diff --git a/.changeset/curvy-pears-cheat.md b/.changeset/curvy-pears-cheat.md
new file mode 100644
index 0000000000..8633e6a01a
--- /dev/null
+++ b/.changeset/curvy-pears-cheat.md
@@ -0,0 +1,5 @@
+---
+'xstate': patch
+---
+
+Fixed a type compatibility with Svelte's readables. It should be possible again to use XState interpreters directly as readables at the type-level.
diff --git a/.github/actions/ci-checks/action.yml b/.github/actions/ci-checks/action.yml
new file mode 100644
index 0000000000..47386e8e15
--- /dev/null
+++ b/.github/actions/ci-checks/action.yml
@@ -0,0 +1,15 @@
+name: 'CI checks'
+runs:
+  using: 'composite'
+  steps:
+    - name: Build
+      run: yarn build
+      shell: bash
+
+    - name: Test
+      run: yarn test --silent
+      shell: bash
+
+    - name: Svelte Check
+      run: yarn --cwd packages/xstate-svelte svelte-check
+      shell: bash
diff --git a/.github/actions/ci-setup/action.yml b/.github/actions/ci-setup/action.yml
new file mode 100644
index 0000000000..b5544914d9
--- /dev/null
+++ b/.github/actions/ci-setup/action.yml
@@ -0,0 +1,12 @@
+name: 'CI setup'
+runs:
+  using: 'composite'
+  steps:
+    - name: Use Node.js 14.x
+      uses: actions/setup-node@v2
+      with:
+        node-version: 14.x
+
+    - name: Install Dependencies
+      run: yarn
+      shell: bash
diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index c11ff34ef3..83a7f4a057 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -8,23 +8,7 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        node-version: [14.x]
-
     steps:
       - uses: actions/checkout@v2
-
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v2
-        with:
-          node-version: ${{ matrix.node-version }}
-
-      - name: Install dependencies
-        run: yarn install
-
-      - name: Build
-        run: yarn build
-
-      - name: Test
-        run: yarn test --silent
+      - uses: ./.github/actions/ci-setup
+      - uses: ./.github/actions/ci-checks
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 3625be78e9..b2602cbaa4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -15,17 +15,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-        with:
-          # This makes action fetch all Git history so that Changesets can generate changelogs with the correct commits
-          fetch-depth: 0
-
-      - name: Use Node.js 14.x
-        uses: actions/setup-node@v2
-        with:
-          node-version: 14.x
-
-      - name: Install Dependencies
-        run: yarn
+      - uses: ./.github/actions/ci-setup
+      - uses: ./.github/actions/ci-checks
 
       - name: Create Release Pull Request or Publish to npm
         uses: changesets/action@v1
diff --git a/package.json b/package.json
index de2d9567f9..0a5cbf7a10 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,7 @@
     "test": "jest",
     "test:core": "npm test --prefix packages/core",
     "dev": "node ./scripts/dev.js",
-    "ci": "npm run build && npm run test",
     "changeset": "changeset",
-    "prerelease": "npm run build && npm run test",
     "release": "changeset publish",
     "version": "changeset version && node ./scripts/bump-peer-dep-ranges.js"
   },
diff --git a/packages/core/rollup.config.js b/packages/core/rollup.config.js
index 0004fee07f..dfc1062b5b 100644
--- a/packages/core/rollup.config.js
+++ b/packages/core/rollup.config.js
@@ -4,33 +4,6 @@ import { terser } from 'rollup-plugin-terser';
 import rollupReplace from 'rollup-plugin-replace';
 import fileSize from 'rollup-plugin-filesize';
 
-const stripSymbolObservableMethodPlugin = ({ types: t }) => {
-  const isSymbolObservable = t.buildMatchMemberExpression('Symbol.observable');
-  return {
-    visitor: {
-      MemberExpression(path) {
-        if (!isSymbolObservable(path.node)) {
-          return;
-        }
-        // class Interpreter { [Symbol.observable]() {} }
-        if (path.parentPath.isClassMethod()) {
-          path.parentPath.remove();
-          return;
-        }
-        // Interpreter.prototype[Symbol.observable] = function() {}
-        if (
-          path.parentPath.isMemberExpression() &&
-          path.parentPath.get('property') === path &&
-          path.parentPath.parentPath.isAssignmentExpression()
-        ) {
-          path.parentPath.parentPath.remove();
-          return;
-        }
-      }
-    }
-  };
-};
-
 const createTsPlugin = ({ declaration = true, target } = {}) =>
   typescript({
     clean: true,
@@ -49,10 +22,7 @@ const createBabelPlugin = () =>
     skipPreflightCheck: true,
     babelHelpers: 'inline',
     extensions: ['.ts', '.tsx', '.js'],
-    plugins: [
-      'babel-plugin-annotate-pure-calls',
-      stripSymbolObservableMethodPlugin
-    ]
+    plugins: ['babel-plugin-annotate-pure-calls']
   });
 
