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lang.toml

lang.toml is the Lang project manifest. It provides the project root, default entry file, and default runtime settings for CLI execution.

Schema

[project]
root = "."
entry = "main.lang"

[run]
transpiler = "python"

Rules

  • The file name is exactly lang.toml.
  • project.root is resolved relative to the directory containing lang.toml.
  • project.entry is resolved relative to the resolved project.root.
  • run.transpiler is optional in v1. The default is python.
  • lang run with no file uses project.entry.
  • Running the executable with no subcommand also uses project.entry.
  • CLI flags override manifest values.

Notes

  • lang.toml is optional. Explicit file execution still works without it.
  • In v1, the manifest is a project runner config, not a dependency or package manifest.
  • Absolute module imports work without --project-root when lang.toml supplies the project root.