fix(eslint-plugin): [no-implied-eval] handle the Function type

[soobing]

Fixes #2358
In case of using Function type the function checking is function type( named isFunctionType ) should return true.

[typescript-eslint]

Thanks for the PR, @soobing!

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The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[codecov]

Codecov Report

Merging #2435 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2435      +/-   ##
==========================================
- Coverage   92.81%   92.80%   -0.02%     
==========================================
  Files         290      290              
  Lines        9453     9459       +6     
  Branches     2647     2650       +3     
==========================================
+ Hits         8774     8778       +4     
  Misses        322      322              
- Partials      357      359       +2     

Flag	Coverage Δ
#unittest	92.80% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...ackages/eslint-plugin/src/rules/no-implied-eval.ts	93.75% <ø> (-2.81%)	⬇️

[soobing]

if you have any good idea to check symbol.flags === 33554497 please let me know. ✨

[bradzacher]

It might be better instead to just do something similar to what we've got for checking if the symbol is declared locally or not:

typescript-eslint/packages/eslint-plugin/src/rules/no-implied-eval.ts

Lines 128 to 135 in 2ada5af

	const declarations = symbol.getDeclarations() ?? [];
	for (const declaration of declarations) {
	const sourceFile = declaration.getSourceFile();
	if (program.isSourceFileDefaultLibrary(sourceFile)) {
	context.report({ node, messageId: 'noFunctionConstructor' });
	return;
	}
	}

[soobing]

@bradzacher Thank you for review. I updated to check if the symbol is declared locally or not :)

[bradzacher]

LGTM - thanks for your contribution!