chore(deps): bump to ecmaVersion 2020

[MikeMcC399]

Issue

The instructions in the original ESLint blog post Preparing your custom rules for ESLint v9.0.0 for converting the deprecated context.getScope() and context.getAncestors() did not work for ESLint >=7 <=8.3.0.

• I reported this in issue Docs: context migration suggestions fail on earlier v8 versions eslint/eslint.org#559.

• The ESLint team responded with PR fix: Update custom rules v9 upgrade post eslint/eslint.org#560.

The new suggestions involve using the Nullish coalescing operator (??). The code falls back to previous API standards if the new API calls aren't available, so it can be used flexibly in old and new ESLint versions.

The new suggestions however fail linting in this repo with the following error message:

error Parsing error: Unexpected token ?

Background

The Nullish coalescing operator (??) was introduced in ECMAScript 2020, the 11th edition (reference ECMAScript 2025 > Introduction).

ECMAScript 2020 (ES11) was released in June 2020.

The lowest supported version of Node.js is Release 18.x Node.js 18.0.0 was released 2 years after ECMAScript 2020.

• The current setting was added recently by refactor: migrate internal linting to recommended plugins #177 using the setting ecmaVersion 2018 from https://github.com/cypress-io/cypress/blob/develop/npm/eslint-plugin-dev/lib/index.js#L210

Change

Bump the ecmaVersion from 2018 to 2020

eslint-plugin-cypress/.eslintrc.json

Lines 37 to 39 in 9222abb

	"parserOptions": {
	"ecmaVersion": 2018
	}

Related

• Docs: context migration suggestions fail on earlier v8 versions eslint/eslint.org#559
• fix: Update custom rules v9 upgrade post eslint/eslint.org#560
• fix: convert deprecated context calls #182

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🎉 This PR is included in version 3.0.2 🎉

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