Method before

worker-configuration.d.ts:1217–1217

(content: string | ReadableStream | Response, options?: ContentOptions)

    readonly lastInTextNode: boolean;
    readonly removed: boolean;
    before(content: string | ReadableStream | Response, options?: ContentOptions): Text;
    after(content: string | ReadableStream | Response, options?: ContentOptions): Text;
    replace(content: string | ReadableStream | Response, options?: ContentOptions): Text;
    remove(): Text;