The Prisma 8 language server ignores documents without the use prisma-next directive

[StevenMcClankerton]

Linked issue

n/a — no Linear ticket. Part of the extension routing model where both the legacy (Prisma ≤7) and Prisma 8 language servers receive document sync for all .prisma files and each decides ownership locally; the legacy server's half is already implemented in prisma/language-tools.

At a glance

// packages/1-framework/3-tooling/language-server/src/schema-directive.ts
const PRISMA_NEXT_DIRECTIVE = /^\s*\/\/ *use +prisma-next *(?!\S)/;

export function isPrismaNextSchema(text: string): boolean {
  return PRISMA_NEXT_DIRECTIVE.test(text);
}

A document whose first non-whitespace content is a // use prisma-next line comment is this server's responsibility; everything else belongs to the legacy server and is now ignored — feature requests return the protocol's empty result, and the push path publishes an empty diagnostics array (not nothing), so an edit that removes the directive clears this server's stale squiggles as ownership flips back mid-edit. Before this PR, the server diagnosed every configured input regardless of the directive.

Decision

prisma lsp decides per request, from current document content, whether a document is a Prisma Next schema:

1. One ownership gate at the artifacts seam. computeDocumentDiagnostics — the existing "do we own this document" decision that already returns null for non-configured inputs — now also returns null when the text lacks the directive. Every feature path (push/pull diagnostics, completion, semantic tokens, folding) and multi-file schema composition reads through this seam, so one check covers them all.
2. No caching of ownership. The regex is re-tested lazily from the current text at each publish/request, so adding or removing the directive flips ownership immediately in both directions. Document sync itself is untouched — unmarked documents stay tracked.
3. A local copy of the shared convention. The regex is the only coupling with the legacy server; it must stay byte-for-byte in sync with the copy in prisma/language-tools. This server does not import, spawn, or proxy to the legacy server.

Reviewer notes

• The bulk of the diff is test-source churn, not behavior. Every pre-existing test schema gained the directive line, which shifted line-sensitive expectations: semantic-token arrays gained the leading comment token (0, 0, 18, 9, 0) plus a line delta, formatting ranges grew a line, and the fabricated interpreter-diagnostic spans moved by the 19-character directive line (interpreter mapping is offset-based). The new behavior is concentrated in the prisma-next directive gating describe at the end of test/server.test.ts.
• Unconfigured documents still publish nothing at all (pre-existing, still asserted). The explicit empty publish applies to configured inputs without the directive — the only case where this server could have stale markers to clear.
• getProjectSymbolTable now guards instead of throwing. With gating, a project can have open configured inputs that are all unmarked; the public accessor returns undefined for a document without artifacts rather than reaching the "no readable configured input" invariant throw in src/project-artifacts.ts. Internal callers (completion, semantic tokens) already only read the symbol table after confirming the requested document's artifacts.
• By the regex's own grammar, // use prisma-next extra words matches (the lookahead only rejects a token attached to prisma-next, e.g. prisma-nextgen). That behavior is pinned in test/schema-directive.test.ts so a well-meaning "fix" can't silently desync us from the legacy server.
• The lsp-playground sample fixture gained the directive so the playground keeps demonstrating live diagnostics.

How it fits together

1. The directive helper (src/schema-directive.ts) holds the regex and isPrismaNextSchema.
2. The gate lands in src/document-diagnostics.ts: an unmarked configured input computes to null, exactly like a non-input. The project artifacts store therefore never caches artifacts for unmarked documents, which is what makes the check lazy — documentChanged drops the cache and the next read re-tests the current text.
3. Everything downstream falls out of the seam. The push path already publishes [] when a tracked document has no artifacts; pull reports, completion, semantic tokens, and folding already return their empty results; and symbolTable() composition skips inputs that yield no artifacts, so an unmarked sibling never becomes part of a Prisma Next schema.
4. Formatting is the one path that bypasses the store (it formats raw buffer text), so src/server.ts re-tests the directive there before formatting — a document the legacy server owns must not be reformatted by this server.

