diff --git a/ts/deckconfig/BUILD.bazel b/ts/deckconfig/BUILD.bazel
index 48bc75add..7a5d4828b 100644
--- a/ts/deckconfig/BUILD.bazel
+++ b/ts/deckconfig/BUILD.bazel
@@ -5,10 +5,11 @@ load("//ts/svelte:svelte.bzl", "compile_svelte", "svelte", "svelte_check")
 load("//ts:esbuild.bzl", "esbuild")
 load("//ts:vendor.bzl", "copy_bootstrap_icons")
 load("//ts:compile_sass.bzl", "compile_sass")
+load("@npm//jest-cli:index.bzl", "jest_test")
 
 compile_sass(
-    group = "base_css",
     srcs = ["deckconfig-base.scss"],
+    group = "base_css",
     visibility = ["//visibility:public"],
     deps = [
         "//ts/sass:base_lib",
@@ -24,6 +25,9 @@ svelte_names = [f.replace(".svelte", "") for f in svelte_files]
 compile_svelte(
     name = "svelte",
     srcs = svelte_files,
+    deps = [
+        "@npm//@types/bootstrap",
+    ],
 )
 
 copy_bootstrap_icons(
@@ -50,12 +54,16 @@ ts_library(
         "icons.ts",
         "lib.ts",
         "steps.ts",
+        "textInputModal.ts",
     ],
     module_name = "deckconfig",
     deps = [
+        "TextInputModal",
         "//ts:image_module_support",
         "//ts/lib",
         "//ts/lib:backend_proto",
+        "@npm//lodash-es",
+        "@npm//svelte",
     ],
 )
 
@@ -112,5 +120,40 @@ svelte_check(
     srcs = glob([
         "*.ts",
         "*.svelte",
-    ]),
+    ]) + [
+        "@npm//@types/bootstrap",
+    ],
+)
+
+ts_library(
+    name = "test_lib",
+    srcs = glob(["*.test.ts"]),
+    tsconfig = "//ts:tsconfig.json",
+    deps = [
+        ":lib",
+        "//ts/lib:backend_proto",
+        "@npm//@types/jest",
+    ],
+)
+
+jest_test(
+    name = "test",
+    args = [
+        "--no-cache",
+        "--no-watchman",
+        "--ci",
+        "--colors",
+        "--config",
+        "$(location //ts:jest.config.js)",
+    ],
+    data = [
+        ":test_lib",
+        "//ts:jest.config.js",
+        "@npm//protobufjs",
+    ],
+    target_compatible_with = select({
+        "@platforms//os:osx": [],
+        "@platforms//os:linux": [],
+        "//conditions:default": ["@platforms//os:linux"],
+    }),
 )
diff --git a/ts/deckconfig/ConfigEditor.svelte b/ts/deckconfig/ConfigEditor.svelte
index a4ca85fa0..400f4d94a 100644
--- a/ts/deckconfig/ConfigEditor.svelte
+++ b/ts/deckconfig/ConfigEditor.svelte
@@ -3,14 +3,13 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import NewOptions from "./NewOptions.svelte";
     import ReviewOptions from "./ReviewOptions.svelte";
     import LapseOptions from "./LapseOptions.svelte";
     import GeneralOptions from "./GeneralOptions.svelte";
+    import type { DeckConfigState } from "./lib";
 
-    export let config: pb.BackendProto.DeckConfig.Config;
-    export let defaults: pb.BackendProto.DeckConfig.Config;
+    export let state: DeckConfigState;
 </script>
 
 <style lang="scss">
@@ -24,8 +23,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 </style>
 
 <div>
-    <NewOptions bind:config {defaults} />
-    <ReviewOptions bind:config {defaults} />
-    <LapseOptions bind:config {defaults} />
-    <GeneralOptions bind:config {defaults} />
+    <NewOptions {state} />
+    <ReviewOptions {state} />
+    <LapseOptions {state} />
+    <GeneralOptions {state} />
 </div>
diff --git a/ts/deckconfig/ConfigSelector.svelte b/ts/deckconfig/ConfigSelector.svelte
index 52faf5219..990add066 100644
--- a/ts/deckconfig/ConfigSelector.svelte
+++ b/ts/deckconfig/ConfigSelector.svelte
@@ -4,16 +4,19 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
     import * as tr from "anki/i18n";
-    import type { DeckConfigId, ConfigWithCount } from "./lib";
+    import type { DeckConfigState, ConfigListEntry } from "./lib";
     import OptionsDropdown from "./OptionsDropdown.svelte";
 
