uniqueItemProperties.ts
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uniqueItemProperties.ts
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			import type {FuncKeywordDefinition, AnySchemaObject} from "ajv"
			import equal = require("fast-deep-equal")

			const SCALAR_TYPES = ["number", "integer", "string", "boolean", "null"]

			export default function getDef(): FuncKeywordDefinition {
			return {
			keyword: "uniqueItemProperties",
			type: "array",
			schemaType: "array",
			compile(keys: string[], parentSchema: AnySchemaObject) {
			const scalar = getScalarKeys(keys, parentSchema)

			return (data) => {
			if (data.length <= 1) return true
			for (let k = 0; k < keys.length; k++) {
			const key = keys[k]
			if (scalar[k]) {
			const hash: Record<string, any> = {}
			for (const x of data) {
			if (!x \|\| typeof x != "object") continue
			let p = x[key]
			if (p && typeof p == "object") continue
			if (typeof p == "string") p = '"' + p
			if (hash[p]) return false
			hash[p] = true
			}
			} else {
			for (let i = data.length; i--; ) {
			const x = data[i]
			if (!x \|\| typeof x != "object") continue
			for (let j = i; j--; ) {
			const y = data[j]
			if (y && typeof y == "object" && equal(x[key], y[key])) return false
			}
			}
			}
			}
			return true
			}
			},
			metaSchema: {
			type: "array",
			items: {type: "string"},
			},
			}
			}

			function getScalarKeys(keys: string[], schema: AnySchemaObject): boolean[] {
			return keys.map((key) => {
			const t = schema.items?.properties?.[key]?.type
			return Array.isArray(t)
			? !t.includes("object") && !t.includes("array")
			: SCALAR_TYPES.includes(t)
			})
			}

			module.exports = getDef