chore: add suggestion property to relevant rules

Author: G-Rath

src/rules/no-test-callback.ts

@@ -8,6 +8,7 @@ export default createRule({
       category: 'Best Practices',
       description: 'Avoid using a callback in asynchronous tests',
       recommended: false,
+      suggestion: true,
     },
     messages: {
       illegalTestCallback: 'Illegal usage of test callback',

src/rules/prefer-expect-assertions.ts

@@ -72,6 +72,7 @@ export default createRule<[], MessageIds>({
       description:
         'Suggest using `expect.assertions()` OR `expect.hasAssertions()`',
       recommended: false,
+      suggestion: true,
     },
     messages: {
       hasAssertionsTakesNoArguments:

src/rules/prefer-strict-equal.ts

@@ -13,6 +13,7 @@ export default createRule({
       category: 'Best Practices',
       description: 'Suggest using toStrictEqual()',
       recommended: false,
+      suggestion: true,
     },
     messages: {
       useToStrictEqual: 'Use `toStrictEqual()` instead',

src/rules/utils.ts

@@ -7,6 +7,13 @@ import {
 } from '@typescript-eslint/experimental-utils';
 import { version } from '../../package.json';
 
+// can be removed once we've on v3: https://github.com/typescript-eslint/typescript-eslint/issues/2060
+declare module '@typescript-eslint/experimental-utils/dist/ts-eslint/Rule' {
+  export interface RuleMetaDataDocs {
+    suggestion?: boolean;
+  }
+}
+
 const REPO_URL = 'https://github.com/jest-community/eslint-plugin-jest';
 
 export const createRule = ESLintUtils.RuleCreator(name => {