您现在看到的是sourcemap，它将已编译CSS中的CSS类Map到各个SASS文件。从SASS 3.4开始，sourcemap默认启用。要禁用它们，请使用--sourcemap=none，该行将不再添加，也不会生成sourcemap。
您的命令将类似于以下内容：

sass --watch --sourcemap=none path/to/sass:path/to/css

在current Sass中：

sass --no-source-map ...

用法

$ sass --version && sass --help
1.44.0
Compile Sass to CSS.

Usage: sass <input.scss> [output.css]
       sass <input.scss>:<output.css> <input/>:<output/> <dir/>

=== Input and Output ===================
    --[no-]stdin               Read the stylesheet from stdin.
    --[no-]indented            Use the indented syntax for input from stdin.
-I, --load-path=<PATH>         A path to use when resolving imports.
                               May be passed multiple times.
-s, --style=<NAME>             Output style.
                               [expanded (default), compressed]
    --[no-]charset             Emit a @charset or BOM for CSS with non-ASCII characters.
                               (defaults to on)
    --[no-]error-css           When an error occurs, emit a stylesheet describing it.
                               Defaults to true when compiling to a file.
    --update                   Only compile out-of-date stylesheets.

=== Source Maps ========================
    --[no-]source-map          Whether to generate source maps.
                               (defaults to on)
    --source-map-urls          How to link from source maps to source files.
                               [relative (default), absolute]
    --[no-]embed-sources       Embed source file contents in source maps.
    --[no-]embed-source-map    Embed source map contents in CSS.

=== Other ==============================
-w, --watch                    Watch stylesheets and recompile when they change.
    --[no-]poll                Manually check for changes rather than using a native watcher.
                               Only valid with --watch.
    --[no-]stop-on-error       Don't compile more files once an error is encountered.
-i, --interactive              Run an interactive SassScript shell.
-c, --[no-]color               Whether to use terminal colors for messages.
    --[no-]unicode             Whether to use Unicode characters for messages.
-q, --[no-]quiet               Don't print warnings.
    --[no-]quiet-deps          Don't print compiler warnings from dependencies.
                               Stylesheets imported through load paths count as dependencies.
    --[no-]verbose             Print all deprecation warnings even when they're repetitive.
    --[no-]trace               Print full Dart stack traces for exceptions.
-h, --help                     Print this usage information.
    --version                  Print the version of Dart Sass.

（例如，在sass-maven-plugin（及其forks）中）：

-DomitSourceMapingUrl=true