 const createNpmConfig = ({ input, output }) => ({
diff --git a/packages/core/src/Actor.ts b/packages/core/src/Actor.ts
index 7e490c1a2e..35e1c22374 100644
--- a/packages/core/src/Actor.ts
+++ b/packages/core/src/Actor.ts
@@ -9,7 +9,12 @@ import {
   ActorRef,
   BaseActorRef
 } from './types';
-import { interopSymbols, isMachine, mapContext, toInvokeSource } from './utils';
+import {
+  symbolObservableRef,
+  isMachine,
+  mapContext,
+  toInvokeSource
+} from './utils';
 import * as serviceScope from './serviceScope';
 
 export interface Actor<
@@ -38,7 +43,9 @@ export function createNullActor(id: string): ActorRef<any> {
     toJSON: () => ({
       id
     }),
-    ...interopSymbols
+    [symbolObservableRef.symbol]: function () {
+      return this;
+    }
   };
 }
 
@@ -107,16 +114,21 @@ export function isSpawnedActor(item: any): item is ActorRef<any> {
   return isActor(item) && 'id' in item;
 }
 
+// TODO: refactor the return type, this could be written in a better way but it's best to avoid unneccessary breaking changes now
 export function toActorRef<
   TEvent extends EventObject,
   TEmitted = any,
   TActorRefLike extends BaseActorRef<TEvent> = BaseActorRef<TEvent>
->(actorRefLike: TActorRefLike): ActorRef<TEvent, TEmitted> {
+>(
+  actorRefLike: TActorRefLike
+): ActorRef<TEvent, TEmitted> & Omit<TActorRefLike, keyof ActorRef<any, any>> {
   return {
     subscribe: () => ({ unsubscribe: () => void 0 }),
     id: 'anonymous',
     getSnapshot: () => undefined,
-    ...interopSymbols,
+    [symbolObservableRef.symbol]: function () {
+      return this;
+    },
     ...actorRefLike
   };
 }
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index a53d909ed0..4c2dd665a5 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -3,7 +3,7 @@ import { mapState } from './mapState';
 import { StateNode } from './StateNode';
 import { State } from './State';
 import { Machine, createMachine } from './Machine';
-import { Actor } from './Actor';
+import { Actor, toActorRef } from './Actor';
 import * as actions from './actions';
 import {
   interpret,
@@ -18,6 +18,7 @@ const { assign, send, sendParent, sendUpdate, forwardTo, doneInvoke } = actions;
 
 export {
   Actor,
+  toActorRef,
   Machine,
   StateNode,
   State,
diff --git a/packages/core/src/interpreter.ts b/packages/core/src/interpreter.ts
index 60ecaa44e4..68b8e1adc4 100644
--- a/packages/core/src/interpreter.ts
+++ b/packages/core/src/interpreter.ts
@@ -33,7 +33,8 @@ import {
   StopActionObject,
   Subscription,
   AnyState,
-  StateConfig
+  StateConfig,
+  InteropSubscribable
 } from './types';
 import { State, bindActionToState, isStateConfig } from './State';
 import * as actionTypes from './actionTypes';
@@ -53,12 +54,11 @@ import {
   toEventObject,
   toSCXMLEvent,
   reportUnhandledExceptionOnInvocation,
-  symbolObservable,
   toInvokeSource,
   toObserver,
   isActor,
   isBehavior,
-  interopSymbols
+  symbolObservableRef
 } from './utils';
 import { Scheduler } from './scheduler';
 import { Actor, isSpawnedActor, createDeferredActor } from './Actor';
@@ -388,6 +388,11 @@ export class Interpreter<
 
     return this;
   }
+  public subscribe(
+    observer: Observer<
+      State<TContext, TEvent, any, TTypestate, TResolvedTypesMeta>
+    >
+  ): Subscription;
   public subscribe(
     nextListener?: (
       state: State<TContext, TEvent, any, TTypestate, TResolvedTypesMeta>
@@ -395,11 +400,6 @@ export class Interpreter<
     errorListener?: (error: any) => void,
     completeListener?: () => void
   ): Subscription;
-  public subscribe(
-    observer: Observer<
-      State<TContext, TEvent, any, TTypestate, TResolvedTypesMeta>
-    >
-  ): Subscription;
   public subscribe(
     nextListenerOrObserver?:
       | ((
@@ -1166,7 +1166,9 @@ export class Interpreter<
         return { id };
       },
       getSnapshot: () => resolvedData,
-      ...interopSymbols
+      [symbolObservableRef.symbol]: function () {
+        return this;
+      }
     };
 
     this.children.set(id, actor);
@@ -1208,11 +1210,12 @@ export class Interpreter<
       id,
       send: (event) => receivers.forEach((receiver) => receiver(event)),
       subscribe: (next) => {
-        listeners.add(next);
+        const observer = toObserver(next);
+        listeners.add(observer.next);
 