Behavior changes & evidence

• A configured input without the directive gets an explicit empty diagnostics publish on open and on every change, and empty results for completion, semantic tokens, folding, formatting, and pull diagnostics (src/document-diagnostics.ts; evidence: prisma-next directive gating in test/server.test.ts).
• An edit that removes the directive from a handled document publishes empty diagnostics and stops answering feature requests; an edit that adds it starts diagnosing from the edited content (test/server.test.ts).
• With a marked and an unmarked file open in the same project, the unmarked file is excluded from schema composition — the project symbol table contains only the marked file's models (src/project-artifacts.ts; evidence: test/project-artifacts.test.ts).
• The directive grammar itself — leading blank lines and flexible spacing accepted, attached tokens and block comments rejected — is pinned in test/schema-directive.test.ts.
• The package README (README.md) is trimmed to a short description and now states the directive-ownership rule up front.

Testing performed

• pnpm test in @internal/language-server — 292 tests, 15 files, all green (includes the new gating suites).
• pnpm typecheck and pnpm lint in the package (lint output identical to baseline).
• pnpm lint:deps at the root.
• pnpm test:packages at the root — 1171 files passed; the 5 failing tarball-packaging smoke tests (pnpm pack/pnpm install in temp dirs) reproduce identically on a clean checkout and are unrelated.

Skill update

n/a — no skill under packages/0-shared/skills/ documents language-server behavior; the ownership model is documented in the package README instead.

Alternatives considered

• Gating in each request handler instead of at the artifacts seam — would need five-plus checks that drift independently; the seam already models "document we own" via its null return, so ownership stays a single decision.
• Caching an "owned" flag on open/change — a cached flag can go stale across edits and config reloads; the regex test is one cheap call per event, so lazy re-evaluation from current text is both simpler and correct by construction.
• Publishing nothing for unmarked configured inputs — publishing an explicit empty array is what clears stale squiggles when an edit removes the directive mid-session; silence would leave this server's markers stranded while the legacy server takes over.
• Sharing the regex via a common package with the legacy server — rejected up front: this server must not depend on the legacy server in any way. The shared directive convention is the only coupling, hence a local copy of the regex.

Checklist

• All commits are signed off (git commit -s) per the DCO. The DCO status check will block merge if any commit is missing a Signed-off-by: trailer.
• I read CONTRIBUTING.md and the change is scoped to one logical concern.
• Tests are updated (or n/a if the change is doc-only / refactor with no behavioural delta).
• The PR title is in TML-NNNN: <sentence-case title> form — no Linear ticket exists for this change; the title is a plain sentence-case description.
• The Skill update section above is filled in (or stated n/a — internal only).

Summary by CodeRabbit

• New Features

  • Added opt-in schema processing through the // use prisma-next directive.
  • Unmarked documents are excluded from diagnostics, formatting, tokens, folding, AST results, and symbol tables.
  • Adding or removing the directive updates language-server processing automatically.

• Bug Fixes

  • Prevented unmarked sibling documents from affecting schema composition.

• Tests

  • Added comprehensive coverage for directive detection and language-server behavior.

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commit: 6f62ef9

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• packages/1-framework/3-tooling/language-server/src/document-diagnostics.ts
• packages/1-framework/3-tooling/language-server/src/schema-directive.ts
• packages/1-framework/3-tooling/language-server/src/server.ts
• packages/1-framework/3-tooling/language-server/test/schema-directive.test.ts

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---

📝 Walkthrough

Walkthrough

The language server now recognizes // use prisma-next ownership, ignores unmarked documents, gates diagnostics and formatting, limits symbol-table access to managed documents, and adds directive coverage across language features and lifecycle tests.

