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Filename : importer.d.ts
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import {LegacyPluginThis} from './plugin_this';

/**
 * The value of `this` in the context of a {@link LegacyImporter} function.
 *
 * @category Legacy
 * @deprecated This is only used by the legacy {@link render} and {@link
 * renderSync} APIs. Use {@link Importer} with {@link compile}, {@link
 * compileString}, {@link compileAsync}, and {@link compileStringAsync} instead.
 */
interface LegacyImporterThis extends LegacyPluginThis {
  /**
   * Whether the importer is being invoked because of a Sass `@import` rule, as
   * opposed to a `@use` or `@forward` rule.
   *
   * This should *only* be used for determining whether or not to load
   * [import-only files](https://sass-lang.com/documentation/at-rules/import#import-only-files).
   *
   * @compatibility dart: "1.33.0", node: false
   */
  fromImport: boolean;
}

/**
 * The result of running a {@link LegacyImporter}. It must be one of the
 * following types:
 *
 * * An object with the key `contents` whose value is the contents of a stylesheet
 *   (in SCSS syntax). This causes Sass to load that stylesheet’s contents.
 *
 * * An object with the key `file` whose value is a path on disk. This causes Sass
 *   to load that file as though it had been imported directly.
 *
 * * `null`, which indicates that it doesn’t recognize the URL and another
 *   importer should be tried instead.
 *
 * * An [Error](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error)
 *   object, indicating that importing failed.
 *
 * @category Legacy
 * @deprecated This only works with the legacy {@link render} and {@link
 * renderSync} APIs. Use {@link ImporterResult} with {@link compile}, {@link
 * compileString}, {@link compileAsync}, and {@link compileStringAsync} instead.
 */
export type LegacyImporterResult =
  | {file: string}
  | {contents: string}
  | Error
  | null;

/**
 * A synchronous callback that implements custom Sass loading logic for
 * [`@import` rules](https://sass-lang.com/documentation/at-rules/import) and
 * [`@use` rules](https://sass-lang.com/documentation/at-rules/use). This can be
 * passed to {@link LegacySharedOptions.importer} for either {@link render} or
 * {@link renderSync}.
 *
 * See {@link LegacySharedOptions.importer} for more detailed documentation.
 *
 * ```js
 * sass.renderSync({
 *   file: "style.scss",
 *   importer: [
 *     function(url, prev) {
 *       if (url != "big-headers") return null;
 *
 *       return {
 *         contents: 'h1 { font-size: 40px; }'
 *       };
 *     }
 *   ]
 * });
 * ```
 *
 * @param url - The `@use` or `@import` rule’s URL as a string, exactly as it
 * appears in the stylesheet.
 *
 * @param prev - A string identifying the stylesheet that contained the `@use`
 * or `@import`. This string’s format depends on how that stylesheet was loaded:
 *
 * * If the stylesheet was loaded from the filesystem, it’s the absolute path of
 *   its file.
 * * If the stylesheet was loaded from an importer that returned its contents,
 *   it’s the URL of the `@use` or `@import` rule that loaded it.
 * * If the stylesheet came from the data option, it’s the string "stdin".
 *
 * @category Legacy
 * @deprecated This only works with the legacy {@link render} and {@link
 * renderSync} APIs. Use {@link Importer} with {@link compile}, {@link
 * compileString}, {@link compileAsync}, and {@link compileStringAsync} instead.
 */
type LegacySyncImporter = (
  this: LegacyImporterThis,
  url: string,
  prev: string
) => LegacyImporterResult;

/**
 * An asynchronous callback that implements custom Sass loading logic for
 * [`@import` rules](https://sass-lang.com/documentation/at-rules/import) and
 * [`@use` rules](https://sass-lang.com/documentation/at-rules/use). This can be
 * passed to {@link LegacySharedOptions.importer} for either {@link render} or
 * {@link renderSync}.
 *
 * An asynchronous importer must return `undefined`, and then call `done` with
 * the result of its {@link LegacyImporterResult} once it's done running.
 *
 * See {@link LegacySharedOptions.importer} for more detailed documentation.
 *
 * ```js
 * sass.render({
 *   file: "style.scss",
 *   importer: [
 *     function(url, prev, done) {
 *       if (url != "big-headers") done(null);
 *
 *       done({
 *         contents: 'h1 { font-size: 40px; }'
 *       });
 *     }
 *   ]
 * });
 * ```
 *
 * @param url - The `@use` or `@import` rule’s URL as a string, exactly as it
 * appears in the stylesheet.
 *
 * @param prev - A string identifying the stylesheet that contained the `@use`
 * or `@import`. This string’s format depends on how that stylesheet was loaded:
 *
 * * If the stylesheet was loaded from the filesystem, it’s the absolute path of
 *   its file.
 * * If the stylesheet was loaded from an importer that returned its contents,
 *   it’s the URL of the `@use` or `@import` rule that loaded it.
 * * If the stylesheet came from the data option, it’s the string "stdin".
 *
 * @param done - The callback to call once the importer has finished running.
 *
 * @category Legacy
 * @deprecated This only works with the legacy {@link render} and {@link
 * renderSync} APIs. Use {@link Importer} with {@link compile}, {@link
 * compileString}, {@link compileAsync}, and {@link compileStringAsync} instead.
 */
type LegacyAsyncImporter = (
  this: LegacyImporterThis,
  url: string,
  prev: string,
  done: (result: LegacyImporterResult) => void
) => void;

/**
 * A callback that implements custom Sass loading logic for [`@import`
 * rules](https://sass-lang.com/documentation/at-rules/import) and [`@use`
 * rules](https://sass-lang.com/documentation/at-rules/use). For {@link
 * renderSync}, this must be a {@link LegacySyncImporter} which returns its
 * result directly; for {@link render}, it may be either a {@link
 * LegacySyncImporter} or a {@link LegacyAsyncImporter} which calls a callback
 * with its result.
 *
 * See {@link LegacySharedOptions.importer} for more details.
 *
 * @category Legacy
 * @deprecated This only works with the legacy {@link render} and {@link
 * renderSync} APIs. Use {@link Importer} with {@link compile}, {@link
 * compileString}, {@link compileAsync}, and {@link compileStringAsync} instead.
 */
export type LegacyImporter<sync = 'sync' | 'async'> = sync extends 'async'
  ? LegacySyncImporter | LegacyAsyncImporter
  : LegacySyncImporter;