How to remove global "use strict" added by babel

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"]}