prism-typescript.js

(function (Prism) {

	Prism.languages.typescript = Prism.languages.extend('javascript', {
		'class-name': {
			pattern: /(\b(?:class|extends|implements|instanceof|interface|new|type)\s+)(?!keyof\b)(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*(?:\s*<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>)?/,
			lookbehind: true,
			greedy: true,
			inside: null // see below
		},
		'builtin': /\b(?:Array|Function|Promise|any|boolean|console|never|number|string|symbol|unknown)\b/,
	});

	// The keywords TypeScript adds to JavaScript
	Prism.languages.typescript.keyword.push(
		/\b(?:abstract|declare|is|keyof|readonly|require)\b/,
		// keywords that have to be followed by an identifier
		/\b(?:asserts|infer|interface|module|namespace|type)\b(?=\s*(?:[{_$a-zA-Z\xA0-\uFFFF]|$))/,
		// This is for `import type *, {}`
		/\btype\b(?=\s*(?:[\{*]|$))/
	);

	// doesn't work with TS because TS is too complex
	delete Prism.languages.typescript['parameter'];

	// a version of typescript specifically for highlighting types
	var typeInside = Prism.languages.extend('typescript', {});
	delete typeInside['class-name'];

	Prism.languages.typescript['class-name'].inside = typeInside;

	Prism.languages.insertBefore('typescript', 'function', {
		'decorator': {
			pattern: /@[$\w\xA0-\uFFFF]+/,
			inside: {
				'at': {
					pattern: /^@/,
					alias: 'operator'
				},
				'function': /^[\s\S]+/
			}
		},
		'generic-function': {
			// e.g. foo<T extends "bar" | "baz">( ...
			pattern: /#?(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*\s*<(?:[^<>]|<(?:[^<>]|<[^<>]*>)*>)*>(?=\s*\()/,
			greedy: true,
			inside: {
				'function': /^#?(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*/,
				'generic': {
					pattern: /<[\s\S]+/, // everything after the first <
					alias: 'class-name',
					inside: typeInside
				}
			}
		}
	});

	Prism.languages.ts = Prism.languages.typescript;

}(Prism));