diff --git a/assets/api.ts b/assets/api.ts
index 5e3374c..aa45b9c 100644
--- a/assets/api.ts
+++ b/assets/api.ts
@@ -26,6 +26,16 @@ export interface IEntry {
   tag: string[]
 }
 
+export interface ILibrary {
+  id: string
+  title: string
+  list: string[]
+  type: IType
+  description: string
+  tag: string[]
+  isShared?: boolean
+}
+
 export type ILookup<T> = T & {
   offset?: number
   limit?: number
@@ -48,9 +58,9 @@ class Api {
   async setWanikaniApiKey(apiKey?: string) {
     const setApiKey = () => {
       if (apiKey) {
-        this.axios.defaults.headers.common.Authorization = `Bearer ${apiKey}`
+        this.axios.defaults.headers.common['Authorization'] = `Bearer ${apiKey}`
       } else {
-        delete this.axios.defaults.headers.common.Authorization
+        delete this.axios.defaults.headers.common['Authorization']
       }
     }
 
@@ -99,20 +109,17 @@ class Api {
     return r
   }
 
-  async user_updateSettings(u: {
-    levelMin?: number
-    level_browser?: ILevelBrowser
-  }) {
+  async user_updateSettings(u: Omit<IUserSettings, 'identifier' | 'level'>) {
     return await this.axios.patch('/api/user', u)
   }
 
-  async quiz_getMany(params: {
+  async quiz_getMany(payload: {
     entries: string[]
     select: string[]
     type?: string
     direction?: string
   }) {
-    return await this.axios.post('/api/quiz/getMany', params).then(
+    return await this.axios.post('/api/quiz/getMany', payload).then(
       (r) =>
         r.data as {
           result: {
@@ -123,6 +130,18 @@ class Api {
     )
   }
 
+  async quiz_getSrsLevel(payload: { entries: string[]; type: IType }) {
+    return await this.axios.post('/api/quiz/getSrsLevel', payload).then(
+      (r) =>
+        r.data as {
+          result: {
+            entry: string
+            srsLevel: number
+          }[]
+        }
+    )
+  }
+
   async quiz_create(payload: { entries: string[]; type: IType }) {
     return await this.axios.put('/api/quiz', payload).then(
       (r) =>
@@ -224,7 +243,9 @@ class Api {
     )
   }
 
-  async all_getLookup(params: ILookup<{ entry: string; type: IType }>) {
+  async all_getLookup(
+    params: ILookup<{ entry: string; type: IType; forced?: boolean }>
+  ) {
     params.offset = params.offset || 0
     params.limit = params.limit || 5
 
@@ -271,6 +292,12 @@ class Api {
       )
   }
 
+  async library_getQuery(params: ILookup<{ q: string }>) {
+    return await this.axios
+      .get('/api/library/q', { params })
+      .then((r) => r.data as ILookupResult<ILibrary>)
+  }
+
   async library_getLevelList(payload: {
     type: ITypeLevel
     settings: ILevelBrowserByType
@@ -285,6 +312,25 @@ class Api {
         }
     )
   }
+
+  async library_create(payload: Omit<ILibrary, 'id'>) {
+    return await this.axios.put('/api/library', payload).then(
+      (r) =>
+        r.data as {
+          id: string
+        }
+    )
+  }
+
+  async library_update(payload: ILibrary) {
+    return await this.axios.patch('/api/library', payload, {
+      params: { id: payload.id },
+    })
+  }
+
+  async library_delete(params: { id: string }) {
+    return await this.axios.delete('/api/library', { params })
+  }
 }
 
 export const api = new Api()
diff --git a/assets/util.ts b/assets/util.ts
index b75e646..897d6a7 100644
--- a/assets/util.ts
+++ b/assets/util.ts
@@ -45,7 +45,7 @@ export const doMapKeypress = (
 export function shuffle<T>(a: T[]) {
   for (let i = a.length - 1; i > 0; i--) {
     const j = Math.floor(Math.random() * (i + 1))
-    ;[a[i], a[j]] = [a[j], a[i]]
+    ;[a[i], a[j]] = [a[j]!, a[i]!]
   }
   return a
 }
@@ -60,7 +60,7 @@ export function sample<T>(arr: T[], size: number): T[] {
     outN.push(...allN.splice(Math.floor(Math.random() * allN.length), 1))
   }
 
