method MemoryTable.prototype.createIndeximport { MemoryTable } from "https://deno.land/x/pg_mem@2.6.6/table.ts"; createIndex(t: _Transaction, expressions: CreateIndexDef): _IConstraint | nilcreateIndex(t: _Transaction,expressions: Name[],type: "primary" | "unique",indexName?: string | nil,): _IConstraintParameterst: _Transactionexpressions: CreateIndexDefReturns_IConstraint | nilParameterst: _Transactionexpressions: Name[]type: "primary" | "unique"optionalindexName: string | nilReturns_IConstraint