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Rank discoverability third among the goals, plan the move to GitHub and the outreach, and drop a text node's content in plain #161

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lilleman merged 8 commits from goals-reorder into main 2026-10-04 22:33:40 +02:00
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7 changed files with 171 additions and 152 deletions
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AGENTS.md
+1 -1
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@@ -169,7 +169,7 @@ reading is the ask. Never ask "A or B?": state the gap, the earlier entries of i
nearest text, a candidate entry in that file's voice, and the instance it yields. An entry that
keeps collecting instances is wrong: rewrite it.
Which output the audience expects — README goal 5 — is settled by a reader panel rather than
Which output the audience expects — README goal 6 — is settled by a reader panel rather than
asked: three fresh-context readers, one per README persona the question serves, each given only
`## Audience` and the input, writing what they expect before picking among outputs the goals
allow, rendered, shuffled, with no rationale and nothing saying what is implemented. Three agreeing
README.md
+12 -11
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@@ -28,13 +28,13 @@ The most useful ADF conversion library available, judged by these goals, in prio
1. **Lossless, and every call returns a result, never a throw.**
2. **ADF is the hub.**
3. **Each format reads and writes as its standard says.**
4. **Our markdown is CommonMark, extended only where CommonMark has no spelling.**
5. **No surprises: output reads and edits the way its audience expects.**
6. **Lossy conversion drops form, never content.**
7. **Runs in any JavaScript engine, with no runtime dependencies and nothing to configure or connect.**
8. **Fast, and linear in the document's size as JSON.**
9. **Easy to find, and clear at a glance what it does.**
3. **Easy to find, and clear at a glance what it does.**
4. **Each format reads and writes as its standard says.**
5. **Our markdown is CommonMark, extended only where CommonMark has no spelling.**
6. **No surprises: output reads and edits the way its audience expects.**
7. **Lossy conversion drops form, never content.**
8. **Runs in any JavaScript engine, with no runtime dependencies and nothing to configure or connect.**
9. **Fast, and linear in the document's size as JSON.**
## Audience
@@ -74,7 +74,7 @@ if (result.ok) {
}
```
Serves Goals 1, 2 and 7. Pure functions, each taking a whole document and returning a whole
Serves Goals 1, 2 and 8. Pure functions, each taking a whole document and returning a whole
result; no I/O, no configuration. `markdownToHtml` and `htmlToMarkdown` convert through ADF:
they keep only what ADF holds, and refuse what `markdownToAdf` or `htmlToAdf` refuses.
@@ -96,7 +96,7 @@ htmlToMarkdown(html: string): Result<string> // 0.2.0
## Plain markdown
Serves Goal 6. Plain markdown is a second flavour of the same grammar. `adfToPlainMarkdown` writes
Serves Goal 7. Plain markdown is a second flavour of the same grammar. `adfToPlainMarkdown` writes
markdown other tools render — GitHub, GitLab, Obsidian and the like — keeping the content and
dropping the rest: attributes, colours, layout, identity. Content is what a reader of the rendered
document sees or follows: its text, images and link targets. It refuses only
@@ -136,6 +136,7 @@ read replaces mentions, attachments and macros with text.
- A newline in text is a hard break and in an expand's title a space, edge whitespace outside a
link or code span is trimmed, carriage returns and null characters are removed, and an empty
paragraph drops.
- A text node's `content` drops: Atlassian's schema forbids it, so no rendered document shows it.
- An ordered list numbered past `999999999`, or adjacent ordered lists whose numbering does not
continue, is one bullet list keeping its numbers as text.
- A task list beside a bullet or decision list, or holding a block other than a task, joins one
@@ -200,7 +201,7 @@ emit refuses:
## The guarantees
Serves Goals 1, 3 and 4.
Serves Goals 1, 4 and 5.
- `markdownToAdf(adfToMarkdown(doc))` deep-equals `doc` as JSON, for a document of plain objects
as `JSON.parse` builds them — every key and value as `doc` holds it, adjacent text nodes, an
@@ -244,7 +245,7 @@ Serves Goals 1, 3 and 4.
## The package
Serves Goal 7. ESM only, no runtime dependencies, public npm. Built JavaScript with `.d.ts`
Serves Goal 8. ESM only, no runtime dependencies, public npm. Built JavaScript with `.d.ts`
beside it. Pure ECMAScript at an ES2022 baseline, reaching for no host API; the test suite runs
under Node, Deno and Bun, and a headless Firefox converts the corpus through the built entrypoint.
Contract: [`docs/decisions.md`](https://gitea.larvit.se/larvit/adf-codec/src/branch/main/docs/decisions.md#any-es2022-engine), §Any
docs/decisions.md
+34 -34
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@@ -24,7 +24,7 @@ sanitized and a mention keeps the test user's real account id.
## Markdown in is a canonical fixpoint
2026-08-23, the maintainer; every parsed document has converted back since 2026-10-04. Goals 1 and
4. Valid while markdown input may be written by hand.
5. Valid while markdown input may be written by hand.
The other direction is a canonical fixpoint, not byte-identity: human markdown normalizes, the way
back yields the library's canonical spelling, and that spelling round-trips byte-identically.
@@ -54,7 +54,7 @@ around the leaf. The grammar: `spec/flavour.md` §Inline nodes, **Adjacent text
## An empty key spells `empty`
2026-10-03, a writer panel and the maintainer. Goals 1 and 5. Valid while no attribute value
2026-10-03, a writer panel and the maintainer. Goals 1 and 6. Valid while no attribute value
spells an empty object or array.
An `attrs`, `content` or `marks` key holding an empty object or array is the reserved key with the
@@ -71,7 +71,7 @@ reads it back as `-0`. The grammar: `spec/flavour.md` §Block nodes and §The Co
## Empty markdown is a document of no blocks
2026-10-03, a writer panel and the maintainer. Goals 1 and 5. Valid while ADF's schema requires
2026-10-03, a writer panel and the maintainer. Goals 1 and 6. Valid while ADF's schema requires
`content` on `doc`.
Markdown holding no block reads as `{ content: [], type: 'doc', version: 1 }`, the document
@@ -94,7 +94,7 @@ checking its position, and refusing loses a document ADF itself keeps in an `uns
## The carry fence names the node type
2026-10-03, the maintainer. Goals 1 and 5. Valid while a code fence's info string reads back
2026-10-03, the maintainer. Goals 1 and 6. Valid while a code fence's info string reads back
verbatim.