-  return outN.map((n) => arr[n])
+  return outN.map((n) => arr[n]!)
 }
 
 export function capitalize(s: string): string {
@@ -72,7 +72,7 @@ export function capitalize(s: string): string {
   }
 
   if (!s) return s
-  return s[0].toLocaleUpperCase() + s.substr(1)
+  return s[0]!.toLocaleUpperCase() + s.substr(1)
 }
 
 export function jsonClone<T>(o: T): T {
diff --git a/components/cards/LibraryCard.vue b/components/cards/LibraryCard.vue
new file mode 100644
index 0000000..782953b
--- /dev/null
+++ b/components/cards/LibraryCard.vue
@@ -0,0 +1,329 @@
+<template>
+  <section>
+    <div class="card">
+      <header class="card-header" style="display: flex; flex-direction: row">
+        <div class="card-header-title" style="flex-grow: 1">
+          <p
+            class="has-context"
+            @click="
+              (evt) => {
+                selected = currentData
+                $refs.context.open(evt)
+              }
+            "
+            @contextmenu.prevent="
+              (evt) => {
+                selected = currentData
+                $refs.context.open(evt)
+              }
+            "
+          >
+            {{ title }}
+          </p>
+          <div
+            @click="isOpen = !isOpen"
+            style="flex-grow: 1; height: 100%; cursor: pointer"
+          ></div>
+        </div>
+        <a
+          v-if="isOpen"
+          class="card-header-icon"
+          role="button"
+          @click="isList = !isList"
+        >
+          <b-icon :icon="isList ? 'th' : 'list-ul'"> </b-icon>
+        </a>
+        <a class="card-header-icon" role="button" @click="isOpen = !isOpen">
+          <b-icon :icon="isOpen ? 'caret-down' : 'caret-up'"> </b-icon>
+        </a>
+      </header>
+
+      <div
+        v-if="isOpen"
+        class="card-content"
+        :data-mode="isList ? 'list' : 'item'"
+      >
+        <div v-if="isList">
+          <b-table
+            :data="list"
+            paginated
+            :per-page="perPage"
+            @page-change="(p) => makeList(p)"
+          >
+            <b-table-column field="entry" label="Entry" v-slot="props">
+              <span
+                :class="
+                  'tag clickable is-medium ' + getTagClass(props.row.entry)
+                "
+                @click.stop="
+                  (evt) => {
+                    selected = [props.row.entry]
+                    $refs.context.open(evt)
+                  }
+                "
+                @contextmenu.prevent="
+                  (evt) => {
+                    selected = [props.row.entry]
+                    $refs.context.open(evt)
+                  }
+                "
+              >
+                {{ props.row.entry }}
+              </span>
+
+              <span
+                v-for="t in props.row.alt || []"
+                :key="t"
+                :class="'tag clickable is-medium ' + getTagClass(t)"
+                @click.stop="
+                  (evt) => {
+                    selected = [t]
+                    $refs.context.open(evt)
+                  }
+                "
+                @contextmenu.prevent="
+                  (evt) => {
+                    selected = [t]
+                    $refs.context.open(evt)
+                  }
+                "
+              >
+                {{ t }}
+              </span>
+            </b-table-column>
+            <b-table-column field="reading" label="Pinyin" v-slot="props">
+              {{ (props.row.reading || []).join(' / ') }}
+            </b-table-column>
+            <b-table-column field="english" label="English" v-slot="props">
