feat(eslint-plugin): Add a newrule.sh scaffolding script (#8759)

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

packages/eslint-plugin/newrule.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+if [[ -z $1 ]] ; then
+  echo "Enter name of rule, i.e.:"
+  echo "$0 lint-rule-name"
+  exit 1
+fi
+
+RULENAME=$1;
+
+
+sed -e "s/^  rules:.*/&'@spinnaker\/${RULENAME}': 2,/" -i '' base.config.js
+sed -e "s/^  rules:.*/&'${RULENAME}': require('.\/rules\/${RULENAME}'),/" -i '' eslint-plugin.js
+
+npx prettier --write base.config.js eslint-plugin.js
+
+
+
+# Write RULENAME.js
+(
+cat <<EndOfRuleFile
+'use strict';
+// @ts-check
+
+/**
+ * Import AST Types from 'estree'
+ * @typedef {import('estree').CallExpression} CallExpression
+ * @typedef {import('estree').ImportSpecifier} ImportSpecifier
+ */
+
+const _ = require('lodash/fp');
+
+const { getProgram } = require('../utils/utils');
+
+/** @type {RuleModule} */
+module.exports = {
+  create(context) {
+    return {
+      /** @param node {ImportSpecifier} */
+      ImportSpecifier(node) {
+        /** @type {ImportSpecifier[]} */
+        if (node.local && node.local.name === 'API') {
+          context.report({
+            node,
+            message: 'Do not import API',
+            fix: (fixer) => fixer.remove(node),
+          });
+        }
+      },
+    };
+  },
+  meta: {
+    fixable: 'code',
+    type: 'problem',
+    docs: {
+      description: 'Do not import API',
+    },
+  },
+};
+EndOfRuleFile
+) > rules/${RULENAME}.js
+
+
+# Write RULENAME.spec.js
+(
+cat <<EndOfSpecFile
+'use strict';
+
+const ruleTester = require('../utils/ruleTester');
+const rule = require('../rules/${RULENAME}');
+
+ruleTester.run('${RULENAME}', rule, {
+  valid: [
+    {
+      code: "import { Something } from 'somewhere';",
+    },
+  ],
+  invalid: [
+    {
+      code: "import { API } from '@spinnaker/core';",
+      output: "import {  } from '@spinnaker/core';",
+      errors: ["Do not import API"],
+    },
+  ],
+});
+
+EndOfSpecFile
+) > test/${RULENAME}.spec.js
+