重大变化：重复变量标志

变量仅允许单个 !global 或 !default 标志。重复的标志永远不会产生任何额外的效果，这只是确保样式表更加一致。

阶段 1阶段 1 permalink

¥Phase 1

Dart Sass: since 2.0.0
LibSass: ✗
Ruby Sass: ✗

从 Dart Sass 2.0.0 开始，如果单个变量声明有多个 !global 或 !default 标志，这将是一个语法错误。这意味着 $var: value !default !default 将被禁止。$var: value !global !default 仍将被允许。

¥Starting in Dart Sass 2.0.0, if a single variable declaration has more than one each !global or !default flag, this will be a syntax error. This means that $var: value !default !default will be forbidden. $var: value !global !default will still be allowed.

过渡期过渡期 permalink

¥Transition Period

Dart Sass: since 1.62.0
LibSass: ✗
Ruby Sass: ✗

在 Dart Sass 2.0.0 发布之前，标志的多个副本只会产生弃用警告。

¥Until Dart Sass 2.0.0 is released, multiple copies of a flag just produce deprecation warnings.

Can I Silence the Warnings?Can I Silence the Warnings? permalink

Sass provides a powerful suite of options for managing which deprecation warnings you see and when.

Terse and Verbose ModeTerse and Verbose Mode permalink

By default, Sass runs in terse mode, where it will only print each type of deprecation warning five times before it silences additional warnings. This helps ensure that users know when they need to be aware of an upcoming breaking change without creating an overwhelming amount of console noise.

If you run Sass in verbose mode instead, it will print every deprecation warning it encounters. This can be useful for tracking the remaining work to be done when fixing deprecations. You can enable verbose mode using the --verbose flag on the command line, or the verbose option in the JavaScript API.

⚠️ Heads up!

When running from the JS API, Sass doesn’t share any information across compilations, so by default it’ll print five warnings for each stylesheet that’s compiled. However, you can fix this by writing (or asking the author of your favorite framework’s Sass plugin to write) a custom Logger that only prints five errors per deprecation and can be shared across multiple compilations.

Silencing Deprecations in DependenciesSilencing Deprecations in Dependencies permalink

Sometimes, your dependencies have deprecation warnings that you can’t do anything about. You can silence deprecation warnings from dependencies while still printing them for your app using the --quiet-deps flag on the command line, or the quietDeps option in the JavaScript API.

For the purposes of this flag, a "dependency" is any stylesheet that’s not just a series of relative loads from the entrypoint stylesheet. This means anything that comes from a load path, and most stylesheets loaded through custom importers.

Silencing Specific DeprecationsSilencing Specific Deprecations permalink

If you know that one particular deprecation isn’t a problem for you, you can silence warnings for that specific deprecation using the --silence-deprecation flag on the command line, or the silenceDeprecations option in the JavaScript API.