[typescript-angular] special characters like $ are removed from var names

When generating TS client from a swagger spec, special characters (like $) are removed. This is caused by variable name sanitization.

This problem didn't exist in 2.2.3 and appeared since commit e70bdf17f21fcf0315d03d0846f6c47c818bd43e(caused by call to sanitizeName method)

Sanitization should depend on target language, as allowed characters in variable names are language dependant.

Spec example :

definitions: {
	Hateoas.Link: {
		type: "object",
		properties: {
			rel: {
				type: "string"
			},
			verb: {
				type: "string"
			},
			href: {
				type: "string"
			},
			title: {
				type: "string"
			}
		}
	},
	Hateoas.Resource: {
		required: [
			"$type"
		],
		type: "object",
		properties: {
			links: {
				type: "array",
				items: {
					$ref: "#/definitions/Hateoas.Link"
				}
			},
			$type: {
				type: "string"
			}
		},
		discriminator: "$type"
	},
}

In TS file :

export interface HateoasResource {
    links?: Array<HateoasLink>;
    type: string;
}

Should be something like :

export interface HateoasResource {
    links?: Array<HateoasLink>;
    $type: string;
}

Suggestion :
Make function sanitizeName (in DefaultCodegen.java) virtual and override it in AbstractTypeScriptClientCodegen.java removing (or correcting) name = name.replaceAll("\\W", "");

Thanks for your work

Read sanitizeName in DefaultCodegen.java and its suggested TypeScript override point in AbstractTypeScriptClientCodegen.java. Reproduce issue 7484 with the shown Hateoas.Resource specification, then verify that generated TypeScript preserves the $type property name while remaining valid.