The block carry is a code fence whose info string `adf:<type>` names the node's type, its body the
@@ -118,7 +118,7 @@ language, and none is empty beside another, since a text node holds text. The gr
## Foreign HTML sorts three ways
2026-08-23, the sort 2026-09-20, the maintainer. Goals 1 and 4. Valid while ADF holds no node
2026-08-23, the sort 2026-09-20, the maintainer. Goals 1 and 5. Valid while ADF holds no node
for a bare container, a comment or a script. Lands with `todo.md` item 6.
Every foreign element `htmlToAdf` and `markdownToAdf` read sorts one of three ways, never a silent
@@ -139,14 +139,14 @@ than they buy.
## Names stay text
2026-08-23, the maintainer. Goal 7. Valid while resolving a name to an id needs I/O.
2026-08-23, the maintainer. Goal 8. Valid while resolving a name to an id needs I/O.
A bare `@name` or `:smile:` in typed text stays a text node. Only directives produce
mention/emoji/media nodes; resolving names to ids is the consumer's job.
## Directives under `!adf:`
2026-08-23, prefixed `!adf:` 2026-09-16, the maintainer. Goals 4 and 5. Valid while prose does not
2026-08-23, prefixed `!adf:` 2026-09-16, the maintainer. Goals 5 and 6. Valid while prose does not
write `!adf:`.
Directives are one grammar for everything markdown lacks, namespaced under `!adf:`:
@@ -157,7 +157,7 @@ opener nests by itself and leaf versus container falls out of the node's content
## CommonMark is a subset
2026-08-23, the maintainer. Goal 4. Valid while prose rarely writes the shapes the carve-outs claim.
2026-08-23, the maintainer. Goal 5. Valid while prose rarely writes the shapes the carve-outs claim.
Plain CommonMark is a subset, with carve-outs (`spec/flavour.md`): literal text shaped like a
directive, a pipe table or a `~~` pair is claimed, and so is a code fence whose info string opens
@@ -166,14 +166,14 @@ claims, giving CommonMark its own reader, and `todo.md` item 65 ends the image g
## Tables
2026-08-23, the maintainer. Goal 5. Valid while a pipe table holds only one header row and inline
2026-08-23, the maintainer. Goal 6. Valid while a pipe table holds only one header row and inline
cells.
One header row plus plain inline cells → pipe table; anything richer → directive form.
## Links
2026-09-13, nesting 2026-09-17, the maintainer. Goals 1 and 5. Valid while CommonMark's link
2026-09-13, nesting 2026-09-17, the maintainer. Goals 1 and 6. Valid while CommonMark's link
syntax is what readers edit.
`[text](url "title")`, or `<url>` for a bare autolink-shaped text, wherever CommonMark spells the
@@ -192,7 +192,7 @@ accepted.
## Plain task ids come from position
2026-09-26, spelling 2026-09-29, the maintainer. Goals 6 and 7. Valid while a site rejects a task
2026-09-26, spelling 2026-09-29, the maintainer. Goals 7 and 8. Valid while a site rejects a task
node with no `localId`.
`plainMarkdownToAdf` gives each `taskList`, `taskItem` and `blockTaskItem` lacking one a `localId`
@@ -204,7 +204,7 @@ ids are only skipped.
## A callout title keeps its link targets
2026-09-29, the maintainer. Goals 5 and 6. Valid while an expand's `title` is a string.
2026-09-29, the maintainer. Goals 6 and 7. Valid while an expand's `title` is a string.
`plainMarkdownToAdf` writes a link in a folded callout's title as its text and its target in
parentheses: `> [!faq]- See [x](http://y)` reads to the title `See x (http://y)`. A link whose text
@@ -213,7 +213,7 @@ is its target, with or without `mailto:`, keeps its text alone: `<http://y>` tit
## The plain flavour's spellings
2026-09-14, panels 2026-09-25 and 2026-09-29, the maintainer. Goals 5 and 6. Valid while GitHub's
2026-09-14, panels 2026-09-25 and 2026-09-29, the maintainer. Goals 6 and 7. Valid while GitHub's
renderer is the one the audience's markdown is read in.
README §Plain markdown's rows come from a survey of GitHub, GitLab, Gitea, Obsidian, Pandoc,
@@ -232,7 +232,7 @@ past `[x]`/`[ ]`, and lifting bare URLs, `@name`, `:shortcode:` or ISO dates int
## The HTML dialect
2026-08-23, the maintainer. Goals 5 and 7. Valid while HTML output is read by consumers styling it
2026-08-23, the maintainer. Goals 6 and 8. Valid while HTML output is read by consumers styling it
themselves.
The HTML dialect mirrors the markdown flavour: semantic elements, stable `adf-*` classes, `data-*`
@@ -240,7 +240,7 @@ for what HTML cannot express, text always escaped. No stylesheet ships.
## No runtime dependencies
2026-08-23, the maintainer. Goal 7. Valid while ~20 lines of own code, or a vendored table, do each
2026-08-23, the maintainer. Goal 8. Valid while ~20 lines of own code, or a vendored table, do each
job a dependency would.
`dependencies` is empty. A runtime dependency enters only through an entry here stating why ~20
@@ -250,7 +250,7 @@ and HTML parsers are written in this repo.
## Standards ship as data
2026-08-30, the CommonMark suite 2026-09-05 and ADF's schemas 2026-09-13, the maintainer. Goals 1,
4 and 7. Valid while each table is fixed data a dependency would only wrap.
5 and 8. Valid while each table is fixed data a dependency would only wrap.
A table a standard fixes is data rather than a dependency: HTML5's 2125 semicolon-terminated
character references ship packed in their own module, so entity decoding is complete without one.
@@ -273,7 +273,7 @@ nodes that break it.
## Any ES2022 engine
2026-09-01, the maintainer. Goal 7. Valid while ES2022 is the floor browsers and servers share.
2026-09-01, the maintainer. Goal 8. Valid while ES2022 is the floor browsers and servers share.
The library runs on any ES2022 engine, not only Node — a browser as readily as a server. The
shipped source is ECMAScript and nothing else: no host import, no host global, no DOM.
@@ -287,13 +287,13 @@ never the higher one those repo-only tools want.
## ESM only
2026-08-23, the maintainer. Goal 7. Valid while the audience's toolchains all import ES modules.
2026-08-23, the maintainer. Goal 8. Valid while the audience's toolchains all import ES modules.
