Update magic-string and adjust types.

[bmeurer]

The type of sourcesContent changed to allow for null elements, and rollup needs to be adjusted to that as well.

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Description

This PR updates magic-string past 0.27, addressing the breaking change in the sourcesContent type (going from string[] to (string|null)[]).

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[bmeurer]

I'll update this PR as soon as @Rich-Harris cuts a new release of magic-string that contains the updated type definitions.

[codecov]

Codecov Report

Merging #4846 (28a68ec) into master (45d5d53) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4846   +/-   ##
=======================================
  Coverage   98.99%   98.99%           
=======================================
  Files         219      219           
  Lines        7887     7887           
  Branches     2184     2184           
=======================================
  Hits         7808     7808           
  Misses         26       26           
  Partials       53       53           

Impacted Files	Coverage Δ
src/utils/collapseSourcemaps.ts	90.42% <100.00%> (ø)

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[lukastaegert]

I wonder why Node 14 does not want to install magic-string from Github

[bmeurer]

I pinged @Rich-Harris to cut a release, so we can wait until that happens.

[bmeurer]

Updated to the latest release version of magic-string, which brings the typing fixes as well as the x_google_ignoreList support (which is not utilized as part of this PR).

This is ready to land now.

[rollup-bot]

This PR has been released as part of rollup@3.15.1-1. Note that this is a pre-release, so to test it, you need to install Rollup via npm install rollup@3.15.1-1 or npm install rollup@beta. It will likely become part of a regular release later.

[rollup-bot]

This PR has been released as part of rollup@3.16.0. You can test it via npm install rollup.