jest-diff

Upstream: https://github.com/facebook/jest/tree/v27.4.7/packages/jest-diff

Display differences clearly so people can review changes confidently.

The diff named export serializes values, compares them line-by-line, and returns a string which includes comparison lines.

Two named exports compare strings character-by-character:

• diffStringsUnified returns a string.
• diffStringsRaw returns an array of Diff objects.

Three named exports compare arrays of strings line-by-line:

• diffLinesUnified and diffLinesUnified2 return a string.
• diffLinesRaw returns an array of Diff objects.

:pencil2: Notes

• CleanupSemantic.lua is adapted from the Lua version of diff-match-patch to resemble the upstream cleanupSemantics.ts instead of being a direct port of it.
  • Tests for it are added, which are not included in the upstream `jest-diff
• Changes to tests:
  • Snapshots in Diff.spec.lua have their leading <g>, <r>, <d>, and <y> ANSI style codes manually removed.
  • Color formatting specific tests are omitted.
  • changeColor is assigned to a function that imitates chalk.inverse so we can test diffStringsUnified.
  • Array[], Object{} are changed to Table{}.