perf(ts): transpileOnly when using nuxt-ts start

[kevinmarrec]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• Performance (a non-breaking change which improves performance)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Knowing Runtime TypeScript are already type checked during nuxt-ts build, type checking is not needed during nuxt-ts start.

By using ts-node transpileOnly option for the nuxt-ts start command, it results in a faster startup & lower base RAM usage.

Some stats around my own production server (VPS)

transpileOnly	Startup time	Memory usage	📊
false	~10s	120MB	👎
true	~3s	70MB	👍

Checklist

• I have updated tests to cover my changes
• All updated and existing tests are passing.

[codecov-io]

Codecov Report

Merging #4906 into dev will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #4906      +/-   ##
==========================================
+ Coverage   91.74%   91.83%   +0.08%     
==========================================
  Files          73       73              
  Lines        2412     2412              
  Branches      593      593              
==========================================
+ Hits         2213     2215       +2     
+ Misses        181      179       -2     
  Partials       18       18

Impacted Files	Coverage Δ
packages/typescript/src/index.js	68.42% <ø> (ø)	⬆️
packages/vue-renderer/src/renderer.js	95.65% <0%> (+1.08%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update fb13b41...72526cc. Read the comment docs.

[dschewchenko]

can you try typeCheck: false option for server?

[kevinmarrec]

@dschewchenko typeCheck is false by default but type-checking is enabled only because transpileOnly is set to false by default : https://github.com/TypeStrong/ts-node/blob/master/src/index.ts#L194

It's kind of weird what they're doing right here, but as far I know, just transpileOnly: true should be fine.