feat(turbo): COREPACK_HOME to default passthrough #9151
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chris-olszewski
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## Problem Turborepo does not pass `COREPACK_HOME` to internal libraries. This means Turborepo projects using corepack may run into `EEXIST: file already exists` errors. [turbo@2.1.3 has `COREPACK_HOME` in default passthrough](vercel/turborepo#9151), but we need to handle older existing Turborepo projects better for a couple reasons: 1. New Turborepo projects can be created today that use corepack, and they can hit this confusing `EEXIST` error. 2. We want to fix corepack detection in monorepos without breaking existing Turborepo projects again. a. #12099 ## Solution When a Turborepo project does not support `COREPACK_HOME`, we disable corepack. Projects that need corepack disabled have the following criteria: - Use turbopack (detected by having `turbo` in `package.json#devDependencies`) - Use a turbo version lower than 2.1.3 (using the minimum of the range in `package.json#devDependencies.turbo`) - Do not include `COREPACK_HOME` in `turbo.json#globalPassThroughEnv` In the case we disable corepack, we display a helpful warning telling users how to fix their project: "Warning: Disabling corepack because it may break your project. To use corepack, either upgrade to `turbo@2.1.3+` or include `COREPACK_HOME` in `turbo.json#globalPassThroughEnv`."
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Description
Add
COREPACK_HOMEto default passthrough listTesting Instructions