replace jest with ava

node_modules/ava/lib/code-excerpt.js

@@ -0,0 +1,54 @@
+'use strict';
+const fs = require('fs');
+const equalLength = require('equal-length');
+const codeExcerpt = require('code-excerpt');
+const truncate = require('cli-truncate');
+const chalk = require('./chalk').get();
+
+const formatLineNumber = (lineNumber, maxLineNumber) =>
+	' '.repeat(Math.max(0, String(maxLineNumber).length - String(lineNumber).length)) + lineNumber;
+
+module.exports = (source, options = {}) => {
+	if (!source.isWithinProject || source.isDependency) {
+		return null;
+	}
+
+	const {file, line} = source;
+	const maxWidth = options.maxWidth || 80;
+
+	let contents;
+	try {
+		contents = fs.readFileSync(file, 'utf8');
+	} catch (_) {
+		return null;
+	}
+
+	const excerpt = codeExcerpt(contents, line, {around: 1});
+	if (!excerpt) {
+		return null;
+	}
+
+	const lines = excerpt.map(item => ({
+		line: item.line,
+		value: truncate(item.value, maxWidth - String(line).length - 5)
+	}));
+
+	const joinedLines = lines.map(line => line.value).join('\n');
+	const extendedLines = equalLength(joinedLines).split('\n');
+
+	return lines
+		.map((item, index) => ({
+			line: item.line,
+			value: extendedLines[index]
+		}))
+		.map(item => {
+			const isErrorSource = item.line === line;
+
+			const lineNumber = formatLineNumber(item.line, line) + ':';
+			const coloredLineNumber = isErrorSource ? lineNumber : chalk.grey(lineNumber);
+			const result = ` ${coloredLineNumber} ${item.value}`;
+
+			return isErrorSource ? chalk.bgRed(result) : result;
+		})
+		.join('\n');
+};