         return {
           unsubscribe: () => {
-            listeners.delete(next);
+            listeners.delete(observer.next);
           }
         };
       },
@@ -1226,7 +1229,9 @@ export class Interpreter<
         return { id };
       },
       getSnapshot: () => emitted,
-      ...interopSymbols
+      [symbolObservableRef.symbol]: function () {
+        return this;
+      }
     };
 
     this.children.set(id, actor);
@@ -1265,7 +1270,9 @@ export class Interpreter<
       toJSON() {
         return { id };
       },
-      ...interopSymbols
+      [symbolObservableRef.symbol]: function () {
+        return this;
+      }
     };
 
     this.children.set(id, actor);
@@ -1310,7 +1317,9 @@ export class Interpreter<
       toJSON() {
         return { id };
       },
-      ...interopSymbols
+      [symbolObservableRef.symbol]: function () {
+        return this;
+      }
     });
   }
 
@@ -1357,15 +1366,7 @@ export class Interpreter<
     };
   }
 
-  public [symbolObservable](): Subscribable<
-    State<TContext, TEvent, TStateSchema, TTypestate, TResolvedTypesMeta>
-  > {
-    return this;
-  }
-
-  // this gets stripped by Babel to avoid having "undefined" property in environments without this non-standard Symbol
-  // it has to be here to be included in the generated .d.ts
-  public [Symbol.observable](): Subscribable<
+  public [symbolObservableRef.symbol](): InteropSubscribable<
     State<TContext, TEvent, TStateSchema, TTypestate, TResolvedTypesMeta>
   > {
     return this;
diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index ef131d79f4..dda1d56cfb 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -1603,16 +1603,20 @@ export interface Subscription {
 }
 
 export interface InteropObservable<T> {
-  [Symbol.observable]: () => Subscribable<T>;
+  [Symbol.observable]: () => InteropSubscribable<T>;
 }
 
-export interface Subscribable<T> {
+export interface InteropSubscribable<T> {
+  subscribe(observer: Observer<T>): Subscription;
+}
+
+export interface Subscribable<T> extends InteropSubscribable<T> {
+  subscribe(observer: Observer<T>): Subscription;
   subscribe(
     next: (value: T) => void,
     error?: (error: any) => void,
     complete?: () => void
   ): Subscription;
-  subscribe(observer: Observer<T>): Subscription;
 }
 
 export type Spawnable =
diff --git a/packages/core/src/utils.ts b/packages/core/src/utils.ts
index e6eb1eead5..5f4d7277a8 100644
--- a/packages/core/src/utils.ts
+++ b/packages/core/src/utils.ts
@@ -529,15 +529,18 @@ export function isObservable<T>(value: any): value is Subscribable<T> {
   }
 }
 
-export const symbolObservable = (() =>
+const symbolObservable = (() =>
   (typeof Symbol === 'function' && Symbol.observable) || '@@observable')();
 
+export const symbolObservableRef = {
+  symbol: symbolObservable as Exclude<typeof symbolObservable, string>
+} as const;
+
+// TODO: to be removed in v5, left it out just to minimize the scope of the change and maintain compatibility with older versions of integration paackages
 export const interopSymbols = {
-  [symbolObservable]: function () {
+  [symbolObservableRef.symbol]: function () {
     return this;
   },
-  // this gets stripped by Babel to avoid having "undefined" property in environments without this non-standard Symbol
-  // it has to be here to be included in the generated .d.ts
   [Symbol.observable]: function () {
     return this;
   }
diff --git a/packages/core/test/types.test.ts b/packages/core/test/types.test.ts
index 2e23fcd545..8cb2d6e468 100644
--- a/packages/core/test/types.test.ts
+++ b/packages/core/test/types.test.ts
@@ -1,3 +1,4 @@
+import { from } from 'rxjs';
 import { Machine, assign, createMachine, interpret } from '../src/index';
 import { raise } from '../src/actions';
 
@@ -386,3 +387,23 @@ describe('Typestates', () => {
     expect(failed).toEqual({ result: none, error: 'oops' });
   });
 });
+
+describe('interpreter', () => {
+  it('should be convertable to Rx observable', () => {
+    const state$ = from(
+      interpret(
+        createMachine({
+          schema: {
+            context: {} as { count: number }
+          }
+        })
+      )
+    );
+
+    state$.subscribe((state) => {
+      ((_val: number) => {})(state.context.count);
+      // @ts-expect-error
+      ((_val: string) => {})(state.context.count);
+    });
+  });
+});
diff --git a/packages/xstate-inspect/src/browser.ts b/packages/xstate-inspect/src/browser.ts
index 584c2e635f..802faa0279 100644
--- a/packages/xstate-inspect/src/browser.ts
+++ b/packages/xstate-inspect/src/browser.ts
@@ -4,15 +4,11 @@ import {
   interpret,
   EventObject,
   EventData,
-  Observer
+  Observer,
+  toActorRef
 } from 'xstate';
 import { XStateDevInterface } from 'xstate/lib/devTools';
-import {
-  toSCXMLEvent,
-  toEventObject,
-  toObserver,
-  interopSymbols
-} from 'xstate/lib/utils';
+import { toSCXMLEvent, toEventObject, toObserver } from 'xstate/lib/utils';
 import { createInspectMachine, InspectMachineEvent } from './inspectMachine';
 import { stringifyMachine, stringifyState } from './serialize';
 import type {
@@ -259,7 +255,7 @@ export function createWindowReceiver(
 
   ownWindow.addEventListener('message', handler);
 
