[EngSys] update engines required node version and @types/node version to v14

***NO_CI***

- string replace in package json: 12 => 14 for engines/node and for dependency @types/node
- eslint: update `json-engine-is-present` rule to 14.0.0 as LTS version
- identity: react to typing improvements for `readFile()`'s `options.encoding`
- trivial generated api.md file changes due to @types/node version bump

Author: jeremymeng

common/config/rush/pnpm-lock.yaml

@@ -61,7 +61,7 @@
     "@types/fs-extra": "^9.0.13",
     "@types/minimist": "~1.2.0",
     "@types/mocha": "^7.0.2",
-    "@types/node": "^12.0.0",
+    "@types/node": "^14.0.0",
     "@types/prettier": "^2.0.1",
     "builtin-modules": "^3.1.0",
     "chai": "^4.2.0",

common/tools/dev-tool/package.json

@@ -7,7 +7,7 @@ import { FileInfo } from "../findMatchingFiles";
  * The oldest Node version that we guarantee sample programs will support.
  * Samples may support older versions, but must support at least this version.
  */
-export const MIN_SUPPORTED_NODE_VERSION = "12.0.0";
+export const MIN_SUPPORTED_NODE_VERSION = "14.0.0";
 
 /**
  * An interface for the sample configuration metadata within an Azure SDK for

common/tools/dev-tool/src/util/samples/configuration.ts

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "CommonJS client library samples for JavaScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "repository": {
     "type": "git",

common/tools/dev-tool/test/samples/files/expectations/cjs-forms/javascript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "CommonJS client library samples for TypeScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "scripts": {
     "build": "tsc",
@@ -31,7 +31,7 @@
     "@azure-test2/test2": "next"
   },
   "devDependencies": {
-    "@types/node": "^12.0.0",
+    "@types/node": "^14.0.0",
     "typescript": "~4.8.0",
     "rimraf": "latest"
   }

common/tools/dev-tool/test/samples/files/expectations/cjs-forms/typescript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "Azure Template client library samples for JavaScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "repository": {
     "type": "git",

common/tools/dev-tool/test/samples/files/expectations/output-customization/javascript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "Azure Template client library samples for TypeScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "scripts": {
     "build": "tsc",
@@ -29,7 +29,7 @@
     "dotenv": "latest"
   },
   "devDependencies": {
-    "@types/node": "^12.0.0",
+    "@types/node": "^14.0.0",
     "typescript": "~4.8.0",
     "rimraf": "latest"
   }

common/tools/dev-tool/test/samples/files/expectations/output-customization/typescript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "Azure Template client library samples for JavaScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "repository": {
     "type": "git",

common/tools/dev-tool/test/samples/files/expectations/simple/javascript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "Azure Template client library samples for TypeScript",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "scripts": {
     "build": "tsc",
@@ -29,7 +29,7 @@
     "dotenv": "latest"
   },
   "devDependencies": {
-    "@types/node": "^12.0.0",
+    "@types/node": "^14.0.0",
     "typescript": "~4.8.0",
     "rimraf": "latest"
   }

common/tools/dev-tool/test/samples/files/expectations/simple/typescript/package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "description": "Azure Template client library samples for JavaScript (Beta)",
   "engines": {
-    "node": ">=12.0.0"
+    "node": ">=14.0.0"
   },
   "repository": {
     "type": "git",