dagster._core.errors.DagsterInvalidDefinitionError: resource with key 'slack' required by op 'slack_op' was not provided. Please provide a <class 'dagster._core.definitions.resource_definition.ResourceDefinition'> to key 'slack', or change the required key to one of the following keys which points to an <class 'dagster._core.definitions.resource_definition.ResourceDefinition'>: ['io_manager']

@op(required_resource_keys={'slack'})
def slack_op(context, msg=':wave: hey there!'):
    context.resources.slack.chat_postMessage(channel=SLACK_PIPELINE_CHANNEL, text=msg)

@graph
def my_graph():
    ...
    slack_op(...)

def failure_message_fn(context: RunFailureSensorContext) -> str:
    return (
        f"Job {context.pipeline_run.pipeline_name} failed!"
        f"Error: {context.failure_event.message}"
    )


slack_on_run_failure = make_slack_on_run_failure_sensor(
    channel=SLACK_ALERTS_CHANNEL,
    slack_token=SLACK_TOKEN,
    text_fn=failure_message_fn
)

update_job = my_graph.to_job(name="update_job",
                             resource_defs={'slack': slack_resource},
                             config={'resources': {'slack': {'config': {'token': SLACK_TOKEN}}}})

defs = Definitions(
    schedules=[...],
    sensors=[slack_on_run_failure],
    jobs=[...],
    resources={"slack": slack_resource}
)

foo_job

from dagster import Definitions
from dagster._core.definitions.decorators.graph_decorator import graph
from dagster._core.definitions.decorators.op_decorator import op
from dagster._core.definitions.resource_definition import ResourceDefinition

foo_resource = ResourceDefinition.hardcoded_resource("foo")

@op(required_resource_keys={"foo_resource"})
def foo_op(context):
    return context.resources.foo_resource

@graph
def foo_graph():
    foo_op()

foo_job = foo_graph.to_job(resource_defs={"foo_resource": foo_resource})

defs = Definitions(
    jobs=[foo_job],
    resources={"foo_resource": foo_resource},
)

{"slack": slack_resource}