-    export let allConfig: ConfigWithCount[];
-    export let selectedConfigId: DeckConfigId;
+    export let state: DeckConfigState;
+    let configList = state.configList;
 
-    function configLabel(config: ConfigWithCount): string {
-        const name = config.config.name;
-        const count = tr.deckConfigUsedByDecks({ decks: config.useCount });
-        return `${name} (${count})`;
+    function configLabel(entry: ConfigListEntry): string {
+        const count = tr.deckConfigUsedByDecks({ decks: entry.useCount });
+        return `${entry.name} (${count})`;
+    }
+
+    function myblur(this: HTMLSelectElement) {
+        state.setCurrentIndex(parseInt(this.value));
     }
 </script>
 
@@ -47,12 +50,15 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 <div class="outer">
     <div class="inner">
-        <select bind:value={selectedConfigId} class="form-select">
-            {#each allConfig as config}
-                <option value={config.config.id}>{configLabel(config)}</option>
+        <!-- svelte-ignore a11y-no-onchange -->
+        <select class="form-select" on:change={myblur}>
+            {#each $configList as entry}
+                <option value={entry.idx} selected={entry.current}>
+                    {configLabel(entry)}
+                </option>
             {/each}
         </select>
 
-        <OptionsDropdown />
+        <OptionsDropdown {state} />
     </div>
 </div>
diff --git a/ts/deckconfig/DeckConfigPage.svelte b/ts/deckconfig/DeckConfigPage.svelte
index a6ae44078..84b181b50 100644
--- a/ts/deckconfig/DeckConfigPage.svelte
+++ b/ts/deckconfig/DeckConfigPage.svelte
@@ -3,24 +3,12 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import ConfigSelector from "./ConfigSelector.svelte";
     import ConfigEditor from "./ConfigEditor.svelte";
     import * as tr from "anki/i18n";
     import type { DeckConfigState } from "./lib";
 
     export let state: DeckConfigState;
-
-    let selectedConfigId = state.selectedConfigId;
-
-    let selectedConfig: pb.BackendProto.DeckConfig.Config;
-    $: {
-        selectedConfig = (
-            state.allConfigs.find((e) => e.config.id == selectedConfigId)?.config ??
-            state.allConfigs[0].config
-        ).config as pb.BackendProto.DeckConfig.Config;
-    }
-    let defaults = state.defaults;
 </script>
 
 <style>
@@ -38,12 +26,16 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
     }
 </style>
 
+<div id="modal">
+    <!-- filled in later-->
+</div>
+
 <div class="outer">
     <div class="inner">
-        <div><b>{tr.actionsOptionsFor({ val: state.deckName })}</b></div>
+        <div><b>{tr.actionsOptionsFor({ val: state.currentDeck.name })}</b></div>
 
-        <ConfigSelector allConfig={state.allConfigs} bind:selectedConfigId />
+        <ConfigSelector {state} />
 
-        <ConfigEditor config={selectedConfig} {defaults} />
+        <ConfigEditor {state} />
     </div>
 </div>
diff --git a/ts/deckconfig/GeneralOptions.svelte b/ts/deckconfig/GeneralOptions.svelte
index f91e93348..070c1fcd7 100644
--- a/ts/deckconfig/GeneralOptions.svelte
+++ b/ts/deckconfig/GeneralOptions.svelte
@@ -3,13 +3,14 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import * as tr from "anki/i18n";
     import SpinBox from "./SpinBox.svelte";
     import CheckBox from "./CheckBox.svelte";
+    import type { DeckConfigState } from "./lib";
 
-    export let config: pb.BackendProto.DeckConfig.Config;
-    export let defaults: pb.BackendProto.DeckConfig.Config;
+    export let state: DeckConfigState;
+    let config = state.currentConfig;
+    let defaults = state.defaults;
 </script>
 
 <div>
@@ -21,23 +22,23 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={30}
         max={600}
         defaultValue={defaults.capAnswerTimeToSecs}
-        bind:value={config.capAnswerTimeToSecs} />
+        bind:value={$config.capAnswerTimeToSecs} />
 
     <CheckBox
         label="Answer timer"
         subLabel={tr.schedulingShowAnswerTimer()}
         defaultValue={defaults.showTimer}
-        bind:value={config.showTimer} />
+        bind:value={$config.showTimer} />
 
