Generate index.d.ts when build (#269)

.gitignore

@@ -10,3 +10,4 @@ stash
 coverage
 stats
 *.log
+index.d.ts

package.json

@@ -18,10 +18,11 @@
   "sideEffects": false,
   "scripts": {
     "start": "babel-watch --watch src",
-    "clean": "rimraf dist && rimraf build",
+    "clean": "rimraf dist && rimraf build && rimraf index.d.ts",
-    "build": "yarn clean && yarn build:move && yarn build:icons && yarn build:es && yarn build:bundles",
+    "build": "yarn clean && yarn build:move && yarn build:icons && yarn build:dts && yarn build:es && yarn build:bundles",
     "build:move": "cp -av src build",
     "build:icons": "npx babel-node ./scripts/buildIcons.js --presets @babel/env",
+    "build:dts": "npx babel-node ./scripts/buildDts.js --presets @babel/env",
     "build:es": "babel build -d dist/esm",
     "build:bundles": "rollup -c rollup.config.js",
     "optimize": "npx babel-node ./scripts/optimizeSvgs.js --presets @babel/env",

scripts/buildDts.js

@@ -0,0 +1,35 @@
+import path from 'path';
+
+import { readSvgDirectory, resetFile, appendFile, toPascalCase } from './helpers';
+
+const ICONS_DIR = path.resolve(__dirname, '../icons');
+const DTS_FILE_NAME = 'index.d.ts';
+const DTS_FILE_ROOT = path.resolve(__dirname, '../');
+
+resetFile(DTS_FILE_NAME, DTS_FILE_ROOT);
+
+// Generates header of d.ts file include some types and functions
+appendFile(
+  `
+export type IconData = readonly [string, object, IconData?];
+export type IconString = string;
+
+export function createElement(ico: IconData): SVGSVGElement;
+
+export declare const icons: { [key: string]: IconData };
+
+// Generated icons
+`,
+  DTS_FILE_NAME,
+  DTS_FILE_ROOT,
+);
+
+const svgFiles = readSvgDirectory(ICONS_DIR);
+
+svgFiles.forEach(svgFile => {
+  const nameSvg = path.basename(svgFile, '.svg');
+  const namePascal = toPascalCase(nameSvg);
+  appendFile(`export declare const ${namePascal}: IconData;\n`, DTS_FILE_NAME, DTS_FILE_ROOT);
+});
+
+console.log(`Successfully generated '${DTS_FILE_NAME}'.`);