No CommonJS build, no dual-package hazard.
## One built entrypoint
2026-08-23, the maintainer. Goal 7. Valid while Node refuses to type-strip under `node_modules`.
2026-08-23, the maintainer. Goal 8. Valid while Node refuses to type-strip under `node_modules`.
Built JavaScript, `.d.ts` beside it. Do not add a TypeScript-source entrypoint — Node refuses to
type-strip under `node_modules` (`ERR_UNSUPPORTED_NODE_MODULES_TYPE_STRIPPING`), so it cannot serve
@@ -301,7 +301,7 @@ an npm consumer.
## Public on npm
2026-08-23, the name 2026-09-01, the maintainer. Goals 2 and 7. Valid while the package's source
2026-08-23, the name 2026-09-01, the maintainer. Goals 2 and 8. Valid while the package's source
stays public beside it.
Published to public npm as `@larvit/adf-codec`. Public source: the Gitea repo goes public,
@@ -375,7 +375,7 @@ handles one cause alike whichever node, attribute or direction raised it.
## `message` and `path`
2026-09-03, the path 2026-09-23, the maintainer. Goals 1 and 4. Valid while a person fixing the
2026-09-03, the path 2026-09-23, the maintainer. Goals 1 and 5. Valid while a person fixing the
input reads `message`.
- A message names the violation, not the rule alone — a rule by itself states a truth the reader
@@ -389,7 +389,7 @@ input reads `message`.
## Publish on a version bump
2026-08-23, converging 2026-09-03, the maintainer. Goal 7. Valid while CI on `main` holds the npm
2026-08-23, converging 2026-09-03, the maintainer. Goal 8. Valid while CI on `main` holds the npm
token.
`package.json` version on `main` is the source of truth. CI on `main`: tests green and the version
@@ -405,7 +405,7 @@ depend on a store that the gate would then have to keep.
## Docs describe the release being built
2026-09-16, the maintainer. Goal 7. Valid while a bump on `main` publishes.
2026-09-16, the maintainer. Goal 8. Valid while a bump on `main` publishes.
Docs on `main` describe the release being built rather than the version npm holds, so they match it
the moment the bump publishes; add no interim note marking the gap.
@@ -421,7 +421,7 @@ nesting a spelling inside its own kind (`*(*a*)*`) names that mark once.
## The gate runs on Deno and Bun
2026-09-01, Deno's reason 2026-09-28, the maintainer. Goals 3 and 7. Valid while the library claims
2026-09-01, Deno's reason 2026-09-28, the maintainer. Goals 4 and 8. Valid while the library claims
any ES2022 engine.
The gate runs the suite under Deno and Bun as well as Node. Bun runs JavaScriptCore, the one engine
@@ -433,7 +433,7 @@ over the corpus rather than over a smoke import.
## The gate installs the tarball
2026-09-03, the maintainer. Goal 7. Valid while consumers install the packed package.
2026-09-03, the maintainer. Goal 8. Valid while consumers install the packed package.
The gate packs the build and installs the tarball under `package-tests/`, so `files`, `exports`
and `types` are proved on the artifact that ships rather than on the source tree a self-reference
@@ -445,7 +445,7 @@ resolver maps them, under `NodeNext` alone; a `.d.ts` reader that is not `tsc` s
## Firefox reads the build
2026-09-04, the maintainer. Goal 7. Valid while the library claims a browser and no other leg runs
2026-09-04, the maintainer. Goal 8. Valid while the library claims a browser and no other leg runs
SpiderMonkey.
A headless Firefox loads `dist/index.js` over HTTP and converts the round-trip, normalization and
@@ -517,7 +517,7 @@ markdown, on a fixed seed in the gate; a counterexample found becomes a round-tr
## The CommonMark suite checks three ways
2026-08-27, the maintainer. Goals 1 and 3. Valid while the suite's answers are HTML ADF cannot be
2026-08-27, the maintainer. Goals 1 and 4. Valid while the suite's answers are HTML ADF cannot be
compared against.
Each example is a named error or markdown that parses and emits to itself byte for byte; its
@@ -564,12 +564,12 @@ once doubled the parser's frames per level.
## No value `JSON.parse` or `structuredClone` builds loops a call
2026-10-04, the maintainer. Goals 1 and 8. Valid while every persona hands in plain data, as
2026-10-04, the maintainer. Goals 1 and 9. Valid while every persona hands in plain data, as
`JSON.parse` or `structuredClone` builds it.
The guards walk a value by `Object.values` and refuse a cycle in it. An inherited or non-enumerable
key, a getter, a Proxy or a custom iterator is the caller's to rule out: no persona builds one.
Goal 8's size counts ADF as JSON, so a shared object costs once per place it is held.
Goal 9's size counts ADF as JSON, so a shared object costs once per place it is held.
## Nothing spreads an unbounded array
@@ -589,7 +589,7 @@ termination is the loop's own check.
## Readers scan by index
2026-08-30, the kept scan 2026-09-18, the maintainer. Goal 8. Valid while the pipeline persona
2026-08-30, the kept scan 2026-09-18, the maintainer. Goal 9. Valid while the pipeline persona
feeds documents nobody typed.
A reader takes the text and an index — a sticky regex whose `lastIndex` the caller sets on the line
@@ -601,7 +601,7 @@ two cannot disagree — which is what makes the kept value a memo rather than a
## The spelling memo
2026-09-19, the maintainer. Goal 8. Valid while the `commonMarkSpelling` ask spells a node once
2026-09-19, the maintainer. Goal 9. Valid while the `commonMarkSpelling` ask spells a node once
per level above it otherwise.
The parse and the plain reduction keep each node's readable spelling in a memo, so the
@@ -613,7 +613,7 @@ one. Only what succeeded is kept, so no path minted at another position is ever
## Cost fixes are measured, never timed
2026-09-18, the maintainer and the stability-reviewer. Goal 8. Valid while Goal 8 promises growth
2026-09-18, the maintainer and the stability-reviewer. Goal 9. Valid while Goal 9 promises growth
rather than a figure.
A cost fix that changes no behaviour lands on the suite staying green with no fixture output
@@ -632,7 +632,7 @@ refuses it — which is how the whitespace carry finds a line edge.
## Emphasis follows CommonMark's matching
2026-08-27, the maintainer. Goals 1 and 3. Valid while CommonMark's emphasis rules are the
2026-08-27, the maintainer. Goals 1 and 4. Valid while CommonMark's emphasis rules are the
reader's.
