feat(experimental-utils): add literal types to global option

[dora1998]

In addition to boolean values, the string values below are allowed in globals field of BaseConfig.

• "readable"
• "readonly"
• "writeable"
• "writable"
• "off"

Globals can be disabled with the string "off". For example, in an environment where most ES2015 globals are available but Promise is unavailable, you might use this config:

For historical reasons, the boolean value false and the string value "readable" are equivalent to "readonly". Similarly, the boolean value true and the string value "writeable" are equivalent to "writable". However, the use of older values is deprecated.

https://eslint.org/docs/user-guide/configuring/language-options#using-configuration-files-1

[typescript-eslint]

Thanks for the PR, @dora1998!

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[nx-cloud]

Nx Cloud Report

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	nx run-many --target=build --all --parallel
	nx run-many --target=typecheck --all --parallel
	nx test @typescript-eslint/eslint-plugin
	nx test @typescript-eslint/eslint-plugin-internal
	nx test @typescript-eslint/eslint-plugin-tslint
	nx test @typescript-eslint/experimental-utils
	nx test @typescript-eslint/parser
	nx test @typescript-eslint/scope-manager
	nx test @typescript-eslint/typescript-estree
	nx test @typescript-eslint/visitor-keys

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[bradzacher]

thanks! 1 comment.

[bradzacher]

because these are considered deprecated - let's leave them out.
For the types where possible we've been excluding deprecated values/apis to help push people towards the correct things and prevent them from using old things that will be removed in a future version.

In the next major we can consider removing the boolean as well, considering that is deprecated and instead the string values are preferred.

Suggested change

	| 'readonly'
	| 'writable'
	| 'readable'
	| 'writeable'
	| 'off'
	| boolean;
	| 'readonly'
	| 'writable'
	| 'off'
	| boolean;

[dora1998]

It looks better:+1: I fixed it!

[codecov]

Codecov Report

Merging #3634 (f36944a) into master (f0861e0) will decrease coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3634      +/-   ##
==========================================
- Coverage   92.68%   92.58%   -0.11%     
==========================================
  Files         327      188     -139     
  Lines       11351     8480    -2871     
  Branches     3201     2607     -594     
==========================================
- Hits        10521     7851    -2670     
+ Misses        369      262     -107     
+ Partials      461      367      -94     

Flag	Coverage Δ
unittest	92.58% <ø> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ackages/experimental-utils/src/ts-eslint/Linter.ts	100.00% <ø> (ø)
packages/scope-manager/src/variable/Variable.ts
packages/scope-manager/src/lib/es2018.intl.ts
packages/scope-manager/src/lib/es2015.ts
...s/scope-manager/src/lib/webworker.importscripts.ts
packages/scope-manager/src/lib/es2020.string.ts
packages/scope-manager/src/scope/TSModuleScope.ts
packages/scope-manager/src/variable/index.ts
...cope-manager/src/definition/ClassNameDefinition.ts
packages/scope-manager/src/scope/BlockScope.ts
... and 130 more

[bradzacher]

thanks!