@tangle/overwrite

@tangle/overwrite

see tests for examples.

API

Overwrite(opts) => overwrite

opts Object (optional) can have properties:

• identity
  • define the identity transformation for this strategy
  • default {}
• reifiedIdentity
  • define with reify(identity) resolves to
  • default null,
• valueSchema Object
  • add a JSON-schema to validate the values which are allowed to be passed in
  • default (see code, allows string / object / boolean / number)

overwrite.schema

overwrite.isValid

overwrite.identity() => I

overwrite.concat(R, S) => T

overwrite.mapFromInput(currentT, input) => T

overwrite.mapToOutput(T) => t

overwrite.isConflict(graph, nodeIds, field) => Boolean

where:

• graph is a @tangle/graph instance
• nodeIds is an Array of nodeIds you're wanting to check for conflict
• field String is the data field node.data[field] you're checking for conflicts

overwrite.isValidMerge(graph, nodeId, field) => Boolean

where:

• graph is a @tangle/graph instance
• nodeId is the id of the proposed merge-node
• field String is the data field node.data[field] you're checking for merge validity

overwrite.merge(graph, nodeId, field) => T

similar to isValidMerge, but return a transformation, T If it cannot, an error is thrown!

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Used with modules such as:

• @tangle/strategy
• ssb-crut