fix: disable inline optimization by default

[alexander-akait]

fixes #307 fixes #264

Also we have problem with using option as object, they rewrited after first run.
Also improve readme
A lot of new tests

[alexander-akait]

Typo in option name

[kzc]

this won't handle compress: false

[kzc]

nor will it handle compress: true

[kzc]

this won't handle mangle: false

[kzc]

nor will it handle mangle: true

[kzc]

inline: 1 has no reported issues in uglify-es@3.3.9.

$ echo '!function(){ console.log(42); }();' | bin/uglifyjs -c inline=false
!function(){console.log(42)}();

$ echo '!function(){ console.log(42); }();' | bin/uglifyjs -c inline=1
console.log(42);

[kzc]

If this plugin is upgraded to use terser in the future (PR #296), then the inline override can be reverted.

[alexander-akait]

@kzc we can not merge use terser as patch/minor release, it is require major release.
How we can solve this:

1. Disable inline for 1 version (patch release).
2. Allow people using own cache keys feature: add support for additional cache keys option #304 (need implement function support) (minor release).
3. Implement feature using own minify function (minor release).
4. Documented how plugin can setup using uglify-js and terser (patch release).
5. Switch on terser for next major version (major release).

[kzc]

we can not merge use terser as patch/minor release, it is require major release

I disagree. terser is a drop in replacement for uglify-es. It's a minor change.

Disabling inline in uglify-es only addresses a couple of bugs. And it could introduce other bugs in this uglify wrapper plugin as per my PR review comments above.

[alexander-akait]

@kzc other developers disagree with

I disagree. terser is a drop in replacement for uglify-es. It's a minor change.

All I'm trying to do is find the best solution for everyone and I'm tired of being between these disputes. You suggest using minor release (only relying on your words) it's too dangerous and better use major release, it is allow people safely upgrade uglify plugin (If the update introduces new bugs they can roll back without fixing the version in package.json).

[kzc]

I've been involved with the development of both uglify-es and terser since their inception. Terser is just a minor fork of uglify-es with a name change with dozens of bug fixes. But if you're more comfortable with a major for that, so be it. webpack@4 users would have to explicitly load the new major plugin to get the bug fixes.

[alexander-akait]

@kzc After release major version with terser we wait some times to ensure all work as expected, when bump this in webpack@4

[shellscape]

LGTM