
            IS_DEV_MODE: JSON.stringify(devMode),
        },
        sourcemap: true,
        minify: true,
        metafile: true,
        format: 'esm',
        platform: 'browser',
        color: true,
        logOverride: {
            // Happens in Emscripten-generated MSDF (msdfgen_wasm.js):
            //    1 │ ...typeof module!=="undefined"){module["exports"]=Module}process["o...
            'commonjs-variable-in-esm': 'silent',
            // Happens in Emscripten-generated MSDF (msdfgen_wasm.js):
            //    1 │ ...y{table.grow(1)}catch(err){if(!err instanceof RangeError){throw ...
            'suspicious-boolean-not': 'silent',
        },
        /* eslint-enable @typescript-eslint/naming-convention */
    } satisfies esbuild.BuildOptions
    // The narrower type is required to avoid non-null assertions elsewhere.
    // The intersection with `esbuild.BuildOptions` is required to allow mutation.
    const correctlyTypedBuildOptions: esbuild.BuildOptions & typeof buildOptions = buildOptions
    return correctlyTypedBuildOptions
}

/** The basic, common settings for the bundler, based on the environment variables.
 *
 * Note that they should be further customized as per the needs of the specific workflow (e.g. watch vs. build).
 */
export function bundlerOptionsFromEnv() {
    return bundlerOptions(argumentsFromEnv())
}

/** ESBuild options for bundling (one-off build) the package.
 *
 * Relies on the environment variables to be set.
 */
export function bundleOptions() {
    return bundlerOptionsFromEnv()
}