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modules: significantly improve require performance #25362

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bbfe4a3
benchmark: add new module loading benchmarks
BridgeAR Jan 2, 2019
9c54e43
modules: significantly improve repeated requires
BridgeAR Dec 30, 2018
23eee46
fixup: changed signature on master
BridgeAR Jan 6, 2019
ab5d408
fixup: add line back
BridgeAR Jan 6, 2019
f447111
fixup: typo
BridgeAR Jan 6, 2019
fc0493a
fixup: remove minor breaking change
BridgeAR Jan 6, 2019
e625fb8
fixup: remove obsolete internals check
BridgeAR Jan 6, 2019
c7a9751
fixup: add backwards compat fix
BridgeAR Jan 6, 2019
d8aca04
fixup: address long sentence
BridgeAR Jan 6, 2019
5de8e71
fixup: check internal modules first
BridgeAR Jan 6, 2019
ba9c391
fixup: try using an own object
BridgeAR Jan 6, 2019
34a1785
fixup: smaller code
BridgeAR Jan 6, 2019
554c5ac
fixup: faster internal check
BridgeAR Jan 6, 2019
38afefb
fixup: make sure extension symbols are ignored
BridgeAR Jan 6, 2019
7194285
fixup: keep backwards compatible return value
BridgeAR Jan 6, 2019
59116ac
fixup: improve benchmarks
BridgeAR Jan 6, 2019
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fixup: make sure extension symbols are ignored
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@BridgeAR
BridgeAR committed Jan 6, 2019
commit 38afefbbcaad8b987f38b1e746d7216d65bb11d0
6 changes: 3 additions & 3 deletions lib/internal/modules/cjs/loader.js
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Original file line number Diff line number Diff line change
Expand Up @@ -738,14 +738,14 @@ function setExtensionsProxy(extensions) {
}
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@jdalton jdalton Jan 8, 2019

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It seems like an awful lot of work for to avoid Object.keys here.
How much is the win here for just Object.keys? Can we leave this whole Proxy of the Module out and still get the majority of the wins?

return new Proxy(extensions, {
set(obj, prop, value) {
if (extensionCopy[prop] === undefined) {
if (typeof prop !== 'symbol' && extensionCopy[prop] === undefined) {
extensionCopy[prop] = true;
extensionNames.push(prop);
}
return Reflect.set(obj, prop, value);
},
defineProperty(target, prop, descriptor) {
if (extensionCopy[prop] === undefined) {
if (typeof prop !== 'symbol' && extensionCopy[prop] === undefined) {
extensionCopy[prop] = true;
extensionNames.push(prop);
}
Expand All @@ -754,7 +754,7 @@ function setExtensionsProxy(extensions) {
deleteProperty(target, prop) {
const pos = extensionNames.indexOf(prop);
if (pos !== -1) {
extensionCopy[prop] = false;
delete extensionCopy[prop];
extensionNames.splice(pos, 1);
}
return Reflect.deleteProperty(target, prop);
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2 changes: 2 additions & 0 deletions test/parallel/test-module-multi-extensions.js
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Expand Up @@ -18,6 +18,8 @@ fs.writeFileSync(dotfile, 'console.log(__filename);', 'utf8');
fs.writeFileSync(dotfileWithExtension, 'console.log(__filename);', 'utf8');

{
// The Symbol should be ignored.
require.extensions[Symbol()] = common.mustNotCall();
require.extensions['.bar'] = common.mustNotCall();
require.extensions['.foo.bar'] = common.mustCall();
const modulePath = path.join(tmpdir.path, 'test-extensions');
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