-  const actorRef: InspectReceiver = {
+  const actorRef: InspectReceiver = toActorRef({
     id: 'xstate.windowReceiver',
 
     send(event) {
@@ -286,9 +282,8 @@ export function createWindowReceiver(
     },
     getSnapshot() {
       return latestEvent;
-    },
-    ...interopSymbols
-  };
+    }
+  });
 
   actorRef.send({
     type: 'xstate.inspecting'
@@ -305,7 +300,7 @@ export function createWebSocketReceiver(
   const observers = new Set<Observer<ParsedReceiverEvent>>();
   let latestEvent: ParsedReceiverEvent;
 
-  const actorRef: InspectReceiver = {
+  const actorRef: InspectReceiver = toActorRef({
     id: 'xstate.webSocketReceiver',
     send(event) {
       ws.send(stringify(event, options.serialize));
@@ -323,9 +318,8 @@ export function createWebSocketReceiver(
     },
     getSnapshot() {
       return latestEvent;
-    },
-    ...interopSymbols
-  };
+    }
+  });
 
   ws.onopen = () => {
     actorRef.send({
diff --git a/packages/xstate-inspect/src/server.ts b/packages/xstate-inspect/src/server.ts
index 412c6e42b5..fb4d00edeb 100644
--- a/packages/xstate-inspect/src/server.ts
+++ b/packages/xstate-inspect/src/server.ts
@@ -4,11 +4,12 @@ import {
   EventData,
   EventObject,
   interpret,
-  Interpreter
+  Interpreter,
+  toActorRef
 } from 'xstate';
-import { toEventObject, toSCXMLEvent, interopSymbols } from 'xstate/lib/utils';
+import { toEventObject, toSCXMLEvent } from 'xstate/lib/utils';
 
-import { createInspectMachine } from './inspectMachine';
+import { createInspectMachine, InspectMachineEvent } from './inspectMachine';
 import { Inspector, Replacer } from './types';
 import { stringify } from './utils';
 
@@ -53,8 +54,7 @@ export function inspect(options: ServerInspectorOptions): Inspector {
   const inspectService = interpret(
     createInspectMachine(globalThis.__xstate__, options)
   ).start();
-  let client: ActorRef<any, undefined> = {
-    ...interopSymbols,
+  let client: ActorRef<any, undefined> = toActorRef({
     id: '@@xstate/ws-client',
     send: (event: any) => {
       server.clients.forEach((wsClient) => {
@@ -67,7 +67,7 @@ export function inspect(options: ServerInspectorOptions): Inspector {
       return { unsubscribe: () => void 0 };
     },
     getSnapshot: () => undefined
-  };
+  });
 
   server.on('connection', function connection(wsClient) {
     wsClient.on('message', function incoming(data, isBinary) {
@@ -134,10 +134,9 @@ export function inspect(options: ServerInspectorOptions): Inspector {
     });
   });
 
-  const inspector: Inspector = {
-    ...interopSymbols,
+  const inspector: Inspector = toActorRef({
     id: '@@xstate/inspector',
-    send: (event) => {
+    send: (event: InspectMachineEvent) => {
       inspectService.send(event);
     },
     subscribe: () => {
@@ -150,7 +149,7 @@ export function inspect(options: ServerInspectorOptions): Inspector {
       inspectService.stop();
     },
     getSnapshot: () => undefined
-  };
+  });
 
   server.on('close', () => {
     inspectService.stop();
diff --git a/packages/xstate-react/test/useActor.test.tsx b/packages/xstate-react/test/useActor.test.tsx
index 9efcb749be..a40bfccb23 100644
--- a/packages/xstate-react/test/useActor.test.tsx
+++ b/packages/xstate-react/test/useActor.test.tsx
@@ -7,9 +7,9 @@ import {
   spawn,
   ActorRef,
   ActorRefFrom,
-  interpret
+  interpret,
+  toActorRef
 } from 'xstate';
-import { toActorRef } from 'xstate/lib/Actor';
 import { render, cleanup, fireEvent, act } from '@testing-library/react';
 import { useActor } from '../src/useActor';
 import { useState } from 'react';
diff --git a/packages/xstate-react/test/useSelector.test.tsx b/packages/xstate-react/test/useSelector.test.tsx
index cc031507ae..e10a29f1f5 100644
--- a/packages/xstate-react/test/useSelector.test.tsx
+++ b/packages/xstate-react/test/useSelector.test.tsx
@@ -1,6 +1,5 @@
 import * as React from 'react';
-import { assign, createMachine, interpret, spawn } from 'xstate';
-import { toActorRef } from 'xstate/lib/Actor';
+import { assign, createMachine, interpret, spawn, toActorRef } from 'xstate';
 import { act, render, cleanup, fireEvent } from '@testing-library/react';
 import { useInterpret, useMachine, useSelector } from '../src';
 
