My TypeScript snippets for VS Code

typescript.json

{
	"Create a nominal type": {
		"prefix": "nominal",
		"body": "type $1 = Nominal<$0, '$1'>;",
		"description": "Creates a nominal type."
	},
	"Define the base Nominal type": {
		"prefix": "basenominal",
		"body": [
			"class Tagged<T> { #secret_tag: T }",
			"type Nominal<Type, Tag> = Type & Tagged<Tag>;"
		],
		"description": "Creates the base Nominal type that will be used to create other types from it."
	},
	"Create a branded type": {
		"prefix": "branded",
		"body": [
			"type $1 = {",
			"\t_brand: '_$1';",
			"\t$0;",
			"};"
		]
	},
	"Create a constrained type": {
		"prefix": "constrained",
		"body": [
			"interface $1 {",
			"\treadonly _tag: '$1'",
			"\tcreate(value: $0): $1",
			"\tvalue(val: $1): $0",
			"}",
			"",
			"class $1 implements $1 {",
			"\tprivate internalValue: $0;",
			"",
			"\tprivate constructor(value: $0) {",
			"\t\tthis.internalValue = value;",
			"\t}",
			"",
			"\tstatic create(value: $0): $1 {",
			"\t\treturn new $1(value);",
			"\t}",
			"",
			"\tstatic value(val: $1) {",
			"\t\treturn val.internalValue",
			"\t}",
			"};"
		]
	}
}

Some nice ideas taken from https://learnfromit.co/functionaltypescript/2020/03/26/domain-modeling-made-functional-with.html but I need to experiment more

I use Rescript now, forget about tS