fix(typescript-estree): allow providing more one than one existing program in config

[JamesHenry]

The program (singular) option was only merged yesterday and had not yet been released (other than auto canaries).

[typescript-eslint]

Thanks for the PR, @JamesHenry!

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[codecov]

Codecov Report

Merging #3508 (ead704e) into master (ced9b26) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3508   +/-   ##
=======================================
  Coverage   92.63%   92.63%           
=======================================
  Files         325      325           
  Lines       11227    11230    +3     
  Branches     3164     3165    +1     
=======================================
+ Hits        10400    10403    +3     
  Misses        367      367           
  Partials      460      460           

Flag	Coverage Δ
unittest	92.63% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ils/src/ast-utils/eslint-utils/ReferenceTracker.ts	100.00% <ø> (ø)
...es/experimental-utils/src/ts-eslint-scope/index.ts	100.00% <ø> (ø)
...t-estree/src/create-program/useProvidedPrograms.ts	84.84% <100.00%> (ø)

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	nx run-many --target=typecheck --all --parallel

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[JamesHenry]

Changed to draft while investigating a discrepancy between the lint results behaviour when providing multiple programs ahead of time vs letting typescript-eslint create watch programs

[JamesHenry]

Resolved as per slack discussion, changing back to ready for review

[bradzacher]

LGTM

[bradzacher]

you shouldn't need this as we add it automatically:

typescript-eslint/packages/typescript-estree/src/create-program/useProvidedProgram.ts

Line 58 in ced9b26

CORE_COMPILER_OPTIONS,

typescript-eslint/packages/typescript-estree/src/create-program/shared.ts

Lines 14 to 22 in ced9b26

	const CORE_COMPILER_OPTIONS: ts.CompilerOptions = {
	noEmit: true, // required to avoid parse from causing emit to occur
	/**
	* Flags required to make no-unused-vars work
	*/
	noUnusedLocals: true,
	noUnusedParameters: true,
	};

[JamesHenry]

Yeah but those are not invoked when we provide our own programs up front with the utility from parser, so I thought it made sense to keep the tsconfig.eslint.json in a state where it is independently working

[JamesHenry]

Oh sorry, you are just focusing on noEmit - you are right there!

[JamesHenry]

I was thinking of allowJs