+              <div
+                class="no-scrollbar"
+                style="max-width: 40vw; max-height: 200px"
+              >
+                {{ (props.row.english || []).join(' / ') }}
+              </div>
+            </b-table-column>
+
+            <template slot="empty">
+              <div style="position: relative; height: 120px">
+                <b-loading active :is-full-page="false"></b-loading>
+              </div>
+            </template>
+          </b-table>
+        </div>
+
+        <div v-else>
+          <span
+            v-for="t in currentData"
+            :key="t"
+            :class="'tag clickable is-medium ' + getTagClass(t)"
+            @click.stop="
+              (evt) => {
+                selected = [t]
+                $refs.context.open(evt)
+              }
+            "
+            @contextmenu.prevent="
+              (evt) => {
+                selected = [t]
+                $refs.context.open(evt)
+              }
+            "
+          >
+            {{ t }}
+          </span>
+        </div>
+      </div>
+    </div>
+
+    <ContextMenu
+      ref="context"
+      :type="type"
+      :entry="selected"
+      :description="title + ' ' + description"
+      :additional="additional"
+      @quiz:added="(evt) => reload(evt.entries)"
+      @quiz:removed="(evt) => reload(evt.entries)"
+    />
+  </section>
+</template>
+
+<script lang="ts">
+import { Vue, Component, Ref, Prop } from 'nuxt-property-decorator'
+import { api, IEntry, IType } from '~/assets/api'
+import ContextMenu from '../ContextMenu.vue'
+
+type ILibraryEntry = Pick<
+  IEntry,
+  'entry' | 'reading' | 'translation' | 'type'
+> & {
+  originalEntry: string
+}
+
+@Component<LibraryCard>({
+  components: {
+    ContextMenu,
+  },
+  watch: {
+    open() {
+      this.isOpen = this.open
+    },
+    isList() {
+      this.makeList()
+    },
+    isOpen() {
+      this.reload(this.entries)
+    },
+    entries() {
+      this.isList = false
+      this.list = []
+
+      this.$nextTick(() => {
+        this.reload(this.entries)
+      })
+    },
+  },
+  created() {
+    this.isOpen = this.open
+  },
+})
+export default class LibraryCard extends Vue {
+  @Prop() title!: string
+  @Prop() entries!: string[]
+  @Prop() type!: IType
+  @Prop({ default: '' }) description!: string
+  @Prop({ default: false }) open!: boolean
+
+  @Prop({ default: () => [] }) additional!: {
+    name: string
+    handler: () => void
+  }[]
+
+  @Ref() context!: ContextMenu
+
+  isOpen = false
+  isList = false
+
+  list: ILibraryEntry[] = this.entries.map((el) => ({
+    originalEntry: el,
+    entry: [el],
+    reading: [],
+    translation: [],
+    type: this.type,
+  }))
+
+  perPage = 5
+
+  selected: string[] = []
+  srsLevel: {
+    [entry: string]: number
+  } = {}
+
+  readonly tagClassMap = [
+    (lv: number) => (lv > 2 ? 'is-success' : ''),
+    (lv: number) => (lv > 0 ? 'is-warning' : ''),
+    (lv: number) => (lv === 0 ? 'is-danger' : ''),
+  ]
+
+  async reload(entries: string[]) {
+    if (!this.isOpen) {
+      return
+    }
+
+    if (entries.length > 0) {
+      entries = [...new Set(entries)]
+
+      const { result } = await api.quiz_getSrsLevel({
+        entries,
+        type: this.type,
+      })
+
+      entries.map((entry) => {
+        delete this.srsLevel[entry]
+      })
+
+      result.map(({ entry, srsLevel }) => {
+        this.srsLevel[entry] = srsLevel
+      })
+
+      this.$set(this, 'srsLevel', this.srsLevel)
+      this.$forceUpdate()
+    }
+  }
+
+  async makeList(p = 1) {
+    const offset = (p - 1) * this.perPage
