lumburr

I found in [4.17.21](https://github.com/lodash/lodash/releases/tag/4.17.21) that its dependency `Underscore.js ` contains a [cve](https://github.com/jashkenas/underscore/issues/2922). So I upgraded the version of underscore to 1.13.2. note: I don't know if it's appropriate for me...

**What**: fix: #3383 **Checklist**: - [ ] Documentation - [x] Added/updated unit tests - [x] Code complete

fix: When format the less-node, keep its context.

2

**What**: fix: #3314 **Why**: Use `% ()` to format less node is missing parameters. eg: `%("%d", hsla(90, 100%, 50%, 0.5));` will output `"hsla(89.99999999999999, 100%, 50%, 0.5)"` **How**: Add parameter `toCSSOptions`...

**What**: fix https://github.com/less/less.js/issues/3407 **Why**: If a namespace has a guard, mixins defined by it are used only if the guard condition returns true.The behavior of the variables should also be...

fix: Allows less overriding of imported css custom properties.

2

Overwrite declaration in import file. **What**: fix #3563 **Checklist**: - [ ] Documentation - [x] Added/updated unit tests - [x] Code complete

refactor: Modify this pointer so that it is not empty.

2

**What**: get correct `this` **Why**: this === undefined https://github.com/less/less.js/blob/1eafc06db4ed062761ce6ca65044204cf32308a1/packages/less/src/less/functions/number.js#L54  **How**: **Checklist**: - [ ] Documentation N/A - [ ] Added/updated unit tests N/A - [x] Code complete

fix: Output correct css when using css function in max().

10

**What**: fix #3604 **Why**: **How**: For the following ast node ``` [Dimension, Expression] ``` less will skip non-Dimension nodes https://github.com/less/less.js/blob/master/packages/less/src/less/functions/number.js#L26-L31 So, max(1, calc(1 + 1)) is treated as max(1). We...

Fix eslint warnimg

3

**What**: fix #3224 **Why**: **How**: Use a new utils function replace `v == null` to fix eslint warning. It's a code style issue. We also can chage ESlint config option...

fixes #165

AlphaImageLoader Filter,this topic documents a feature of Visual Filters and Transitions, which is deprecated as of Windows Internet Explorer 9. https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/platform-apis/ms532969(v=vs.85)?redirectedfrom=MSDN I think this function is no longer needed for...