     <CheckBox
         label="Autoplay"
         subLabel="Don't play audio automatically"
         defaultValue={defaults.disableAutoplay}
-        bind:value={config.disableAutoplay} />
+        bind:value={$config.disableAutoplay} />
 
     <CheckBox
         label="Question Audio"
         subLabel={tr.schedulingAlwaysIncludeQuestionSideWhenReplaying()}
         defaultValue={defaults.skipQuestionWhenReplayingAnswer}
-        bind:value={config.skipQuestionWhenReplayingAnswer} />
+        bind:value={$config.skipQuestionWhenReplayingAnswer} />
 </div>
diff --git a/ts/deckconfig/LapseOptions.svelte b/ts/deckconfig/LapseOptions.svelte
index 0c30a49dd..716a372da 100644
--- a/ts/deckconfig/LapseOptions.svelte
+++ b/ts/deckconfig/LapseOptions.svelte
@@ -3,15 +3,16 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import * as tr from "anki/i18n";
     import SpinBox from "./SpinBox.svelte";
     import SpinBoxFloat from "./SpinBoxFloat.svelte";
     import StepsInput from "./StepsInput.svelte";
     import EnumSelector from "./EnumSelector.svelte";
+    import type { DeckConfigState } from "./lib";
 
-    export let config: pb.BackendProto.DeckConfig.Config;
-    export let defaults: pb.BackendProto.DeckConfig.Config;
+    export let state: DeckConfigState;
+    let config = state.currentConfig;
+    let defaults = state.defaults;
 
     const leechChoices = [tr.actionsSuspendCard(), tr.schedulingTagOnly()];
 </script>
@@ -23,8 +24,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         label="Relearning steps"
         subLabel="Relearning steps, separated by spaces."
         defaultValue={defaults.relearnSteps}
-        value={config.relearnSteps}
-        on:changed={(evt) => (config.relearnSteps = evt.detail.value)} />
+        value={$config.relearnSteps}
+        on:changed={(evt) => ($config.relearnSteps = evt.detail.value)} />
 
     <SpinBoxFloat
         label={tr.schedulingNewInterval()}
@@ -32,27 +33,27 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={0}
         max={1}
         defaultValue={defaults.lapseMultiplier}
-        value={config.lapseMultiplier}
-        on:changed={(evt) => (config.lapseMultiplier = evt.detail.value)} />
+        value={$config.lapseMultiplier}
+        on:changed={(evt) => ($config.lapseMultiplier = evt.detail.value)} />
 
     <SpinBox
         label={tr.schedulingMinimumInterval()}
         subLabel="The minimum new interval a lapsed card will be given after relearning."
         min={1}
         defaultValue={defaults.minimumLapseInterval}
-        bind:value={config.minimumLapseInterval} />
+        bind:value={$config.minimumLapseInterval} />
 
     <SpinBox
         label={tr.schedulingLeechThreshold()}
         subLabel="Number of times Again needs to be pressed on a review card to make it a leech."
         min={1}
         defaultValue={defaults.leechThreshold}
-        bind:value={config.leechThreshold} />
+        bind:value={$config.leechThreshold} />
 
     <EnumSelector
         label={tr.schedulingLeechAction()}
         subLabel=""
         choices={leechChoices}
         defaultValue={defaults.leechAction}
-        bind:value={config.leechAction} />
+        bind:value={$config.leechAction} />
 </div>
diff --git a/ts/deckconfig/NewOptions.svelte b/ts/deckconfig/NewOptions.svelte
index 077283685..1abb92a1b 100644
--- a/ts/deckconfig/NewOptions.svelte
+++ b/ts/deckconfig/NewOptions.svelte
@@ -3,16 +3,17 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import * as tr from "anki/i18n";
     import SpinBox from "./SpinBox.svelte";
     import SpinBoxFloat from "./SpinBoxFloat.svelte";
     import CheckBox from "./CheckBox.svelte";
     import StepsInput from "./StepsInput.svelte";
     import EnumSelector from "./EnumSelector.svelte";
+    import type { DeckConfigState } from "./lib";
 