Emphasis is spelled against CommonMark's matching, never flanking alone: a delimiter run in text
@@ -641,7 +641,7 @@ only ones in play, and a pair that matching hands to another delimiter rides the
## Readable spellings take the `try` prefix
2026-09-21, the maintainer. Goals 1 and 5. Valid while a readable spelling's refusal would cost a
2026-09-21, the maintainer. Goals 1 and 6. Valid while a readable spelling's refusal would cost a
document the general form spells.
A readable spelling tried ahead of a general one takes the `try` prefix and fails only where the
src/markdown/plain/adf-to-plain-markdown.test.ts
+1
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@@ -314,6 +314,7 @@ test('breaks a line at a newline and trims whitespace at every edge CommonMark s
assert.equal(plain(node('heading', { level: 1 }, text(' h\ni '))), '# h i\n')
assert.equal(plain(paragraph(text('a\r\u0000b'))), 'ab\n')
assert.equal(plain(paragraph(text('x', link('/u', 't\r\u0000')))), '[x](/u "t")\n')
assert.equal(plain(paragraph({ content: [text('dropped')], text: 'a', type: 'text' }, text('b'))), 'ab\n')
})
test('keeps a code span opening a line, whose backticks open no fence', () => {
src/markdown/plain/editor-normal.test.ts
+5 -5
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@@ -77,9 +77,9 @@ test('normalizes blocks and mark attributes nesting far past the levels a recurs
assert.deepEqual(merged.content?.[0]?.content?.map((text) => text.text), ['ab'])
})
test('joins a text node holding content to no neighbour, so its content is kept', () => {
const holding: AdfNode = { content: [{ text: 'kept', type: 'text' }], text: 'a', type: 'text' }
for (const content of [[holding, { text: 'b', type: 'text' }], [{ text: 'b', type: 'text' }, holding]]) {
assert.deepEqual(toEditorNormal({ content: [{ content, type: 'paragraph' }], type: 'doc', version: 1 }).content, [{ content, type: 'paragraph' }])
}
test('drops the content a text node holds, and joins the node as any other', () => {
const holding: AdfNode = { content: [{ text: 'dropped', type: 'text' }], text: 'a', type: 'text' }
const normal = (content: AdfNode[]): AdfNode[] | undefined => toEditorNormal({ content: [{ content, type: 'paragraph' }], type: 'doc', version: 1 }).content
assert.deepEqual(normal([holding, { text: 'b', type: 'text' }]), [{ content: [{ text: 'ab', type: 'text' }], type: 'paragraph' }])
assert.deepEqual(normal([{ text: 'b', type: 'text' }, holding]), [{ content: [{ text: 'ba', type: 'text' }], type: 'paragraph' }])
})
src/markdown/plain/editor-normal.ts
+4 -3
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@@ -7,9 +7,9 @@ type JsonContainer = JsonValue[] | { [key: string]: JsonValue }
type NodeHolder = { content?: AdfNode[] }
// The editor's rule is the reader's over the pair's editor-normal forms; a text node holding content never joins, so its content is kept.
// The editor joins two text nodes where the reader would join their editor-normal forms.
export function joinsWhenEditorNormal(previous: AdfNode, node: AdfNode): boolean {
if (previous.type !== 'text' || node.type !== 'text' || nodeContent(previous).length > 0 || nodeContent(node).length > 0) return false
if (previous.type !== 'text' || node.type !== 'text') return false
return joinsWhenRead(normalNode(previous), normalNode(node))
}
@@ -25,7 +25,8 @@ export function toEditorNormal(document: AdfDocument): AdfDocument {
if (content.length === 0) continue
entry.holder.content = content.map((source) => {
const holder = normalNode(source)
pending.push({ holder, source })
// Atlassian's schema forbids content on a text node, so the editor drops it.
if (source.type !== 'text') pending.push({ holder, source })
return holder
})
}
todo.md
+114 -98
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@@ -6,7 +6,7 @@
`Bar = 9`
`Next ID = 70`
`Next ID = 74`
| Goal | W |
|---|---|
@@ -24,41 +24,52 @@
| ID | Release | Exempt | Item | R | S | A | G | Goals | Score |
|---|---|---|---|---|---|---|---|---|---|
| 7 | 0.2.0 | | **Ship HTML: `adfToHtml`, `htmlToAdf`, and `markdownToHtml` / `htmlToMarkdown` composed through ADF.** | 6 | 9 | 9 | 9 | 2, 3 | 25.8 |
| 47 | 0.2.0 | | **Open the README with what the package is, what it does and for whom.** | 1 | 4 | 7 | 9 | 3 | 26.0 |
| 7 | 0.2.0 | | **Ship HTML: `adfToHtml`, `htmlToAdf`, and `markdownToHtml` / `htmlToMarkdown` composed through ADF.** | 6 | 9 | 9 | 9 | 2, 4 | 25.8 |
| 45 | 0.2.0 | | **Replace `isAdfDocument` with a reader returning `Result<AdfDocument>`.** | 2 | 3 | 6 | 8 | 1 | 25.2 |
| 67 | 0.2.0 | defect | **Push an expand title's leaves one at a time, so a title carrying many text nodes returns a result.** | 1 | 1 | 4 | 9 | 1 | 24.8 |
| 6 | 0.2.0 | decision | **Specify the HTML dialect.** | 2 | 6 | 7 | 8 | 2, 3 | 24.7 |
| 64 | 0.2.0 | defect | **Read back unchanged on V8 every JSON key the emitter writes, with a fixture whose key holds `\`, `"` or a control character.** | 4 | 4 | 6 | 8 | 1, 7 | 23.0 |
| 6 | 0.2.0 | decision | **Specify the HTML dialect.** | 2 | 6 | 7 | 8 | 2, 4 | 24.7 |
| 64 | 0.2.0 | defect | **Read back unchanged on V8 every JSON key the emitter writes, with a fixture whose key holds `\`, `"` or a control character.** | 4 | 4 | 6 | 8 | 1, 8 | 23.0 |
