I'm using function form of "use strict" and don't want global form which Babel adds after transpilation. The problem is I'm using some libraries that aren't using "use strict" mode and it might throw error after scripts are concatenated
As it has already been mentioned for Babel 6, it's the transform-es2015-modules-commonjs preset which adds strict mode.
In case you want to use the whole es2015 preset without module transformations, put this in your .babelrc file:
{
"presets": [
["es2015", { "modules": false }]
]
}
This will disable modules and strict mode, while keeping all other es2015 transformations enabled.
Babel 5
You'd blacklist "useStrict". For instance here's an example in a Gruntfile:
babel: {
options: {
blacklist: ["useStrict"],
// ...
},
// ...
}
Babel 6
Since Babel 6 is fully opt-in for plugins now, instead of blacklisting useStrict, you just don't include the strict-mode plugin. If you're using a preset that includes it, I think you'll have to create your own that includes all the others, but not that one.
There's now a babel plugin that you can add to your config that will remove strict mode: babel-plugin-transform-remove-strict-mode. It's a little ugly in that the "use strict" gets added and then removed, but it makes the config much nicer.
Docs are in the GitHub repo:
https://github.com/genify/babel-plugin-transform-remove-strict-mode
Your .babelrc ends up looking like this:
{
"presets": ["env"],
"plugins": ["transform-remove-strict-mode"]
}
I also came accross this rather ridiculous limitation that you cannot disable or overwrite settings from an existing preset, and have resorted to using this preset instead: https://www.npmjs.com/package/babel-preset-es2015-without-strict
plugins: [
[
require("#babel/plugin-transform-modules-commonjs"),
{
strictMode: false
}
],
]
You can tell babel that your code is a script with:
sourceType: "script"
in your babel config file. This will not add use strict. See sourceType option docs
Source: https://github.com/babel/babel/issues/7910#issuecomment-388517631
Babel 6 + es2015
We can disabled babel-plugin-transform-es2015-modules-commonjs to require babel-plugin-transform-strict-mode.
So comment the following code in node_modules/babel-plugin-transform-es2015-modules-commonjs/lib/index.js at 151 line
//inherits: require("babel-plugin-transform-strict-mode"),
just change .babelrc solution
if you don't want to change any npm modules, you can use .babelrc ignore like this
{
"presets": ["es2015"],
"ignore": [
"./src/js/directive/datePicker.js"
]
}
ignore that file, it works for me!
the ignored file that can't use 'use strict' is old code, and do not need to use babel to transform it!
Personally, I use the gulp-iife plugin and I wrap IIFEs around all my files. I noticed that the babel plugin (using preset es2015) adds a global "use strict" as well. I run my post babel code through the iife stream plugin again so it nullifies what babel did.
gulp.task("build-js-source-dev", function () {
return gulp.src(jsSourceGlob)
.pipe(iife())
.pipe(plumber())
.pipe(babel({ presets: ["es2015"] }))// compile ES6 to ES5
.pipe(plumber.stop())
.pipe(iife()) // because babel preset "es2015" adds a global "use strict"; which we dont want
.pipe(concat(jsDistFile)) // concat to single file
.pipe(gulp.dest("public_dist"))
});
This is not grammatically correct, but will basically work for both Babel 5 and 6 without having to install a module that removes another module.
code.replace(/^"use strict";$/, '')
Since babel 6 you can install firstly babel-cli (if you want to use Babel from the CLI ) or babel-core (to use the Node API). This package does not include modules.
npm install --global babel-cli
# or
npm install --save-dev babel-core
Then install modules that you need. So do not install module for 'strict mode' in your case.
npm install --save-dev babel-plugin-transform-es2015-arrow-functions
And add installed modules in .babelrc file like this:
{
"plugins": ["transform-es2015-arrow-functions"]
}
See details here: https://babeljs.io/blog/2015/10/31/setting-up-babel-6
For babel 6 instead of monkey patching the preset and/or forking it and publishing it, you can also just wrap the original plugin and set the strict option to false.
Something along those lines should do the trick:
const es2015preset = require('babel-preset-es2015');
const commonjsPlugin = require('babel-plugin-transform-es2015-modules-commonjs');
es2015preset.plugins.forEach(function(plugin) {
if (plugin.length && plugin[0] === commonjsPlugin) {
plugin[1].strict = false;
}
});
module.exports = es2015preset;
Please use "es2015-without-strict" instead of "es2015". Don't forget you need to have package "babel-preset-es2015-without-strict" installed. I know it's not expected default behavior of Babel, please take into account the project is not mature yet.