-    export let config: pb.BackendProto.DeckConfig.Config;
-    export let defaults: pb.BackendProto.DeckConfig.Config;
+    export let state: DeckConfigState;
+    let config = state.currentConfig;
+    let defaults = state.defaults;
 
     const newOrderChoices = [
         tr.schedulingShowNewCardsInOrderAdded(),
@@ -21,15 +22,18 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
     let stepsExceedGraduatingInterval: boolean;
     $: {
-        const lastLearnStepInDays = config.learnSteps.length
-            ? config.learnSteps[config.learnSteps.length - 1] / 60 / 24
+        const lastLearnStepInDays = $config.learnSteps.length
+            ? $config.learnSteps[$config.learnSteps.length - 1] / 60 / 24
             : 0;
         stepsExceedGraduatingInterval =
-            lastLearnStepInDays > config.graduatingIntervalGood;
+            lastLearnStepInDays > $config.graduatingIntervalGood;
     }
 
-    let goodExceedsEasy: boolean;
-    $: goodExceedsEasy = config.graduatingIntervalGood > config.graduatingIntervalEasy;
+    $: goodExceedsEasy =
+        $config.graduatingIntervalGood > $config.graduatingIntervalEasy;
+
+    // fixme: change impl; support warning messages
+    $: newCardsGreaterThanParent = $config.newPerDay > state.currentDeck.parentNewLimit;
 </script>
 
 <div>
@@ -40,36 +44,37 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         subLabel="Learning steps, separated by spaces."
         warn={stepsExceedGraduatingInterval}
         defaultValue={defaults.learnSteps}
-        value={config.learnSteps}
-        on:changed={(evt) => (config.learnSteps = evt.detail.value)} />
+        value={$config.learnSteps}
+        on:changed={(evt) => ($config.learnSteps = evt.detail.value)} />
 
     <EnumSelector
         label={tr.schedulingOrder()}
         subLabel=""
         choices={newOrderChoices}
         defaultValue={defaults.newCardOrder}
-        bind:value={config.newCardOrder} />
+        bind:value={$config.newCardOrder} />
 
     <SpinBox
         label={tr.schedulingNewCardsday()}
         subLabel="The maximum number of new cards to introduce in a day."
         min={0}
+        warn={newCardsGreaterThanParent}
         defaultValue={defaults.newPerDay}
-        bind:value={config.newPerDay} />
+        bind:value={$config.newPerDay} />
 
     <SpinBox
         label={tr.schedulingGraduatingInterval()}
         subLabel="Days to wait after answering Good on the last learning step."
         warn={stepsExceedGraduatingInterval || goodExceedsEasy}
         defaultValue={defaults.graduatingIntervalGood}
-        bind:value={config.graduatingIntervalGood} />
+        bind:value={$config.graduatingIntervalGood} />
 
     <SpinBox
         label={tr.schedulingEasyInterval()}
         subLabel="Days to wait after answering Easy on the first learning step."
         warn={goodExceedsEasy}
         defaultValue={defaults.graduatingIntervalEasy}
-        bind:value={config.graduatingIntervalEasy} />
+        bind:value={$config.graduatingIntervalEasy} />
 
     <SpinBoxFloat
         label={tr.schedulingStartingEase()}
@@ -77,12 +82,12 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={1.31}
         max={5}
         defaultValue={defaults.initialEase}
-        value={config.initialEase}
-        on:changed={(evt) => (config.initialEase = evt.detail.value)} />
+        value={$config.initialEase}
+        on:changed={(evt) => ($config.initialEase = evt.detail.value)} />
 
