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repl: indicate if errors are thrown or not
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Currently an error is printed identical, no matter if it is just
inspected or if the error is thrown inside of the REPL. This makes
sure we are able to distinguish these cases.

PR-URL: #25253
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
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BridgeAR authored and MylesBorins committed May 16, 2019
1 parent 4155b74 commit b061a08
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Showing 8 changed files with 83 additions and 63 deletions.
7 changes: 5 additions & 2 deletions lib/repl.js
Original file line number Diff line number Diff line change
Expand Up @@ -436,15 +436,18 @@ function REPLServer(prompt,
}

if (errStack === '') {
errStack = `Thrown: ${util.inspect(e)}`;
errStack = `Thrown: ${util.inspect(e)}\n`;
} else {
const ln = errStack.endsWith('\n') ? '' : '\n';
errStack = `Thrown:\n${errStack}${ln}`;
}

if (!self.underscoreErrAssigned) {
self.lastError = e;
}

const top = replMap.get(self);
top.outputStream.write(`${errStack}\n`);
top.outputStream.write(errStack);
top.clearBufferedCommand();
top.lines.level = [];
top.displayPrompt();
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2 changes: 1 addition & 1 deletion test/parallel/test-repl-harmony.js
Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,7 @@ const child = spawn(process.execPath, args);
const input = '(function(){"use strict"; const y=1;y=2})()\n';
// This message will vary based on JavaScript engine, so don't check the message
// contents beyond confirming that the `Error` is a `TypeError`.
const expectOut = /^> TypeError: /;
const expectOut = /^> Thrown:\nTypeError: /;

child.stderr.setEncoding('utf8');
child.stderr.on('data', function(c) {
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13 changes: 7 additions & 6 deletions test/parallel/test-repl-pretty-custom-stack.js
Original file line number Diff line number Diff line change
Expand Up @@ -46,25 +46,26 @@ const tests = [
{
// test .load for a file that throws
command: `.load ${fixtures.path('repl-pretty-stack.js')}`,
expected: 'Error: Whoops!--->\nrepl:9:24--->\nd (repl:12:3)--->\nc ' +
'(repl:9:3)--->\nb (repl:6:3)--->\na (repl:3:3)\n'
expected: 'Thrown:\nError: Whoops!--->\nrepl:9:24--->\nd (repl:12:3)' +
'--->\nc (repl:9:3)--->\nb (repl:6:3)--->\na (repl:3:3)\n'
},
{
command: 'let x y;',
expected: 'let x y;\n ^\n\nSyntaxError: Unexpected identifier\n'
expected: 'Thrown:\n' +
'let x y;\n ^\n\nSyntaxError: Unexpected identifier\n'
},
{
command: 'throw new Error(\'Whoops!\')',
expected: 'Error: Whoops!\n'
expected: 'Thrown:\nError: Whoops!\n'
},
{
command: 'foo = bar;',
expected: 'ReferenceError: bar is not defined\n'
expected: 'Thrown:\nReferenceError: bar is not defined\n'
},
// test anonymous IIFE
{
command: '(function() { throw new Error(\'Whoops!\'); })()',
expected: 'Error: Whoops!--->\nrepl:1:21\n'
expected: 'Thrown:\nError: Whoops!--->\nrepl:1:21\n'
}
];