I just made a script that runs in the Node and removes "use strict"; in the selected file.
file: script.js:
let fs = require('fs');
let file = 'custom/path/index.js';
let data = fs.readFileSync(file, 'utf8');
let regex = new RegExp('"use\\s+strict";');
if (data.match(regex)){
let data2 = data.replace(regex, '');
fs.writeFileSync(file, data2);
console.log('use strict mode removed ...');
}
else {
console.log('use strict mode is missing .');
}
node ./script.js
if you are using https://babeljs.io/repl (v7.8.6 as of this writing), you can remove "use strict"; by selecting Source Type -> Module.
Using plugins or disabling modules and strict mode as suggested in the #rcode's answer didn't work for me.
But, changing the target from es2015|es6 to es5 in tsconfig.json file as suggested by #andrefarzart in this GitHub answer fixed the issue.
// tsconfig.json file
{
// ...
"compilerOptions": {
// ...
"target": "es5", // instead of "es2015"
}
I am using ACE editor in my browser extension. It all works fine in a Chrome/Chromium browser, but when I try the extension in Firefox (latest version), only ace.define and ace.require are available (ace.edit is needed, at least, to initialize).
Here is the part of the manifest (MV2) file involved:
"content_scripts" :
[
{
"matches": ["*://example.com/*"],
"all_frames": true,
"js": [
"ace-min/ace.js",
"myscript.js"
],
"run_at": "document_end"
},
]
What could be done wrong? Both files are being read, but only a part of ace.js seems to be executed. Imagine that myscript.js contains a console.log(ace), to see which functions can I use.
Thanks in advance!
I posted an issue on the ACE's GitHub repository. The response was very quick and polite.
All is explained in this comment: https://github.com/ajaxorg/ace/issues/4898#issuecomment-1217887526
Just a side note, use noconflict ace instead of normal ace. The function you need to change is at the bottom.
I'm using the rollup plugin strip to exclude the console.logs in the production built with following settings
plugins: [
strip({
include: ['**/*.(js|svelte)'],
labels: ['dev'],
functions: ['console.log'],
})
]
I now have the situation that I would like to keep one special log in production. So I created a function in a new file logInProduction.js
export function logInProduction(msg) {
console.log(msg)
throw new Error('PRODUCTION')
}
and added the file to the plugin options by adding this line
exclude: ['logInProduction.js'],
But when calling the function, the error is thrown, so the function was called, but the log before doesn't appear.
Is this because the .js ending is generally included before so the specific exclusion doen't have any effect? Is it possible to do this?
Or is there another maybe better way to keep one specific console.log?
Problem was, that the filename was missing the directory, so
exclude: ['src/utils/logInProduction.js'],
or
exclude: ['**/logInProduction.js'],
does work
I have the issue I would like to automate via a script so tat .jnlp will be added as an allowable type of file , is there a command like or powershell or regedit that will add it?
The latest file types policies are published in the Chromium source code. You could clearly see that the danger_level of .jnlp type files is DANGEROUS. Therefor Edge will warn users that this file may harm their computers. Let users continue or discard the file.
If you ensure that the content(download file) on the site is safe, you can use this policy to specify the file types that are allowed to be downloaded continuously from a specific site: ExemptDomainFileTypePairsFromFileTypeDownloadWarnings.
Example:
[ { "file_extension": "jnlp", "domains": ["contoso.com"] }, { "file_extension": "exe", "domains": ["contoso.com"] }, { "file_extension": "swf", "domains": ["*"] } ]
If you want to achieve the same function through the registry, you can set it under this path: SOFTWARE\Policies\Microsoft\Edge\ExemptDomainFileTypePairsFromFileTypeDownloadWarnings
I have problem to use html.erb files in vscode, I tried to format my document and i did it, but the document lose the style just like in the picture:
https://ibb.co/KLqjfcV
settings.json I have:
"files.associations": {
"*.html.erb": "html"
},
"emmet.includeLanguages": {
"html.erb": "html"
}
I appreciate any comments!
I think you need to install some package as well as set some settings up as mentioned in this post