     <CheckBox
         label="Bury New"
         subLabel={tr.schedulingBuryRelatedNewCardsUntilThe()}
         defaultValue={defaults.buryNew}
-        bind:value={config.buryNew} />
+        bind:value={$config.buryNew} />
 </div>
diff --git a/ts/deckconfig/OptionsDropdown.svelte b/ts/deckconfig/OptionsDropdown.svelte
index 23d82d1b2..3dd6b7d59 100644
--- a/ts/deckconfig/OptionsDropdown.svelte
+++ b/ts/deckconfig/OptionsDropdown.svelte
@@ -2,6 +2,50 @@
 Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
+<script lang="ts">
+    // import * as tr from "anki/i18n";
+    import { textInputModal } from "./textInputModal";
+    import type { DeckConfigState } from "./lib";
+
+    export let state: DeckConfigState;
+
+    function addConfig(): void {
+        textInputModal({
+            title: "Add Config",
+            prompt: "Name:",
+            onOk: (text: string) => {
+                const trimmed = text.trim();
+                if (trimmed.length) {
+                    state.addConfig(trimmed);
+                }
+            },
+        });
+    }
+
+    function renameConfig(): void {
+        textInputModal({
+            title: "Rename Config",
+            prompt: "Name:",
+            startingValue: state.getCurrentName(),
+            onOk: (text: string) => {
+                state.setCurrentName(text);
+            },
+        });
+    }
+
+    function removeConfig(): void {
+        setTimeout(() => {
+            if (confirm("Are you sure?")) {
+                try {
+                    state.removeCurrentConfig();
+                } catch (err) {
+                    alert(err);
+                }
+            }
+        }, 100);
+    }
+</script>
+
 <style>
     :global(svg) {
         vertical-align: text-bottom;
@@ -18,13 +62,16 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         <span class="visually-hidden">Toggle Dropdown</span>
     </button>
     <ul class="dropdown-menu">
-        <li><a class="dropdown-item" href={'#'}>Add</a></li>
-        <li><a class="dropdown-item" href={'#'}>Rename</a></li>
-        <li><a class="dropdown-item" href={'#'}>Remove</a></li>
+        <li><a class="dropdown-item" href={'#'} on:click={addConfig}>Add Config</a></li>
+        <li>
+            <a class="dropdown-item" href={'#'} on:click={renameConfig}>Rename Config</a>
+        </li>
+        <li>
+            <a class="dropdown-item" href={'#'} on:click={removeConfig}>Remove Config</a>
+        </li>
         <li>
             <hr class="dropdown-divider" />
         </li>
-        <input type="checkbox" class="form-check-input" id="dropdownCheck" />
-        <label class="form-check-label" for="dropdownCheck"> Apply to Children </label>
+        <li><a class="dropdown-item" href={'#'}>Apply to Child Decks</a></li>
     </ul>
 </div>
diff --git a/ts/deckconfig/ReviewOptions.svelte b/ts/deckconfig/ReviewOptions.svelte
index c803ede3a..0e9e73751 100644
--- a/ts/deckconfig/ReviewOptions.svelte
+++ b/ts/deckconfig/ReviewOptions.svelte
@@ -3,14 +3,15 @@ Copyright: Ankitects Pty Ltd and contributors
 License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 -->
 <script lang="ts">
-    import type pb from "anki/backend_proto";
     import * as tr from "anki/i18n";
     import SpinBox from "./SpinBox.svelte";
     import SpinBoxFloat from "./SpinBoxFloat.svelte";
     import CheckBox from "./CheckBox.svelte";
+    import type { DeckConfigState } from "./lib";
 
-    export let config: pb.BackendProto.DeckConfig.Config;
-    export let defaults: pb.BackendProto.DeckConfig.Config;
+    export let state: DeckConfigState;
+    let config = state.currentConfig;
+    let defaults = state.defaults;
 </script>
 
 <div>
@@ -21,7 +22,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         subLabel="The maximum number of reviews cards to show in a day."
         min={0}
         defaultValue={defaults.reviewsPerDay}
-        bind:value={config.reviewsPerDay} />
+        bind:value={$config.reviewsPerDay} />
 
     <SpinBoxFloat
         label={tr.schedulingEasyBonus()}
@@ -29,8 +30,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={1}
         max={3}
         defaultValue={defaults.easyMultiplier}
-        value={config.easyMultiplier}
-        on:changed={(evt) => (config.easyMultiplier = evt.detail.value)} />
+        value={$config.easyMultiplier}
+        on:changed={(evt) => ($config.easyMultiplier = evt.detail.value)} />
 
     <SpinBoxFloat
         label={tr.schedulingIntervalModifier()}
@@ -38,8 +39,8 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={0.5}
         max={2}
         defaultValue={defaults.intervalMultiplier}
-        value={config.intervalMultiplier}
-        on:changed={(evt) => (config.intervalMultiplier = evt.detail.value)} />
+        value={$config.intervalMultiplier}
+        on:changed={(evt) => ($config.intervalMultiplier = evt.detail.value)} />
 
     <SpinBox
         label={tr.schedulingMaximumInterval()}
@@ -47,7 +48,7 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={1}
         max={365 * 100}
         defaultValue={defaults.maximumReviewInterval}
-        bind:value={config.maximumReviewInterval} />
+        bind:value={$config.maximumReviewInterval} />
 
     <SpinBoxFloat
         label={tr.schedulingHardInterval()}
@@ -55,12 +56,12 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         min={0.5}
         max={1.3}
         defaultValue={defaults.hardMultiplier}
-        value={config.hardMultiplier}
-        on:changed={(evt) => (config.hardMultiplier = evt.detail.value)} />
+        value={$config.hardMultiplier}
+        on:changed={(evt) => ($config.hardMultiplier = evt.detail.value)} />
 