+
+    const listMap = new Map<number, ILibraryEntry>()
+    Array(this.perPage)
+      .fill(null)
+      .map((_, i) => {
+        const el = this.list[offset + i]
+        if (el && !el.reading.length) {
+          listMap.set(offset + i, el)
+        }
+      })
+
+    await Promise.all(
+      [...listMap].map(([k, v]) =>
+        api
+          .all_getLookup({
+            entry: v.originalEntry,
+            type: this.type,
+            forced: true,
+            limit: 1,
+          })
+          .then((r) =>
+            listMap.set(k, {
+              ...r.result[0]!,
+              ...v,
+            })
+          )
+      )
+    )
+
+    for (const [k, v] of listMap) {
+      this.list = [...this.list.slice(0, k), v, ...this.list.slice(k + 1)]
+    }
+
+    await this.reload([...listMap].flatMap(([, { entry }]) => entry))
+  }
+
+  getTagClass(it: IEntry) {
+    const srsLevel = Math.min(
+      ...it.entry.map((el) => this.srsLevel[el] || -Infinity)
+    )
+
+    if (srsLevel === -Infinity) return 'is-light'
+
+    if (srsLevel === -1) {
+      return 'is-info'
+    }
+
+    for (const fn of this.tagClassMap) {
+      const c = fn(srsLevel)
+      if (c) {
+        return c
+      }
+    }
+
+    return 'is-light'
+  }
+}
+</script>
+
+<style lang="scss" scoped>
+.tag {
+  margin-right: 0.5rem;
+  margin-bottom: 0.5rem;
+}
+
+.card-content[data-mode='item'] {
+  max-height: 400px;
+  overflow: scroll;
+}
+
+.has-context:hover {
+  color: blue;
+  cursor: pointer;
+}
+</style>
diff --git a/components/tabs/BrowseTab.vue b/components/tabs/BrowseTab.vue
index 78a1e09..110e335 100644
--- a/components/tabs/BrowseTab.vue
+++ b/components/tabs/BrowseTab.vue
@@ -257,7 +257,7 @@ export default class BrowseTab extends Vue {
         this.selected.reading = [
           await api
             .all_getReading({
-              entry: this.selected.entry[0],
+              entry: this.selected.entry[0]!,
             })
             .then((r) => r.result),
         ]
@@ -266,7 +266,7 @@ export default class BrowseTab extends Vue {
       if (!this.selected.translation.length) {
         this.selected.translation = await api
           .all_getMeaning({
-            entry: this.selected.entry[0],
+            entry: this.selected.entry[0]!,
           })
           .then((r) =>
             r.result.filter((r0) => !r0.entry).map((r0) => r0.meaning)
@@ -360,7 +360,7 @@ export default class BrowseTab extends Vue {
     const o = jsonClone(row)
     this.selected = {
       ...o,
-      entry: o.entry[0],
+      entry: o.entry[0]!,
       list: o.entry,
     }
     this.context.open(evt)
diff --git a/components/tabs/CharacterTab.vue b/components/tabs/CharacterTab.vue
index 02f539b..96f4109 100644
--- a/components/tabs/CharacterTab.vue
+++ b/components/tabs/CharacterTab.vue
@@ -1,6 +1,6 @@
 <template>
   <section>
-    <div class="HanziPage">
+    <div class="CharacterTab">
       <form class="field" @submit.prevent="q = q0">
         <label for="q" class="label">
           Search
@@ -29,7 +29,7 @@
       <div class="columns">
         <div class="column is-6 entry-display">
           <div
-            class="hanzi-display clickable font-han"
+            class="character-display clickable font-han"
             @click="(evt) => openContext(evt, current, 'character')"
             @contextmenu.prevent="
               (evt) => openContext(evt, current, 'character')
@@ -278,12 +278,14 @@ import { Component, Prop, Ref, Vue, Watch } from 'nuxt-property-decorator'
 import ContextMenu from '@/components/ContextMenu.vue'
 import { api, IEntry } from '~/assets/api'
 