| 66 | 0.2.0 | defect | **Refuse an attribute value that is not a plain object, array or JSON primitive.** | 3 | 2 | 5 | 8 | 1 | 22.5 |
| 43 | 0.2.0 | decision | **Give each markdown input its own reader, strict to its own standard.** | 6 | 7 | 8 | 9 | 3, 4 | 22.3 |
| 65 | 0.2.0 | defect | **Read an image not alone in its paragraph as its alt text linked to its URL, and a titled image alone in its paragraph as the image captioned with its title.** | 5 | 5 | 7 | 7 | 3, 4, 6 | 18.7 |
| 71 | 0.2.0 | | **Add a README table comparing the package with the other ADF converters, each cell checked against that package's own docs or behaviour.** | 1 | 3 | 6 | 7 | 3 | 21.2 |
| 43 | 0.2.0 | decision | **Give each markdown input its own reader, strict to its own standard.** | 6 | 7 | 8 | 9 | 4, 5 | 20.3 |
| 68 | 0.2.0 | | **Carry a non-text inline node holding `content` or `text`, a block holding `text`, and a leaf block holding `content`.** | 3 | 3 | 4 | 7 | 1 | 18.2 |
| 49 | 0.2.0 | | **Read a list whose bullet or ordered delimiter changes as two lists, in both readers, and retire `!adf:listBreak`.** | 4 | 5 | 5 | 8 | 3, 4 | 17.2 |
| 65 | 0.2.0 | defect | **Read an image not alone in its paragraph as its alt text linked to its URL, and a titled image alone in its paragraph as the image captioned with its title.** | 5 | 5 | 7 | 7 | 4, 5, 7 | 17.1 |
| 70 | 0.2.0 | | **Give `package.json` the `keywords` someone searching npm for an ADF converter types.** | 1 | 1 | 4 | 6 | 3 | 16.1 |
| 72 | 0.2.0 | | **Make GitHub the canonical repository, with `gitea.larvit.se/larvit/adf-codec` a read-only pull mirror of it.** | 5 | 6 | 5 | 8 | 3 | 16.0 |
| 49 | 0.2.0 | | **Read a list whose bullet or ordered delimiter changes as two lists, in both readers, and retire `!adf:listBreak`.** | 4 | 5 | 5 | 8 | 4, 5 | 15.5 |
| 46 | 0.2.0 | | **Publish the bundle size in the README, failing the release pipeline when it drifts.** | 2 | 4 | 5 | 5 | 3, 8 | 14.8 |
| 61 | 0.2.0 | decision | **Have the emitter ask the inline reader how a line reads back, in place of `line-escaping.ts` predicting it.** | 6 | 8 | 3 | 8 | 1 | 14.0 |
| 52 | 0.2.0 | | **Spell `colwidth` as a comma list, `colwidth="340,420"`.** | 3 | 3 | 5 | 6 | 5 | 13.0 |
| 51 | 0.2.0 | | **Match a reference label to its definition under Unicode case folding.** | 2 | 2 | 2 | 7 | 3, 4 | 12.4 |
| 53 | 0.2.0 | | **Put a block's `marks` spelling to the writer panel and adopt its pick.** | 4 | 5 | 5 | 6 | 5 | 11.5 |
| 52 | 0.2.0 | | **Spell `colwidth` as a comma list, `colwidth="340,420"`.** | 3 | 3 | 5 | 6 | 6 | 11.5 |
| 51 | 0.2.0 | | **Match a reference label to its definition under Unicode case folding.** | 2 | 2 | 2 | 7 | 4, 5 | 10.9 |
| 60 | 0.2.0 | decision | **Collect the questions `parse/` asks `emit/` into one named module.** | 3 | 4 | 2 | 6 | 2 | 10.7 |
| 59 | 0.2.0 | decision | **Group the directive grammar into `src/markdown/directive/`, move `Read<T>` to `result.ts`, and move `Flavour` to `markdown/flavour.ts`.** | 3 | 5 | 2 | 6 | 2 | 10.4 |
| 50 | 0.2.0 | | **Read `[](/url)` and `[]()` as CommonMark's empty link.** | 4 | 4 | 3 | 6 | 3, 4, 6 | 10.4 |
| 53 | 0.2.0 | | **Put a block's `marks` spelling to the writer panel and adopt its pick.** | 4 | 5 | 5 | 6 | 6 | 10.0 |
| 62 | 0.2.0 | decision | **Move the plain flavour's reading out of `parse/` and its writing out of `emit/` into `markdown/plain/`, so `emit/` no longer imports `plain/`.** | 4 | 5 | 2 | 6 | 2 | 9.4 |
| 50 | 0.2.0 | | **Read `[](/url)` and `[]()` as CommonMark's empty link.** | 4 | 4 | 3 | 6 | 4, 5, 7 | 9.0 |
| 73 | 0.3.0 | | **Announce the package where someone needing an ADF converter already reads: JRACLOUD-77436, the Atlassian developer community and Stack Overflow's ADF-to-markdown questions.** | 1 | 2 | 6 | 8 | 3 | 23.0 |
| 9 | 0.3.0 | | **Ship an online sandbox: a web page with two textboxes converting between ADF and markdown on the library's browser build.** | 2 | 6 | 6 | 8 | 3 | 21.0 |
| 38 | 0.3.0 | | **Spell a lone surrogate in a text node so it survives a UTF-8 encode.** | 2 | 2 | 4 | 7 | 1 | 19.5 |
| 47 | 0.3.0 | | **Open the README with what the package is, what it does and for whom.** | 1 | 4 | 7 | 9 | 9 | 14.0 |
| 34 | 0.3.0 | | **Read emphasis flanking by the whole character beside an astral symbol.** | 2 | 3 | 3 | 6 | 3, 4 | 12.6 |
| 42 | 0.3.0 | | **Trim a text leaf's trailing blanks in linear time.** | 1 | 2 | 5 | 9 | 8 | 12.5 |
| 48 | 0.3.0 | | **Keep the release path publishing past npm's bypass-2FA token retirement.** | 4 | 4 | 8 | 3 | 9 | 11.7 |
| 34 | 0.3.0 | | **Read emphasis flanking by the whole character beside an astral symbol.** | 2 | 3 | 3 | 6 | 4, 5 | 11.3 |
| 31 | 0.3.0 | | **Make the branch-coverage figure repeat across runs of an unchanged tree.** | 2 | 3 | 3 | 4 | 1 | 11.2 |
| 33 | 0.3.0 | | **Emit a line in time linear in its mark runs, in `adfToMarkdown` and `adfToPlainMarkdown`.** | 4 | 5 | 6 | 9 | 8 | 10.7 |
| 46 | 0.3.0 | | **Publish the bundle size in the README, failing the release pipeline when it drifts.** | 2 | 4 | 5 | 5 | 7, 9 | 10.3 |
| 9 | 0.3.0 | | **Ship an online sandbox: a web page with two textboxes converting between ADF and markdown on the library's browser build.** | 2 | 6 | 6 | 8 | 9 | 10.3 |
