fix(typescript-estree): hash code to reduce update frequency

[yoyo930021]

try to fix #1132

[typescript-eslint]

Thanks for the PR, @yoyo930021!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

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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[yoyo930021]

We need to look at another solution for Vue SFC is slow.

[yoyo930021]

Test result:

• v2.6.1:

real 10.40
user 15.49
sys 0.80

• This PR:

real 6.62
user 10.21
sys 0.61

• v2.3.1:

real 6.32
user 10.03
sys 0.58

PS. The tested project is https://github.com/typescript-eslint/vega-lite.

[bradzacher]

LGMT. two minor nits
Thanks for this

[DanceParty]

Cannot wait to have this merged, my built time is drastically quicker and node cpu is much lower using this change. Thanks 🎉

[bradzacher]

LGTM, thanks for this

[JoshuaKGoldberg]

FWIW, (presumably this fix in) 2.7.0 brought time to lint a ~2000 file, 90% TS / 10% JS project from 10 minutes to 2. Awesome fix, thank you so much! 🚀