Javascript minification failed. Couldn't minify; stripping leading and trailing whitespace.

[Mahyar Damavand]

I got `Javascript minification failed` on an external javascript. when I followed up and removed extra lines, I found that parser fails to pars this code snippet:

```

(n) => {
    if (n==3) {
    }
}

```

this is the output:

```

user@ubuntu-apache-test:~$ pagespeed_js_minify /tmp/file.js
Error: /tmp/file.js: Couldn't minify; stripping leading and trailing whitespace.

Error: /tmp/tttt: Couldn't minify; stripping leading and trailing whitespace.

(n) => {
    if (n==3) {
    }
}

```

is there any problem with arrow functions?

[Joshua Marantz]

I wasn't aware of that limitation. Does it work if you terminate the assignment statement with a semi-colon?

(n) => {
    if (n==3) {
    }
};

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[Mahyar Damavand]

Sorry, there's no assignment here. if you have a double check, you'll see an arrow function and an if statement. no semicolon needed. 

In addition the only way I was able to fix it, was when I changed the arrow function to a traditional function.

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مهیار دماوند

Mahyar Damavand

---------------------------

[Mahyar Damavand]

I noticed your example and the semicolon you added to my code and did these checks:

```

user@ubuntu-apache-test:~$ pagespeed_js_minify /tmp/file.js
Error: /tmp/file.js: Couldn't minify; stripping leading and trailing whitespace.

(n) => {
    if (n==3) {
    }
};

user@ubuntu-apache-test:~$ pagespeed_js_minify /tmp/file.js

Error: /tmp/file.js: Couldn't minify; stripping leading and trailing whitespace.

let mf = (n) => {
    if (n==3) {
    }
};

```