Enable importHelpers TypeScript compiler option

This avoids inlining the TypeScript helpers and instead imports them from tslib, saving bundle size

app/package.json

@@ -55,6 +55,7 @@
     "source-map-support": "^0.4.15",
     "strip-ansi": "^4.0.0",
     "textarea-caret": "^3.0.2",
+    "tslib": "^2.0.0",
     "ua-parser-js": "^0.7.12",
     "untildify": "^3.0.2",
     "username": "^2.3.0",

app/yarn.lock

@@ -1529,6 +1529,11 @@ to-readable-stream@^1.0.0:
   resolved "https://registry.yarnpkg.com/to-readable-stream/-/to-readable-stream-1.0.0.tgz#ce0aa0c2f3df6adf852efb404a783e77c0475771"
   integrity sha512-Iq25XBt6zD5npPhlLVXGFN3/gyR2/qODcKNNyTMd4vbm39HUaOiAM4PMq0eMVC/Tkxz+Zjdsc55g9yyz+Yq00Q==
 
+tslib@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.0.tgz#18d13fc2dce04051e20f074cc8387fd8089ce4f3"
+  integrity sha512-lTqkx847PI7xEDYJntxZH89L2/aXInsyF2luSafe/+0fHOMjlBNXdH6th7f70qxLDhul7KZK0zC8V5ZIyHl0/g==
+
 tunnel-agent@^0.6.0:
   version "0.6.0"
   resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.6.0.tgz#27a5dea06b36b04a0a9966774b290868f0fc40fd"

script/licenses/license-overrides.ts

@@ -44,4 +44,23 @@ COPYRIGHT HOLDERS WILL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL OR CONSEQ
 
 The name and trademarks of copyright holders may NOT be used in advertising or publicity pertaining to the work without specific, written prior permission. Title to copyright in this work will at all times remain with copyright holders.`,
   },
+
+  'tslib@2.0.0': {
+    repository: 'git+https://github.com/microsoft/tslib',
+    license: 'BSD',
+    source:
+      'https://github.com/microsoft/tslib/blob/74f1ff794985b33657b599b611e82937e3074617/LICENSE.txt',
+    sourceText: `Copyright (c) Microsoft Corporation.
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.`,
+  },
 }

script/tsconfig.json

@@ -3,6 +3,7 @@
     "module": "commonjs",
     "moduleResolution": "node",
     "esModuleInterop": true,
+    "importHelpers": true,
     "target": "es2017",
     "allowUnreachableCode": false,
     "allowUnusedLabels": false,

tsconfig.json

@@ -4,6 +4,7 @@
     "moduleResolution": "node",
     "target": "es2017",
     "esModuleInterop": true,
+    "importHelpers": true,
     "allowUnreachableCode": false,
     "allowUnusedLabels": false,
     "noImplicitReturns": true,