List of all 5 AWS partitions (AWS, AWS-cn, AWS-us-gov, AWS-ISO, AWS-ISO-b)

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	import { RegionInfo, RegionInfoProvider } from "@aws-sdk/types";
	// Partition default templates
	const AWS_TEMPLATE = "cloudfront.{region}.amazonaws.com";
	const AWS_CN_TEMPLATE = "cloudfront.{region}.amazonaws.com.cn";
	const AWS_ISO_TEMPLATE = "cloudfront.{region}.c2s.ic.gov";
	const AWS_ISO_B_TEMPLATE = "cloudfront.{region}.sc2s.sgov.gov";
	const AWS_US_GOV_TEMPLATE = "cloudfront.{region}.amazonaws.com";
	// Partition regions
	const AWS_REGIONS = new Set([
	"ap-south-1",
	"eu-north-1",
	"eu-west-3",
	"eu-west-2",
	"eu-west-1",
	"ap-northeast-2",
	"ap-northeast-1",
	"me-south-1",
	"ca-central-1",
	"sa-east-1",
	"ap-east-1",
	"ap-southeast-1",
	"ap-southeast-2",
	"eu-central-1",
	"us-east-1",
	"us-east-2",
	"us-west-1",
	"us-west-2"
	]);
	const AWS_CN_REGIONS = new Set(["cn-north-1", "cn-northwest-1"]);
	const AWS_ISO_REGIONS = new Set(["us-iso-east-1"]);
	const AWS_ISO_B_REGIONS = new Set(["us-isob-east-1"]);
	const AWS_US_GOV_REGIONS = new Set(["us-gov-west-1", "us-gov-east-1"]);
	export const defaultRegionInfoProvider: RegionInfoProvider = (
	region: string,
	options?: any
	) => {
	let regionInfo: RegionInfo | undefined = undefined;
	switch (region) {
	// First, try to match exact region names.
	case "aws-cn-global":
	regionInfo = {
	hostname: "cloudfront.cn-northwest-1.amazonaws.com.cn",
	signingRegion: "cn-northwest-1"
	};
	break;
	case "aws-global":
	regionInfo = {
	hostname: "cloudfront.amazonaws.com",
	signingRegion: "us-east-1"
	};
	break;
	// Next, try to match partition endpoints.
	default:
	if (AWS_REGIONS.has(region)) {
	return defaultRegionInfoProvider("aws-global");
	}
	if (AWS_CN_REGIONS.has(region)) {
	return defaultRegionInfoProvider("aws-cn-global");
	}
	if (AWS_ISO_REGIONS.has(region)) {
	regionInfo = {
	hostname: AWS_ISO_TEMPLATE.replace("{region}", region)
	};
	}
	if (AWS_ISO_B_REGIONS.has(region)) {
	regionInfo = {
	hostname: AWS_ISO_B_TEMPLATE.replace("{region}", region)
	};
	}
	if (AWS_US_GOV_REGIONS.has(region)) {
	regionInfo = {
	hostname: AWS_US_GOV_TEMPLATE.replace("{region}", region)
	};
	}
	// Finally, assume it's an AWS partition endpoint.
	if (regionInfo === undefined) {
	return defaultRegionInfoProvider("aws-global");
	}
	}
	return Promise.resolve(regionInfo);
	};

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