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util,src: allow lookup of hidden values
This commit adds an internal util method that makes hidden values in the C++ layer visible in JS. PR-URL: nodejs#3988 Reviewed-By: Trevor Norris <trev.norris@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,32 @@ | ||
'use strict'; | ||
// Flags: --expose_internals | ||
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const common = require('../common'); | ||
const assert = require('assert'); | ||
const internalUtil = require('internal/util'); | ||
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function getHiddenValue(obj, name) { | ||
return function() { | ||
internalUtil.getHiddenValue(obj, name); | ||
}; | ||
} | ||
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assert.throws(getHiddenValue(), /obj must be an object/); | ||
assert.throws(getHiddenValue(null, 'foo'), /obj must be an object/); | ||
assert.throws(getHiddenValue(undefined, 'foo'), /obj must be an object/); | ||
assert.throws(getHiddenValue('bar', 'foo'), /obj must be an object/); | ||
assert.throws(getHiddenValue(85, 'foo'), /obj must be an object/); | ||
assert.throws(getHiddenValue({}), /name must be a string/); | ||
assert.throws(getHiddenValue({}, null), /name must be a string/); | ||
assert.throws(getHiddenValue({}, []), /name must be a string/); | ||
assert.deepEqual(internalUtil.getHiddenValue({}, 'foo'), undefined); | ||
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let arrowMessage; | ||
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try { | ||
require('../fixtures/syntax/bad_syntax'); | ||
} catch (err) { | ||
arrowMessage = internalUtil.getHiddenValue(err, 'arrowMessage'); | ||
} | ||
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assert(/bad_syntax\.js:1/.test(arrowMessage)); |