export declare class PreprocessorTest {
    "raises an error if a file that isn't css is missing a preprocessor."(): Promise<void>;
    "converts a file to css"(): Promise<void>;
    "processes css as a second pass when a css preprocessor is available."(): Promise<void>;
    "can disable preprocessor chaining."(): Promise<void>;
    "handles input sourcemaps in final output sourcemap"(): void;
}
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