feat: drop typescript 3 and Node.js 10 support (#275)

* refactor: address all the typescript deprecations by using the factory

* refactor: some of the statements are redundant. It is not necessary to write to write only properties.

* refactor: remove deprecated typescript function calls in favor of the factory; replace @ts-ignores with proper code (microsoft/TypeScript#40263 (comment))

* refactor: use factory functions instead of deprecated functions

* feat: bump peerDependencies version

* dps: upgrade to latest typescript version

* chore: replace rm with rimraf for cross platform support

* chore: replace fixture tests with inline snapshot tests

* docs: add notice about minimum TypeScript version.

* chore: drop node 10 support

Author: n1ru4l

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 15.x]
+        node-version: [12.x, 14.x, 15.x]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v2

README.md

@@ -14,6 +14,8 @@ yarn add graphql relay-compiler --dev
 yarn add typescript relay-compiler-language-typescript --dev
 ```
 
+**Note:** Starting with version 14.0.0 relay-compiler-language-typescript requires a minimum TypeScript version of 4.2.3 being installed in your project.
+
 ## Configuration
 
 ### relay-compiler

package.json

@@ -33,7 +33,7 @@
     "lib"
   ],
   "scripts": {
-    "build": "rm -rf lib && tsc --project tsconfig.build.json",
+    "build": "rimraf lib && tsc --project tsconfig.build.json",
     "lint": "tslint -c tslint.json --project tsconfig.json",
     "pr-check": "scripts/pr-check.sh",
     "prettier": "prettier --write '{src,types,test}/**/*.ts'",
@@ -98,18 +98,19 @@
     "relay-compiler": "^10.0.1",
     "relay-runtime": "^10.0.1",
     "relay-test-utils-internal": "^10.0.1",
+    "rimraf": "^3.0.2",
     "ts-jest": "^26.4.4",
     "ts-node": "^9.1.1",
     "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
-    "typescript": "4.1.5"
+    "typescript": "4.2.3"
   },
   "peerDependencies": {
-    "@types/react-relay": ">=7.0.0",
-    "@types/relay-runtime": ">=6.0.7",
-    "relay-compiler": ">=9.0.0",
-    "relay-runtime": ">=9.0.0",
-    "typescript": ">=3.6.4"
+    "@types/react-relay": ">=7.0.17",
+    "@types/relay-runtime": ">=10.1.8",
+    "relay-compiler": ">=10.1.3",
+    "relay-runtime": ">=10.1.3",
+    "typescript": ">=4.2.3"
   },
   "publishConfig": {
     "registry": "https://registry.npmjs.org/"