Update ESLint and related packages

Major update breaking changes:
- ESLint 7.0.0 (https://eslint.org/docs/user-guide/migrating-to-7.0.0) now includes
.eslint.rc.js in its list, which is fine for us. Other changes are not applicable
for us.
- eslint-plugin-mocha (https://github.com/lo1tuma/eslint-plugin-mocha/blob/master/CHANGELOG.md#700-may-13-2020)
drops support for ESLint <7, but this CL updates to 7+. Other changes are
not applicable for us.

DISABLE_THIRD_PARTY_CHECK=Updating ESLint
R=petermarshall@chromium.org

Change-Id: I7760e084ef87f73a92f9ea4e075fb4c065047f5a
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2534873
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
diff --git a/node_modules/regexpp/index.d.ts b/node_modules/regexpp/index.d.ts
index 5b6ff6f..7943c63 100644
--- a/node_modules/regexpp/index.d.ts
+++ b/node_modules/regexpp/index.d.ts
@@ -146,10 +146,11 @@
 

 declare module 'regexpp/parser' {

     import { Flags, RegExpLiteral, Pattern } from "regexpp/ast";

+    import { EcmaVersion } from "regexpp/ecma-versions";

     export namespace RegExpParser {

         interface Options {

             strict?: boolean;

-            ecmaVersion?: 5 | 2015 | 2016 | 2017 | 2018;

+            ecmaVersion?: EcmaVersion;

         }

     }

     export class RegExpParser {

@@ -161,10 +162,11 @@
 }

 

 declare module 'regexpp/validator' {

+    import { EcmaVersion } from "regexpp/ecma-versions";

     export namespace RegExpValidator {

         interface Options {

             strict?: boolean;

-            ecmaVersion?: 5 | 2015 | 2016 | 2017 | 2018;

+            ecmaVersion?: EcmaVersion;

             onLiteralEnter?(start: number): void;

             onLiteralLeave?(start: number, end: number): void;

             onFlags?(start: number, end: number, global: boolean, ignoreCase: boolean, multiline: boolean, unicode: boolean, sticky: boolean, dotAll: boolean): void;

@@ -239,3 +241,7 @@
     }

 }

 

+declare module 'regexpp/ecma-versions' {

+    export type EcmaVersion = 5 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020;

+}

+