Optional dependency of typescript. (#122)

Author: allex

src/index.ts

@@ -53,7 +53,6 @@ export default function typescript(options?: Partial<IOptions>)
 			exclude: ["*.d.ts", "**/*.d.ts"],
 			abortOnError: true,
 			rollupCommonJSResolveHack: false,
-			typescript: require("typescript"),
 			tsconfig: undefined,
 			useTsconfigDeclarationDir: false,
 			tsconfigOverride: {},
@@ -62,6 +61,10 @@ export default function typescript(options?: Partial<IOptions>)
 			objectHashIgnoreUnknownHack: false,
 		});
 
+	if (!pluginOptions.typescript) {
+		pluginOptions.typescript = require("typescript");
+	}
+
 	setTypescriptModule(pluginOptions.typescript);
 
 	return {