diff --git a/packages/xstate-svelte/package.json b/packages/xstate-svelte/package.json
index b1fbfb66a3..d349879cf3 100644
--- a/packages/xstate-svelte/package.json
+++ b/packages/xstate-svelte/package.json
@@ -34,7 +34,8 @@
     "clean": "rm -rf dist lib tsconfig.tsbuildinfo",
     "build": "tsc",
     "test": "jest",
-    "prepare": "npm run build"
+    "prepare": "npm run build",
+    "svelte-check": "svelte-check"
   },
   "bugs": {
     "url": "https://github.com/statelyai/xstate/issues"
@@ -60,6 +61,7 @@
     "jest": "^26.6.3",
     "lerna-alias": "3.0.3-0",
     "svelte": "^3.24.1",
+    "svelte-check": "^2.4.5",
     "svelte-jester": "^1.1.2",
     "svelte-preprocess": "^4.0.10",
     "ts-jest": "^26.5.6",
diff --git a/packages/xstate-svelte/test/interpreterAsReadable.svelte b/packages/xstate-svelte/test/interpreterAsReadable.svelte
new file mode 100644
index 0000000000..bfadbd214e
--- /dev/null
+++ b/packages/xstate-svelte/test/interpreterAsReadable.svelte
@@ -0,0 +1,19 @@
+<script lang="ts">
+  // this file acts as a type test
+  import { createMachine, interpret } from 'xstate';
+
+  const service = interpret(
+    createMachine({
+      schema: {
+        context: {} as { count: number }
+      }
+    })
+  ).start();
+
+  const { count } = $service.context;
+  ((_val: number) => {})(count);
+  // @ts-expect-error
+  ((_val: string) => {})(count);
+</script>
+
+<div>$count</div>
diff --git a/yarn.lock b/yarn.lock
index 819c64613e..516f195321 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1566,6 +1566,14 @@ anymatch@^3.0.3, anymatch@~3.1.1:
     normalize-path "^3.0.0"
     picomatch "^2.0.4"
 
+anymatch@~3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-3.1.2.tgz#c0557c096af32f106198f4f4e2a383537e378716"
+  integrity sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==
+  dependencies:
+    normalize-path "^3.0.0"
+    picomatch "^2.0.4"
+
 argparse@^1.0.7:
   version "1.0.10"
   resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.10.tgz#bcd6791ea5ae09725e17e5ad988134cd40b3d911"
@@ -2061,6 +2069,11 @@ bser@2.1.1:
   dependencies:
     node-int64 "^0.4.0"
 
+buffer-crc32@^0.2.5:
+  version "0.2.13"
+  resolved "https://registry.yarnpkg.com/buffer-crc32/-/buffer-crc32-0.2.13.tgz#0d333e3f00eac50aa1454abd30ef8c2a5d9a7242"
+  integrity sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=
+
 buffer-from@1.x, buffer-from@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
@@ -2243,6 +2256,21 @@ chokidar@^3.4.0:
   optionalDependencies:
     fsevents "~2.1.2"
 
+chokidar@^3.4.1:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.5.3.tgz#1cf37c8707b932bd1af1ae22c0432e2acd1903bd"
+  integrity sha512-Dr3sfKRP6oTcjf2JmUmFJfeVMvXBdegxB0iVQ5eb2V10uFJUCAS8OByZdVAyVb8xXNz3GjjTgj9kLWsZTqE6kw==
+  dependencies:
+    anymatch "~3.1.2"
+    braces "~3.0.2"
+    glob-parent "~5.1.2"
+    is-binary-path "~2.1.0"
+    is-glob "~4.0.1"
+    normalize-path "~3.0.0"
+    readdirp "~3.6.0"
+  optionalDependencies:
+    fsevents "~2.3.2"
+
 ci-info@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
@@ -2933,6 +2961,11 @@ error-ex@^1.3.1:
   dependencies:
     is-arrayish "^0.2.1"
 
+es6-promise@^3.1.2:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-3.3.1.tgz#a08cdde84ccdbf34d027a1451bc91d4bcd28a613"
+  integrity sha1-oIzd6EzNvzTQJ6FFG8kdS80ophM=
+
 escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.4, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
@@ -3172,6 +3205,17 @@ fast-glob@^3.1.1:
     micromatch "^4.0.2"
     picomatch "^2.2.1"
 
