mirror of https://github.com/status-im/metro.git
[react-packager] Cache in-memory file lookups (~200ms win on file change)
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8faa406e96
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@ -11,6 +11,7 @@ const path = require('path');
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const readDir = Promise.promisify(fs.readdir);
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const readFile = Promise.promisify(fs.readFile);
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const stat = Promise.promisify(fs.stat);
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const hasOwn = Object.prototype.hasOwnProperty;
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class Fastfs extends EventEmitter {
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constructor(roots, fileWatcher, {ignore, pattern}) {
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@ -19,6 +20,7 @@ class Fastfs extends EventEmitter {
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this._ignore = ignore;
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this._pattern = pattern;
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this._roots = roots.map(root => new File(root, { isDir: true }));
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this._fastPaths = Object.create(null);
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}
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build() {
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@ -120,7 +122,12 @@ class Fastfs extends EventEmitter {
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}
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_getFile(filePath) {
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return this._getAndAssertRoot(filePath).getFileFromPath(filePath);
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filePath = path.normalize(filePath);
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if (!hasOwn.call(this._fastPaths, filePath)) {
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this._fastPaths[filePath] = this._getAndAssertRoot(filePath).getFileFromPath(filePath);
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}
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return this._fastPaths[filePath];
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}
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_add(file) {
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@ -161,7 +168,6 @@ class Fastfs extends EventEmitter {
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}
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// Make sure this event belongs to one of our roots.
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if (!this._getRoot(absPath)) {
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return;
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}
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@ -173,6 +179,8 @@ class Fastfs extends EventEmitter {
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}
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}
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delete this._fastPaths[path.normalize(absPath)];
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if (type !== 'delete') {
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this._add(new File(absPath, {
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isDir: false,
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