pipeline.js dapp config to allow easy toggling of typescript

lib/pipeline/webpack.config.js

@@ -20,8 +20,9 @@ const embarkPath = process.env.EMBARK_PATH;
 
 const embarkAliases = require(path.join(dappPath, '.embark/embark-aliases.json'));
 const embarkAssets = require(path.join(dappPath, '.embark/embark-assets.json'));
-const embarkNodeModules = path.join(embarkPath, 'node_modules');
 const embarkJson = require(path.join(dappPath, 'embark.json'));
+const embarkNodeModules = path.join(embarkPath, 'node_modules');
+const embarkPipeline = require(path.join(dappPath, '.embark/embark-pipeline.json'));
 
 const buildDir = path.join(dappPath, embarkJson.buildDir);
 
@@ -192,7 +193,7 @@ const baseBabelLoader = base.module.rules[3];
 // -----------------------------------------------------------------------------
 
 // should be false in configs that have isTypeScriptEnabled = true
-const isFlowEnabled = true;
+const isFlowEnabled = !embarkPipeline.typescript;
 if (isFlowEnabled) {
   // position @babel/plugin-transform-flow-strip-types per babel-preset-react-app
   baseBabelLoader.options.plugins.unshift(
@@ -204,7 +205,7 @@ if (isFlowEnabled) {
 // -----------------------------------------------------------------------------
 
 // should be false in configs that have isFlowEnabled = true
-const isTypeScriptEnabled = false;
+const isTypeScriptEnabled = !!embarkPipeline.typescript;
 if (isTypeScriptEnabled) {
   // position @babel/preset-typescript as the last preset (runs first)
   // see: https://blogs.msdn.microsoft.com/typescript/2018/08/27/typescript-and-babel-7/

lib/pipeline/webpackProcess.js

@@ -3,7 +3,16 @@ const fs = require('../core/fs');
 const ProcessWrapper = require('../core/processes/processWrapper');
 const webpack = require('webpack');
 const writeFile = require('util').promisify(require('fs').writeFile);
-const {errorMessage} = require('../utils/utils');
+const {errorMessage, recursiveMerge} = require('../utils/utils');
+
+const defaultPipelineConfig = {
+  typescript: false
+};
+
+const pipelineConfigPath = fs.dappPath(
+  require(fs.dappPath('embark.json')).config || 'config/',
+  'pipeline.js'
+);
 
 let webpackProcess;
 
@@ -31,6 +40,18 @@ class WebpackProcess extends ProcessWrapper {
         fs.dappPath('.embark/embark-assets.json'),
         JSON.stringify(assets)
       );
+      let pipelineConfig = defaultPipelineConfig;
+      if (fs.existsSync(pipelineConfigPath)) {
+        delete require.cache[pipelineConfigPath];
+        pipelineConfig = recursiveMerge(
+          recursiveMerge(true, pipelineConfig),
+          require(pipelineConfigPath)
+        );
+      }
+      await writeFile(
+        fs.dappPath('.embark/embark-pipeline.json'),
+        JSON.stringify(pipelineConfig)
+      );
     } catch (e) {
       return callback(errorMessage(e));
     }

templates/boilerplate/config/pipeline.js

@@ -0,0 +1,3 @@
+module.exports = {
+  typescript: false
+};

templates/demo/config/pipeline.js

@@ -0,0 +1,3 @@
+module.exports = {
+  typescript: false
+};