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docs(fs-local): a null before-image still renders a whole-file diff card

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The writeText comment still said a null `before` (a create or an
undiffable binary file) means "a consumer renders no result-time diff,
only the call-time whole-file card." That is stale since write's
presentResult renders a whole-file diff for a null before-image. Correct
it: a null `before` gives no contextual-hunk basis, so the consumer falls
back to a whole-file diff — the tool still renders a result diff card, not
the raw result text.
This commit is contained in:
Tianyi Cui
2026-07-03 21:38:42 +08:00
parent 86457689fc
commit d753660d66
1 changed files with 3 additions and 2 deletions
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5
packages/fs/fs-local/src/index.ts
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@@ -148,8 +148,9 @@ export class LocalFileSystem extends FileSystem {
// Capture the prior text (the before/after diff basis) BEFORE the write.
// `null` for a create (no existing file) OR an existing-but-undiffable
// file (binary/invalid-UTF-8) — a consumer renders no result-time diff for
// either, only the call-time whole-file card.
// file (binary/invalid-UTF-8) — a null `before` gives no contextual-hunk
// basis, so a consumer falls back to a whole-file diff (the tool still
// renders a result-time diff card, not the raw result text).
const before = existing ? await readTextForDiff(target.targetKey, signal) : null
await writeFileAtomic(target.targetKey, content, existing?.mode, signal, this.internals)
const after = await probe(target.targetKey)