Babel 配置“严格模式”

Question

For some strange reason I can't for the life of me compile "vendor" libraries with my build process.

Im getting this error: SyntaxError: <FILENAME> 'with' in strict mode .

(where <FILENAME> is an actual existing filename)

The line that's failing is > 130928 | with (locals || {}) { (function(){ > 130928 | with (locals || {}) { (function(){ and its complaining about that with . Bear in mind that this file is outside my control.

My .babelrc file has this config.

{
    "compact": true,
    "plugins": [
        "transform-runtime",
        "undeclared-variables-check"
    ],
    "presets": [
        "es2015",
        "stage-0"
    ]
}

I'm using babel 6, I know the general conscious is to use version 5, but no luck there either.

Answer 1

Not sure why this hasn't been answered already.

The es2015 preset (and, to my understanding, every babel preset) enables strict mode. Check out MDN's article on strict mode , specifically the section with header "Simplifying variable uses". with is illegal in strict mode.