feat: ES module support

.changeset/quick-rocks-cover.md

@@ -0,0 +1,5 @@
+---
+"app-builder-lib": minor
+---
+
+feat: Enable ESM support for hooks by using dynamic `import()` when `package.json` is set to type `module`.

packages/app-builder-lib/src/appInfo.ts

@@ -22,6 +22,7 @@ export function smarten(s: string): string {
 export class AppInfo {
   readonly description = smarten(this.info.metadata.description || "")
   readonly version: string
+  readonly type: string | undefined
   readonly shortVersion: string | undefined
   readonly shortVersionWindows: string | undefined
 
@@ -39,6 +40,7 @@ export class AppInfo {
     normalizeNfd = false
   ) {
     this.version = info.metadata.version!
+    this.type = info.metadata.type
 
     if (buildVersion == null) {
       buildVersion = info.config.buildVersion

packages/app-builder-lib/src/codeSign/windowsCodeSign.ts

@@ -52,7 +52,7 @@ export async function sign(options: WindowsSignOptions, packager: WinPackager):
     hashes = Array.isArray(hashes) ? hashes : [hashes]
   }
 
-  const executor = resolveFunction(options.options.sign, "sign") || doSign
+  const executor = (await resolveFunction(packager.appInfo.type, options.options.sign, "sign")) || doSign
   let isNest = false
   for (const hash of hashes) {
     const taskConfiguration: WindowsSignTaskConfiguration = { ...options, hash, isNest }

packages/app-builder-lib/src/index.ts

@@ -76,7 +76,7 @@ export function build(options: PackagerOptions & PublishOptions, packager: Packa
   process.once("SIGINT", sigIntHandler)
 
   const promise = packager.build().then(async buildResult => {
-    const afterAllArtifactBuild = resolveFunction(buildResult.configuration.afterAllArtifactBuild, "afterAllArtifactBuild")
+    const afterAllArtifactBuild = await resolveFunction(packager.appInfo.type, buildResult.configuration.afterAllArtifactBuild, "afterAllArtifactBuild")
     if (afterAllArtifactBuild != null) {
       const newArtifacts = asArray(await Promise.resolve(afterAllArtifactBuild(buildResult)))
       if (newArtifacts.length === 0 || !publishManager.isPublish) {

packages/app-builder-lib/src/options/metadata.ts

@@ -41,6 +41,8 @@ export interface Metadata {
   /** @private */
   readonly version?: string
   /** @private */
+  readonly type?: string
+  /** @private */
   readonly shortVersion?: string | null
   /** @private */
   readonly shortVersionWindows?: string | null

packages/app-builder-lib/src/packager.ts

@@ -257,7 +257,7 @@ export class Packager {
       },
       "building"
     )
-    const handler = resolveFunction(this.config.artifactBuildStarted, "artifactBuildStarted")
+    const handler = await resolveFunction(this.appInfo.type, this.config.artifactBuildStarted, "artifactBuildStarted")
     if (handler != null) {
       await Promise.resolve(handler(event))
     }
@@ -271,7 +271,7 @@ export class Packager {
   }
 
   async callArtifactBuildCompleted(event: ArtifactCreated): Promise<void> {
-    const handler = resolveFunction(this.config.artifactBuildCompleted, "artifactBuildCompleted")
+    const handler = await resolveFunction(this.appInfo.type, this.config.artifactBuildCompleted, "artifactBuildCompleted")
     if (handler != null) {
       await Promise.resolve(handler(event))
     }
@@ -280,14 +280,14 @@ export class Packager {
   }
 
   async callAppxManifestCreated(path: string): Promise<void> {
-    const handler = resolveFunction(this.config.appxManifestCreated, "appxManifestCreated")
+    const handler = await resolveFunction(this.appInfo.type, this.config.appxManifestCreated, "appxManifestCreated")
     if (handler != null) {
       await Promise.resolve(handler(path))
     }
   }
 
   async callMsiProjectCreated(path: string): Promise<void> {
-    const handler = resolveFunction(this.config.msiProjectCreated, "msiProjectCreated")
+    const handler = await resolveFunction(this.appInfo.type, this.config.msiProjectCreated, "msiProjectCreated")
     if (handler != null) {
       await Promise.resolve(handler(path))
     }
@@ -503,7 +503,7 @@ export class Packager {
       return
     }
 
