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using es6 template string break the html file build #950

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tommytroylin opened this issue May 14, 2018 · 8 comments · Fixed by #953
Closed

using es6 template string break the html file build #950

tommytroylin opened this issue May 14, 2018 · 8 comments · Fixed by #953

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@tommytroylin
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Description

This may be something related when html-webpack-html processing html template with lodash/template.

https://github.com/jantimon/html-webpack-plugin/blob/master/lib/loader.js#L30-L34

Error Message & Stack Trace

ERROR in Template execution failed: ReferenceError: hello is not defined

ERROR in   ReferenceError: hello is not defined

  - loader.js:6 eval
    [index.html?.]/[html-webpack-plugin]/lib/loader.js:6:10

  - loader.js:11 module.exports
    [index.html?.]/[html-webpack-plugin]/lib/loader.js:11:3

  - index.js:284 Promise.resolve.then
    [template-react-typescript]/[html-webpack-plugin]/index.js:284:18


  - next_tick.js:188 process._tickCallback
    internal/process/next_tick.js:188:7

Config

Copy the relevant section from webpack.config.js:

module.exports = {
  plugins: [
    new HtmlWebpackPlugin({
      template: "./src/index.html"
    }),
  ]
}

Copy your template file:

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>
        <%= htmlWebpackPlugin.options.title %>
    </title>
    <script>
        const hello = 'hello';
        const world = 'world'
        console.log(`${hello} ${world}`);  // ~this line~
    </script>
</head>

<body>
    <div id="app"></div>
    
</body>

</html>

Environment

node 8.11.1
macOS 10.13
npm 6
webpack 4.7
html-webpack-plugin 3.2.0
@jantimon
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Thanks for reporting this issue - could you please add a console.log statement here and post the content of source?

https://github.com/jantimon/html-webpack-plugin/blob/master/index.js#L245

@tommytroylin
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Child html-webpack-plugin for "index.html":
     1 asset
    Entrypoint undefined = index.html
    [0] (webpack)/buildin/module.js 546 bytes {0} [built]
    [1] (webpack)/buildin/global.js 492 bytes {0} [built]
    [3] ./node_modules/html-webpack-plugin/lib/loader.js!./src/index.html 674 bytes {0} [built]

it's a pretty long output and I guess what you need is module[3].
BTW, I've already run npm update so webpack should be 4.8.3 now.

The output is

(function(module, exports, __webpack_require__) {

var _ = __webpack_require__(2);module.exports = function (templateParams) { with(templateParams) {return (function(data) {
var __t, __p = '';
__p += '<!DOCTYPE html>\n<html lang="en">\n\n<head>\n    <meta charset="UTF-8">\n    <title>\n        ' +
((__t = ( htmlWebpackPlugin.options.title )) == null ? '' : __t) +
'\n    </title>\n    <script>\n        const hello = \'hello\';\n        const world = \'world\'\n        console.log(`' +
((__t = (hello)) == null ? '' : __t) +
' ' +
((__t = (world)) == null ? '' : __t) +
'`);  // ~this line~\n    </script>\n</head>\n\n<body>\n    <div id="app"></div>\n    \n</body>\n\n</html>\n';
return __p
})();}}

})

em... seems it unexpectedly processes ES6 template strings as same as <%= %> bindings.

@jantimon
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Nice 👍 thanks for analyzing.
This is exactly the reason why it is broken.
The transformation is done here:

html-webpack-plugin/lib/loader.js

Line 28 in b4312f9

const template = _.template(source, _.defaults(options, { variable: 'data' }));

Do you have any idea what might be the reason?

tommytroylin added a commit to tommytroylin/html-webpack-plugin that referenced this issue May 17, 2018
@tommytroylin
feat: support ES6 template string in default loader
591a2df 
Only transpile EJS style `<%= name %>`, Close jantimon#950
@tommytroylin tommytroylin mentioned this issue May 17, 2018
Closed
@tommytroylin
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I've find a lodash issue here lodash/lodash#399 (comment)
So this behavior is definitely caused by lodash/template which keeps ES6 template delimiters working on default.

solution could be simply add a default { interpolate: /<%=([\s\S]+?)%>/g } option to:

html-webpack-plugin/lib/loader.js

Line 28 in b4312f9

const template = _.template(source, _.defaults(options, { variable: 'data' }));

@tommytroylin
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BTW, Although in all docs it doesn't encourage users to use ${} syntax, this change may break some users' templates & projects potentially.

I suggest a semver-minor change and document it on top of changelog and readme

@jantimon
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Hey @tommytroylin
thank you so much for the fix - I will merge it very soon!
As it sounds like a breaking change I would prefer to merge it into the next major version.
I hope that's okay for you

jantimon pushed a commit that referenced this issue May 18, 2018
@tommytroylin @jantimon
feat: support ES6 template string in default loader
e570fb4 
Only transpile EJS style `<%= name %>`, Close #950
@jantimon
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Merged into https://github.com/jantimon/html-webpack-plugin/tree/webpack-4

jantimon pushed a commit that referenced this issue May 18, 2018
@tommytroylin @jantimon
feat: support ES6 template string in default loader
b6df42c 
Only transpile EJS style `<%= name %>`, Close #950

BREAKING CHANGE: Template strings inside templates are now disabled by default
jantimon pushed a commit that referenced this issue May 19, 2018
@tommytroylin @jantimon
feat: support ES6 template string in default loader
3a48171 
Only transpile EJS style `<%= name %>`, Close #950

BREAKING CHANGE: Template strings inside templates are now disabled by default
@jantimon jantimon mentioned this issue May 21, 2018
Merged
jantimon pushed a commit that referenced this issue Jun 3, 2018
@tommytroylin @jantimon
feat: support ES6 template string in default loader
d6b65dd 
Only transpile EJS style `<%= name %>`, Close #950

BREAKING CHANGE: Template strings inside templates are now disabled by default
@lock
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lock bot commented Jun 17, 2018

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

@lock lock bot locked as resolved and limited conversation to collaborators Jun 17, 2018
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html-webpack-plugin 4.x - Switching to Webpack 4 api jantimon/html-webpack-plugin
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@tommytroylin @jantimon