test: replace deprecated tslint linter with eslint

`tslint` is now replaced as the linter for the repository and `eslint` is used in its place.
The eslint configuration maintains the existing behavioral rules as well as adding many recommended rules from both `eslint` and `@typescript-eslint` via their respective exported recommended configurations. By leveraging the recommended configurations, the repository's configuration has also been simplified. Development scripts and unit tests also can now have specific rule overrides which reduces the amount of manually introduced disabling comments throughout the code.

Author: clydin

.eslintignore

@@ -0,0 +1,11 @@
+/bazel-out/
+/dist-schema/
+/goldens/public-api
+/packages/angular_devkit/build_angular/test/
+/packages/angular_devkit/build_webpack/test/
+/packages/angular_devkit/schematics_cli/schematic/files/
+/tests/
+.yarn/
+dist/
+node_modules/
+third_party/

.eslintrc.json

@@ -0,0 +1,100 @@
+{
+  "root": true,
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:import/typescript",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking",
+    "prettier"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "project": "tsconfig.json",
+    "sourceType": "module"
+  },
+  "plugins": ["eslint-plugin-import", "header", "@typescript-eslint"],
+  "rules": {
+    "@typescript-eslint/consistent-type-assertions": "error",
+    "@typescript-eslint/no-explicit-any": "error",
+    "@typescript-eslint/no-non-null-assertion": "error",
+    "@typescript-eslint/no-unnecessary-qualifier": "error",
+    "@typescript-eslint/no-unused-expressions": "error",
+    "curly": "error",
+    "header/header": ["error", "block", [{ "pattern": "Copyright Google LLC" }]],
+    "import/first": "error",
+    "import/newline-after-import": "error",
+    "import/no-absolute-path": "error",
+    "import/no-duplicates": "error",
+    "import/no-extraneous-dependencies": ["error", { "devDependencies": false }],
+    "import/no-unassigned-import": ["error", { "allow": ["symbol-observable"] }],
+    "import/order": [
+      "error",
+      {
+        "alphabetize": { "order": "asc" },
+        "groups": [["builtin", "external"], "parent", "sibling", "index"]
+      }
+    ],
+    "max-len": [
+      "error",
+      {
+        "code": 140,
+        "ignoreUrls": true
+      }
+    ],
+    "max-lines-per-function": ["error", { "max": 200 }],
+    "no-caller": "error",
+    "no-console": "error",
+    "no-empty": ["error", { "allowEmptyCatch": true }],
+    "no-eval": "error",
+    "no-multiple-empty-lines": ["error"],
+    "no-throw-literal": "error",
+    "padding-line-between-statements": [
+      "error",
+      {
+        "blankLine": "always",
+        "prev": "*",
+        "next": "return"
+      }
+    ],
+    "sort-imports": ["error", { "ignoreDeclarationSort": true }],
+    "spaced-comment": [
+      "error",
+      "always",
+      {
+        "markers": ["/"]
+      }
+    ],
+
+    /* TODO: evaluate usage of these rules and fix issues as needed */
+    "no-case-declarations": "off",
+    "no-fallthrough": "off",
+    "no-underscore-dangle": "off",
+    "no-useless-escape": "off",
+    "@typescript-eslint/await-thenable": "off",
+    "@typescript-eslint/ban-types": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-var-requires": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off",
+    "@typescript-eslint/no-unsafe-return": "off",
+    "@typescript-eslint/prefer-regexp-exec": "off",
+    "@typescript-eslint/require-await": "off",
+    "@typescript-eslint/restrict-plus-operands": "off",
+    "@typescript-eslint/restrict-template-expressions": "off"
+  },
+  "overrides": [
+    {
+      "files": ["!packages/**", "**/*_spec.ts"],
+      "rules": {
+        "import/no-extraneous-dependencies": ["error", { "devDependencies": true }],
+        "max-lines-per-function": "off",
+        "no-console": "off"
+      }
+    }
+  ]
+}

.gitignore

@@ -44,6 +44,7 @@ yarn-error.log*
 .ng-dev.user*
 .husky/_
 .bazelrc.user
+.eslintcache
 
 # Mac OSX Finder files.
 **/.DS_Store

package.json

@@ -25,7 +25,7 @@
     "build-tsc": "tsc -p tsconfig.json",
     "debug:test": "node --inspect-brk ./bin/devkit-admin test",
     "debug:test-large": "node --inspect-brk ./bin/devkit-admin test --large --spec-reporter",
-    "lint": "tslint --project tsconfig.json",
+    "lint": "eslint --cache --max-warnings=0 \"**/*.ts\"",
     "templates": "node ./bin/devkit-admin templates",
     "validate": "node ./bin/devkit-admin validate",
     "postinstall": "yarn webdriver-update && yarn ngcc && yarn husky install",
@@ -122,6 +122,8 @@
     "@types/text-table": "^0.2.1",
     "@types/uuid": "^8.0.0",
     "@types/webpack-dev-server": "^3.1.7",
+    "@typescript-eslint/eslint-plugin": "4.22.0",
+    "@typescript-eslint/parser": "4.22.0",
     "@yarnpkg/lockfile": "1.1.0",
     "ajv": "8.2.0",
     "ajv-formats": "2.0.2",
@@ -143,6 +145,10 @@
     "cssnano": "5.0.2",
     "debug": "^4.1.1",
     "enhanced-resolve": "5.8.0",
+    "eslint": "7.25.0",
+    "eslint-config-prettier": "8.3.0",
+    "eslint-plugin-header": "3.1.1",
+    "eslint-plugin-import": "2.22.1",
     "express": "4.17.1",
     "fast-json-stable-stringify": "2.1.0",
     "find-cache-dir": "3.3.1",