Requiring library with multiline strings adds tabs

In my project I am requiring in a library from node_modules which contains a block of code similar to the following:

var someVariable = 'line1\
line2\
line3\
line4';

This is a valid, though not recommended, way to use multiline strings in Javascript. The issue occurs after I bundle my project with WebPack. The output looks something like this:

.. function(module,exports,__webpack_require__){ /* other code */ var someVariable='line1   line2   line3   line4'; ...

Tabs are added into the multiline string. I get the same result even when I don’t minify/uglify the output. The block of code is indented in the output and the multiline string now has the same tabs prepended to each line:

    var someVariable = 'line1\
    line2\
    line3\
    line4';

Is there something I’m doing wrong that multiline strings get their values changed, or is this a bug in WebPack?

[donaldpipowitch]

Could output.sourcePrefix default to ''? I was bitten by this recently. Tabs seem to be to dangerous for ES6 multiline strings.

[webpack-bot]

Issue was closed because of inactivity.

If you think this is still a valid issue, please file a new issue with additional information.