replace jest with ava

node_modules/ava/lib/reporters/format-serialized-error.js

@@ -0,0 +1,27 @@
+'use strict';
+const trimOffNewlines = require('trim-off-newlines');
+const chalk = require('../chalk').get();
+
+function formatSerializedError(error) {
+	const printMessage = error.values.length === 0 ?
+		Boolean(error.message) :
+		!error.values[0].label.startsWith(error.message);
+
+	if (error.statements.length === 0 && error.values.length === 0) {
+		return {formatted: null, printMessage};
+	}
+
+	let formatted = '';
+	for (const value of error.values) {
+		formatted += `${value.label}\n\n${trimOffNewlines(value.formatted)}\n\n`;
+	}
+
+	for (const statement of error.statements) {
+		formatted += `${statement[0]}\n${chalk.grey('=>')} ${trimOffNewlines(statement[1])}\n\n`;
+	}
+
+	formatted = trimOffNewlines(formatted);
+	return {formatted, printMessage};
+}
+
+module.exports = formatSerializedError;