Add extracted source directory and README navigation

extracted-source/node_modules/code-excerpt/dist/index.js

@@ -0,0 +1,27 @@
+import tabsToSpaces from 'convert-to-spaces';
+const generateLineNumbers = (line, around) => {
+    const lineNumbers = [];
+    const min = line - around;
+    const max = line + around;
+    for (let lineNumber = min; lineNumber <= max; lineNumber++) {
+        lineNumbers.push(lineNumber);
+    }
+    return lineNumbers;
+};
+const codeExcerpt = (source, line, options = {}) => {
+    var _a;
+    if (typeof source !== 'string') {
+        throw new TypeError('Source code is missing.');
+    }
+    if (!line || line < 1) {
+        throw new TypeError('Line number must start from `1`.');
+    }
+    const lines = tabsToSpaces(source).split(/\r?\n/);
+    if (line > lines.length) {
+        return;
+    }
+    return generateLineNumbers(line, (_a = options.around) !== null && _a !== void 0 ? _a : 3)
+        .filter(line => lines[line - 1] !== undefined)
+        .map(line => ({ line, value: lines[line - 1] }));
+};
+export default codeExcerpt;