+fast-glob@^3.2.7:
+  version "3.2.11"
+  resolved "https://registry.yarnpkg.com/fast-glob/-/fast-glob-3.2.11.tgz#a1172ad95ceb8a16e20caa5c5e56480e5129c1d9"
+  integrity sha512-xrO3+1bxSo3ZVHAnqzyuewYT6aMFHRAd4Kcs92MAonjwQZLsK9d0SF1IyQ3k5PoirxTW0Oe/RqFgMQ6TcNE5Ew==
+  dependencies:
+    "@nodelib/fs.stat" "^2.0.2"
+    "@nodelib/fs.walk" "^1.2.3"
+    glob-parent "^5.1.2"
+    merge2 "^1.3.0"
+    micromatch "^4.0.4"
+
 fast-json-stable-stringify@2.x, fast-json-stable-stringify@^2.0.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz#874bf69c6f404c2b5d99c481341399fd55892633"
@@ -3465,6 +3509,11 @@ fsevents@~2.1.2:
   resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.1.3.tgz#fb738703ae8d2f9fe900c33836ddebee8b97f23e"
   integrity sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==
 
+fsevents@~2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
+  integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
+
 function-bind@^1.1.1:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/function-bind/-/function-bind-1.1.1.tgz#a56899d3ea3c9bab874bb9773b7c5ede92f4895d"
@@ -3614,6 +3663,13 @@ glob-parent@^5.1.0, glob-parent@~5.1.0:
   dependencies:
     is-glob "^4.0.1"
 
+glob-parent@^5.1.2, glob-parent@~5.1.2:
+  version "5.1.2"
+  resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
+  integrity sha512-AOIgSQCepiJYwP3ARnGx+5VnTu2HBYdzbGP45eLw1vr3zB3vZLeyed1sC9hnbcOc9/SrMyM5RPQrkGz4aS9Zow==
+  dependencies:
+    is-glob "^4.0.1"
+
 glob-to-regexp@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/glob-to-regexp/-/glob-to-regexp-0.3.0.tgz#8c5a1494d2066c570cc3bfe4496175acc4d502ab"
@@ -3731,6 +3787,11 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.5, graceful-fs@^4.1.6,
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
 
+graceful-fs@^4.1.3:
+  version "4.2.9"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.9.tgz#041b05df45755e587a24942279b9d113146e1c96"
+  integrity sha512-NtNxqUcXgpW2iMrfqSfR73Glt39K+BLwWsPs94yR63v45T0Wbej7eRmL5cWfwEgqXnmjQp3zaJTshdRW/qC2ZQ==
+
 grapheme-splitter@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/grapheme-splitter/-/grapheme-splitter-1.0.4.tgz#9cf3a665c6247479896834af35cf1dbb4400767e"
@@ -4069,7 +4130,7 @@ import-fresh@^2.0.0:
     caller-path "^2.0.0"
     resolve-from "^3.0.0"
 
-import-fresh@^3.1.0:
+import-fresh@^3.1.0, import-fresh@^3.2.1:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/import-fresh/-/import-fresh-3.3.0.tgz#37162c25fcb9ebaa2e6e53d5b4d88ce17d9e0c2b"
   integrity sha512-veYYhQa+D1QBKznvhUHxb8faxlrwUnxseDAbAp457E0wLNio2bOSKnjYDhMj+YiAq61xrMGhQk9iXVk5FzgQMw==
@@ -5560,6 +5621,14 @@ micromatch@^4.0.2:
     braces "^3.0.1"
     picomatch "^2.0.5"
 
+micromatch@^4.0.4:
+  version "4.0.4"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.4.tgz#896d519dfe9db25fce94ceb7a500919bf881ebf9"
+  integrity sha512-pRmzw/XUcwXGpD9aI9q/0XOwLNygjETJ8y0ao0wdqprrzDa4YnxLcz7fQRZr8voh8V10kGhABbNcHVk5wHgWwg==
+  dependencies:
+    braces "^3.0.1"
+    picomatch "^2.2.3"
+
 mime-db@1.44.0:
   version "1.44.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.44.0.tgz#fa11c5eb0aca1334b4233cb4d52f10c5a6272f92"
@@ -5658,6 +5727,11 @@ mkdirp@1.x, mkdirp@~1.0.4:
   resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-1.0.4.tgz#3eb5ed62622756d79a5f0e2a221dfebad75c2f7e"
   integrity sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==
 
+mri@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/mri/-/mri-1.2.0.tgz#6721480fec2a11a4889861115a48b6cbe7cc8f0b"
+  integrity sha512-tzzskb3bG8LvYGFF/mDTpq3jpI6Q9wc3LEmBaghu+DdCssd1FakN7Bc0hVNmEyGq1bq3RgfkCb3cmQLpNPOroA==
+
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"
@@ -6223,11 +6297,21 @@ performance-now@^2.1.0:
   resolved "https://registry.yarnpkg.com/performance-now/-/performance-now-2.1.0.tgz#6309f4e0e5fa913ec1c69307ae364b4b377c9e7b"
   integrity sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=
 
