sourcekit-lsp/Documentation/Environment Variables.md

Environment variables

The following environment variables can be used to control some behavior in SourceKit-LSP

Build time

• SOURCEKITLSP_FORCE_NON_DARWIN_LOGGER: Use the NonDarwinLogger to log to stderr, even when building SourceKit-LSP on macOS. This is useful when running tests using swift test because it writes the log messages to stderr, which is displayed during the swift test invocation.
• SOURCEKIT_LSP_CI_INSTALL: Modifies rpaths in a way that’s necessary to build SourceKit-LSP to be included in a distributed toolchain. Should not be used locally.
• SWIFTCI_USE_LOCAL_DEPS: Assume that all of SourceKit-LSP’s dependencies are checked out next to it and use those instead of cloning the repositories. Primarily intended for CI environments that check out related branches.

Runtime

• SOURCEKITLSP_LOG_LEVEL: When using NonDarwinLogger, specify the level at which messages should be logged. Defaults to default. Use debug to increase to the highest log level.
• SOURCEKITLSP_LOG_PRIVACY_LEVEL: When using NonDarwinLogger, specifies whether information that might contain personal information (essentially source code) should be logged. Defaults to private, which logs this information. Set to public to redact this information.

Testing

• SKIP_LONG_TESTS: Skip tests that typically take more than 1s to execute.
• SOURCEKITLSP_KEEP_TEST_SCRATCH_DIR: Does not delete the temporary files created during test execution. Allows inspection of the test projects after the test finishes.
• SOURCEKIT_LSP_TEST_MODULE_CACHE: Specifies where tests should store their shared module cache. Defaults to writing the module cache to a temporary directory. Intended so that CI systems can clean the module cache directory after running.