     <CheckBox
         label="Bury Reviews"
         subLabel={tr.schedulingBuryRelatedReviewsUntilTheNext()}
         defaultValue={defaults.buryReviews}
-        bind:value={config.buryReviews} />
+        bind:value={$config.buryReviews} />
 </div>
diff --git a/ts/deckconfig/TextInputModal.svelte b/ts/deckconfig/TextInputModal.svelte
new file mode 100644
index 000000000..d15b0d165
--- /dev/null
+++ b/ts/deckconfig/TextInputModal.svelte
@@ -0,0 +1,93 @@
+<!--
+Copyright: Ankitects Pty Ltd and contributors
+License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+-->
+<script lang="ts">
+    /* eslint
+    @typescript-eslint/no-non-null-assertion: "off",
+    */
+    import { onMount, onDestroy } from "svelte";
+    import Modal from "bootstrap/js/dist/modal";
+
+    export let title: string;
+    export let prompt: string;
+    export let startingValue = "";
+    export let onOk: (text: string) => void;
+
+    let inputRef: HTMLInputElement;
+    let modal: Modal;
+
+    function onShown(): void {
+        inputRef.focus();
+    }
+
+    function onHidden(): void {
+        const container = document.getElementById("modal")!;
+        container.removeChild(container.firstElementChild!);
+    }
+
+    function onOkClicked(): void {
+        onOk(inputRef.value);
+        modal.hide();
+    }
+
+    function onKeyUp(evt: KeyboardEvent): void {
+        if (evt.code === "Enter") {
+            onOkClicked();
+        }
+    }
+
+    onMount(() => {
+        const container = document.getElementById("modal")!;
+        container.addEventListener("shown.bs.modal", onShown);
+        container.addEventListener("hidden.bs.modal", onHidden);
+        modal = new Modal(container.firstElementChild!, {});
+        modal.show();
+    });
+
+    onDestroy(() => {
+        const container = document.getElementById("modal")!;
+        container.removeEventListener("shown.bs.modal", onShown);
+        container.removeEventListener("hidden.bs.modal", onHidden);
+    });
+</script>
+
+<div class="modal fade" tabindex="-1" aria-labelledby="modalLabel" aria-hidden="true">
+    <div class="modal-dialog" on:keyup={onKeyUp}>
+        <div class="modal-content">
+            <div class="modal-header">
+                <h5 class="modal-title" id="modalLabel">{title}</h5>
+                <button
+                    type="button"
+                    class="btn-close"
+                    data-bs-dismiss="modal"
+                    aria-label="Close" />
+            </div>
+            <div class="modal-body">
+                <form>
+                    <div class="mb-3">
+                        <label
+                            for="prompt-input"
+                            class="col-form-label">{prompt}</label>
+                        <input
+                            id="prompt-input"
+                            bind:this={inputRef}
+                            type="text"
+                            class="form-control"
+                            value={startingValue} />
+                    </div>
+                </form>
+            </div>
+            <div class="modal-footer">
+                <button
+                    type="button"
+                    class="btn btn-secondary"
+                    data-bs-dismiss="modal">Cancel</button>
+                <button
+                    type="button"
+                    class="btn btn-primary"
+                    on:click={onOkClicked}>OK</button>
+            </div>
+        </div>
+    </div>
+</div>
diff --git a/ts/deckconfig/deckconfig-base.scss b/ts/deckconfig/deckconfig-base.scss
index 08ee4ad6b..840bb5e28 100644
--- a/ts/deckconfig/deckconfig-base.scss
+++ b/ts/deckconfig/deckconfig-base.scss
@@ -5,6 +5,8 @@
 @import "ts/sass/bootstrap/forms";
 @import "ts/sass/bootstrap/buttons";
 @import "ts/sass/bootstrap/button-group";
+@import "ts/sass/bootstrap/modal";
+@import "ts/sass/bootstrap/close";
 
