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diff --git a/devtools/client/debugger/src/reducers/project-text-search.js b/devtools/client/debugger/src/reducers/project-text-search.js
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+++ b/devtools/client/debugger/src/reducers/project-text-search.js
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+/* 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/>. */
+
+// @flow
+// @format
+
+/**
+ * Project text search reducer
+ * @module reducers/project-text-search
+ */
+
+import type { Action } from "../actions/types";
+import type { Cancellable, SourceId } from "../types";
+
+export type Search = {
+  +sourceId: SourceId,
+  +filepath: string,
+  +matches: any[],
+};
+
+export type SearchOperation = Cancellable;
+
+export type StatusType =
+  | "INITIAL"
+  | "FETCHING"
+  | "CANCELLED"
+  | "DONE"
+  | "ERROR";
+export const statusType = {
+  initial: "INITIAL",
+  fetching: "FETCHING",
+  cancelled: "CANCELLED",
+  done: "DONE",
+  error: "ERROR",
+};
+
+export type ResultList = Search[];
+export type ProjectTextSearchState = {
+  +query: string,
+  +ongoingSearch: ?SearchOperation,
+  +results: ResultList,
+  +status: StatusType,
+};
+
+export function initialProjectTextSearchState(): ProjectTextSearchState {
+  return {
+    query: "",
+    results: [],
+    ongoingSearch: null,
+    status: statusType.initial,
+  };
+}
+
+function update(
+  state: ProjectTextSearchState = initialProjectTextSearchState(),
+  action: Action
+): ProjectTextSearchState {
+  switch (action.type) {
+    case "ADD_QUERY":
+      return { ...state, query: action.query };
+
+    case "ADD_SEARCH_RESULT":
+      if (action.result.matches.length === 0) {
+        return state;
+      }
+
+      const result = {
+        type: "RESULT",
+        ...action.result,
+        matches: action.result.matches.map(m => ({ type: "MATCH", ...m })),
+      };
+      return { ...state, results: [...state.results, result] };
+
+    case "UPDATE_STATUS":
+      const ongoingSearch =
+        action.status == statusType.fetching ? state.ongoingSearch : null;
+      return { ...state, status: action.status, ongoingSearch };
+
+    case "CLEAR_SEARCH_RESULTS":
+      return { ...state, results: [] };
+
+    case "ADD_ONGOING_SEARCH":
+      return { ...state, ongoingSearch: action.ongoingSearch };
+
+    case "CLEAR_SEARCH":
+    case "CLOSE_PROJECT_SEARCH":
+    case "NAVIGATE":
+      return initialProjectTextSearchState();
+  }
+  return state;
+}
+
+type OuterState = { projectTextSearch: ProjectTextSearchState };
+
+export function getTextSearchOperation(state: OuterState) {
+  return state.projectTextSearch.ongoingSearch;
+}
+
+export function getTextSearchResults(state: OuterState) {
+  return state.projectTextSearch.results;
+}
+
+export function getTextSearchStatus(state: OuterState) {
+  return state.projectTextSearch.status;
+}
+
+export function getTextSearchQuery(state: OuterState) {
+  return state.projectTextSearch.query;
+}
+
+export default update;