Add --output option to configure output file about create-index

[kvedantmahajan]

@dijs Please do this soon. Traffic is coming from gregberge/svgr#189

+1 for this index.ts naming.

While doing this you may not want to append .tsx or ts in the generated import statements of file i.e.

export { default as Announcement } from './Announcement.tsx';

as it makes tslint unhappy.

[kvedantmahajan]

Here, I have written a tiny nodejs script to achieve the same after create-index generates an index.js ( I have a Typescript project ).
Basically I had to replace .tsx from all import statements in index.js. Second, I had to rename it to index.ts.

const path = require("path");
const fs = require("fs");

const filePath = path.join("src", "icons");
const fileName = "index.js";

fs.readFile(`${filePath}/${fileName}`, "utf8", (err, data) => {
	if (err) throw err;
	const newStr = data.replace(/.tsx/g, "");
	fs.writeFile(`${filePath}/${fileName}`, newStr, writeErr => {
		if (writeErr) throw err;
		fs.rename(`${filePath}/${fileName}`, `${filePath}/index.ts`, renameErr => {
			if (renameErr) throw renameErr;
			console.log("rename completed");
		});
	});
});

package.json scripts as follows:

"build-icons": "rm -rf src/icons && npx @svgr/cli -d src/icons svg-icons --ext tsx",
"create-index": "npx create-index src/icons --extensions tsx",
"recreate-index": "node scripts/regenerate-icon-index.js",
"lint:icons": "eslint './src/icons/*.{ts,tsx}' --fix",
"generate-icons": "yarn run build-icons && yarn run create-index && yarn run recreate-index && yarn run lint:icons"

[dijs]

I would also like to change the output directory. I may work on this.