Current limitations

Currently, Lekko relies on a cross-language DSL with accurate mappings to each SDK language. For this reason, Lekko only supports validators in its intermediate DSL. For example:

def validate(url):
    assert.contains(url, "https")
 
export(
    Config(
        description = "lekko backend url",
        default = "http://backend.lekko.com", # Fails the https invariant
        overrides = [
            ("id == 3", "https://wayne.lekko.com"),
        ],
        validator = validate,
    ),
)

Supported assertions

• assert.eq(x, y) passes if x == y.
• assert.ne(x, y) passes if x != y.
• assert.lt(x, y) passes if x < y.
• assert.true(condition) is a logical check of the Boolean expression specified in condition.
• assert.contains(x, y) passes if x exists in y.
• assert.fail(message) fails with the error message specified in message.