feat(engine): ctx.configFile tells a command which prisma.config.ts the run read

[wmadden-electric]

At a glance

A command handler can now ask which config file the run read:

defineCommand({
  needs: { config: ormSection },
  handler: async (args, ctx) => {
    ctx.cwd;        // where the user ran the command, as before
    ctx.configFile; // NEW: absolute path of the prisma.config.ts the engine loaded, or null
    const projectDir = dirname(ctx.configFile ?? ctx.cwd);
    // resolve the config's relative paths against projectDir, not ctx.cwd
  },
});

Invocation	ctx.cwd	ctx.configFile
prisma x from /app	/app	/app/prisma.config.ts
prisma x --config ./sub/prisma.config.ts	/app	/app/sub/prisma.config.ts
prisma x --config /etc/p/prisma.config.ts	/app	/etc/p/prisma.config.ts
any command with no needs.config	/app	null (the file is never read)

The decision

A relative path inside prisma.config.ts is relative to that file's directory, whichever directory the command runs from. To honour that, a handler has to know which file the engine loaded, so the command context carries it. The engine only reports the path; resolving the paths inside the config stays the command family's job, because only the family knows which of its config fields are paths.

The bug this fixes

The ORM's commands, mounted in this CLI from @prisma/orm-toolchain, resolve the relative paths in their config section before running. They could only see ctx.cwd, so they resolved against the working directory. Verified with prisma 8.0.0-rc.13 and @prisma/orm-toolchain 8.0.0-rc.8:

exp/
  sub/
    prisma.config.ts   # contract: './contract.prisma'
    contract.prisma

From exp/sub, prisma contract emit --config ./prisma.config.ts writes exp/sub/contract.json. From exp, prisma contract emit --config ./sub/prisma.config.ts fails with CONTRACT.SOURCE_LOAD_FAILED because it looks for exp/contract.prisma. The same file meant different things depending on where the command ran. The ORM's own standalone bin, Prisma Composer and prisma dev all anchor on the config file, so this CLI was the odd one out.

What changes

CommandContext.configFile: string | null. With --config, the flag's value resolved against runtime.cwd. Without it, the discovered prisma.config.ts in runtime.cwd. Null when the command declares no config need, in which case the engine never touches the file. The server command context gets the same field.

The engine resolves the path itself. Runtime.loadConfig returns the path it read, and the real loader already reports it absolute. A host that wires its own loader, and every test fixture in this repo, may echo the --config value verbatim, so the needs check resolves the reported path against runtime.cwd before it reaches the handler. For the real loader this is a no-op.

Engine 0.4.0 → 0.5.0. A published engine version is immutable, so a changed engine claims a new version (pnpm bump-cli-engine-version minor, the same bump #260 used for its context change). The shell and prisma package pins move with it.

Tests

New ctx.configFile block in packages/cli-engine/tests/config.test.ts, run through the in-memory harness. All four failed to compile before the change.

• A --config path given relative to cwd arrives absolute.
• Without the flag, the discovered file is <cwd>/prisma.config.ts (new fixture tests/fixtures/config/discovered).
• A host loader that reports a relative path is resolved against cwd.
• A command with no config need gets null, and the loader is never called.

pnpm --filter @prisma/cli-engine test: 38 files, 893 tests. Repository typecheck and lint pass.

Status

Approved. All checks pass except Test, which fails in the conformance step: @prisma/composer-cli and @prisma/orm-toolchain peer on @prisma/cli-engine@0.4.0 while the shell now ships 0.5.0. That is the skew window ADR 0004 describes: the families can only move their peer once 0.5.0 exists on the registry, and the check cannot pass until they have. How #260 cleared the same window is not visible any more (its logs have expired), so the sequencing of merge → publish 0.5.0 → family releases → update-product-versions PR needs an operator call.

The consumer side is prisma/orm#30328, which anchors the ORM's config paths on dirname(ctx.configFile) and waits on the 0.5.0 release.

Alternatives considered

• Have the engine resolve relative paths in the config. Rejected. The engine hands sections over opaquely and does not know which fields are paths; each family owns that knowledge, so it owns the resolution.
• Expose the raw --config flag value instead of a resolved path. Rejected. Every handler would repeat the resolution against cwd and the discovery fallback, and a handler should never need to know whether the file was named or discovered.
• Put the path on ctx.config itself. Rejected. ctx.config is exactly the validated section value the family's validator returned; adding an engine field to it would break TConfig typing.
• Ship without bumping the engine version. Refused by the engine-version check, and rightly: prisma@8.0.0-rc.4 crashed on import when a changed engine shipped under an already-published version.

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---

Summary by CodeRabbit

• New Features

  • Command handlers now expose the absolute path of the configuration file used for the current run.
  • Configuration paths are resolved consistently for explicit, discovered, and host-provided configuration files.
  • Commands that do not require configuration report no configuration file path.
  • Configuration file paths are also available through command execution context.

• Tests

  • Added coverage for explicit, discovered, relative, host-provided, and configuration-free command scenarios.

Walkthrough

The CLI engine now exposes configFile on CommandContext and server handler IO. Needs checking returns an absolute config path when configuration is loaded, or null when no configuration is required. Execution passes this value to mounted and server commands. Tests cover explicit paths, discovery, relative loader paths, and commands without configuration needs.

Priority: ⬇️ Low

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 7 files. (3 skipped: 3…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly and concisely describes the main change: exposing the configuration file path through ctx.configFile.
Description check	✅ Passed	The description directly explains ctx.configFile, path resolution behavior, implementation changes, tests, versioning, and known release sequencing details.

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 6 functions across 7 files. (3 skipped: 3 unsupported.)

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🔵 Trivial · Add a server-command config propagation regression test. · engine.ts:724-749

packages/cli-engine/src/execution/engine.ts:724-749
🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Add a server-command config propagation regression test.

The existing config tests use defineCommand, and the server tests do not declare needs.config or assert io.config and io.configFile. They would pass if executeServer omitted, nulled, or mis-forwarded needsOutcome.configFile.

Add a defineServerCommand test with needs.config, a deterministic loader, and exact assertions for both values. Do not use --config; server commands do not inject shared flags.

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In `@packages/cli-engine/src/execution/engine.ts` around lines 724 - 749, Add a
regression test for executeServer using defineServerCommand with needs.config
and a deterministic config loader, without passing --config. Assert that the
handler receives the exact expected values through io.config and io.configFile,
covering propagation from needsOutcome.config and needsOutcome.configFile.

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Outside diff comments:
In `@packages/cli-engine/src/execution/engine.ts`:
- Around line 724-749: Add a regression test for executeServer using
defineServerCommand with needs.config and a deterministic config loader, without
passing --config. Assert that the handler receives the exact expected values
through io.config and io.configFile, covering propagation from
needsOutcome.config and needsOutcome.configFile.

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