Initial commit

.gitignore

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+node_modules/

README.md

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+# ts-coverage
+
+When you migrate your project to TypeScript it's useful to track the progress.
+ts-coverage print simple histogram so you can always know how close to the goal you are.
+
+## Example
+
+`npx ts-coverage ./src`
+
+*Output*
+
+```
+.js(x) | ############################################################ | 1933 (97.9%)
+.ts(x) | #                                                            | 41 (2.1%)
+```

cli.js

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+const path = require('path');
+const lib = require('./lib');
+const { argv } = require('yargs')
+    .usage("$0 <path>");
+
+if (module.parent) throw new Error(`Can't be imported`);
+
+process.on('unhandledRejection', error => {
+    throw error;
+});
+
+const [dir] = argv._;
+
+lib(dir);

index.js

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+module.exports = require('./lib');

lib.js

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+const path = require('path');
+const fs = require('fs').promises;
+const globby = require('globby');
+const chalk = require('chalk');
+const histogram = require('ascii-histogram');
+
+const percent = (n, total) => (n && (n / total * 100).toFixed(1)) + '%';
+
+const formatter = total => n => `${n} (${percent(n, total)})`;
+
+const printOutput = data => {
+	const total = Object.values(data)
+		.reduce((acc, v) => acc + v, 0);
+
+	const output = histogram(data, { map: formatter(total) })
+		.split('\n')
+		.map((v, i) => {
+			switch (i) {
+				case 0:
+					return chalk.yellowBright(v);
+				case 1:
+					return chalk.blueBright(v);
+				default:
+					return v;
+			}
+		})
+		.join('\n');
+
+	console.log(total
+		? output
+		: 'No sources found ¯\\_(ツ)_/¯.'
+	);
+};
+
+/**
+ * @param {string} directory 
+ */
+module.exports = async (directory = process.cwd()) => {
+	const extensions = {};
+
+	directory = path.resolve(directory);
+
+	await fs.access(directory);
+
+	for await (const p of globby.stream(`${directory}/**/*.{js,jsx,ts,tsx}`)) {
+		const extension = path.extname(p);
+		extensions[extension] = (extensions[extension] || 0) + 1;
+	}
+
+	const jsx = extensions['.js'] + extensions['.jsx'];
+	const tsx = extensions['.ts'] + extensions['.tsx'];
+
+	const data = {
+		'.js(x)': jsx || 0,
+		'.ts(x)': tsx || 0,
+	};
+
+	printOutput(data);
+};