Remove cycle in printDiffs, diffLines and joinAlignedDiffs

[raymondnumbergenerator]

Summary

The jest-diff package has three files with cyclical dependencies. This makes the logic more confusing to follow and the distinction between files less clear. Several helper functions that should be private are also needed to be exported because of the cycles.

• formatTrailingSpaces, printDiffLine, printDeleteLine, printInsertLine, printCommonLine and createPatchMark are moved from printDiffs to joinAlignedDiffs and made private.
• hasCommonDiff in printDiffs is made private.
• countChanges and printAnnotation are moved from printDiffs to diffLines and made private.
• printDiffLines is moved from printDiffs to diffLines and exported there, imports are changed to reflect this.

Test plan

No new tests added, passes existing tests with yarn test.

I ran madge --circular to demonstrate that the cycles are gone.

Madge output before:

» madge --circular --extensions ts packages/jest-diff
Processed 24 files (453ms) (7 warnings)

✖ Found 2 circular dependencies!

1) src/diffLines.ts > src/printDiffs.ts
2) src/printDiffs.ts > src/joinAlignedDiffs.ts

Madge output after:

» madge --circular --extensions ts packages/jest-diff
Processed 24 files (449ms) (7 warnings)

✔ No circular dependency found!

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[SimenB]

Thanks! could you add a changelog entry as well? just in case 🙂

[SimenB]

Thanks @raymondnumbergenerator! Could you sign the CLA? Then I can merge 🙂

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[SimenB]

Thanks!

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