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Avoid losing deltas when unexpected errors happen on the DeltaTransformer 

Reviewed By: jeanlauliac

Differential Revision: D6402261

fbshipit-source-id: 6a1a18c1bd7d4f7cecd5a5e9114f6eb493d40b4d
This commit is contained in:
Rafael Oleza 2017-11-23 08:05:35 -08:00 committed by Facebook Github Bot
parent 70dadc63f9
commit 6557272f8c
2 changed files with 44 additions and 29 deletions
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4
packages/metro-bundler/src/DeltaBundler/DeltaCalculator.js
View File

@ -74,6 +74,10 @@ class DeltaCalculator extends EventEmitter {
.getWatcher() .getWatcher()
.removeListener('change', this._handleMultipleFileChanges); .removeListener('change', this._handleMultipleFileChanges);
this.reset();
}
reset() {
// Clean up all the cache data structures to deallocate memory. // Clean up all the cache data structures to deallocate memory.
this._modifiedFiles = new Set(); this._modifiedFiles = new Set();
this._deletedFiles = new Set(); this._deletedFiles = new Set();

11
packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
View File

@ -230,6 +230,7 @@ class DeltaTransformer extends EventEmitter {
const transformerOptions = await this._deltaCalculator.getTransformerOptions(); const transformerOptions = await this._deltaCalculator.getTransformerOptions();
const dependencyEdges = this._deltaCalculator.getDependencyEdges(); const dependencyEdges = this._deltaCalculator.getDependencyEdges();
try {
// Return the source code that gets prepended to all the modules. This // Return the source code that gets prepended to all the modules. This
// contains polyfills and startup code (like the require() implementation). // contains polyfills and startup code (like the require() implementation).
const prependSources = reset const prependSources = reset
@ -264,6 +265,16 @@ class DeltaTransformer extends EventEmitter {
delta: modifiedDelta, delta: modifiedDelta,
reset, reset,
}; };
} catch (e) {
// If any unexpected error happens while creating the bundle, the client
// is going to lose that specific delta, while the DeltaCalulator has
// already processed the changes. This will make that change to be lost,
// which can cause the final bundle to be invalid. In order to avoid that,
// we just reset the delta calculator when this happens.
this._deltaCalculator.reset();
throw e;
}
} }
_getDependencies = (path: string): Set<string> => { _getDependencies = (path: string): Set<string> => {