LebJS

A JavaScript engine written in Java

Common Usage

Run a file

lebjs [file]

Run the tests

lebjs -t [dir]

[dir] defaults to ./tests

Enter the REPL

lebjs

REPL commands

.help                      Display this message
.clear                     Clear the screen
.inspect [expression]      Deep print the result of [expression]

Flags

• -v, --verbose - Don't hide stack traces
• --parse-only - Ignore test failures from parsing
• --ignore-not-impl - Ignore test failures from unimplemented features
• --no-buffer - Do not buffer test outputs
• --hide-passing - Only output skipped / failing tests (ignored if --no-buffer specified)
• --disable-prompt - Disable the > prompt in the REPL
• --harness [value] - Test harness. Valid options: ladybird
• -t, --test - Run tests
• --gif - Enable GIF rendering mode (No error handling, no prompt, print delimiter after execution, print AST)