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modules: add setter for module.parent #35522

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Oct 16, 2020
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modules: add setter for module.parent #35522

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2 changes: 1 addition & 1 deletion doc/api/modules.md
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Original file line number Diff line number Diff line change
Expand Up @@ -913,7 +913,7 @@ deprecated:

The module that first required this one, or `null` if the current module is the
entry point of the current process, or `undefined` if the module was loaded by
something that is not a CommonJS module (E.G.: REPL or `import`). Read only.
something that is not a CommonJS module (E.G.: REPL or `import`).

### `module.path`
<!-- YAML
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13 changes: 12 additions & 1 deletion lib/internal/modules/cjs/loader.js
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Expand Up @@ -223,13 +223,24 @@ ObjectDefineProperty(Module, 'wrapper', {
function getModuleParent() {
return moduleParentCache.get(this);
}

function setModuleParent(value) {
moduleParentCache.set(this, value);
}

ObjectDefineProperty(Module.prototype, 'parent', {
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moving this to be on the module itself is needed to make delete work

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Wouldn't that trigger a new deprecation warning for each Module instance?

module.parent; // triggers one warning
module.parent?.parent; // triggers another warning?

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No, because the deprecation uses a deprecation code:

node/lib/internal/util.js

Lines 77 to 82 in ce84bac

if (code !== undefined) {
if (!codesWarned.has(code)) {
process.emitWarning(msg, 'DeprecationWarning', code, deprecated);
codesWarned.add(code);
}
} else {

get: pendingDeprecation ? deprecate(
getModuleParent,
'module.parent is deprecated due to accuracy issues. Please use ' +
'require.main to find program entry point instead.',
'DEP0144'
) : getModuleParent
) : getModuleParent,
set: pendingDeprecation ? deprecate(
setModuleParent,
'module.parent is deprecated due to accuracy issues. Please use ' +
'require.main to find program entry point instead.',
'DEP0144'
) : setModuleParent,
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Make delete work:

Suggested change
) : setModuleParent,
) : setModuleParent,
configurable: true,

});

let debug = require('internal/util/debuglog').debuglog('module', (fn) => {
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13 changes: 13 additions & 0 deletions test/parallel/test-module-parent-setter-deprecation.js
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@@ -0,0 +1,13 @@
// Flags: --pending-deprecation

'use strict';
const common = require('../common');
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Suggested change
const common = require('../common');
const common = require('../common');
const assert = require('assert');


common.expectWarning(
'DeprecationWarning',
'module.parent is deprecated due to accuracy issues. Please use ' +
'require.main to find program entry point instead.',
'DEP0144'
);

module.parent = undefined;
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Suggested change
module.parent = undefined;
module.parent = undefined;
delete module.parent;
assert.strictEqual('parent' in module, false);