[idyll] add type declaration for idyll (#25454)

* add type declaration for idyll

* incorrect export: expected a function export

types/idyll/idyll-tests.ts

@@ -0,0 +1,7 @@
+import idyll = require("idyll");
+
+// $ExpectType IdyllInstance
+idyll({
+    watch: true,
+    datasets: "."
+});

types/idyll/index.d.ts

@@ -0,0 +1,130 @@
+// Type definitions for idyll 2.10
+// Project: https://github.com/idyll-lang/idyll/tree/master/packages/idyll-cli
+// Definitions by: Thanh Ngo <https://github.com/iocat>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import { EventEmitter } from "events";
+import { Options as CompilerOptions } from "idyll-compiler";
+
+interface Options {
+    /**
+     * Monitor input files and rebuild on changes
+     */
+    watch?: boolean;
+    /**
+     * The datasets directory
+     */
+    datasets?: string;
+    /**
+     * Whether to minify output build
+     */
+    minify?: boolean;
+    /**
+     *
+     * Pre-render HTML as part of the build
+     */
+    ssr?: boolean;
+    /**
+     * The components directory
+     */
+    components?: boolean;
+    /**
+     * The default component directory
+     * This corresponds to where the idyll-components package stays
+     */
+    defaultComponents?: boolean;
+    /**
+     * The layout defined in idyll-layouts package
+     */
+    layout?: string;
+    /**
+     * The theme defined in idyll-theme package
+     */
+    theme?: string;
+    /**
+     * The output directory for compiled documents
+     */
+    output?: string;
+    /**
+     * Custom port to bind the local server to.
+     */
+    port?: number;
+    /**
+     * Temporary directory used by idyll
+     */
+    temp?: string;
+    /**
+     * path to HTML template
+     *
+     */
+    template?: string;
+
+    /**
+     * Custom CSS file to include in output
+     */
+    css?: string;
+    /**
+     * Custom browserify transforms to apply.
+     */
+    transform?: string[];
+    /**
+     * Compiler options
+     */
+    compiler?: CompilerOptions;
+    /**
+     * the idyll file to be compiled into
+     */
+    inputFile?: string;
+
+    /**
+     * used internally by IdyllInstance
+     */
+    inputConfig?: {
+        components: any;
+        transform: any[];
+        compiler: CompilerOptions;
+    };
+}
+
+type PredefinedFile =
+    | "APP_PATH"
+    | "CSS_INPUT_FILE"
+    | "DATA_DIR"
+    | "HTML_TEMPLATE_FILE"
+    | "IDYLL_INPUT_FILE"
+    | "INPUT_DIR"
+    | "PACKAGE_FILE"
+    | "OUTPUT_DIR"
+    | "TMP_DIR"
+    | "CSS_OUTPUT_FILE"
+    | "HTML_OUTPUT_FILE"
+    | "JS_OUTPUT_FILE";
+
+type ComponentFiles = "COMPONENT_DIRS" | "DEFAULT_COMPONENT_DIRS";
+
+type Paths = Record<PredefinedFile, string> & Record<ComponentFiles, string[]>;
+
+declare class IdyllInstance extends EventEmitter {
+    /**
+     * Returns internal paths used by idyll-cli
+     */
+    getPaths(): Paths;
+    /**
+     * Returns idyll compiling's options
+     */
+    getOptions(): Options;
+    /**
+     *
+     * if indexIdyllMarkup is provided, compiles it
+     *
+     * Otherwise, compiles and optionally watches
+     * the idyll file at IOptions.inputFile
+     *
+     */
+    build(indexIdyllMarkup?: string | null): this;
+}
+
+declare function idyll(options: Options, callback?: () => void): IdyllInstance;
+
+export = idyll;

types/idyll/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": ["es6"],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": ["../"],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "strictFunctionTypes": true
+    },
+    "files": ["index.d.ts", "idyll-tests.ts"]
+}

types/idyll/tslint.json

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+{
+    "extends": "dtslint/dt.json"
+}