[aversini]

Detect when all displayed (formatted) gzip/raw sizes are identical and treat them as equal for bar calculation. Update calcBarLength to accept an allSame flag and return the full barWidth when values are effectively the same to avoid misleading visual differences for values that format to the same string. Add tests to verify equal bar lengths for values that format identically and differing bar lengths when formatted values differ.

[Copilot]

Pull request overview

This PR refines the bundle size trend graph so that bar lengths better reflect the human-readable size labels and avoid misleading visual differences for values that format identically. It does this by detecting when the formatted gzip/raw sizes are all the same and treating them as equal for bar-scaling, with accompanying tests to lock in the behavior.

Changes:

• Update renderTrendGraph to compute whether all formatted gzip/raw sizes are identical and pass an allSame flag into the bar-length calculation.
• Extend the internal calcBarLength helper to accept the allSame flag and return the full bar width when values are effectively equal in their formatted representation.
• Add targeted tests verifying equal bar lengths when formatted values match and differing bar lengths when formatted values differ, alongside existing min-max scaling tests.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/bundlecheck/src/trend.ts	Adds formatted-size equality checks and updates bar-length calculation to use an allSame flag so all visually-equal sizes render with full-width bars.
packages/bundlecheck/src/__tests__/trend.test.ts	Adds tests covering the new equal-bar behavior for identically formatted values and ensuring bars differ when formatted values differ, preserving existing min-max scaling expectations.