Changes

Directive ownership

Layer / File(s)	Summary
Directive contract and documentation packages/1-framework/3-tooling/language-server/src/schema-directive.ts, packages/1-framework/3-tooling/language-server/test/schema-directive.test.ts, packages/1-framework/3-tooling/language-server/README.md, apps/lsp-playground/fixtures/broken.psl	Adds whitespace-tolerant detection for the standalone // use prisma-next directive. Documents ownership rules and updates the playground fixture.
Runtime ownership gates packages/1-framework/3-tooling/language-server/src/document-diagnostics.ts, packages/1-framework/3-tooling/language-server/src/server.ts, packages/1-framework/3-tooling/language-server/src/project-artifacts.ts, packages/1-framework/3-tooling/language-server/test/document-diagnostics.test.ts, packages/1-framework/3-tooling/language-server/test/project-artifacts.test.ts	Skips diagnostics and formatting for unmarked documents. Returns symbol tables only for documents with readable artifacts. Updates related tests and invariant wording.
Server feature and lifecycle coverage packages/1-framework/3-tooling/language-server/test/server.test.ts	Adds directive markers to existing fixtures and verifies gating for diagnostics, formatting, completion, tokens, folding, AST, symbol tables, edits, project changes, and sibling composition.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to 6f62e

The PR routes documents based on the use prisma-next directive and clears or enables language features as ownership changes. A tab-separated trailing token may still be treated as a valid directive, potentially sending a legacy document to the wrong server; the change is otherwise mergeable with explicit owner follow-up.

Sequence Diagram(s)

sequenceDiagram
  participant LanguageClient
  participant LanguageServer
  participant isPrismaNextSchema
  participant runPipeline
  participant ProjectArtifacts

  LanguageClient->>LanguageServer: request document feature
  LanguageServer->>isPrismaNextSchema: inspect current source
  isPrismaNextSchema-->>LanguageServer: marked or unmarked
  alt marked document
    LanguageServer->>runPipeline: compute language result
    runPipeline->>ProjectArtifacts: update document artifacts
    ProjectArtifacts-->>LanguageServer: artifacts and symbols
    LanguageServer-->>LanguageClient: feature result
  else unmarked document
    LanguageServer-->>LanguageClient: empty result or no diagnostics
  end

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 14.29% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 10 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

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Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: the Prisma 8 language server ignores documents without the use prisma-next directive.

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Actionable comments posted: 1

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Inline comments:
In `@packages/1-framework/3-tooling/language-server/src/prisma-next-directive.ts`:
- Line 1: Update PRISMA_NEXT_DIRECTIVE so it accepts only optional horizontal
whitespace after prisma-next and rejects any trailing token, including
tab-separated suffixes; add a regression test through isPrismaNextSchema for “//
use prisma-next\tlegacy”.

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size-limit report 📦

Path	Size
postgres / no-emit	174.86 KB (0%)
postgres / emit	152.08 KB (0%)
mongo / no-emit	101.09 KB (0%)
mongo / emit	90.95 KB (0%)
cf-worker / no-emit	198.74 KB (0%)
cf-worker / emit	173.36 KB (0%)

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Actionable comments posted: 1

🧹 Nitpick comments (1)

packages/1-framework/3-tooling/language-server/README.md (1)

9-11: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Preserve the language-server-specific architecture details.

ADR 242 covers package location and distribution. The toolchain README covers aggregate dependencies and entrypoints. Neither replaces the language server’s How it works or Module layout sections, nor its complete dependency list. Retain those sections or move them to a canonical document and link to it.

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In `@packages/1-framework/3-tooling/language-server/README.md` around lines 9 -
11, Restore the language server README’s “How it works,” “Module layout,” and
complete dependency details, or move them to a canonical document and link to it
from this README; retain the existing responsibilities content and avoid relying
solely on ADR 242 or the toolchain README.

Source: Coding guidelines

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Inline comments:
In `@packages/1-framework/3-tooling/language-server/README.md`:
- Line 11: Update the language-server capability description to clearly state
that PSL inputs are configured, open, and carry the directive, replacing the
ambiguous “open configured PSL inputs” wording while preserving the rest of the
sentence.

---

Nitpick comments:
In `@packages/1-framework/3-tooling/language-server/README.md`:
- Around line 9-11: Restore the language server README’s “How it works,” “Module
layout,” and complete dependency details, or move them to a canonical document
and link to it from this README; retain the existing responsibilities content
and avoid relying solely on ADR 242 or the toolchain README.

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