| 69 | 0.3.0 | question | **Decide whether `adfToPlainMarkdown` keeps a text node's `content`, and keep it or name the drop in the README.** | 2 | 2 | 3 | 5 | 6 | 7.9 |
| 42 | 0.3.0 | defect | **Trim a text leaf's trailing blanks in linear time.** | 1 | 2 | 5 | 9 | 9 | 10.5 |
| 33 | 0.3.0 | defect | **Emit a line in time linear in its mark runs, in `adfToMarkdown` and `adfToPlainMarkdown`.** | 4 | 5 | 6 | 9 | 9 | 8.7 |
| 56 | 0.3.0 | principle | **Give each piece of `blocks.ts`'s block-walk state and `inline-content.ts`'s `Scan` one owner that returns what it changes.** | 4 | 5 | 2 | 4 | 1 | 6.8 |
| 57 | 0.3.0 | principle | **Make each `ci.sh` leg build what it reads, so one leg run alone tests the current tree.** | 2 | 3 | 1 | 3 | 7 | 1.2 |
| 58 | 0.3.0 | principle | **Port `ci.sh`, `publish.sh` and `docker-runner.sh` to standalone Python scripts.** | 4 | 6 | 1 | 2 | 7 | -2.2 |
| 8 | 0.4.0 | | **Ship a CLI.** | 3 | 7 | 7 | 6 | 9 | 10.6 |
| 57 | 0.3.0 | principle | **Make each `ci.sh` leg build what it reads, so one leg run alone tests the current tree.** | 2 | 3 | 1 | 3 | 8 | 0.6 |
| 58 | 0.3.0 | principle | **Port `ci.sh`, `publish.sh` and `docker-runner.sh` to standalone Python scripts.** | 4 | 6 | 1 | 2 | 8 | -2.6 |
| 8 | 0.4.0 | | **Ship a CLI.** | 3 | 7 | 7 | 6 | 3 | 18.6 |
## Details
### 47. Open the README with what the package is, what it does and for whom.
Lands after item 72: the badges are npm's version and the GitHub Actions status. Today the README
opens with the pre-launch rationale — Atlassian's REST APIs, `pf-editor-service/convert` being
decommissioned, a link to JRACLOUD-77436. The background goes entirely, no endpoint, ticket or "why"
note left. The README names the lossy pair, `adfToPlainMarkdown` and `plainMarkdownToAdf`, and the
flavours it writes and reads — GitHub Flavored Markdown's alerts and task lists, Obsidian Flavored
Markdown's callouts — so a search for any of these names finds the package.
### 7. Ship HTML: `adfToHtml`, `htmlToAdf`, and `markdownToHtml` / `htmlToMarkdown` composed through ADF.
Lands after items 6, 59, 60, 61 and 62. The CommonMark spec suite also runs against
@@ -99,6 +110,15 @@ typed array in `attrs`, as `structuredClone` keeps it, passes the guard and is w
key per element: `ok: true` with content lost. Accept an object whose prototype is
`Object.prototype` or `null`, and an array. Found by the stability review of item 63, 2026-10-04.
### 71. Add a README table comparing the package with the other ADF converters, each cell checked against that package's own docs or behaviour.
Lands after items 7, 46 and 47: the table names HTML, compares item 46's size figure, and sits in
the README item 47 reshapes. Its columns: which directions each converts, whether the round-trip
holds, what an unknown node does, the formats, runtime dependencies and size. Candidates are the
packages an npm search for ADF and markdown returns, marklassian among them. Every cell cites that
package's README or a run against its published version, and the table names each version and the
date it was checked. Found while planning discoverability, 2026-10-04.
### 43. Give each markdown input its own reader, strict to its own standard.
Today `markdownToAdf` reads CommonMark and the lossless flavour as one input: text shaped like a
@@ -107,19 +127,6 @@ a code fence whose info string opens `adf:` becomes the block carry where Common
caller names the markdown it hands in: CommonMark, read as its spec says, or the lossless flavour,
read as `spec/flavour.md` says. Breaking: `MIGRATION.md` says which call a caller takes.
### 65. Read an image not alone in its paragraph as its alt text linked to its URL, and a titled image alone in its paragraph as the image captioned with its title.
Both are refused today with `unmappable-image`: 14 examples in
`corpus/commonmark-spec/refusals.json`, a bot's `See ![diagram](url) here` among them. `mediaInline`
takes only Atlassian media ids, never a URL. An image not alone in its paragraph reads as its alt
text, linked to its URL. Its title becomes the link's `title`. An empty alt text reads as the URL,
as item 50 reads an empty link. A titled image alone in its paragraph reads as the image, with its
title as a `caption` (the maintainer, 2026-10-04). By Goal 4, the lossless flavour reads both as
CommonMark does. An image inside a link: `[![moon](moon.jpg)](/uri)` (spec example 517). Alone in
its paragraph, it reads as the image with a `link` mark to `/uri`, which ADF's `media` takes. Not
alone in its paragraph, the image reads as its alt text linked to `/uri`, and its URL drops. A
writer panel chose this reading 3 of 3 (2026-10-04), by Goal 5, which outranks Goal 6.
### 68. Carry a non-text inline node holding `content` or `text`, a block holding `text`, and a leaf block holding `content`.
`refuseContentAndText` (`emit/inline-line.ts`) and `emitDirectiveBlock` (`emit/adf-to-markdown.ts`)
@@ -128,10 +135,46 @@ round-trips them; `docs/decisions.md` §The code list gives a cause the carry an
them from the emitting half of the README's `unsupported-node-shape` row. Found by the README-goals
audit, 2026-10-04.
### 65. Read an image not alone in its paragraph as its alt text linked to its URL, and a titled image alone in its paragraph as the image captioned with its title.
