ESLint v0.21.2
Relevant code: (#config.js#84)

Expected:

Multiple, scoped, shared configs in a single module should be extendable from a .eslintrc without the eslint-config- prefix (as non-scoped configs are).

Assuming a module called eslint-config-test with a default config index.js and a sub-config modern.js then all of these should work:

{ "extends": "@scope/eslint-config-test" }

{ "extends": "@scope/eslint-config-test/modern" }

{ "extends": "@scope/test" }

{ "extends": "@scope/test/modern" }

Actual:

The 4th example, extending a sub-config, will fail with the error Cannot find module '@scope/test/eslint-config-modern' unless the root module name includes the eslint-config- prefix.

These will work:

{ "extends": "@scope/test" }

{ "extends": "@scope/eslint-config-test/modern" }