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14 changes: 8 additions & 6 deletions test/parallel/test-repl-pretty-stack.js
Original file line number Diff line number Diff line change
Expand Up @@ -31,25 +31,27 @@ const tests = [
{
// test .load for a file that throws
command: `.load ${fixtures.path('repl-pretty-stack.js')}`,
expected: 'Error: Whoops!\n at repl:9:24\n at d (repl:12:3)\n ' +
'at c (repl:9:3)\n at b (repl:6:3)\n at a (repl:3:3)\n'
expected: 'Thrown:\nError: Whoops!\n at repl:9:24\n' +
' at d (repl:12:3)\n at c (repl:9:3)\n' +
' at b (repl:6:3)\n at a (repl:3:3)\n'
},
{
command: 'let x y;',
expected: 'let x y;\n ^\n\nSyntaxError: Unexpected identifier\n\n'
expected: 'Thrown:\n' +
'let x y;\n ^\n\nSyntaxError: Unexpected identifier\n'
},
{
command: 'throw new Error(\'Whoops!\')',
expected: 'Error: Whoops!\n'
expected: 'Thrown:\nError: Whoops!\n'
},
{
command: 'foo = bar;',
expected: 'ReferenceError: bar is not defined\n'
expected: 'Thrown:\nReferenceError: bar is not defined\n'
},
// test anonymous IIFE
{
command: '(function() { throw new Error(\'Whoops!\'); })()',
expected: 'Error: Whoops!\n at repl:1:21\n'
expected: 'Thrown:\nError: Whoops!\n at repl:1:21\n'
}
];

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3 changes: 1 addition & 2 deletions test/parallel/test-repl-tab-complete-no-warn.js
Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,7 @@ const ArrayStream = require('../common/arraystream');
const repl = require('repl');
const DEFAULT_MAX_LISTENERS = require('events').defaultMaxListeners;

ArrayStream.prototype.write = () => {
};
ArrayStream.prototype.write = () => {};

const putIn = new ArrayStream();
const testMe = repl.start('', putIn);
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7 changes: 4 additions & 3 deletions test/parallel/test-repl-top-level-await.js
Original file line number Diff line number Diff line change
Expand Up @@ -118,15 +118,15 @@ async function ordinaryTests() {
[ 'if (await true) { function bar() {}; }', 'undefined' ],
[ 'bar', '[Function: bar]' ],
[ 'if (await true) { class Bar {}; }', 'undefined' ],
[ 'Bar', 'ReferenceError: Bar is not defined', { line: 0 } ],
[ 'Bar', 'ReferenceError: Bar is not defined', { line: 1 } ],
[ 'await 0; function* gen(){}', 'undefined' ],
[ 'for (var i = 0; i < 10; ++i) { await i; }', 'undefined' ],
[ 'i', '10' ],
[ 'for (let j = 0; j < 5; ++j) { await j; }', 'undefined' ],
[ 'j', 'ReferenceError: j is not defined', { line: 0 } ],
[ 'j', 'ReferenceError: j is not defined', { line: 1 } ],
[ 'gen', '[GeneratorFunction: gen]' ],
[ 'return 42; await 5;', 'SyntaxError: Illegal return statement',
{ line: 3 } ],
{ line: 4 } ],
[ 'let o = await 1, p', 'undefined' ],
[ 'p', 'undefined' ],
[ 'let q = 1, s = await 2', 'undefined' ],
Expand Down Expand Up @@ -160,6 +160,7 @@ async function ctrlCTest() {
{ ctrl: true, name: 'c' }
]), [
'await timeout(100000)\r',
'Thrown:',
'Error [ERR_SCRIPT_EXECUTION_INTERRUPTED]: ' +
'Script execution was interrupted by `SIGINT`.',
PROMPT
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4 changes: 4 additions & 0 deletions test/parallel/test-repl-underscore.js
Original file line number Diff line number Diff line change
Expand Up @@ -173,10 +173,12 @@ function testError() {
'undefined',

// The error, both from the original throw and the `_error` echo.
'Thrown:',
'Error: foo',
'[Error: foo]',

// The sync error, with individual property echoes
'Thrown:',
/^{ Error: ENOENT: no such file or directory, scandir '.*nonexistent.*'/,
/Object\.readdirSync/,
/^ errno: -(2|4058),$/,
Expand All @@ -191,6 +193,7 @@ function testError() {
'undefined',

// The message from the original throw
'Thrown:',
'Error: baz',
/setImmediate/,
/^ at/,
Expand Down Expand Up @@ -219,6 +222,7 @@ function testError() {
"'baz'",
'Expression assignment to _error now disabled.',
'0',
'Thrown:',
'Error: quux',
'0'
]);
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