3.3.0

• Change internal cache key to use relative asset paths instead of absolute paths.

3.2.0

• Updated SRI integrity to align with spec changes
• Deprecated Manifest integrity attribute
• Cleanup concatenating JS sources with newlines

3.1.0

• Removed "index" logical path normalization. Asset#logical_path is always the full logical path to the index file.
• Fixed static asset mtimes
• Fix manifest cleanup by age
• Removed redundant minifier level cache
• Updated SRI format according to spec changes

3.0.3

• Fix static asset mtime fallback
• Only warn when specified asset version can not be loaded.

3.0.2

• Ensure legacy Tilt handlers return String class data. Fixes issues with Haml Tilt handler.
• Type check and improve error messages raised on bad processor returned results.
• Improve error message for relative paths not under load path.
• Changed HTML encoding fallback from ISO-8859-1 to default external.
• Avoid falling back to 0 mtimes which may cause warnings with tar

3.0.1

• Fixed Context#depend_on with paths outside the load path.

3.0.0

Guide to upgrading from Sprockets 2.x to 3.x

• New processor API. Tilt interface is deprecated.
• Improved file store caching backend.
• MIME Types now accept charset custom charset detecters. Improves support for UTF-16/32 files.
• Environment#version no longer affects asset digests. Only used for busting the asset cache.
• Removed builtin support for LESS.
• Removed //= include directive support.
• Deprecated BundledAsset#to_a. Use BundledAsset#included to access debugging subcomponents.
• Support circular dependencies. For parity with ES6 modules.
• Manifest compilation will no longer generate .gz files by default. Mixing
  Content-Encoding and ETags is just a bad
  idea
• Added linked or referenced assets. When an asset is compiled, any of its links will be compiled as well.
• Introduce some limitations around enumerating all logical paths. 4.x will deprecate it and favor linked manifests for compliation.
• Add Asset integrity attribute for Subresource Integrity
• Default digest changed to SHA256. Configuring digest_class is deprecated.
• Rename Asset#digest to Asset#hexdigest. Asset#digest is deprecated and will
  return a raw byte String in 4.x.
• Added transitional compatibility flag to Environment#resolve(path, compat: true). 2.x mode operates with compat: true and 4.x with compat: false
• manifest-abc123.json renamed to .sprockets-abc123.json