+picocolors@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/picocolors/-/picocolors-1.0.0.tgz#cb5bdc74ff3f51892236eaf79d68bc44564ab81c"
+  integrity sha512-1fygroTLlHu66zi26VoTDv8yRgm0Fccecssto+MhsZ0D/DGW2sm8E8AjW7NU5VVTRt5GxbeZ5qBuJr+HyLYkjQ==
+
 picomatch@^2.0.4, picomatch@^2.0.5, picomatch@^2.2.1, picomatch@^2.2.2:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.2.2.tgz#21f333e9b6b8eaff02468f5146ea406d345f4dad"
   integrity sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==
 
+picomatch@^2.2.3:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/picomatch/-/picomatch-2.3.1.tgz#3ba3833733646d9d3e4995946c1365a67fb07a42"
+  integrity sha512-JU3teHTNjmE2VCGFzuY8EXzCDVwEqB2a8fsIvwaStHhAWJEeVd1o1QD80CU6+ZdEXXSLbSsuLwJjkCBWqRQUVA==
+
 pify@^2.0.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/pify/-/pify-2.3.0.tgz#ed141a6ac043a849ea588498e7dca8b15330e90c"
@@ -6640,6 +6724,13 @@ readdirp@~3.5.0:
   dependencies:
     picomatch "^2.2.1"
 
+readdirp@~3.6.0:
+  version "3.6.0"
+  resolved "https://registry.yarnpkg.com/readdirp/-/readdirp-3.6.0.tgz#74a370bd857116e245b29cc97340cd431a02a6c7"
+  integrity sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==
+  dependencies:
+    picomatch "^2.2.1"
+
 rechoir@^0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/rechoir/-/rechoir-0.6.2.tgz#85204b54dba82d5742e28c96756ef43af50e3384"
@@ -6854,7 +6945,7 @@ reusify@^1.0.4:
   resolved "https://registry.yarnpkg.com/reusify/-/reusify-1.0.4.tgz#90da382b1e126efc02146e90845a88db12925d76"
   integrity sha512-U9nH88a3fc/ekCF1l0/UP1IosiuIjyTh7hBvXVMHYgVcfGvt897Xguj2UOLDeI5BG2m7/uwyaLVT6fbtCwTyzw==
 
-rimraf@^2.2.8, rimraf@^2.6.3:
+rimraf@^2.2.8, rimraf@^2.5.2, rimraf@^2.6.3:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
   integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
@@ -6964,6 +7055,13 @@ rxjs@^7.1.0:
   dependencies:
     tslib "~2.1.0"
 
+sade@^1.7.4:
+  version "1.8.1"
+  resolved "https://registry.yarnpkg.com/sade/-/sade-1.8.1.tgz#0a78e81d658d394887be57d2a409bf703a3b2701"
+  integrity sha512-xal3CZX1Xlo/k4ApwCFrHVACi9fBqJ7V+mwhBsuf/1IOKbBy098Fex+Wa/5QMubw09pSZ/u8EY8PWgevJsXp1A==
+  dependencies:
+    mri "^1.1.0"
+
 safe-buffer@^5.0.1, safe-buffer@^5.1.0, safe-buffer@^5.1.2:
   version "5.2.1"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
@@ -6986,6 +7084,16 @@ safe-regex@^1.1.0:
   resolved "https://registry.yarnpkg.com/safer-buffer/-/safer-buffer-2.1.2.tgz#44fa161b0187b9549dd84bb91802f9bd8385cd6a"
   integrity sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==
 
+sander@^0.5.0:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/sander/-/sander-0.5.1.tgz#741e245e231f07cafb6fdf0f133adfa216a502ad"
+  integrity sha1-dB4kXiMfB8r7b98PEzrfohalAq0=
+  dependencies:
+    es6-promise "^3.1.2"
+    graceful-fs "^4.1.3"
+    mkdirp "^0.5.1"
+    rimraf "^2.5.2"
+
 sane@^4.0.3:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/sane/-/sane-4.1.0.tgz#ed881fd922733a6c461bc189dc2b6c006f3ffded"
@@ -7206,6 +7314,16 @@ snapdragon@^0.8.1:
     source-map-resolve "^0.5.0"
     use "^3.1.0"
 
