feat(ts): upgrade ts-loader to v6

[clarkdo]

Types of changes

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

Description

PR for #5667

• upgrade ts-loader in @nuxt/typescript to v6
• remove ts-loader in root package.json
• limitnode >= 8.6 for @nuxt/typescript

@pi0 @kevinmarrec Do we need ts-loader to root package.json ?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly. (PR: #)
• I have added tests to cover my changes (if not applicable, please state why)
• All new and existing tests are passing.

[pi0]

LGTM

[kevinmarrec]

@clarkdo ts-loader can be safely removed from root package.json

I would suggest to add engines in packages/typescript/package.json as described here : #5667 (comment)

[clarkdo]

@kevinmarrec Sorry I missed adding changed file.

fixed

[codecov-io]

Codecov Report

Merging #5691 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #5691   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          81       81           
  Lines        2645     2645           
  Branches      673      673           
=======================================
  Hits         2528     2528           
  Misses         98       98           
  Partials       19       19

---

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[codecov-io]

Codecov Report

Merging #5691 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #5691   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          81       81           
  Lines        2645     2645           
  Branches      673      673           
=======================================
  Hits         2528     2528           
  Misses         98       98           
  Partials       19       19

---

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 8588ca9...1f2ad7e. Read the comment docs.