A `highlight` mark WITHOUT a color now serializes as the Obsidian/GFM `==text==`
syntax (closing hand-authoring gap A19); a highlight WITH a color keeps the
`<mark style="background-color: …">` HTML form (condition is deterministic on
the color attr). On the raw-HTML path (columns/spanned cells) BOTH forms stay
`<mark>` via inlineToHtml — markdown is not re-parsed inside a raw-HTML block.
Parse: `==` is not standard markdown, so the importer uses a DEDICATED marked
instance (`new Marked().use({extensions:[highlightMark]})`) rather than the
global singleton — registered once, never leaks `==` behavior to other callers.
The inline extension tokenizes `==text==` (non-empty, non-space-leading inner,
lazy so `==a== ==b==` is two marks; inner re-tokenized so nested marks survive;
`====`/`==x` fail-open to literal) into `<mark>` with no color, which the schema
parses as a color-less highlight. Inline code (`` `a == b` ``) stays code via
marked token precedence. marked 17 defaults (gfm:true, breaks:false) are
identical for the fresh instance, so tables/strike/autolinks are unaffected.
Losslessness: a LITERAL `==` in a text run would otherwise be misparsed as a
highlight on the next import, so `case "text"` backslash-escapes each `=` of a
`==` pair (marked decodes `\=` back to `=`), and this round-trips byte-stably.
The escape does NOT run for inline-code runs, and — CRITICALLY — codeBlock now
reads its child text RAW (schema `content: "text*"`) instead of routing through
`case "text"`: marked does not decode `\=` inside a fence, so escaping there
would permanently stamp backslashes into any `==` comparison (ubiquitous in
source code) and corrupt the block on the git-sync data path.
Tests: new highlight.test.ts (19 cases incl. serialize forms, colored vs plain,
column `<mark>` path, nested marks, inline-code exclusion, literal-`==` escape,
fail-open, AND a codeBlock-with-`==` regression proving no backslash corruption
+ byte-stable round-trip). Golden inline-mark matrix flipped top-level no-color
highlight to `==m==`; the kept `<mark style=…>` assertions are the colored/
raw-HTML cases.
package vitest: 559 passed; tsc clean. git-sync: 268 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
claude code agent 227