Enforce type imports

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

Description

This will add an auto-fixable ESLint rule to enforce TypeScript type imports over regular imports when possible.

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#type-imports

or load it into the REPL:
https://rollupjs.org/repl/?pr=4661

[codecov]

Codecov Report

Merging #4661 (962e1cd) into master (4572e46) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4661   +/-   ##
=======================================
  Coverage   99.06%   99.06%           
=======================================
  Files         214      214           
  Lines        7554     7554           
  Branches     2096     2096           
=======================================
  Hits         7483     7483           
  Misses         23       23           
  Partials       48       48           

Impacted Files	Coverage Δ
src/Bundle.ts	100.00% <ø> (ø)
src/Chunk.ts	100.00% <ø> (ø)
src/ExternalChunk.ts	100.00% <ø> (ø)
src/Module.ts	100.00% <ø> (ø)
src/ModuleLoader.ts	100.00% <ø> (ø)
src/ast/NodeInteractions.ts	100.00% <ø> (ø)
src/ast/nodes/ArrayExpression.ts	100.00% <ø> (ø)
src/ast/nodes/ArrayPattern.ts	100.00% <ø> (ø)
src/ast/nodes/ArrowFunctionExpression.ts	94.73% <ø> (ø)
src/ast/nodes/AssignmentExpression.ts	100.00% <ø> (ø)
... and 70 more

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[rollup-bot]

This PR has been released as part of rollup@3.0.1. You can test it via npm install rollup.