 .night-mode {
     @include scrollbar.night-mode;
diff --git a/ts/deckconfig/index.ts b/ts/deckconfig/index.ts
index 015fd6788..6cf9e49bd 100644
--- a/ts/deckconfig/index.ts
+++ b/ts/deckconfig/index.ts
@@ -1,7 +1,7 @@
 // Copyright: Ankitects Pty Ltd and contributors
 // License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
-import { getDeckConfigInfo, stateFromUpdateData } from "./lib";
+import { getDeckConfigInfo, DeckConfigState } from "./lib";
 import { setupI18n, ModuleName } from "anki/i18n";
 import { checkNightMode } from "anki/nightmode";
 import DeckConfigPage from "./DeckConfigPage.svelte";
@@ -15,7 +15,7 @@ export async function deckConfig(
         modules: [ModuleName.SCHEDULING, ModuleName.ACTIONS, ModuleName.DECK_CONFIG],
     });
     const info = await getDeckConfigInfo(deckId);
-    const state = stateFromUpdateData(info);
+    const state = new DeckConfigState(info);
     new DeckConfigPage({
         target,
         props: { state },
diff --git a/ts/deckconfig/lib.ts b/ts/deckconfig/lib.ts
index 39501529a..f9e294a0c 100644
--- a/ts/deckconfig/lib.ts
+++ b/ts/deckconfig/lib.ts
@@ -7,6 +7,9 @@
 
 import pb from "anki/backend_proto";
 import { postRequest } from "anki/postrequest";
+import { Writable, writable, get, Readable, readable } from "svelte/store";
+import { isEqual, cloneDeep } from "lodash-es";
+import * as tr from "anki/i18n";
 
 export async function getDeckConfigInfo(
     deckId: number
@@ -23,30 +26,148 @@ export interface ConfigWithCount {
     useCount: number;
 }
 
-export interface DeckConfigState {
-    deckName: string;
-    selectedConfigId: DeckConfigId;
-    removedConfigs: DeckConfigId[];
-    renamedConfigs: Map<DeckConfigId, string>;
-    allConfigs: ConfigWithCount[];
-    defaults: pb.BackendProto.DeckConfig.Config;
+/// Info for showing the top selector
+export interface ConfigListEntry {
+    idx: number;
+    name: string;
+    useCount: number;
+    current: boolean;
 }
 
