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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+dictionary L10nFileSourceMockFile {
+  required UTF8String path;
+  required UTF8String source;
+};
+
+enum L10nFileSourceHasFileStatus {
+    "present",
+    "missing",
+    "unknown"
+};
+
+dictionary FileSourceOptions {
+  FluentBundleAddResourceOptions addResourceOptions = {};
+};
+
+/**
+ * A `ResourceId` refers to a localization resource that is either required
+ * or optional. The default for a `ResourceId` is that the resource is required.
+ *
+ * If a required resource is missing for a given locale, then the L10nRegistry
+ * will not generate a bundle for that locale, because the resource is required
+ * to be present in order for the bundle to be considered valid.
+ *
+ * If an optional resource is missing for a given locale, then the L10nRegistry
+ * will still generate a bundle for that locale, but entries for the missing
+ * optional resource will be missing in the bundle.
+ *
+ * It is recommended to only use this sparingly, since marking many resources as
+ * optional will increase the state space that the L10nRegistry solver has to cover,
+ * and it will have a negative impact on performance.
+ *
+ * We should also strive to have valid resources for all supported locales, so using
+ * optional resources should be reserved for exceptional circumstances such as
+ * experimental features and features under development.
+ */
+dictionary ResourceId {
+  required UTF8String path;
+  boolean _optional = false;
+};
+
+typedef (UTF8String or ResourceId) L10nResourceId;
+
+/**
+ * The interface represents a single source location for
+ * the registry.
+ *
+ * Examples of sources are:
+ *  * Toolkit omni.ja Localization Directory
+ *  * Browser omni.ja Localization Directory
+ *  * Language Pack Toolkit Localization Directory
+ *  * Language Pack Browser Localization Directory
+ */
+[ChromeOnly,
+ Exposed=Window]
+interface L10nFileSource {
+  /**
+   * The `name` is the name of the `L10nFileSource`.
+   *
+   * The `metaSource` is the name of the package that contains the
+   * `L10nFileSource`, e.g. `app` for sources packaged with the browser, or
+   * `langpack` for sources packaged in an addon.
+   *
+   * The `locales` is a list of locales for which resources are contained in
+   * the `L10nFileSource`.
+   *
+   * The `prePath` is the path prefix for files contained in the `L10nFileSource`.
+   *
+   * Optional argument `index` can be used to provide a list
+   * of files available in the source.
+   *
+   * This is particularly useful for custom file sources which
+   * provide a small number of known override files allowing the
+   * registry to avoid trying I/O on the source for all
+   * files not available in the source.
+   */
+  [Throws]
+  constructor(UTF8String name, UTF8String metaSource, sequence<UTF8String> locales, UTF8String prePath, optional FileSourceOptions options = {}, optional sequence<UTF8String> index);
+
+  /**
+   * Tests may want to introduce custom file sources and
+   * register them in a custom `L10nRegistry` to mock
+   * behavior of using localization with test file sources.
+   *
+   * # Example:
+   *
+   * ```
+   * let fs = [
+   *   {
+   *     "path": "/localization/en-US/test.ftl",
+   *     "source": "key = Hello World!",
+   *   }
+   * ];
+   * let mockSource = L10nFileSource.createMock("mock", "app", ["en-US"], "/localization/{locale}/", fs);
+   *
+   * let reg = new L10nRegistry();
+   * reg.registerSources([mockSource]);
+   *
+   * let loc = new Localization(["test.ftl"], reg);
+   * let value = await loc.formatValue("key");
+   * assert(value, "Hello World!");
+   * ```
+   */
+  [Throws]
+  static L10nFileSource createMock(UTF8String name, UTF8String metasource, sequence<UTF8String> locales, UTF8String prePath, sequence<L10nFileSourceMockFile> fs);
+
+  readonly attribute UTF8String name;
+  readonly attribute UTF8String metaSource;
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<UTF8String> locales;
+  /**
+   * `prePath` is the root path used together with a relative path to construct the full path used to retrieve a file
+   * out of a file source.
+   *
+   * The `prePath` will usually contain a placeholder `{locale}` which gets replaced with a given locale.
+   */
+  readonly attribute UTF8String prePath;
+  [Pure, Cached, Frozen]
+  readonly attribute sequence<UTF8String>? index;
+
+  [Throws]
+  L10nFileSourceHasFileStatus hasFile(UTF8String locale, UTF8String path);
+  [NewObject]
+  Promise<FluentResource?> fetchFile(UTF8String locale, UTF8String path);
+  [Throws]
+  FluentResource? fetchFileSync(UTF8String locale, UTF8String path);
+};
+
+dictionary FluentBundleIteratorResult
+{
+  required FluentBundle? value;
+  required boolean done;
+};
+
+[LegacyNoInterfaceObject, Exposed=Window]
+interface FluentBundleIterator {
+  FluentBundleIteratorResult next();
+  [Alias="@@iterator"] FluentBundleIterator values();
+};
+
+[LegacyNoInterfaceObject, Exposed=Window]
+interface FluentBundleAsyncIterator {
+  [NewObject]
+  Promise<FluentBundleIteratorResult> next();
+  [Alias="@@asyncIterator"] FluentBundleAsyncIterator values();
+};
+
+dictionary L10nRegistryOptions {
+  FluentBundleOptions bundleOptions = {};
+};
+
+[ChromeOnly, Exposed=Window]
+interface L10nRegistry {
+  constructor(optional L10nRegistryOptions aOptions = {});
+
+  static L10nRegistry getInstance();
+
+  sequence<UTF8String> getAvailableLocales();
+
+  undefined registerSources(sequence<L10nFileSource> aSources);
+  undefined updateSources(sequence<L10nFileSource> aSources);
+  undefined removeSources(sequence<UTF8String> aSources);
+
+  [Throws]
+  boolean hasSource(UTF8String aName);
+  [Throws]
+  L10nFileSource? getSource(UTF8String aName);
+  sequence<UTF8String> getSourceNames();
+  undefined clearSources();
+
+  [Throws, NewObject]
+  FluentBundleIterator generateBundlesSync(sequence<UTF8String> aLocales, sequence<L10nResourceId> aResourceIds);
+
+  [Throws, NewObject]
+  FluentBundleAsyncIterator generateBundles(sequence<UTF8String> aLocales, sequence<L10nResourceId> aResourceIds);
+};