-    const beforeBuild = resolveFunction(config.beforeBuild, "beforeBuild")
+    const beforeBuild = await resolveFunction(this.appInfo.type, config.beforeBuild, "beforeBuild")
     if (beforeBuild != null) {
       const performDependenciesInstallOrRebuild = await beforeBuild({
         appDir: this.appDir,
@@ -532,7 +532,7 @@ export class Packager {
   }
 
   async afterPack(context: AfterPackContext): Promise<any> {
-    const afterPack = resolveFunction(this.config.afterPack, "afterPack")
+    const afterPack = await resolveFunction(this.appInfo.type, this.config.afterPack, "afterPack")
     const handlers = this.afterPackHandlers.slice()
     if (afterPack != null) {
       // user handler should be last

packages/app-builder-lib/src/platformPackager.ts

@@ -204,7 +204,7 @@ export abstract class PlatformPackager<DC extends PlatformSpecificBuildOptions>
     // Due to node-gyp rewriting GYP_MSVS_VERSION when reused across the same session, we must reset the env var: https://github.com/electron-userland/electron-builder/issues/7256
     delete process.env.GYP_MSVS_VERSION
 
-    const beforePack = resolveFunction(this.config.beforePack, "beforePack")
+    const beforePack = await resolveFunction(this.appInfo.type, this.config.beforePack, "beforePack")
     if (beforePack != null) {
       await beforePack({
         appOutDir,
@@ -330,7 +330,7 @@ export abstract class PlatformPackager<DC extends PlatformSpecificBuildOptions>
       electronPlatformName: platformName,
     }
     const didSign = await this.signApp(packContext, isAsar)
-    const afterSign = resolveFunction(this.config.afterSign, "afterSign")
+    const afterSign = await resolveFunction(this.appInfo.type, this.config.afterSign, "afterSign")
     if (afterSign != null) {
       if (didSign) {
         await Promise.resolve(afterSign(packContext))
@@ -753,7 +753,16 @@ export function normalizeExt(ext: string) {
   return ext.startsWith(".") ? ext.substring(1) : ext
 }
 
-export function resolveFunction<T>(executor: T | string, name: string): T {
+async function resolveModule<T>(type: string | undefined, name: string): Promise<T> {
+  const extension = path.extname(name).toLowerCase()
+  const isModuleType = type === "module"
+  if (extension === ".mjs" || (extension === ".js" && isModuleType)) {
+    return await eval("import('" + name + "')")
+  }
+  return require(name)
+}
+
+export async function resolveFunction<T>(type: string | undefined, executor: T | string, name: string): Promise<T> {
   if (executor == null || typeof executor !== "string") {
     return executor
   }
@@ -770,8 +779,7 @@ export function resolveFunction<T>(executor: T | string, name: string): T {
     p = path.resolve(p)
   }
 
-  // eslint-disable-next-line @typescript-eslint/no-var-requires
-  const m = require(p)
+  const m: any = await resolveModule(type, p)
   const namedExport = m[name]
   if (namedExport == null) {
     return m.default || m

packages/app-builder-lib/src/util/NodeModuleCopyHelper.ts

@@ -41,7 +41,7 @@ export class NodeModuleCopyHelper extends FileCopyHelper {
     const filter = this.filter
     const metadata = this.metadata
 
-    const onNodeModuleFile = resolveFunction(this.packager.config.onNodeModuleFile, "onNodeModuleFile")
+    const onNodeModuleFile = await resolveFunction(this.packager.appInfo.type, this.packager.config.onNodeModuleFile, "onNodeModuleFile")
 
     const result: Array<string> = []
     const queue: Array<string> = []