+const TITLE = 'Kanji'
+
 @Component<CharacterTab>({
   components: {
     ContextMenu,
   },
   async created() {
-    this.$emit('title', 'Hanzi')
+    this.$emit('title', TITLE)
 
     this.q = this.query.q || ''
 
@@ -357,7 +359,7 @@ export default class CharacterTab extends Vue {
 
   @Watch('q')
   async onQChange(q: string) {
-    this.$emit('title', (q ? q + ' - ' : '') + 'Hanzi')
+    this.$emit('title', (q ? q + ' - ' : '') + TITLE)
 
     if (/\p{sc=Han}/u.test(q)) {
       const qs = q.split('').filter((h) => /\p{sc=Han}/u.test(h))
@@ -381,7 +383,7 @@ export default class CharacterTab extends Vue {
   @Watch('current')
   load() {
     if (this.current) {
-      this.loadHanzi()
+      this.loadCharacter()
       this.loadVocab()
       this.loadSentences()
     } else {
@@ -399,7 +401,7 @@ export default class CharacterTab extends Vue {
     }
   }
 
-  async loadHanzi() {
+  async loadCharacter() {
     if (!/^\p{sc=Han}$/u.test(this.current)) {
       this.sub = []
       this.sup = []
@@ -429,6 +431,7 @@ export default class CharacterTab extends Vue {
         } = await api.all_getLookup({
           entry: this.current,
           type: 'character',
+          limit: 1,
         })
 
         this.reading = r?.reading || []
@@ -455,10 +458,9 @@ export default class CharacterTab extends Vue {
         .map((r) =>
           api
             .all_getLookup({ entry: r.entry, type: 'vocabulary', limit: 1 })
-            .then((r) => r.result[0])
+            .then((r) => r.result[0]!)
         )
         .filter((r) => r)
-        .map((r) => r!)
     )
   }
 
