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fix(bazel): improve performance of tsHost.writeFile() (#34331)

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Removing from an array incurs O(n^2) cost, and could be mitigated with the use of a Set instead.

PR Close #34331
This commit is contained in:
Keen Yee Liau 2019-12-10 10:24:48 -08:00 committed by Andrew Kushnir
parent 8572911e94
commit 08ea38f197
2 changed files with 9 additions and 7 deletions
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13
packages/bazel/src/ngc-wrapped/index.ts
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@ -199,16 +199,15 @@ export function compile({allDepsCompiledWithBazel = true, compilerOpts, tsHost,
throw new Error(`Couldn't find bazel bin in the rootDirs: ${compilerOpts.rootDirs}`); throw new Error(`Couldn't find bazel bin in the rootDirs: ${compilerOpts.rootDirs}`);
} }
const writtenExpectedOuts = expectedOuts.map(p => p.replace(/\\/g, '/')); const expectedOutsSet = new Set(expectedOuts.map(p => p.replace(/\\/g, '/')));
const originalWriteFile = tsHost.writeFile.bind(tsHost); const originalWriteFile = tsHost.writeFile.bind(tsHost);
tsHost.writeFile = tsHost.writeFile =
(fileName: string, content: string, writeByteOrderMark: boolean, (fileName: string, content: string, writeByteOrderMark: boolean,
onError?: (message: string) => void, sourceFiles?: ts.SourceFile[]) => { onError?: (message: string) => void, sourceFiles?: ts.SourceFile[]) => {
const relative = relativeToRootDirs(fileName.replace(/\\/g, '/'), [compilerOpts.rootDir]); const relative = relativeToRootDirs(fileName.replace(/\\/g, '/'), [compilerOpts.rootDir]);
const expectedIdx = writtenExpectedOuts.findIndex(o => o === relative); if (expectedOutsSet.has(relative)) {
if (expectedIdx >= 0) { expectedOutsSet.delete(relative);
writtenExpectedOuts.splice(expectedIdx, 1);
originalWriteFile(fileName, content, writeByteOrderMark, onError, sourceFiles); originalWriteFile(fileName, content, writeByteOrderMark, onError, sourceFiles);
} }
}; };
@ -425,8 +424,10 @@ export function compile({allDepsCompiledWithBazel = true, compilerOpts, tsHost,
fs.writeFileSync(bazelOpts.tsickleExternsPath, externs); fs.writeFileSync(bazelOpts.tsickleExternsPath, externs);
} }
for (let i = 0; i < writtenExpectedOuts.length; i++) { // There might be some expected output files that are not written by the
originalWriteFile(writtenExpectedOuts[i], '', false); // compiler. In this case, just write an empty file.
for (const fileName of expectedOutsSet) {
originalWriteFile(fileName, '', false);
} }
return {program, diagnostics}; return {program, diagnostics};

3
packages/bazel/src/ngc-wrapped/tsconfig.json
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@ -1,6 +1,7 @@
{ {
"compilerOptions": { "compilerOptions": {
"lib": ["es5", "es2015.collection", "es2015.core"], "lib": ["es5", "es2015.collection", "es2015.core"],
"types": ["node"] "types": ["node"],
"downlevelIteration": true
} }
} }