chore: move build utilities to Compiler class

packages/core/framework/package.json

@@ -27,6 +27,7 @@
     "./feature-flags": "./dist/feature-flags/index.js",
     "./utils": "./dist/utils/index.js",
     "./types": "./dist/types/index.js",
+    "./build-tools": "./dist/build-tools/index.js",
     "./orchestration": "./dist/orchestration/index.js",
     "./workflows-sdk": "./dist/workflows-sdk/index.js",
     "./workflows-sdk/composer": "./dist/workflows-sdk/composer.js",

packages/core/framework/src/build-tools/compiler.ts

@@ -0,0 +1,366 @@
+import path from "path"
+import type tsStatic from "typescript"
+import { getConfigFile } from "@medusajs/utils"
+import type { ConfigModule, Logger } from "@medusajs/types"
+import { access, constants, copyFile, rm } from "fs/promises"
+
+/**
+ * The compiler exposes the opinionated APIs for compiling Medusa
+ * applications and plugins. You can perform the following
+ * actions.
+ *
+ * - loadTSConfigFile: Load and parse the TypeScript config file. All errors
+ *   will be reported using the logger.
+ *
+ * - buildAppBackend: Compile the Medusa application backend source code to the
+ *   ".medusa/server" directory. The admin source and integration-tests are
+ *   skipped.
+ *
+ * - buildAppFrontend: Compile the admin extensions using the "@medusjs/admin-bundler"
+ *   package. Admin can be compiled for self hosting (aka adminOnly), or can be compiled
+ *   to be bundled with the backend output.
+ */
+export class Compiler {
+  #logger: Logger
+  #projectRoot: string
+  #appDistFolder: string
+  #adminSourceFolder: string
+  #adminOnlyDistFolder: string
+  #adminBundledDistFolder: string
+  #tsCompiler?: typeof tsStatic
+
+  constructor(projectRoot: string, logger: Logger) {
+    this.#projectRoot = projectRoot
+    this.#logger = logger
+    this.#appDistFolder = path.join(this.#projectRoot, ".medusa/server")
+    this.#adminSourceFolder = path.join(this.#projectRoot, "src/admin")
+    this.#adminOnlyDistFolder = path.join(this.#projectRoot, ".medusa/admin")
+    this.#adminBundledDistFolder = path.join(
+      this.#projectRoot,
+      ".medusa/server/public/admin"
+    )
+  }
+
+  /**
+   * Util to track duration using hrtime
+   */
+  #trackDuration() {
+    const startTime = process.hrtime()
+    return {
+      getSeconds() {
+        const duration = process.hrtime(startTime)
+        return (duration[0] + duration[1] / 1e9).toFixed(2)
+      },
+    }
+  }
+
+  /**
+   * Imports and stores a reference to the TypeScript compiler.
+   * We dynamically import "typescript", since its is a dev
+   * only dependency
+   */
+  async #loadTSCompiler() {
+    if (!this.#tsCompiler) {
+      this.#tsCompiler = await import("typescript")
+    }
+    return this.#tsCompiler
+  }
+
+  /**
+   * Copies the file to the destination without throwing any
+   * errors if the source file is missing
+   */
+  async #copy(source: string, destination: string) {
+    let sourceExists = false
+    try {
+      await access(source, constants.F_OK)
+      sourceExists = true
+    } catch (error) {
+      if (error.code !== "ENOENT") {
+        throw error
+      }
+    }
+
+    if (sourceExists) {
+      await copyFile(path.join(source), path.join(destination))
+    }
+  }
+
+  /**
+   * Copies package manager files from the project root
+   * to the specified dist folder
+   */
+  async #copyPkgManagerFiles(dist: string) {
+    /**
+     * Copying package manager files
+     */
+    await this.#copy(
+      path.join(this.#projectRoot, "package.json"),
+      path.join(dist, "package.json")
+    )
+    await this.#copy(
+      path.join(this.#projectRoot, "yarn.lock"),
+      path.join(dist, "yarn.lock")
