ts-morph

Type Aliases

Type aliases can be retrieved from source files, namespaces, or function bodies:

const typeAliases = sourceFile.getTypeAliases();
const typeAlias = sourceFile.getTypeAlias("TypeAlias");
const firstExportedTypeAlias = sourceFile.getTypeAlias(a => a.hasExportKeyword());

Most of the information you can get about type aliases is covered in other sections.

Add/Insert

Add or insert type aliases to a source file, namespace, or function like declarations by calling addTypeAlias(), addTypeAliases(), insertTypeAlias(), or insertTypeAliases().

const typeAliasDeclaration = sourceFile.addTypeAlias({
    name: "TypeAliasName",
    type: "string"
});

Remove

Call .remove():

typeAliasDeclaration.remove();