Rename the engine's defineConfig to definePrismaConfig

[wmadden-electric]

What

Every command family ships a config helper named defineConfig — the engine's (prisma.config.ts wrapper), the ORM's (@prisma/orm-postgres/config), composer's (@prisma/composer/config). A prisma.config.ts that composes two of them has to alias imports (import { defineConfig as ormConfig } ...). This gives the engine's helper a unique name: definePrismaConfig.

• defineConfig stays exported as a deprecated alias, so existing configs and the pinned family packages (orm-toolchain, composer, which bundle their own engine copies) keep working unchanged.
• The CLI's own error prose (CLI.CONFIG_MISSING_MARKER, CLI.CONFIG_VERSION_UNSUPPORTED) now names definePrismaConfig.
• Internal fixtures and tests migrated; a regression test pins the alias.

Cross-repo follow-ups (not this PR)

The same de-aliasing needs the other two helpers renamed in their own repos: defineOrmConfig in prisma/prisma's @prisma/orm-* config packages, and defineComposerConfig in @prisma/composer/config. (defineComputeConfig is already unique.)

Testing

pnpm test (1,791 green), pnpm lint, pnpm typecheck all clean.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 55193f7 and 6f01ae0.

📒 Files selected for processing (15)

• packages/cli-engine/src/config-loader.ts
• packages/cli-engine/src/exports/index.ts
• packages/cli-engine/tests/config.test.ts
• packages/cli-engine/tests/engine.test.ts
• packages/cli-engine/tests/fixtures/config/env-block/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/env-overlay/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/extends-key/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/extends-remote/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/marked/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/meta-key/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/named/elsewhere.config.ts
• packages/cli-engine/tests/fixtures/config/passthrough/prisma.config.ts
• packages/cli-engine/tests/fixtures/config/proto-key/prisma.config.ts
• packages/cli/tests/fixtures/config/composer-section.config.ts
• packages/cli/tests/fixtures/config/elsewhere.config.ts

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commit: 6f01ae0