+    )
+    await this.#copy(
+      path.join(this.#projectRoot, "pnpm.lock"),
+      path.join(dist, "pnpm.lock")
+    )
+    await this.#copy(
+      path.join(this.#projectRoot, "package-lock.json"),
+      path.join(dist, "package-lock.json")
+    )
+  }
+
+  /**
+   * Removes the directory and its children recursively and
+   * ignores any errors
+   */
+  async #clean(path: string) {
+    await rm(path, { recursive: true }).catch(() => {})
+  }
+
+  /**
+   * Loads the medusa config file and prints the error to
+   * the console (in case of any errors). Otherwise, the
+   * file path and the parsed config is returned
+   */
+  async #loadMedusaConfig() {
+    const { configModule, configFilePath, error } =
+      await getConfigFile<ConfigModule>(this.#projectRoot, "medusa-config")
+    if (error) {
+      this.#logger.error(`Failed to load medusa-config.(js|ts) file`)
+      this.#logger.error(error)
+      return
+    }
+
+    return { configFilePath, configModule }
+  }
+
+  /**
+   * Given a tsconfig file, this method will write the compiled
+   * output to the specified destination
+   */
+  async #emitBuildOutput(
+    tsConfig: tsStatic.ParsedCommandLine,
+    chunksToIgnore: string[],
+    dist: string
+  ): Promise<{
+    emitResult: tsStatic.EmitResult
+    diagnostics: tsStatic.Diagnostic[]
+  }> {
+    const ts = await this.#loadTSCompiler()
+    const filesToCompile = tsConfig.fileNames.filter((fileName) => {
+      return chunksToIgnore.some((chunk) => !fileName.includes(chunk))
+    })
+
+    /**
+     * Create emit program to compile and emit output
+     */
+    const program = ts.createProgram(filesToCompile, {
+      ...tsConfig.options,
+      ...{
+        outDir: dist,
+        inlineSourceMap: !tsConfig.options.sourceMap,
+      },
+    })
+
+    const emitResult = program.emit()
+    const diagnostics = ts
+      .getPreEmitDiagnostics(program)
+      .concat(emitResult.diagnostics)
+
+    /**
+     * Log errors (if any)
+     */
+    if (diagnostics.length) {
+      console.error(
+        ts.formatDiagnosticsWithColorAndContext(
+          diagnostics,
+          ts.createCompilerHost({})
+        )
+      )
+    }
+
+    return { emitResult, diagnostics }
+  }
+
+  /**
+   * Loads and parses the TypeScript config file. In case of an error, the errors
+   * will be logged using the logger and undefined it returned
+   */
+  async loadTSConfigFile(): Promise<tsStatic.ParsedCommandLine | undefined> {
+    const ts = await this.#loadTSCompiler()
+    let tsConfigErrors: tsStatic.Diagnostic[] = []
+
+    const tsConfig = ts.getParsedCommandLineOfConfigFile(
+      path.join(this.#projectRoot, "tsconfig.json"),
+      {
+        inlineSourceMap: true,
+        excludes: [],
+      },
+      {
+        ...ts.sys,
+        useCaseSensitiveFileNames: true,
+        getCurrentDirectory: () => this.#projectRoot,
+        onUnRecoverableConfigFileDiagnostic: (error) =>
+          (tsConfigErrors = [error]),
+      }
+    )
+
+    /**
+     * Push errors from the tsConfig parsed output to the
+     * tsConfigErrors array.
+     */
+    if (tsConfig?.errors.length) {
+      tsConfigErrors.push(...tsConfig.errors)
+    }
+
+    /**
+     * Display all config errors using the diagnostics reporter
+     */
+    if (tsConfigErrors.length) {
+      const compilerHost = ts.createCompilerHost({})
+      this.#logger.error(
+        ts.formatDiagnosticsWithColorAndContext(tsConfigErrors, compilerHost)
+      )
+      return
+    }
+
+    /**
+     * If there are no errors, the `tsConfig` object will always exist.
+     */
+    return tsConfig!
+  }
+
+  /**
+   * Builds the application backend source code using
