Add new option to prevent setting process.env.NODE_ENV

[Dunqing]

Clear and concise description of the problem

I want to prevent vitest from setting process.env.NODE_ENV.

Because vite supports setting process.env.NODE_ENV in env files, e.g. .env files. But vite only allows setting when process.env.NODE_ENV is undefined.

I want to prevent vitest set NODE_ENV.

Because vite support process.env.NODE_ENV set in env file, e.g: .env file. but vite only allow to set when process.env.NODE_ENV is undefined

Related code

vitest/packages/vitest/src/node/cli-api.ts

Line 18 in 4701e0b

process.env.NODE_ENV ??= options.mode || 'test'

Related pr:

vitejs/vite#8218

Suggested solution

Add preventSetNodeEnv option, default is false.
Don't set process.env.NODE_ENV when preventSetNodeEnv is true.

Alternative

No response

Additional context

vitejs/vite#8218 (comment)

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[sheremet-va]

Your examples shows that NODE_ENV is not set, if it was already set. So, what is the problem here?

[Dunqing]

If it is already set, causing NODE_ENV in the env file to not work.

https://github.com/vitejs/vite/pull/8218/files#diff-11e17761d4ecfee8f8fde15c6d79b7bc0260176396a30dfd8e6f6bbaf5af4745R399

[Dunqing]

I found the workaround.
We can override process.env.NODE_ENV with the env option.

vitest/packages/vitest/src/node/cli-api.ts

Lines 35 to 36 in 4701e0b

	if (ctx.config.env)
	Object.assign(process.env, ctx.config.env)