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node_modules/verror/examples/levels-verror.js

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+var extsprintf = require('extsprintf');
+var fs = require('fs');
+var verror = require('../lib/verror');
+
+function checkFile(filename, callback) {
+	fs.stat(filename, function (err) {
+		if (err)
+			/* Annotate the "stat" error with what we were doing. */
+			return (callback(new verror.VError(err,
+			    'failed to check "%s"', filename)));
+
+		/* ... */
+		return (callback());
+	});
+}
+
+function handleRequest(filename, callback) {
+	checkFile('/nonexistent', function (err) {
+		if (err)
+			/* Annotate the "checkFile" error. */
+			return (callback(new verror.VError(
+			    err, 'request failed')));
+
+		/* ... */
+		return (callback());
+	});
+}
+
+handleRequest('/nonexistent', function (err) {
+	if (err) {
+		console.log(err.message);
+		console.log(extsprintf.sprintf('%r', err));
+	}
+
+    /* ... */
+});

node_modules/verror/examples/levels-werror.js

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+var extsprintf = require('extsprintf');
+var fs = require('fs');
+var verror = require('../lib/verror');
+
+function checkFile(filename, callback) {
+	fs.stat(filename, function (err) {
+		if (err)
+			/* Annotate the "stat" error with what we were doing. */
+			return (callback(new verror.VError(err,
+			    'failed to check "%s"', filename)));
+
+		/* ... */
+		return (callback());
+	});
+}
+
+function handleRequest(filename, callback) {
+	checkFile('/nonexistent', function (err) {
+		if (err)
+			/* Wrap the "checkFile" error. */
+			return (callback(new verror.WError(
+			    err, 'request failed')));
+
+		/* ... */
+		return (callback());
+	});
+}
+
+handleRequest('/nonexistent', function (err) {
+	if (err) {
+		console.log(err.message);
+		console.log(err.toString());
+	}
+});

node_modules/verror/examples/varargs.js

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+var verror = require('../lib/verror');
+
+var opname = 'read';
+var err = new verror.VError('"%s" operation failed', opname);
+console.log(err.message);
+console.log(err.stack);

node_modules/verror/examples/verror.js

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+var mod_fs = require('fs');
+var mod_verror = require('../lib/verror');
+
+var filename = '/nonexistent';
+
+mod_fs.stat(filename, function (err1) {
+	var err2 = new mod_verror.VError(err1, 'failed to stat "%s"', filename);
+
+	/* The following would normally be higher up the stack. */
+	var err3 = new mod_verror.VError(err2, 'failed to handle request');
+	console.log(err3.message);
+	console.log(err3.stack);
+});

node_modules/verror/examples/werror.js

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+var mod_fs = require('fs');
+var mod_verror = require('../lib/verror');
+
+var filename = '/nonexistent';
+
+mod_fs.stat(filename, function (err1) {
+	var err2 = new mod_verror.WError(err1, 'failed to stat "%s"', filename);
+
+	/* The following would normally be higher up the stack. */
+	var err3 = new mod_verror.WError(err2, 'failed to handle request');
+	console.log(err3.message);
+	console.log(err3.toString());
+	console.log(err3.stack);
+});