大家好，現在距離截稿只剩 45 分鐘，由於時間關係，今天看來也要水一下（筆者：三十天中水了五天真的好嗎 @.@）。
昨天我們試用了一下 purescript-halogen-template。如果有留意 terminal 的話會發現一些 compiler warnings:
Warning 1 of 19:
in module Control.MonadZero
at .spago/control/v5.0.0/src/Control/MonadZero.purs:48:1 - 48:43 (line 48, column 1 - line 48, column 43)
A custom warning occurred while solving type class constraints:
'MonadZero' is deprecated, use 'Monad' and 'Alternative' constraints instead
in value declaration monadZeroArray
See https://github.com/purescript/documentation/blob/master/errors/UserDefinedWarning.md for more information,
or to contribute content related to this warning.
# 下略
這是因為 purescript-halogen-template 的 purescript 版本太舊了。考慮到今天的時間限制，我們可以來更新一下這個。首先打開 packages.dhall，按照以下的 diff 修改：
@@ -1,4 +1,4 @@
let upstream =
- https://github.com/purescript/package-sets/releases/download/psc-0.14.4-20211005/packages.dhall sha256:2ec351f17be14b3f6421fbba36f4f01d1681e5c7f46e0c981465c4cf222de5be
+ https://github.com/purescript/package-sets/releases/download/psc-0.15.4-20220901/packages.dhall sha256:f1531b29c21ac437ffe5666c1b6cc76f0a9c29d3c9d107ff047aa2567744994f
in upstream
修改 spago.dhall:
@@ -1,5 +1,5 @@
{ name = "halogen-project"
-, dependencies = [ "console", "effect", "halogen", "psci-support" ]
+, dependencies = [ "console", "effect", "halogen", "prelude" ]
, packages = ./packages.dhall
, sources = [ "src/**/*.purs", "test/**/*.purs" ]
}
到這裡可以先跑 spago build。
接下來修改 package.json:
@@ -1,9 +1,9 @@
{
"private": true,
"devDependencies": {
- "parcel": "1.12.3",
- "purescript": "^0.14.0",
- "spago": "^0.19.1"
+ "parcel": "2.7.0",
+ "purescript": "^0.15.4",
+ "spago": "^0.20.9"
},
"scripts": {
"build": "spago build",
注意我們順道把 parcel 改成 v2，這樣應該會 build 更快。接下來跑一下 yarn。
都好了以後我們照舊跑 yarn run build --watch 跟 yarn run serve：
> yarn run serve
yarn run v1.22.15
$ parcel dev/index.html --open
Server running at http://localhost:1234
? Build failed.
@parcel/transformer-js: Browser scripts cannot have imports or exports.
/Users/limouren/halogen-project/dev/index.js:1:1
> 1 | require("../output/Main/index.js").main();
> | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
2 |
/Users/limouren/halogen-project/dev/index.html:8:5
7 | <body>
> 8 | <script src="./index.js"></script>
> | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The environment was originally created here
9 | </body>
10 | </html>
? Add the type="module" attribute to the <script> tag.
? Learn more: https://parceljs.org/languages/javascript/#classic-scripts
yarn run serve 失敗了，因為 parcel v2 改用了 ES Module。按照指示修改 dev/index.html:
@@ -5,6 +5,6 @@
<title>Halogen6 Template</title>
</head>
<body>
- <script src="./index.js"></script>
+ <script src="./index.js" type="module"></script>
</body>
</html>
可以看到 parcel rebuild 成功：
Server running at http://localhost:1234
✨ Built in 485ms
到這裡去 http://localhost:1234 看看東西是不是都能動。這樣東西都能動也沒有 warnings，內心舒服多了！
Reference:
iThome鐵人賽
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