chore(typings): fix banner option

src/index.d.ts

@@ -24,6 +24,11 @@
 
 import type {Plugin} from 'rollup';
 
+type FilePath = string;
+type FileEncoding = string;
+type FactoryFn<T> = () => T;
+type Factory<T> = T | FactoryFn<T>;
+
 /**
  * A person, as described in NPM documentation.
  *
@@ -52,30 +57,49 @@ export interface Person {
  text: () => string;
 }
 
+/**
+ * @see {@link https://github.com/mjeanroy/rollup-plugin-license#comment-style}
+ */
 export type CommentStyle = 'regular' | 'ignored' | 'slash';
 
+/**
+ * Banner content descriptor.
+ */
 interface BannerContentOptions {
  /**
  * File to get banner content from.
  */
- file: string,
+ file: FilePath;
 
  /**
  * File encoding.
  * @default utf-8
  */
- encoding?: string,
+ encoding?: FileEncoding;
 }
 
+/**
+ * Banner content, can be:
+ * - A raw string, evaluated as a (lodash) template.
+ * - A file description, the content being read and evaluated as a (lodash) template.
+ */
 type BannerContent = string | BannerContentOptions;
 
+/**
+ * Data injected during banner "rendering" (i.e evaluated as template
+ * model).
+ */
+interface BannerContentData {
+ [key: string]: any;
+}
+
+/**
+ * Banner Options.
+ */
 interface BannerOptions {
- /**
- * @see {@link https://github.com/mjeanroy/rollup-plugin-license#comment-style}
- */
- commentStyle?: CommentStyle,
- content: BannerContent | (() => BannerContent),
- data?: { [key: string]: string } | (() => { [key: string]: string }),
+ content: Factory<BannerContent>;
+ commentStyle?: CommentStyle;
+ data?: Factory<BannerContentData>;
 }
 
 export type Banner = string | BannerOptions;
@@ -197,32 +221,32 @@ export type ThirdParty = ((dependencies: Dependency[]) => void) | {
  output: ThirdPartyOutput | ThirdPartyOutput[],
 };
 
-export type Options = {
- sourcemap?: boolean | string,
+export interface Options {
+ sourcemap?: boolean | string;
 
  /**
  * Debug mode
  * @default false
  */
- debug?: boolean,
+ debug?: boolean;
 
  /**
  * Current Working Directory
  * @default process.cwd()
  */
- cwd?: string,
+ cwd?: string;
 
  /**
  * License banner to place at the top of your bundle
  */
- banner?: Banner,
+ banner?: Factory<Banner>;
 
  /**
  * For third party dependencies.
  * Creates a file containing a summary of all dependencies can be generated
  * automatically
  */
- thirdParty?: ThirdParty,
+ thirdParty?: ThirdParty;
 }
 
 declare function rollupPluginLicense(options: Options): Plugin;