✨ Artifact build support

src/commands/build.ts

@@ -71,7 +71,21 @@ const applyConfig = async (os: string, arch: string) => {
     appId: config.appId,
   })
 
-  const mergedConfig = `# This file is automatically generated. You should only modify this if you know what you are doing!\n\n${commonConfig}\n\n${osConfig}\n\n${customConfig}`
+  const internalConfig = `# Internally defined by melon\n${
+    config.buildOptions.artifactBuilds
+      ? '# Artifact builds (buildOptions.artifactBuilds) \nac_add_options --enable-artifact-builds\nmk_add_options MOZ_OBJDIR=./objdir-frontend'
+      : ''
+  }`
+
+  const mergedConfig =
+    `# This file is automatically generated. You should only modify this if you know what you are doing!\n\n` +
+    commonConfig +
+    '\n\n' +
+    osConfig +
+    '\n\n' +
+    customConfig +
+    '\n\n' +
+    internalConfig
 
   writeFileSync(resolve(ENGINE_DIR, 'mozconfig'), mergedConfig)
 

src/commands/setupProject.ts

@@ -1,6 +1,6 @@
 import { writeFileSync, existsSync, mkdirSync, readFileSync } from 'fs'
-import { readdir, stat, copyFile } from 'fs/promises'
-import { join, isAbsolute, dirname } from 'path'
+import { copyFile } from 'fs/promises'
+import { join, dirname } from 'path'
 
 import prompts from 'prompts'
 
@@ -17,7 +17,7 @@ import {
 // =============================================================================
 // User interaction portion
 
-export async function setupProject() {
+export async function setupProject(): Promise<void> {
   try {
     if (existsSync(configPath)) {
       log.warning('There is already a config file. This will overwrite it!')
@@ -118,6 +118,9 @@ export async function setupProject() {
       vendor,
       appId,
       version: { product, version, displayVersion: '1.0.0' },
+      buildOptions: {
+        artifactBuilds: ui === 'uc',
+      },
     }
 
     await copyRequired()

src/utils/config.ts

@@ -62,6 +62,21 @@ export interface Config {
      */
     displayVersion: string
   }
+  buildOptions: {
+    /**
+     * Artifact builds are faster builds that only work when modifying a limited
+     * subset of firefox's source code. They download a majority of the source
+     * code from mozilla's servers and build the ui locally. Artifact builds work
+     * with ui changes, however do not work with:
+     *  - C, C++, Rust or other machine code
+     *  - Telemetry histogram definitions
+     *  - Some build system definitions
+     *
+     * Additionally, this will not work for other mozilla products like thunderbird
+     * if we ever provide support for those platforms.
+     */
+    artifactBuilds: boolean
+  }
 }
 
 const defaultConfig: Config = {
@@ -72,6 +87,9 @@ const defaultConfig: Config = {
     product: SupportedProducts.Firefox,
     displayVersion: '1.0.0',
   },
+  buildOptions: {
+    artifactBuilds: false,
+  },
 }
 
 export function hasConfig(): boolean {