build failed on initial setup

[lukasholzer]

The initial build is failing

Build failed!

Template execution failed: TypeError: Cannot read property 'Symbol(Symbol.iterator)' of undefined
  TypeError: Cannot read property 'Symbol(Symbol.iterator)' of undefined
  
  - template.html:15 module.exports
    [..]/[index.js!..]/[preact-cli]/lib/resources/template.html:15:27
  
  - index.js:264 
    [robert-holzer-frontend]/[html-webpack-plugin]/index.js:264:16
  
  - util.js:16 tryCatcher
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/util.js:16:23
  
  - promise.js:512 Promise._settlePromiseFromHandler
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:512:31
  
  - promise.js:569 Promise._settlePromise
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:569:18
  
  - promise.js:606 Promise._settlePromiseCtx
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/promise.js:606:10
  
  - async.js:138 Async._drainQueue
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/async.js:138:12
  
  - async.js:143 Async._drainQueues
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/async.js:143:10
  
  - async.js:17 Immediate.Async.drainQueues
    [robert-holzer-frontend]/[html-webpack-plugin]/[bluebird]/js/release/async.js:17:14
  

this outputs the first npm run start in a fresh environment of preact create

The cli version is preact-cli 1.4.1 and my npm version is 4.2.0 even with latest npm version 5.3.0 the same issue

my package.json:

{
  "name": "preact",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "eslint src && preact test",
    "start": "if-env NODE_ENV=production && npm run -s serve || npm run -s dev",
    "build": "preact build",
    "serve": "preact build && preact serve",
    "dev": "preact watch"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "eslintConfig": {
    "extends": "eslint-config-synacor"
  },
  "devDependencies": {
    "eslint": "^4.3.0",
    "eslint-config-synacor": "^1.0.1",
    "if-env": "^1.0.0",
    "preact-cli": "^1.4.1"
  }
}

[reznord]

You need at least node v6 for preact-cli. Not sure why the check.js didn't kick out of the build process

[eweilow]

Getting the exact same issue and stacktrace as @lukasholzer with preact-cli 1.4.1

I did a fresh install (npm i preact-cli -g) and ran preact create projectname --sass.

node -v
v8.1.3

npm -v
5.3.0

Additionally, running either npm run -s serve or npm run -s dev results in the same error.

[lukasholzer]

I used node version 7.x and 8.x (every is greater than v6 @reznord …

[nephix]

Same issue for me with preact-cli 1.4.1 and

node v6.11.1
npm v5.3.0

[mastilver]

html-webpack-plugin's maintainer here, it's an issue on our side: jantimon/html-webpack-plugin#753, please use html-webpack-plugin@2.29.0 in the meantime

[reznord]

So, probably rolling out to last version of html-webpack-plugin should work.

[eweilow]

Can confirm that installing the previous version of html-webpack-plugin by npm i html-webpack-plugin@2.29.0 inside a project created by preact-cli resolves the issue on my end.

[mastilver]

html-webpack-plugin@2.30.1 has been released

I'm not really sure how preact-cli is working, but I've done that to fix my build:

• $ npm i -g preact-cli
• $ rm -rf node_modules
• $ rm package-lock.json
• $ npm i

[reznord]

Fixes by updating html-webpack-plugin to 2.30.1.