[BUG] Windows-style environment variables in npm scripts are no longer expanded

[ehoogeveen-medweb]

Current Behavior:

Our setup uses environment variables to pass parameters to npm scripts. With npm v7, Windows-style environment variables like %foo% are no longer expanded (on Windows).

Expected Behavior:

Windows-style environment variables used by npm scripts should be expanded (on Windows) like they are with npm v6. Alternatively, Unix-style environment variables should be made to work on Windows.

Steps To Reproduce:

1. From a clean node project,
2. Set the test script in package.json to "echo %HelloWorld%"
3. In a command prompt, set the environment variable using set "HelloWorld=Hello world!"
4. Run the script using npm run test
5. With npm v7, the output is %HelloWorld% instead of Hello world!.

Environment:

• OS: Windows 10 20H2
• Node: 14.15.5
• npm: 7.5.4

[darcyclarke]

In-Review PR to resolve this: npm/run-script#22

[ehoogeveen-medweb]

I can confirm that windows-style environment variables work again with npm v7.7.0 (which includes @npmcli/run-script v1.8.4), thanks!