Both are refused today with `unmappable-image`: 14 examples in
`corpus/commonmark-spec/refusals.json`, a bot's `See ![diagram](url) here` among them. `mediaInline`
takes only Atlassian media ids, never a URL. An image not alone in its paragraph reads as its alt
text, linked to its URL. Its title becomes the link's `title`. An empty alt text reads as the URL,
as item 50 reads an empty link. A titled image alone in its paragraph reads as the image, with its
title as a `caption` (the maintainer, 2026-10-04). By Goal 5, the lossless flavour reads both as
CommonMark does. An image inside a link: `[![moon](moon.jpg)](/uri)` (spec example 517). Alone in
its paragraph, it reads as the image with a `link` mark to `/uri`, which ADF's `media` takes. Not
alone in its paragraph, the image reads as its alt text linked to `/uri`, and its URL drops. A
writer panel chose this reading 3 of 3 (2026-10-04), by Goal 6, which outranks Goal 7.
### 70. Give `package.json` the `keywords` someone searching npm for an ADF converter types.
`package.json` has none, and npm's search ranks on them. Take the terms the other ADF converters on
npm list and the names the README uses — ADF, Atlassian Document Format, markdown, CommonMark, HTML
— so a search for any of them can reach the package. Found while planning discoverability,
2026-10-04.
### 72. Make GitHub the canonical repository, with `gitea.larvit.se/larvit/adf-codec` a read-only pull mirror of it.
The maintainer's call, 2026-10-04: GitHub is where an ADF converter is searched for, and the Gitea
copy keeps the move back open. The workflows move to `.github/workflows/` with `ci.sh` unchanged.
Publishing moves to npm's trusted publishing over OIDC, which GitHub-hosted Actions support, and
which outlives the bypass-2FA token npm retires around January 2027: `publish.sh` drops `NPM_TOKEN`
for the Actions OIDC variables, and AGENTS.md §7 reserves the trusted-publisher setup in place of
the secret. `package.json`'s `repository` moves and it gains `bugs` and `homepage`. The links in
README, CHANGELOG and MIGRATION follow, as do AGENTS.md's forge commands and merge style.
`docs/decisions.md` gains the entry "GitHub is canonical, and Gitea a pull mirror of it" (Goal 3),
and §Public on npm and §Publish on a version bump are revised: the source is public on GitHub, and
CI publishes through npm's trusted publisher. Gitea's open issues and its releases move to GitHub
first, since a mirror carries only git refs; the mirror disables issues and its description points
at GitHub. Creating the GitHub repository, configuring npm's trusted publisher, and re-creating the
Gitea copy as a mirror (Gitea cannot convert an existing repository) are the maintainer's.
### 49. Read a list whose bullet or ordered delimiter changes as two lists, in both readers, and retire `!adf:listBreak`.
Lands after item 43. Today `- a` then `+ b`, or `1.` then `1)`, reads as one list; CommonMark reads
two (spec examples 301 and 302). Goal 4 settles it for the lossless flavour too: CommonMark spells
two (spec examples 301 and 302). Goal 5 settles it for the lossless flavour too: CommonMark spells
adjacent lists by changing the marker, so `adfToMarkdown` and `adfToPlainMarkdown` alternate `-` and
`*` between adjacent bullet lists and `.` and `)` between adjacent ordered lists, and
`!adf:listBreak` retires. `*` is the maintainer's pick (2026-10-04). Breaking, so it ships beside
@@ -139,6 +182,16 @@ item 43: `MIGRATION.md`'s Readings and Spellings tables gain their rows. Example
their `pending` exceptions, and the spelling leaves the README's "Four CommonMark spellings" bullet,
which counts one fewer.
### 46. Publish the bundle size in the README, failing the release pipeline when it drifts.
Lands after item 7, which changes it. The quantity is what a consumer downloads and loads: the
tarball `npm pack` produces, its unpacked `dist`, and the built JavaScript minified + gzipped — the
figure the competitors advertise (marklassian's "12kb") and the only apples-to-apples one, since
ours ships tsc's unminified output and no minifier yet (decide here whether to minify for the build
or report the unminified gzip). The figure lands in README §The package beside the "no runtime
dependencies" claim. Measured today, unminified: tarball 60.4 kB, unpacked 221.5 kB, JS gzipped 45.6
kB.
### 61. Have the emitter ask the inline reader how a line reads back, in place of `line-escaping.ts` predicting it.
The comprehension panel's worst place: `escapeClaims` and `escapeClosedRuns` re-implement the
@@ -159,12 +212,6 @@ example 540); lowercasing and then uppercasing folds it. Breaking, so it ships b
`MIGRATION.md`'s Readings table gains its row. Its `pending` exceptions go, and its spelling leaves
the README's "Four CommonMark spellings" bullet, which counts one fewer.
### 53. Put a block's `marks` spelling to the writer panel and adopt its pick.
Today `marks="[{\"attrs\":{\"mode\":\"wide\"},\"type\":\"breakout\"}]"`, the marks array as
escaped JSON. Breaking where the panel picks another spelling: `MIGRATION.md`'s Spellings table
gains its row.
### 60. Collect the questions `parse/` asks `emit/` into one named module.
`parse/` asks `emit/` through `commonMarkSpelling` and `openingLinkTakesDirective`, each imported
@@ -177,14 +224,11 @@ Eight directive files sit across three directories, and the `markdown/` root hol
needs `Read<T>` and `Flavour` out of the plain flavour and `markdown/`; it needs the carry and the
mark spellings too, which item 7 moves where it learns what HTML shares.
### 50. Read `[](/url)` and `[]()` as CommonMark's empty link.
### 53. Put a block's `marks` spelling to the writer panel and adopt its pick.
Both stay literal text today (spec examples 484 and 487). ADF holds no empty text node to carry a
link mark, so a link whose text is empty takes its URL as its text (the maintainer, 2026-10-04):
`[](/url)` reads as `/url` linked to `/url`. `[]()` has no URL to show; the chunk settles it by Goals
3 and 6. Breaking, so it ships beside item 43: `MIGRATION.md`'s Readings table gains its row. Its
`pending` exceptions go, and its spelling leaves the README's "Four CommonMark spellings" bullet,
which counts one fewer.
Today `marks="[{\"attrs\":{\"mode\":\"wide\"},\"type\":\"breakout\"}]"`, the marks array as
escaped JSON. Breaking where the panel picks another spelling: `MIGRATION.md`'s Spellings table
gains its row.
### 62. Move the plain flavour's reading out of `parse/` and its writing out of `emit/` into `markdown/plain/`, so `emit/` no longer imports `plain/`.
@@ -194,46 +238,32 @@ the `inlineLeaves` use. Writing: `spellPlainBlock`, `quotedUnder`, `tryTaskList`
`plain/conventions.ts`, which `emit/` imports them from; item 59 moves `Flavour`. Every
comprehension reader on 2026-10-03 named the plain flavour's spread across three directories.