+   * TypeScript's official compiler. Also performs
+   * type-checking
+   */
+  async buildAppBackend(
+    tsConfig: tsStatic.ParsedCommandLine
+  ): Promise<boolean> {
+    const tracker = this.#trackDuration()
+    this.#logger.info("Compiling backend source...")
+
+    /**
+     * Step 1: Cleanup existing build output
+     */
+    this.#logger.info(
+      `Removing existing "${path.relative(
+        this.#projectRoot,
+        this.#appDistFolder
+      )}" folder`
+    )
+    await this.#clean(this.#appDistFolder)
+
+    /**
+     * Step 2: Compile TypeScript source code
+     */
+    const { emitResult, diagnostics } = await this.#emitBuildOutput(
+      tsConfig,
+      ["integration-tests", "test", "unit-tests", "src/admin"],
+      this.#appDistFolder
+    )
+
+    /**
+     * Exit early if no output is written to the disk
+     */
+    if (emitResult.emitSkipped) {
+      this.#logger.warn("Backend build completed without emitting any output")
+      return false
+    }
+
+    /**
+     * Step 3: Copy package manager files to the output folder
+     */
+    await this.#copyPkgManagerFiles(this.#appDistFolder)
+
+    /**
+     * Notify about the state of build
+     */
+    if (diagnostics.length) {
+      this.#logger.warn(
+        `Backend build completed with errors (${tracker.getSeconds()}s)`
+      )
+    } else {
+      this.#logger.info(
+        `Backend build completed successfully (${tracker.getSeconds()}s)`
+      )
+    }
+
+    return true
+  }
+
+  /**
+   * Builds the frontend source code of a Medusa application
+   * using the "@medusajs/admin-bundler" package.
+   */
+  async buildAppFrontend(
+    adminOnly: boolean,
+    tsConfig: tsStatic.ParsedCommandLine
+  ): Promise<boolean> {
+    const tracker = this.#trackDuration()
+
+    /**
+     * Step 1: Load the medusa config file to read
+     * admin options
+     */
+    const configFile = await this.#loadMedusaConfig()
+    if (!configFile) {
+      return false
+    }
+
+    /**
+     * Return early when admin is disabled and we are trying to
+     * create a bundled build for the admin.
+     */
+    if (configFile.configModule.admin.disable && !adminOnly) {
+      this.#logger.info(
+        "Skipping admin build, since its disabled inside the medusa-config file"
+      )
+      return false
+    }
+
+    /**
+     * Warn when we are creating an admin only build, but forgot to disable
+     * the admin inside the config file
+     */
+    if (!configFile.configModule.admin.disable && adminOnly) {
+      this.#logger.warn(
+        `You are building using the flag --admin-only but the admin is enabled in your medusa-config, If you intend to host the dashboard separately you should disable the admin in your medusa config`
+      )
+    }
+
+    try {
+      this.#logger.info("Compiling frontend source...")
+      const { build: buildProductionBuild } = await import(
+        "@medusajs/admin-bundler"
+      )
+      await buildProductionBuild({
+        disable: false,
+        sources: [this.#adminSourceFolder],
+        ...configFile.configModule.admin,
+        outDir: adminOnly
+          ? this.#adminOnlyDistFolder
+          : this.#adminBundledDistFolder,
+      })
+
+      this.#logger.info(
+        `Frontend build completed successfully (${tracker.getSeconds()}s)`
+      )
+      return true
+    } catch (error) {
+      this.#logger.error("Unable to compile frontend source")
+      console.error(error)
+      return false
+    }
+  }
+
+  /**
+   * @todo. To be implemented
+   */
+  buildPluginBackend() {}
+  developPluginBacked() {}
+}

packages/core/framework/src/build-tools/index.ts

@@ -0,0 +1 @@
+export * from "./compiler"