+sorcery@^0.10.0:
+  version "0.10.0"
+  resolved "https://registry.yarnpkg.com/sorcery/-/sorcery-0.10.0.tgz#8ae90ad7d7cb05fc59f1ab0c637845d5c15a52b7"
+  integrity sha1-iukK19fLBfxZ8asMY3hF1cFaUrc=
+  dependencies:
+    buffer-crc32 "^0.2.5"
+    minimist "^1.2.0"
+    sander "^0.5.0"
+    sourcemap-codec "^1.3.0"
+
 sort-keys@^1.0.0:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/sort-keys/-/sort-keys-1.1.2.tgz#441b6d4d346798f1b4e49e8920adfba0e543f9ad"
@@ -7267,7 +7385,7 @@ source-map@^0.7.3:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.7.3.tgz#5302f8169031735226544092e64981f751750383"
   integrity sha512-CkCj6giN3S+n9qrYiBTX5gystlENnRW5jZeNLHpe6aue+SrHcG5VYwujhW9s4dY31mEGsxBDrHR6oI69fTXsaQ==
 
-sourcemap-codec@^1.4.4:
+sourcemap-codec@^1.3.0, sourcemap-codec@^1.4.4:
   version "1.4.8"
   resolved "https://registry.yarnpkg.com/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz#ea804bd94857402e6992d05a38ef1ae35a9ab4c4"
   integrity sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==
@@ -7582,6 +7700,21 @@ supports-hyperlinks@^2.0.0:
     has-flag "^4.0.0"
     supports-color "^7.0.0"
 
+svelte-check@^2.4.5:
+  version "2.4.5"
+  resolved "https://registry.yarnpkg.com/svelte-check/-/svelte-check-2.4.5.tgz#a2001993034d495118980bd95577fb3e7980661a"
+  integrity sha512-nRft8BbG2wcxyCdHDZ7X43xLcvDzua3xLwq6wzHGcAF3ka3Jyhv2rvgq0+SF9NwHLMefp9C2XkM6etzsxK/cMQ==
+  dependencies:
+    chokidar "^3.4.1"
+    fast-glob "^3.2.7"
+    import-fresh "^3.2.1"
+    minimist "^1.2.5"
+    picocolors "^1.0.0"
+    sade "^1.7.4"
+    source-map "^0.7.3"
+    svelte-preprocess "^4.0.0"
+    typescript "*"
+
 svelte-jester@^1.1.2:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/svelte-jester/-/svelte-jester-1.3.0.tgz#f7de754d581ba73418506a915f6a041e6b008fc3"
@@ -7589,6 +7722,18 @@ svelte-jester@^1.1.2:
   dependencies:
     cosmiconfig "^6.0.0"
 
+svelte-preprocess@^4.0.0:
+  version "4.10.3"
+  resolved "https://registry.yarnpkg.com/svelte-preprocess/-/svelte-preprocess-4.10.3.tgz#9aac89a8abc3889fa5740fb34f7dd74f3c578e13"
+  integrity sha512-ttw17lJfb/dx2ZJT9sesaXT5l7mPQ9Apx1H496Kli3Hkk7orIRGpOw6rCPkRNzr6ueVPqb4vzodS5x7sBFhKHw==
+  dependencies:
+    "@types/pug" "^2.0.4"
+    "@types/sass" "^1.16.0"
+    detect-indent "^6.0.0"
+    magic-string "^0.25.7"
+    sorcery "^0.10.0"
+    strip-indent "^3.0.0"
+
 svelte-preprocess@^4.0.10:
   version "4.6.1"
   resolved "https://registry.yarnpkg.com/svelte-preprocess/-/svelte-preprocess-4.6.1.tgz#a7de4d91b32d5608b6637da960ee81e6089ae276"
@@ -7839,7 +7984,17 @@ ts-jest@^26.5.6:
     semver "7.x"
     yargs-parser "20.x"
 
-tslib@2.1.0, tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0, tslib@^2.3.1, tslib@~2.1.0:
+tslib@2.1.0, tslib@~2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
+  integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==
+
+tslib@^1.8.0, tslib@^1.8.1, tslib@^1.9.0:
+  version "1.14.1"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.14.1.tgz#cf2d38bdc34a134bcaf1091c41f6619e2f672d00"
+  integrity sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==
+
+tslib@^2.3.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.3.1.tgz#e8a335add5ceae51aa261d32a490158ef042ef01"
   integrity sha512-77EbyPPpMz+FRFRuAFlWMtmgUWGe9UOG2Z25NqCwiIjRhOf5iKGuzSe5P2w1laq+FkRy4p+PCuVkJSGkzTEKVw==
@@ -7938,6 +8093,11 @@ typedarray@^0.0.6:
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
+typescript@*:
+  version "4.5.5"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.5.5.tgz#d8c953832d28924a9e3d37c73d729c846c5896f3"
+  integrity sha512-TCTIul70LyWe6IJWT8QSYeA54WQe8EjQFU4wY52Fasj5UKx88LNYKCgBEHcOMOrFF1rKGbD8v/xcNWVUq9SymA==
+
 typescript@^4.5.2:
   version "4.5.2"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.5.2.tgz#8ac1fba9f52256fdb06fb89e4122fa6a346c2998"