### 50. Read `[](/url)` and `[]()` as CommonMark's empty link.
Both stay literal text today (spec examples 484 and 487). ADF holds no empty text node to carry a
link mark, so a link whose text is empty takes its URL as its text (the maintainer, 2026-10-04):
`[](/url)` reads as `/url` linked to `/url`. `[]()` has no URL to show; the chunk settles it by Goals
4 and 7. Breaking, so it ships beside item 43: `MIGRATION.md`'s Readings table gains its row. Its
`pending` exceptions go, and its spelling leaves the README's "Four CommonMark spellings" bullet,
which counts one fewer.
### 73. Announce the package where someone needing an ADF converter already reads: JRACLOUD-77436, the Atlassian developer community and Stack Overflow's ADF-to-markdown questions.
Lands after `0.2.0` is published with items 47, 71 and 72, so each post links the GitHub repository,
the comparison and a README that opens with what the package is. We draft each post for the place it
goes; the maintainer posts them. Found while planning discoverability, 2026-10-04.
### 38. Spell a lone surrogate in a text node so it survives a UTF-8 encode.
`adfToMarkdown` emits it verbatim, so markdown stored as UTF-8 reads back U+FFFD; attribute values
already escape it.
### 47. Open the README with what the package is, what it does and for whom.
It opens with the pre-launch rationale — Atlassian's REST APIs, `pf-editor-service/convert` being
decommissioned, a link to JRACLOUD-77436. The background goes entirely, no endpoint, ticket or "why"
note left. The badges are npm's version and the Gitea Actions status. The README names the lossy
pair, `adfToPlainMarkdown` and `plainMarkdownToAdf`, and the flavours it writes and reads — GitHub
Flavored Markdown's alerts and task lists, Obsidian Flavored Markdown's callouts — so a search for
any of these names finds the package.
### 34. Read emphasis flanking by the whole character beside an astral symbol.
Check whether `line-escaping.ts`'s `charAt` and the parser's flanking read one UTF-16 unit beside an
astral symbol — a lone surrogate is neither punctuation nor symbol, where CommonMark reads `😀` as
punctuation — and, where they do, read the code point, with a fixture per direction.
### 42. Trim a text leaf's trailing blanks in linear time.
`plain/inline-reduction.ts`'s `leafEdges` finds the trail with an unanchored `/[ \t]*$/`, quadratic
in a run of blanks inside one leaf: a paragraph of `a`, 80 000 spaces, `b` takes 6.5 s in
`adfToPlainMarkdown`. Scan backward, as the expand title's trim does.
### 48. Keep the release path publishing past npm's bypass-2FA token retirement.
Lands after 2027-01-01, or after a release run fails on the token, whichever comes first: the
maintainer chose on 2026-10-02 to wait and see whether the retirement bites. It holds back no
release: when the rest of its release is done, it moves to the next. `0.1.0` published only once the
npm token carried **Bypass 2FA**: the account requiring no 2FA on writes was not enough, and npm
answered `EOTP` until the token itself bypassed. npm retires bypass-2FA tokens for direct publishing
around January 2027, leaving them `npm stage publish`, which a maintainer approves with 2FA; its
replacement — trusted publishing over OIDC — supports GitHub-hosted Actions, GitLab.com's shared
runners and CircleCI's cloud, self-hosted runners planned without a date. Revisit: whether npm has
added Gitea or self-hosted OIDC, and otherwise whether the release moves to the staged publish —
which fits badly with publish-on-merge, and is the maintainer's trade to weigh. The Goals and G
cells are provisional: no README goal covers the release path.
### 31. Make the branch-coverage figure repeat across runs of an unchanged tree.
Three Node test legs over one unchanged tree reported `emit/inline-line.ts` at 95.83%, 96.23% and
@@ -245,6 +275,12 @@ moves upward, so the first raise to the measured figure reddens a run that chang
measurement repeatable, or state the number the floor may be raised to and why it is not the
measured one.
### 42. Trim a text leaf's trailing blanks in linear time.
`plain/inline-reduction.ts`'s `leafEdges` finds the trail with an unanchored `/[ \t]*$/`, quadratic
in a run of blanks inside one leaf: a paragraph of `a`, 80 000 spaces, `b` takes 6.5 s in
`adfToPlainMarkdown`. Scan backward, as the expand title's trim does.
### 33. Emit a line in time linear in its mark runs, in `adfToMarkdown` and `adfToPlainMarkdown`.
`adfToMarkdown` spends 23 s on one paragraph of 2000 × `un` plus `**-r**`: each run its flanking
@@ -253,26 +289,6 @@ reduction's `spellableLine` drops one mark per re-emit the same way. An inline n
attributes no spelling writes re-emits the line the same way before riding the carry. Make all
three linear.
### 46. Publish the bundle size in the README, failing the release pipeline when it drifts.
Lands after item 7, which changes it. The quantity is what a consumer downloads and loads: the
tarball `npm pack` produces, its unpacked `dist`, and the built JavaScript minified + gzipped — the
figure the competitors advertise (marklassian's "12kb") and the only apples-to-apples one, since
ours ships tsc's unminified output and no minifier yet (decide here whether to minify for the build
or report the unminified gzip). The figure lands in README §The package beside the "no runtime
dependencies" claim. Measured today, unminified: tarball 60.4 kB, unpacked 221.5 kB, JS gzipped 45.6
kB.
### 69. Decide whether `adfToPlainMarkdown` keeps a text node's `content`, and keep it or name the drop in the README.
`nodeLeaves` (`plain/inline-reduction.ts`) keeps only a text node's `text`, so
`{ text: 'a', content: [{ text: 'kept', type: 'text' }] }` writes `a`, though `toEditorNormal`
keeps that content (`plain/editor-normal.ts`) and an unknown node's children keep their text.
Atlassian's schema allows no `content` on a text node, so no Atlassian reader saw it; an
export/indexing tool fed a looser producer loses searchable text. Goal 6 reads two ways here: keep
the children's text as an unknown node's, or name the drop in the README's plain section. Found by
the product-owner review, 2026-10-04.
### 56. Give each piece of `blocks.ts`'s block-walk state and `inline-content.ts`'s `Scan` one owner that returns what it changes.
Technical principle "One owner per value": the `Walk` record passes through twelve functions that