@@ -478,10 +480,9 @@ export default class CharacterTab extends Vue {
         .map((r) =>
           api
             .all_getLookup({ entry: r.entry, type: 'sentence', limit: 1 })
-            .then((r) => r.result[0])
+            .then((r) => r.result[0]!)
         )
         .filter((r) => r)
-        .map((r) => r!)
     )
   }
 }
diff --git a/components/tabs/LibraryTab.vue b/components/tabs/LibraryTab.vue
new file mode 100644
index 0000000..9ae839f
--- /dev/null
+++ b/components/tabs/LibraryTab.vue
@@ -0,0 +1,285 @@
+<template>
+  <section>
+    <div class="LibraryPage">
+      <form @submit.prevent="q = q0">
+        <label for="q" class="label">
+          Search
+          <b-tooltip label="How to?" position="is-right">
+            <a
+              href="https://github.com/zhquiz/zhquiz/wiki/How-to-search-or-filter"
+              target="_blank"
+              rel="noopener noreferrer"
+            >
+              <b-icon icon="info-circle"></b-icon>
+            </a>
+          </b-tooltip>
+        </label>
+        <div class="field has-addons">
+          <p class="control is-expanded">
+            <input
+              v-model="q0"
+              class="input"
+              type="search"
+              name="q"
+              placeholder="Type here to search"
+              aria-label="search"
+            />
+          </p>
+          <p class="control">
+            <button
+              class="button is-success"
+              type="button"
+              @click="openEditModal()"
+            >
+              Add new item
+            </button>
+          </p>
+        </div>
+      </form>
+
+      <div class="columns mt-4">
+        <div class="column">
+          <section class="card">
+            <div class="card-content">
+              <LibraryCard
+                v-for="(it, i) in local.result"
+                :id="it.id"
+                :key="i"
+                :title="it.title"
+                :entries="it.entries"
+                :type="it.type"
+                :description="it.description"
+                :additional="additionalContext(it)"
+              />
+
+              <b-pagination
+                v-if="local.count > local.perPage"
+                v-model="local.page"
+                :total="local.count"
+                :per-page="local.perPage"
+                icon-prev="angle-left"
+                icon-next="angle-right"
+                @change="(p) => (local.page = p)"
+              />
+            </div>
+          </section>
+        </div>
+      </div>
+    </div>
+
+    <b-modal v-model="isEditModal">
+      <div class="card">
+        <header class="card-header">
+          <div v-if="!edited.id" class="card-header-title">New list</div>
+          <div v-else class="card-header-title">Edit list</div>
+        </header>
+        <div class="card-content">
+          <b-field label="Title">
+            <b-input
+              v-model="edited.title"
+              placeholder="Must not be empty"
+            ></b-input>
+          </b-field>
+          <b-field label="Entries">
+            <template slot="label">
+              Entries
+              <b-tooltip type="is-dark" label="Space or new-line separated">
+                <b-icon size="is-small" icon="info-circle"></b-icon>
+              </b-tooltip>
+            </template>
+            <b-input
+              v-model="entryString"
+              type="textarea"
+              placeholder="Space or new-line separated, must not be empty"
+            ></b-input>
+          </b-field>
+          <b-field label="Description">
+            <b-input v-model="edited.description" type="textarea"></b-input>
+          </b-field>
+          <b-field label="Tag">
+            <b-taginput v-model="edited.tag"></b-taginput>
+          </b-field>
+          <b-field label="Additional options">
+            <b-checkbox
+              :value="edited.isShared"
+              @input="(ev) => $set(edited, 'isShared', ev)"
+            >
+              Make it availble for others (shared library)
+            </b-checkbox>
+          </b-field>
+        </div>
+        <footer class="card-footer">
+          <div class="card-footer-item">
+            <button
+              class="button is-success"
+              type="button"
+              @click="edited.id ? doUpdate() : doCreate()"
+            >
+              Save
+            </button>
+            <button
+              class="button is-cancel"
+              type="button"
+              @click="isEditModal = false"
+            >
+              Cancel
+            </button>
+          </div>
+        </footer>
+      </div>
+    </b-modal>
+  </section>
+</template>
+
+<script lang="ts">
+import { Component, Vue, Watch } from 'nuxt-property-decorator'
+import { api, ILibrary } from '~/assets/api'
+import LibraryCard from '../cards/LibraryCard.vue'
+
+@Component<LibraryTab>({
+  components: {
+    LibraryCard,
+  },
+  created() {
+    this.$emit('title', 'Library')
+    this.updateLocal()
+  },
+})
+export default class LibraryTab extends Vue {
+  q = ''
+  q0 = ''
+  isEditModal = false
+
+  local: {
+    result: ILibrary[]
+    count: number
+    page: number
+    perPage: number
+  } = {
+    result: [],
+    count: 0,
+    page: 1,
+    perPage: 10,
+  }
+
+  edited: ILibrary = {
+    id: '',
+    title: '',
+    list: [],
+    type: 'vocabulary',
+    description: '',
+    tag: [],
+  }
+
+  get entryString() {
+    return this.edited.list.join('\n')
+  }
+
+  set entryString(s) {
+    this.edited.list = s
+      .split('\n')
+      .filter((s) => s.trim())
+      .filter((a, i, r) => r.indexOf(a) === i)
+  }
+
+  additionalContext(it: ILibrary) {
+    if (!it.id) {
+      return []
+    }
+
+    return [
+      {
+        name: 'Edit list',
+        handler: () => {
+          this.openEditModal()
+        },
+      },
+      {
+        name: 'Delete list',
+        handler: () => {
+          if (it.id) {
+            this.doDelete(it.id)
+          }
+        },
+      },
+    ]
+  }
+
+  openEditModal(it?: ILibrary) {
+    this.edited = it || {
+      id: '',
+      title: '',
+      list: [],
+      type: 'vocabulary',
+      description: '',
