add CI pipeline with lint, test, build

node_modules/eslint/messages/shared.js

@@ -0,0 +1,23 @@
+/**
+ * @fileoverview Shared utilities for error messages.
+ * @author Josh Goldberg
+ */
+
+"use strict";
+
+/**
+ * Converts a value to a string that may be printed in errors.
+ * @param {any} value The invalid value.
+ * @param {number} indentation How many spaces to indent
+ * @returns {string} The value, stringified.
+ */
+function stringifyValueForError(value, indentation) {
+	return value
+		? JSON.stringify(value, null, 4).replace(
+				/\n/gu,
+				`\n${" ".repeat(indentation)}`,
+			)
+		: `${value}`;
+}
+
+module.exports = { stringifyValueForError };