-export function stateFromUpdateData(
-    data: pb.BackendProto.DeckConfigForUpdate
-): DeckConfigState {
-    const current = data.currentDeck as pb.BackendProto.DeckConfigForUpdate.CurrentDeck;
-    return {
-        deckName: current.name,
-        selectedConfigId: current.configId,
-        removedConfigs: [],
-        renamedConfigs: new Map(),
-        allConfigs: data.allConfig.map((config) => {
+type ConfigInner = pb.BackendProto.DeckConfig.Config;
+export class DeckConfigState {
+    readonly currentConfig: Writable<ConfigInner>;
+    readonly configList: Readable<ConfigListEntry[]>;
+    readonly currentDeck: pb.BackendProto.DeckConfigForUpdate.CurrentDeck;
+    readonly defaults: ConfigInner;
+
+    private configs: ConfigWithCount[];
+    private selectedIdx: number;
+    private configListSetter?: (val: ConfigListEntry[]) => void;
+    private removedConfigs: DeckConfigId[] = [];
+
+    constructor(data: pb.BackendProto.DeckConfigForUpdate) {
+        this.currentDeck = data.currentDeck as pb.BackendProto.DeckConfigForUpdate.CurrentDeck;
+        this.defaults = data.defaults!.config! as ConfigInner;
+        this.configs = data.allConfig.map((config) => {
             return {
                 config: config.config as pb.BackendProto.DeckConfig,
                 useCount: config.useCount!,
             };
-        }),
-        defaults: data.defaults!.config! as pb.BackendProto.DeckConfig.Config,
-    };
+        });
+        this.selectedIdx =
+            this.configs.findIndex((c) => c.config.id === this.currentDeck.configId) ??
+            0;
+        // decrement the use count of the starting item, as we'll apply +1 to currently
+        // selected one at display time
+        this.configs[this.selectedIdx].useCount -= 1;
+        this.currentConfig = writable(this.getCurrentConfig());
+        this.configList = readable(this.getConfigList(), (set) => {
+            this.configListSetter = set;
+            return undefined;
+        });
+    }
+
+    setCurrentIndex(index: number): void {
+        this.saveCurrentConfig();
+        this.selectedIdx = index;
+        this.updateCurrentConfig();
+        // use counts have changed
+        this.updateConfigList();
+    }
+
+    /// Persist any changes made to the current config into the list of configs.
+    saveCurrentConfig(): void {
+        const config = get(this.currentConfig);
+        if (!isEqual(config, this.configs[this.selectedIdx].config.config)) {
+            console.log("save");
+            this.configs[this.selectedIdx].config.config = config;
+            this.configs[this.selectedIdx].config.mtimeSecs = 0;
+        } else {
+            console.log("no changes");
+        }
+    }
+
+    getCurrentName(): string {
+        return this.configs[this.selectedIdx].config.name;
+    }
+
+    setCurrentName(name: string): void {
+        if (this.configs[this.selectedIdx].config.name === name) {
+            return;
+        }
+        const uniqueName = this.ensureNewNameUnique(name);
+        this.configs[this.selectedIdx].config.name = uniqueName;
+        this.configs[this.selectedIdx].config.mtimeSecs = 0;
+        this.updateConfigList();
+    }
+
+    /// Adds a new config, making it current.
+    /// not already a new config.
+    addConfig(name: string): void {
+        const uniqueName = this.ensureNewNameUnique(name);
+        const config = pb.BackendProto.DeckConfig.create({
+            id: 0,
+            name: uniqueName,
+            config: cloneDeep(this.defaults),
+        });
+        const configWithCount = { config, useCount: 0 };
+        this.configs.push(configWithCount);
+        this.selectedIdx = this.configs.length - 1;
+        this.updateCurrentConfig();
+        this.updateConfigList();
+    }
+
+    /// Will throw if the default deck is selected.
+    removeCurrentConfig(): void {
+        const currentId = this.configs[this.selectedIdx].config.id;
+        if (currentId === 1) {
+            throw "can't remove default config";
+        }
+
+        if (currentId !== 0) {
+            this.removedConfigs.push(currentId);
+        }
+        this.configs.splice(this.selectedIdx, 1);
+        this.selectedIdx = Math.max(0, this.selectedIdx - 1);
+        this.updateCurrentConfig();
+        this.updateConfigList();
+    }
+
+    private ensureNewNameUnique(name: string): string {
+        if (this.configs.find((e) => e.config.name === name) !== undefined) {
+            return name + (new Date().getTime() / 1000).toFixed(0);
+        } else {
+            return name;
+        }
+    }
+
+    private updateCurrentConfig(): void {
+        this.currentConfig.set(this.getCurrentConfig());
+    }
+
+    private updateConfigList(): void {
+        this.configListSetter?.(this.getConfigList());
+    }
+
+    /// Returns a copy of the currently selected config.
+    private getCurrentConfig(): ConfigInner {
+        return cloneDeep(this.configs[this.selectedIdx].config.config as ConfigInner);
+    }
+
+    private getConfigList(): ConfigListEntry[] {
+        const list: ConfigListEntry[] = this.configs.map((c, idx) => {
+            const useCount = c.useCount + (idx === this.selectedIdx ? 1 : 0);
+            return {
+                name: c.config.name,
+                current: idx === this.selectedIdx,
+                idx,
+                useCount,
+            };
+        });
+        list.sort((a, b) =>
+            a.name.localeCompare(b.name, tr.i18n.langs, { sensitivity: "base" })
+        );
+        return list;
+    }
 }
diff --git a/ts/deckconfig/textInputModal.ts b/ts/deckconfig/textInputModal.ts
new file mode 100644
index 000000000..2e1b26e1a
--- /dev/null
+++ b/ts/deckconfig/textInputModal.ts
@@ -0,0 +1,23 @@
+// Copyright: Ankitects Pty Ltd and contributors
+// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
+
+/* eslint
+@typescript-eslint/no-non-null-assertion: "off",
+ */
+
+import TextInputModal from "./TextInputModal.svelte";
+
+export interface TextInputModalProps {
+    title: string;
+    prompt: string;
+    startingValue?: string;
+    onOk: (string) => void;
+}
+
+export function textInputModal(props: TextInputModalProps): TextInputModal {
+    const target = document.getElementById("modal")!;
+    return new TextInputModal({
+        target,
+        props,
+    });
+}
diff --git a/ts/lib/BUILD.bazel b/ts/lib/BUILD.bazel
index b112ad3cc..d5bb24e1a 100644
--- a/ts/lib/BUILD.bazel
+++ b/ts/lib/BUILD.bazel
@@ -100,7 +100,6 @@ jest_test(
     data = [
         ":test_lib",
         "//ts:jest.config.js",
-        "//ts:package.json",
         "@npm//protobufjs",
     ],
     target_compatible_with = select({