+      tag: [],
+    }
+
+    this.isEditModal = true
+  }
+
+  @Watch('q')
+  @Watch('local.page')
+  async updateLocal() {
+    const r = await api.library_getQuery({
+      q: this.q,
+      offset: this.local.page * this.local.perPage,
+      limit: this.local.perPage,
+    })
+
+    this.local = {
+      ...this.local,
+      ...r,
+      result: r.result,
+    }
+  }
+
+  async doCreate() {
+    await api.library_create(this.edited)
+
+    this.$buefy.snackbar.open(`Created list: ${this.edited.title}`)
+    this.isEditModal = false
+
+    this.local.page = 1
+    await this.updateLocal()
+  }
+
+  async doUpdate() {
+    const { id } = this.edited
+
+    if (id) {
+      await api.library_update(this.edited)
+
+      this.$buefy.snackbar.open(`Updated list: ${this.edited.title}`)
+    }
+
+    this.isEditModal = false
+
+    this.local.page = 1
+    await this.updateLocal()
+  }
+
+  async doDelete(id: string) {
+    await api.library_delete({ id })
+
+    this.$buefy.snackbar.open(`Deleted list: ${this.edited.title}`)
+
+    this.local.page = 1
+    await this.updateLocal()
+  }
+}
+</script>
+
+<style scoped>
+nav.pagination {
+  margin-top: 1rem;
+}
+
+.button + .button {
+  margin-left: 1rem;
+}
+
+.button.is-cancel {
+  background-color: rgb(215, 217, 219);
+}
+</style>
diff --git a/tsconfig.base.json b/tsconfig.base.json
new file mode 100644
index 0000000..afb6c89
--- /dev/null
+++ b/tsconfig.base.json
@@ -0,0 +1,71 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                         /* Enable incremental compilation */
+    // "target": "es5",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    // "module": "commonjs",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                                   /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                             /* Allow javascript files to be compiled. */
+    // "checkJs": true,                             /* Report errors in .js files. */
+    // "jsx": "preserve",                           /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */
+    // "declaration": true,                         /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                      /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                           /* Generates corresponding '.map' file. */
+    // "outFile": "./",                             /* Concatenate and emit output to single file. */
+    // "outDir": "./",                              /* Redirect output structure to the directory. */
+    // "rootDir": "./",                             /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                           /* Enable project compilation */
+    // "tsBuildInfoFile": "./",                     /* Specify file to store incremental compilation information */
+    // "removeComments": true,                      /* Do not emit comments to output. */
+    // "noEmit": true,                              /* Do not emit outputs. */
+    // "importHelpers": true,                       /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,                  /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,                     /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                                 /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                       /* Raise error on expressions and declarations with an implied 'any' type. */
+    "strictNullChecks": true,                    /* Enable strict null checks. */
+    "strictFunctionTypes": true,                 /* Enable strict checking of function types. */
+    "strictBindCallApply": true,                 /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    "strictPropertyInitialization": true,        /* Enable strict checking of property initialization in classes. */
+    "noImplicitThis": true,                      /* Raise error on 'this' expressions with an implied 'any' type. */
+    "alwaysStrict": true,                        /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    "noUnusedLocals": true,                      /* Report errors on unused locals. */
+    "noUnusedParameters": true,                  /* Report errors on unused parameters. */
+    "noImplicitReturns": true,                   /* Report error when not all code paths in function return a value. */
+    "noFallthroughCasesInSwitch": true,          /* Report errors for fallthrough cases in switch statement. */
+    "noUncheckedIndexedAccess": true,            /* Include 'undefined' in index signature results */
+    "noPropertyAccessFromIndexSignature": true,  /* Require undeclared properties from index signatures to use element accesses. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",                  /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                             /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                                 /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                              /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                             /* List of folders to include type definitions from. */
+    // "types": [],                                 /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,        /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                        /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,                    /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,                /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                            /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                               /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,                     /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                       /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,              /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,               /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
index 86bb182..1ed71ec 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,4 +1,5 @@
 {
+  "extends": "./tsconfig.base.json",
   "compilerOptions": {
     "target": "ES2018",
     "module": "ESNext",