v3.3.0

Deprecated

This release introduced breaking changes, which have been reverted in v3.3.2. The bug fixes will be reintroduced in v4.0.0.

What's Changed

ESM

SVGO is now a dual package, serving for both Common JS and ESM usage. We believe there shouldn't be any problems, especially as SVGO as largely stateless, but feel free to open an issue if you encounter problems with this.

To be explicit, this is not a breaking change, and SVGO should continue to work in Common JS projects!

Thanks to @jdufresne for doing the bulk of the work.

Default Behavior

• convertColors, now converts all references to colors excluding references to IDs to lowercase. This can be disabled by setting convertCase to false.

Bug Fixes

• cleanupIds, treat both URI encoded and non-URI encoded IDs as the same. By @liuweifeng in #1982
• collapseGroups, check styles as well as attributes. By @johnkenny54 in #1952
• collapseGroups, move attributes atomically. By @johnkenny54 in #1930
• convertPathData, fix q control point when item is removed. By @KTibow in #1927
• convertPathData, preserve vertex for markers only paths. By @SethFalco in #1967
• mergePaths, don't merge paths if attributes/styles depend on the node's bounding box. By @johnkenny54 in #1964
• moveElemsAttrsToGroups, no longer moves the transforms if group has the filter attribute. By @johnkenny54 in #1933
• prefixIds, fixed issue where some IDs were not prefixed when style tag contained XML comments. By @john-neptune in #1942
• removeHiddenElems, don't remove node if child element has a referenced ID. By @johnkenny54 in #1925
• removeHiddenElems, treat path[opacity=0] as a non-rendering node. By @johnkenny54 in #1948
• removeUselessDefs, don't remove node if child element has an ID. By @johnkenny54 in #1923
• When stringifying path data, include a space before numbers represented in scientific notation. By @johnkenny54 in #1961
• No longer crashes when the output (-o argument) ends with a trailing slash to a location that didn't exist. By @SethFalco in #1954

SVG Optimization

• convertColors, introduce parameter to convert colors to common casing (lowercase/uppercase). By @JayLeininger in #1692
• removeDeprecatedAttrs, new plugin that is disabled by default to remove SVG attributes that are deprecated. By @jdufresne in #1869

Metrics

Before and after using vectors from various sources, with the default preset of each respective version:

SVG	Original	v3.2.0	v3.3.0	Delta
Arch Linux Logo	9.529 KiB	4.115 KiB	4.097 KiB	⬇️ 0.018 KiB
Blobs	50.45 KiB	42.623 KiB	42.609 KiB	⬇️ 0.014 KiB
Isometric Madness	869.034 KiB	540.582 KiB	540.073 KiB	⬇️ 0.509 KiB
tldr-pages Banner	2.071 KiB	1.07 KiB	1.07 KiB
Wikipedia Logo	161.551 KiB	111.668 KiB	111.668 KiB

Before and after of the browser bundle of each respective version:

	v3.2.0	v3.3.0	Delta
svgo.browser.js	910.9 kB	753.0 kB	⬇️ 157.9 kB